Arch expansion appliance, design method for digital arch expansion appliance, forming method for arch expansion appliance, apparatus, electronic device, and storage medium

Abstract

Disclosed in the present invention are an arch expansion appliance, a design method for a digital arch expansion appliance, a forming method for an arch expansion appliance, an apparatus, an electronic device, and a storage medium. The arch expansion appliance comprises two tooth engagement units and an arch expansion unit connecting the two tooth engagement units. The arch expansion unit comprises an arch expansion unit body and at least one reinforcing rib connected to the arch expansion unit body, the arch expansion unit body comprising a first region and at least one second region distributed in the anterior-posterior direction, the at least one reinforcing rib being located in the second region and not located in the first region, or the at least one reinforcing rib being located in the first region and the second region, and the total rigidity of the reinforcing ribs in the first region being less than the total rigidity of the reinforcing ribs in the second region. In different application scenarios, the present invention can add different additional arch expansion forces to different regions of the arch expansion unit body according to different arch expansion force requirements.

Description

Bow expanders, design methods for digital bow expanders, molding methods for bow expanders, devices, electronic equipment and storage media Technical Field

[0001] This invention relates to the field of orthodontic technology, and in particular to an expander, a design method for a digital expander, a molding method for an expander, a device, an electronic device, and a storage medium. Background Technology

[0002] Arch expansion is a common orthodontic treatment for dental arch width discrepancies. For example, using an arch expander to help children widen the palatal suture can prevent dental crowding, guide mandibular protrusion, achieve skeletal correction, avoid tooth extraction, promote functional remodeling, be performed at the optimal time to obtain better bone effects, reduce side effects, serve as an early intervention, promote coordinated jawbone development, and improve occlusion. These measures help reduce the time and difficulty of subsequent orthodontic treatment and ensure the healthy development of the child's stomatognathic system.

[0003] With the continuous development of invisible orthodontic technology, it is of great significance to design invisible bow expanders with bow expansion function. However, the bow expansion effect of existing invisible bow expanders is not good. Summary of the Invention

[0004] The purpose of this invention is to provide a bow expander, a design method for a digital bow expander, a forming method for a bow expander, a device, an electronic device, and a storage medium, which helps to provide sufficient bow expanding force.

[0005] This invention provides an arch expander, comprising two dental engagement portions and an arch expander connecting the two dental engagement portions. The arch expander includes an arch expander body and at least one reinforcing rib connected to the arch expander body. The arch expander body includes a first region and at least one second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right No. 4 foramina of the two dental engagement portions, and the first rear edge line of the first region connects to the distal ends of the left and right No. 4 foramina. The second front edge line of the second region connects to the mesial ends of the left and right No. N foramina of the two dental engagement portions, and the second rear edge line of the second region connects to the distal ends of the left and right No. N foramina are No. 5 or No. 6 foramina.

[0006] At least one reinforcing rib is located in the second region and not in the first region, or at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

[0007] This invention provides an arch expander, including two dental engagement portions and an arch expander connecting the two dental engagement portions. The arch expander includes an arch expander body and at least one reinforcing rib connected to the arch expander body. The arch expander body includes a first region and a second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two dental engagement portions, and the first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two dental engagement portions, and the second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. Wherein, M and N are different positive integers.

[0008] When the expander is worn, there is a first maximum distance between the palatal tissue corresponding to the first region and the reference surface, and a second maximum distance between the palatal tissue corresponding to the second region and the reference surface. The first maximum distance is less than the second maximum distance. The reference surface is perpendicular to the vertical direction and passes through the junction area between the expander and the two tooth joints. At least one reinforcing rib is located in the second region and not in the first region, or at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

[0009] This invention provides an arch expander, including two dental engagement portions and an arch expander connecting the two dental engagement portions. The arch expander includes an arch expander body and at least one reinforcing rib connected to the arch expander body. The arch expander body includes a first region and a second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two dental engagement portions, and the first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two dental engagement portions, and the second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. Wherein, M and N are different positive integers.

[0010] The first region has a third maximum spacing with respect to the reference surface, and the second region has a fourth maximum spacing with respect to the reference surface. The third maximum spacing is less than the fourth maximum spacing. The reference surface is perpendicular to the vertical direction and passes through the junction area of ​​the arch expander and the two tooth joints. At least one reinforcing rib is located in the second region and not in the first region. Alternatively, at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

[0011] This invention provides an arch expander, comprising two dental engagement portions and an arch expander connecting the two dental engagement portions. The arch expander includes an arch expander body and at least one reinforcing rib connected to the arch expander body. The arch expander body includes a first region and a second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two dental engagement portions, and the first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two dental engagement portions, and the second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. At least one reinforcing rib is located in the first region and / or the second region. The arch expander includes a first arch expander corresponding to the first region and a second arch expander corresponding to the second region. The ratio of the total rigidity of the first arch expander to the total rigidity of the second arch expander is in the range of 1 / 2-2, where M and N are different positive integers.

[0012] This invention provides an arch expander, including two dental engagement portions and an arch expander connecting the two dental engagement portions. The arch expander includes an arch expander body and a plurality of reinforcing ribs connecting the arch expander body. The plurality of reinforcing ribs includes a first reinforcing rib and a second reinforcing rib distributed in a front-rear direction. The first reinforcing rib is located at the front end of the second reinforcing rib, and the total rigidity of the first reinforcing rib is less than the total rigidity of the second reinforcing rib.

[0013] This invention provides an arch expander, including two dental engagement portions and an arch expander portion connecting the two dental engagement portions. The arch expander portion includes an arch expander body, which includes two ends respectively connecting the two dental engagement portions and a middle portion connecting the two ends. When the arch expander is worn, at least one of the two ends contacts the palatal tissue, and there is a gap between the middle portion and the palatal tissue.

[0014] This invention provides an arch expander, including two dental engagement portions and an arch expander portion connecting the two dental engagement portions. The arch expander portion includes an arch expander body. When the arch expander is worn, there is a gap between the entire area of ​​the arch expander body and the palatal tissue.

[0015] This invention provides an arch expander, including two tooth engagement portions and an arch expander connecting the two tooth engagement portions. The tooth engagement portions include tooth holes for accommodating teeth. The tooth holes include a first tooth hole. When the arch expander is in the wearing state, the first tooth hole is fitted onto the first tooth and at least does not contact the lingual surface of the first tooth, or the first tooth hole corresponds to a edentulous area.

[0016] This invention provides a design method for a digital bow expander, comprising:

[0017] Obtain a digital model of the palate and at least one reference region located in the palate;

[0018] Obtain a target region that deviates from the reference region, wherein the target region includes only the target region body, or the target region includes the target region body and a digital reinforcing rib located on the target region body;

[0019] Determine whether the total rigidity of the target region meets a first preset condition, the first preset condition including: the absolute value of the difference between the total rigidity and a first preset value is not greater than a first threshold;

[0020] When the first preset condition is not met, adjust the target area until the total rigidity meets the first preset condition.

[0021] A digital bow expander is generated based on the target area.

[0022] This invention provides a method for molding a bow expander, comprising:

[0023] A digital bow expander is obtained according to the design method of the digital bow expander described in any of the above technical solutions;

[0024] Generate a bow expander corresponding to the digital bow expander.

[0025] Optionally, the molding method includes:

[0026] Generate a physical dental model matching the digital expander;

[0027] A heat-pressed film is applied to a solid dental model to generate an expander corresponding to the digital expander.

[0028] This invention provides a bow expander, which is obtained according to the bow expander forming method described in any one of the above claims.

[0029] This invention provides an apparatus for designing a digital bow expander, comprising:

[0030] The first module is used to acquire a digital model of the palate and at least one reference region located in the palate.

[0031] The second module is used to obtain a target region that deviates from the reference region. The target region includes only the target region body, or the target region includes the target region body and a digital reinforcing rib located on the target region body.

[0032] The third module is used to determine whether the total rigidity of the target area meets the first preset condition, the first preset condition including: the absolute value of the difference between the total rigidity and the first preset value is not greater than the first threshold.

[0033] The fourth module adjusts the target area until the total rigidity meets the first preset condition when the first preset condition is not met.

[0034] The fifth module generates a digital bow expander based on the target area.

[0035] This invention provides an electronic device, including a processor, a memory, and a communication bus, wherein the processor and the memory communicate with each other via the communication bus;

[0036] The memory is used to store application programs;

[0037] The processor is used to implement the steps of the digital bow expander design method as described in any of the above technical solutions when executing the application program stored in the memory.

[0038] This invention provides a storage medium storing an application program, which, when executed, implements the steps of the digital bow expander design method as described in any of the above technical solutions.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows: in different application scenarios, the present invention can add different additional bow-expanding forces to different areas of the bow-expanding part body according to different bow-expanding force requirements. Attached Figure Description

[0040] Figures 1 to 8 are schematic diagrams of the arch expander and maxillary teeth in the first implementation of the present invention;

[0041] Figures 9 to 12 are schematic diagrams of the expander and maxillary teeth in the second to fourth implementation forms;

[0042] Figures 13 to 16 are schematic diagrams of the fifth type of arch expander and maxillary teeth;

[0043] Figures 17 and 18 are schematic diagrams of a single stiffener, and Figure 18 is a schematic diagram of a cross-section at three different locations in Figure 17.

[0044] Figure 19 is a schematic diagram of the first specific form of bow expander in the wearing state;

[0045] Figure 20 is a schematic diagram of the second specific form of the bow expander in the wearing state;

[0046] Figure 21 is a schematic diagram of the bow expander shown in Figures 19 and 20;

[0047] Figures 22 and 23 are schematic diagrams showing the extension of the arch expander towards the anterior teeth;

[0048] Figures 24 to 26 are schematic diagrams showing the distribution of at least one reinforcing rib;

[0049] Figure 27 is a schematic diagram of the recessed rear edge;

[0050] Figures 28 to 30 are schematic diagrams of a bow expander with a handle.

[0051] Figures 31 and 32 are schematic diagrams of two specific examples of the first tooth hole fitting with the first tooth;

[0052] Figure 33 is a schematic diagram of the second foramen fitting with the second tooth;

[0053] Figure 34 is a schematic diagram of the distribution of the first and second tooth forks;

[0054] Figures 35 and 36 are schematic diagrams of the accessory receiving cavity and the accessory;

[0055] Figures 37 to 45 are schematic diagrams of the design method of the digital bow expander according to the embodiments of the present invention;

[0056] Figure 46 is a schematic diagram of the forming method of the bow expander according to an embodiment of the present invention;

[0057] Figure 47 is a schematic diagram of the device for designing a digital bow expander according to an embodiment of the present invention. Detailed Implementation

[0058] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0059] Referring to Figures 1 and 2, an embodiment of the present invention provides a bow expander 100.

[0060] The expander 100 can be worn on the maxillary teeth to achieve maxillary expansion.

[0061] Alternatively, the expander 100 can be worn on the lower teeth to achieve mandibular expansion. In this embodiment, the expander 100 is used on the upper teeth as an example.

[0062] For ease of explanation, the anterior-posterior direction X, lateral direction Y, and vertical direction Z of the maxillary teeth and arch expander 100 are defined.

[0063] The anteroposterior direction X of the maxillary teeth is defined as the same as the anteroposterior direction X of the expander 100 when it is in use.

[0064] The anteroposterior direction X of the maxillary teeth is defined as the direction that is approximately parallel to the sagittal direction of the maxillary teeth. The anteroposterior direction X of the expander 100 is defined as the direction that is approximately parallel to the sagittal direction of the maxillary teeth when the expander 100 is in the wearing state.

[0065] The left-right direction Y of the maxillary teeth is defined as the same as the left-right direction Y of the expander 100 when it is in the wearing state.

[0066] The left-right direction Y of the maxillary teeth is defined as the direction formed between the left and right end teeth of the maxilla, i.e., the horizontal direction. The left-right direction Y of the expander 100 is defined as the direction that is approximately parallel to the horizontal direction when the expander 100 is in the wearing state.

[0067] The vertical direction Z of the maxillary teeth is defined as the same as the vertical direction Z of the expander 100 when it is in the wearing state.

[0068] The vertical direction Z of the maxillary teeth is defined as the direction formed between the occlusal surface of the maxillary teeth and the gingiva, i.e., the vertical direction. The vertical direction Z of the expander 100 is defined as the direction that is approximately parallel to the vertical direction when the expander 100 is in the wearing state.

[0069] The vertical direction Z is perpendicular to both the front-back direction X and the left-right direction Y.

[0070] In this embodiment, the arch expander 100 includes two tooth engagement portions 10 and an arch expander portion 20 connecting the two tooth engagement portions 10.

[0071] The patient's maxillary teeth are divided into left half teeth C1 and right half teeth C2 by the dental midline C.

[0072] The teeth C1 of the left half of the jaw, from the dental midline C toward the distal direction, include teeth 1, 2, 3, 4, 5, 6, and 7 in sequence. The teeth C2 of the right half of the jaw, from the dental midline C toward the distal direction, include teeth 1', 2', 3', 4', 5', 6', and 7' in sequence.

[0073] A certain tooth position can correspond to a tooth, or a certain tooth position can correspond to an area where a tooth is missing.

[0074] When the expander 100 is in the wearing state, the two tooth joints 10 cooperate with the left half-jaw tooth C1 and the right half-jaw tooth C2 respectively.

[0075] Optionally, each tooth engagement 10 includes a tooth hole 11 for receiving a tooth, and the number of tooth holes 11 included in each tooth engagement 10 can be determined as needed.

[0076] The tooth holes 11 correspond to the tooth positions. For example, the tooth hole 11 of the left tooth junction 10 corresponds to the tooth position 5, and the tooth hole 11 of the right tooth junction 10 corresponds to the tooth position 5'.

[0077] When the expander 100 is in the wearing state, each tooth hole 11 corresponds to one tooth, which can realize the mutual fixation between the expander 100 and the tooth.

[0078] When the expander 100 is in the wearing state, the expander part 20 is set to correspond to the patient's palatal tissue E.

[0079] Optionally, the expanding portion 20 is a structure capable of elastic deformation.

[0080] When worn, the expander 20 can generate an expanding force through elastic deformation.

[0081] The expansion force is applied roughly in the left-right direction Y, and the expansion force is transmitted to the corresponding tooth position through at least part of the tooth joint 10, thereby achieving the expansion of the arch.

[0082] Optionally, the bow expander 20 includes a bow expander body 21.

[0083] The bow-expanding part body 21 has a sheet-like structure and can extend along the left-right direction Y and the front-back direction X.

[0084] The left and right ends of the arch expander body 21 are respectively connected to two tooth engagement parts 10.

[0085] Optionally, there is a junction line L between the expander body 21 and the tooth junction 10. When the expander 100 is in the wearing state, the junction line L corresponds to the lingual gingival line S. The junction line L may also deviate from the lingual gingival line S. Here, we take the junction line L corresponding to the lingual gingival line S as an example.

[0086] When the expander 100 is in the wearing state, the expander body 21 is recessed towards the palatal tissue E, which can reduce the interference between the expander body 21 and other tissues in the mouth and improve the patient's wearing comfort.

[0087] Optionally, the arch expander body 21 is integrally formed with the two tooth engagement parts 10.

[0088] For example, it can be integrally formed through hot pressing or 3D printing.

[0089] Alternatively, the arch expander body 21 can be detachably connected to the two tooth engagement parts 10.

[0090] For example, the detachable connection between the arch expander body 21 and the tooth engagement part 10 can be achieved through a snap-fit ​​structure, a sliding structure, or the like.

[0091] Optionally, the main body 21 of the arch expander and the two tooth joints 10 are both made of polymer material, and the resulting arch expander 100 is an invisible arch expander.

[0092] Optionally, the arch expander body 21 can be a membrane structure with uniform thickness, and the tooth joint 10 can also be a membrane structure with uniform thickness, with the arch expander body 21 and the tooth joint 10 having the same thickness.

[0093] Optionally, the bow expander 20 can be implemented in various ways.

[0094] In the first implementation, referring to Figures 1 to 8, the bow-expanding portion 20 includes a bow-expanding portion body 21 and at least one reinforcing rib 22 connecting the bow-expanding portion body 21.

[0095] The main body 21 of the bow expander can generate a basic bow expander force, and at least one reinforcing rib 22 can generate an additional bow expander force. The setting of at least one reinforcing rib 22 can enhance the overall bow expander force of the entire bow expander 20.

[0096] Optionally, the reinforcing rib 22 is a continuous structure in the left-right direction Y, and the additional arch-expanding force generated by the reinforcing rib 22 is applied to the corresponding tooth position approximately in the left-right direction Y.

[0097] When the expander 100 is in the wearing state, the reinforcing rib 22 protrudes from the expander body 21 toward the side away from the palatal tissue E.

[0098] The bow-expanding body 21 includes a first region A1 and at least one second region A2 distributed along the front-rear direction X.

[0099] The first front edge line A11 of the first region A1 connects the proximal ends of the left and right No. 4 tooth holes 11 of the two tooth junctions 10, and the first rear edge line A12 of the first region A1 (as shown by the dotted line in Figure 2) connects the distal ends of the left and right No. 4 tooth holes 11.

[0100] The first region A1 is formed by the first front edge line A11, the first rear edge line A12, and the boundary lines L on the left and right sides.

[0101] "The proximal end of the two No. 4 tooth holes 11 on the left and right sides" refers to the front end of the left No. 4 tooth hole 11 and the front end of the right No. 4 tooth hole 11.

[0102] The first front edge line A11 is a continuous line segment connecting the front end of the left side hole 4 11 and the front end of the right side hole 4 11.

[0103] The first front edge line A11 can extend smoothly along the left-right direction Y, or the first front edge line A11 can be recessed towards the front or the rear.

[0104] "The distal ends of the two No. 4 tooth holes 11 on the left and right sides" refers to the rear end of the left No. 4 tooth hole 11 and the rear end of the right No. 4 tooth hole 11.

[0105] The first rear edge line A12 is a continuous line segment connecting the rear end of the left side hole 4 11 and the rear end of the right side hole 4 11.

[0106] The first rear edge line A12 can extend smoothly along the left-right direction Y, or the first rear edge line A12 can be recessed towards the front or the rear.

[0107] The second front edge line A21 of the second region A2 (as shown by the dashed line in Figure 2) connects the proximal ends of the two left and right N-holes 11 of the two tooth joints 10, and the second rear edge line A22 of the second region A2 (as shown by the dashed line in Figure 2) connects the distal ends of the two left and right N-holes 11. The N-holes 11 are either the 5th hole 11 or the 6th hole 11.

[0108] The second region A2 is formed by the second front edge line A21, the second rear edge line A22, and the boundary lines L on the left and right sides.

[0109] The second region A2 is located behind the first region A1.

[0110] "The proximal end of the two N-holes 11 on the left and right sides" refers to the front end of the left N-hole 11 and the front end of the right N-hole 11.

[0111] The second front edge line A21 is a continuous line segment connecting the front end of the left N-hole 11 and the front end of the right N-hole 11.

[0112] The second front edge line A21 can extend smoothly along the left-right direction Y, or the second front edge line A21 can be recessed towards the front or the rear.

[0113] "The distal ends of the two N-holes 11 on the left and right sides" refers to the rear end of the left N-hole 11 and the rear end of the right N-hole 11.

[0114] The second rear edge line A22 is an extension line segment connecting the rear end of the left N-hole 11 and the rear end of the right N-hole 11.

[0115] The second rear edge line A22 can extend smoothly along the left-right direction Y, or the second rear edge line A22 can be recessed towards the front or the rear.

[0116] Optionally, when the second region A2 corresponds to the 5th tooth hole 11, the first region A1 and the second region A2 can be two connected regions, and the second front edge line A21 and the first rear edge line A12 can be the same line segment.

[0117] At least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, or at least one reinforcing rib 22 is located in both the first region A1 and the second region A2, and the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2.

[0118] "Total rigidity of stiffener 22" refers to the total rigidity of stiffener 22 in the left-right direction Y.

[0119] The total stiffness of stiffener 22 is used to characterize the force required for stiffener 22 to compress a unit distance to the left (or right).

[0120] This force corresponds to the additional expanding force generated by the reinforcing rib 22, and the total rigidity of the reinforcing rib 22 is positively correlated with the additional expanding force generated by the reinforcing rib 22.

[0121] Referring to Figure 2, when at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first region A1 only includes the bow-expanding body 21, and the second region A2 includes the bow-expanding body 21 and the reinforcing rib 22, which makes the additional bow-expanding force at the first region A1 (the additional bow-expanding force at this time is zero) less than the additional bow-expanding force at the second region A2.

[0122] Referring to Figure 3, when at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first region A1 includes the bow-expanding body 21 and the reinforcing rib 22, and the second region A2 also includes the bow-expanding body 21 and the reinforcing rib 22.

[0123] When the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2, the additional expanding force at the first region A1 is less than the additional expanding force at the second region A2.

[0124] In different application scenarios, different additional bow-expanding forces can be added to different areas of the bow-expanding part 21 according to different bow-expanding force requirements.

[0125] In this implementation, no additional arch-expanding force or a relatively small additional arch-expanding force may be added at the first region A1 corresponding to the 4th hole 11, while a relatively large additional arch-expanding force may be added at the second region A2 corresponding to the 5th hole 11 or the 6th hole 11, which can adapt to the different arch-expanding force requirements of the 4th hole 11, the 5th hole 11, and the 6th hole 11.

[0126] Optionally, the arch expander body 21 includes two second regions A2, which correspond to the 5th hole 11 and the 6th hole 11, respectively.

[0127] The magnitude of the additional bow-expanding force in the two second regions A2 is not limited.

[0128] For example, the additional arch-expanding force of the second region A2 corresponding to the 5th hole 11 is equal to the additional arch-expanding force of the second region A2 corresponding to the 6th hole 11, or the additional arch-expanding force of the second region A2 corresponding to the 5th hole 11 is less than the additional arch-expanding force of the second region A2 corresponding to the 6th hole 11, or the additional arch-expanding force of the second region A2 corresponding to the 5th hole 11 is greater than the additional arch-expanding force of the second region A2 corresponding to the 6th hole 11.

[0129] Optionally, in conjunction with Figures 4 and 5, the first front edge line A11, the first rear edge line A12, the second front edge line A21, or the second rear edge line A22 passes through at least one reinforcing rib 22.

[0130] When an edge line passes through the reinforcing rib 22, the reinforcing rib 22 is divided into two parts located in different regions.

[0131] For example, referring to Figure 4, assuming that the second region A2 corresponds to the 5th tooth hole 11, the second front edge line A21 and the first rear edge line A12 can be the same line segment, and the first rear edge line A12 passes through a reinforcing rib 22.

[0132] The reinforcing rib 22 is divided into a first part 22a located in the first region A1 and a second part 22b located in the second region A2.

[0133] The reinforcing rib 22 is located in both the first region A1 and the second region A2. The first region A1 includes only the first part 22a, and the second region A2 includes only the second part 22b. The total rigidity of the first part 22a is less than the total rigidity of the second part 22b.

[0134] Referring to Figure 5, the reinforcing rib 22 is located in both the first region A1 and the second region A2.

[0135] Intersecting with Figure 4, the first region A1 in Figure 5 includes only the first part 22a, and the second region A2 includes the second part 22b and another reinforcing rib 22. The total rigidity of the first part 22a is less than the total rigidity of the second part 22b and the other reinforcing rib 22.

[0136] Optionally, the total rigidity of the first region A1 is greater than that of the second region A2, which can make the basic expansion force generated by the first region A1 greater than that generated by the second region A2.

[0137] "Total stiffness of the first region A1" refers to the total stiffness of the first region A1 itself in the left-right direction Y.

[0138] The total stiffness of the first region A1 is used to characterize the force required for the first region A1 to compress a unit distance to the left (or right).

[0139] This force corresponds to the basic expansion force generated by the first region A1, and the total rigidity of the first region A1 is positively correlated with the basic expansion force generated by the first region A1.

[0140] Similarly, "total stiffness of the second region A2" refers to the total stiffness of the second region A2 itself in the left-right direction Y.

[0141] The total stiffness of the second region A2 is used to characterize the force required for the second region A2 to compress a unit distance to the left (or right).

[0142] This force corresponds to the basic expansion force generated by the second region A2, and the total rigidity of the second region A2 is positively correlated with the basic expansion force generated by the second region A2.

[0143] Optionally, referring to Figures 6 and 7, when the palatal expander 100 is in the wearing state, the palatal tissue E corresponding to the first region A1 has a first maximum distance G1 between it and the reference surface P, and the palatal tissue E corresponding to the second region A2 has a second maximum distance G2 between it and the reference surface P.

[0144] "The palatal tissue E corresponding to the first region A1" means that the first region A1 and the palatal tissue E are corresponding to each other in the vertical direction Z, and the palatal tissue E is formed by the vertical downward projection of the first anterior edge line A11 and the first posterior edge line A12.

[0145] The first maximum distance G1 is the distance between the lowest point E1 of the palatal tissue E and the reference plane P. The lowest point E1 can be, for example, the midpoint of the palatal tissue E.

[0146] "The palatal tissue E corresponding to the second region A2" means that the second region A2 and the palatal tissue E are corresponding to each other in the vertical direction Z, and the palatal tissue E is formed by the vertical downward projection of the second anterior edge line A21 and the second posterior edge line A22.

[0147] The second maximum distance G2 is the distance between the lowest point E2 of the palatal tissue E and the reference plane P. The lowest point E2 can be, for example, the midpoint of the palatal tissue E.

[0148] The first maximum spacing G1 is less than the second maximum spacing G2.

[0149] "The first maximum spacing G1 is less than the second maximum spacing G2" indicates that the palatal tissue E corresponding to the first region A1 is more concave than the palatal tissue E corresponding to the second region A2.

[0150] The reference plane P is perpendicular to the vertical direction Z and passes through the junction area between the arch expander 20 and the two tooth joints 10.

[0151] For example, the reference plane P may pass through at least one of the lowest points of the two boundary lines L on the left and right sides. The lowest point may be the lowest point of the boundary line L at hole 4 11, or the lowest point of the boundary line L at hole N 11.

[0152] The lowest point of the junction line L corresponds to the lowest point of the lingual gingival line S when the tooth is worn.

[0153] The palatal tissue E corresponding to foramen N 11 is farther from the reference plane P than the palatal tissue E corresponding to foramen 4 11.

[0154] Optionally, referring to Figures 6 and 7, the first region A1 has a third maximum spacing H1 with respect to the reference surface P, and the second region A2 has a fourth maximum spacing H2 with respect to the reference surface P. The third maximum spacing H1 is smaller than the fourth maximum spacing H2.

[0155] The third maximum distance H1 can be the distance between the lowest point A13 of the first region A1 and the reference surface P. When the first region A1 is concave towards the palatal tissue E, the lowest point A13 can be, for example, the midpoint of the first region A1.

[0156] The fourth maximum spacing H2 can be the spacing between the lowest point A23 of the second region A2 and the reference surface P. When the second region A2 is concave toward the palatal tissue E, the lowest point A23 can be, for example, the midpoint of the second region A2.

[0157] The first region A1 is closer to the reference surface P than the second region A2, which makes the total stiffness of the first region A1 greater than that of the second region A2.

[0158] The first maximum spacing G1 is smaller than the second maximum spacing G2, and the third maximum spacing H1 is smaller than the fourth maximum spacing H2, which makes the first region A1 and the second region A2 more compatible with the shape of the palatal tissue E, and the entire arch expansion body 21 is smoother.

[0159] Optionally, the basic expansion force and the additional expansion force at the first region A1 work together to form the overall expansion force at the first region A1, and the overall expansion force can be applied to the fourth tooth hole 11.

[0160] The basic and additional arch-expanding forces at area A2 in the second region work together to form the overall arch-expanding force at area A2 in the second region, and the overall arch-expanding force can be applied to the N-hole 11.

[0161] The additional bow extension force at region A1 is less than the additional bow extension force at region A2, and the base bow extension force at region A1 is greater than the base bow extension force at region A2.

[0162] The relatively large basic expansion force at the first region A1 can compensate for the relatively small additional expansion force at the first region A1, and the relatively large additional expansion force at the second region A2 can compensate for the relatively small basic expansion force at the second region A2. In this way, the overall expansion force applied to foramen 4 11 and foramen N 11 can be controlled and adjusted.

[0163] Optionally, the bow-expanding section 20 includes a first bow-expanding section 201 corresponding to the first region A1 and a second bow-expanding section 202 corresponding to the second region A2.

[0164] The ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 1 / 2-2.

[0165] When at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first expanding portion 201 includes the first region A1, and the second expanding portion 202 includes the second region A2 and the reinforcing rib 22.

[0166] The total rigidity of the first expansion section 201 is the total rigidity of the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0167] When at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first bow expansion portion 201 includes the first region A1 and the reinforcing rib 22, and the second bow expansion portion 202 includes the second region A2 and the reinforcing rib 22.

[0168] The total rigidity of the first expansion section 201 is the sum of the total rigidity of the first region A1 and the total rigidity of the reinforcing rib 22 located in the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0169] The total rigidity of the first arch expander 201 represents the overall arch expander force applied to the fourth tooth hole 11, and the total rigidity of the first arch expander 201 is positively correlated with the overall arch expander force applied to the fourth tooth hole 11.

[0170] The total rigidity of the second arch expander 202 represents the overall arch expander force applied to the N-hole 11, and the total rigidity of the second arch expander 202 is positively correlated with the overall arch expander force applied to the N-hole 11.

[0171] By controlling the ratio of the total rigidity of the first expansion section 201 to the total rigidity of the second expansion section 202, the rigidity distribution of the entire expansion section 20 can be effectively controlled, thereby effectively controlling the expansion force at different tooth positions.

[0172] Optionally, the ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 2 / 3 to 3 / 2.

[0173] When the total rigidity of the first expansion part 201 is approximately equal to the total rigidity of the second expansion part 202, the overall expansion force applied to different tooth holes 11 can be kept approximately consistent, and the overall expansion force at different tooth positions can be kept approximately consistent, so that the entire jaw can be expanded evenly and stably.

[0174] Optionally, referring to Figure 8, when the expander 100 is in the wearing state, the vertical distance h between the lowest point 203 of the expander body 21 and the palatal tissue E is not less than 0.5 mm.

[0175] Figure 8 shows a cross section formed by cutting the expander 100 and the maxillary teeth along the left-right direction Y. In any cross section, the vertical distance h between the lowest point 203 of the expander body 21 and the palatal tissue E is not less than 0.5 mm.

[0176] Optionally, referring to Figure 8, the vertical distance H between the lowest point 203 of the bow-expanding body 21 and the reference surface P is no greater than 15mm.

[0177] In any cross section, the vertical distance H between the lowest point 203 of the bow-expanding body 21 and the reference surface P is not less than 0.5 mm, that is, the third maximum spacing H1 and the fourth maximum spacing H2 are both not greater than 15 mm.

[0178] Referring to Figures 9 to 12, these are schematic diagrams of the second implementation. For ease of explanation, components that are the same as or similar to those in the first implementation are numbered in the same way, and the same applies below.

[0179] In the second implementation, the bow expander 20 includes a bow expander body 21 and at least one reinforcing rib 22 connecting the bow expander body 21.

[0180] The bow-expanding body 21 includes a first region A1 and a second region A2 distributed along the front-rear direction X.

[0181] The first front edge line A11 of the first region A1 connects the proximal ends of the left and right M-sized tooth holes 11 of the two tooth junctions 10, and the first rear edge line A12 of the first region A1 connects the distal ends of the left and right M-sized tooth holes 11.

[0182] The second front edge line A21 of the second region A2 connects the proximal ends of the left and right N-shaped tooth holes 11 of the two tooth junctions 10, and the second rear edge line A22 of the second region A2 connects the distal ends of the left and right N-shaped tooth holes 11, where M and N are different positive integers.

[0183] The second region A2 is located behind the first region A1.

[0184] The second region A2 and the first region A1 are two regions corresponding to two different tooth holes 11.

[0185] Optionally, M-type hole 11 can be hole 3 or hole 4, and N-type hole 11 can be hole 5 or hole 6.

[0186] For example, when hole M is hole 4 and hole N is hole 5, the first region A1 is connected to the second region A2.

[0187] When the palatal expander 100 is in the wearing state, the palatal tissue E corresponding to the first region A1 has a first maximum distance G1 between it and the reference surface P, and the palatal tissue E corresponding to the second region A2 has a second maximum distance G2 between it and the reference surface P.

[0188] The first maximum spacing G1 is less than the second maximum spacing G2.

[0189] The reference plane P is perpendicular to the vertical direction Z and passes through the junction area between the arch expander 20 and the two tooth joints 10.

[0190] The first area A1 corresponds to the N-sized hole 11, and the second area A2 corresponds to the M-sized hole 11.

[0191] Optionally, at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1.

[0192] Alternatively, at least one reinforcing rib 22 is located in the first region A1 and the second region A2, and the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2.

[0193] When at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first region A1 includes only the bow-expanding body 21, and the second region A2 includes the bow-expanding body 21 and the reinforcing rib 22, which makes the additional bow-expanding force at the first region A1 (the additional bow-expanding force at this time is zero) less than the additional bow-expanding force at the second region A2.

[0194] When at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first region A1 includes the bow-expanding body 21 and the reinforcing rib 22, and the second region A2 also includes the bow-expanding body 21 and the reinforcing rib 22.

[0195] When the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2, the additional expanding force at the first region A1 is less than the additional expanding force at the second region A2.

[0196] The palatal tissue E corresponding to the second region A2 is farther away from the reference plane P than the palatal tissue E corresponding to the first region A1, which can add different additional arch-expanding forces to different regions corresponding to different palatal tissues E.

[0197] Optionally, the first region A1 has a third maximum spacing H1 with respect to the reference plane P, and the second region A2 has a fourth maximum spacing H2 with respect to the reference plane P, wherein the third maximum spacing H1 is smaller than the fourth maximum spacing H2.

[0198] The first region A1 is closer to the reference surface P than the second region A2, which makes the total stiffness of the first region A1 greater than that of the second region A2.

[0199] The first maximum spacing G1 is smaller than the second maximum spacing G2, and the third maximum spacing H1 is smaller than the fourth maximum spacing H2, which makes the first region A1 and the second region A2 more compatible with the shape of the palatal tissue E, and the entire arch expansion body 21 is smoother.

[0200] Optionally, the bow-expanding section 20 includes a first bow-expanding section 201 corresponding to the first region A1 and a second bow-expanding section 202 corresponding to the second region A2.

[0201] The ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 1 / 2-2.

[0202] When at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first expanding portion 201 includes the first region A1, and the second expanding portion 202 includes the second region A2 and the reinforcing rib 22.

[0203] The total rigidity of the first expansion section 201 is the total rigidity of the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0204] When at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first bow expansion portion 201 includes the first region A1 and the reinforcing rib 22, and the second bow expansion portion 202 includes the second region A2 and the reinforcing rib 22.

[0205] The total rigidity of the first expansion section 201 is the sum of the total rigidity of the first region A1 and the total rigidity of the reinforcing rib 22 located in the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0206] By controlling the ratio of the total rigidity of the first expansion section 201 to the total rigidity of the second expansion section 202, the rigidity distribution of the entire expansion section 20 can be effectively controlled, thereby effectively controlling the expansion force at different tooth positions.

[0207] Optionally, the ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 2 / 3 to 3 / 2.

[0208] When the total rigidity of the first expansion part 201 is approximately equal to the total rigidity of the second expansion part 202, the overall expansion force applied to different tooth foramina can be kept approximately consistent, and the overall expansion force at different tooth positions can be kept approximately consistent, so that the entire jaw can be expanded in a balanced and stable manner.

[0209] Further details regarding the second implementation can be found in the description of the first implementation, and will not be repeated here.

[0210] In the third implementation, referring to Figures 9 to 12, the bow-expanding portion 20 includes a bow-expanding portion body 21 and at least one reinforcing rib 22 connecting the bow-expanding portion body 21.

[0211] The bow-expanding body 21 includes a first region A1 and a second region A2 distributed along the front-rear direction X.

[0212] The first front edge line A11 of the first region A1 connects the proximal ends of the left and right M-sized tooth holes 11 of the two tooth junctions 10, and the first rear edge line A12 of the first region A1 connects the distal ends of the left and right M-sized tooth holes 11.

[0213] The second front edge line A21 of the second region A2 connects the proximal ends of the left and right N-shaped tooth holes 11 of the two tooth junctions 10, and the second rear edge line A22 of the second region A2 connects the distal ends of the left and right N-shaped tooth holes 11, where M and N are different positive integers.

[0214] The second region A2 is located behind the first region A1.

[0215] The second region A2 and the first region A1 are two regions corresponding to two different tooth holes 11.

[0216] Optionally, M-type hole 11 can be hole 3 or hole 4, and N-type hole 11 can be hole 5 or hole 6.

[0217] For example, when hole M is hole 4 and hole N is hole 5, the first region A1 is connected to the second region A2.

[0218] Optionally, the first region A1 has a third maximum spacing H1 with respect to the reference plane P, and the second region A2 has a fourth maximum spacing H2 with respect to the reference plane P.

[0219] The third maximum spacing H1 is less than the fourth maximum spacing H2.

[0220] The reference plane P is perpendicular to the vertical direction Z and passes through the junction area between the arch expander 20 and the two tooth joints 10.

[0221] The first region A1 is closer to the reference surface P than the second region A2, which makes the total stiffness of the first region A1 greater than that of the second region A2.

[0222] At least one reinforcing rib 22 is located in the second region A2 and not in the first region A1.

[0223] Alternatively, at least one reinforcing rib 22 is located in the first region A1 and the second region A2, and the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2.

[0224] When at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first region A1 includes only the bow-expanding body 21, and the second region A2 includes the bow-expanding body 21 and the reinforcing rib 22, which makes the additional bow-expanding force at the first region A1 (the additional bow-expanding force at this time is zero) less than the additional bow-expanding force at the second region A2.

[0225] When at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first region A1 includes the bow-expanding body 21 and the reinforcing rib 22, and the second region A2 also includes the bow-expanding body 21 and the reinforcing rib 22.

[0226] When the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2, the additional expanding force at the first region A1 is less than the additional expanding force at the second region A2.

[0227] In different application scenarios, different additional bow-expanding forces can be added to different areas of the bow-expanding part 21 according to different bow-expanding force requirements.

[0228] In this implementation, no additional arch-expanding force or a relatively small additional arch-expanding force can be added at the first region A1 corresponding to the N-sized tooth hole 11, while a relatively large additional arch-expanding force can be added at the second region A2 corresponding to the M-sized tooth hole 11, which can adapt to the different arch-expanding force requirements of the N-sized tooth hole 11 and the M-sized tooth hole 11.

[0229] Optionally, when the palatal expander 100 is in the wearing state, the palatal tissue E corresponding to the first region A1 has a first maximum distance G1 between it and the reference surface P, and the palatal tissue E corresponding to the second region A2 has a second maximum distance G2 between it and the reference surface P.

[0230] The first maximum spacing G1 is less than the second maximum spacing G2.

[0231] The palatal tissue E corresponding to tooth hole N11 is farther from the reference plane P than the palatal tissue E corresponding to tooth hole M11.

[0232] The first maximum spacing G1 is smaller than the second maximum spacing G2, and the third maximum spacing H1 is smaller than the fourth maximum spacing H2, which makes the first region A1 and the second region A2 more compatible with the shape of the palatal tissue E, and the entire arch expansion body 21 is smoother.

[0233] Optionally, the bow-expanding section 20 includes a first bow-expanding section 201 corresponding to the first region A1 and a second bow-expanding section 202 corresponding to the second region A2.

[0234] The ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 1 / 2-2.

[0235] When at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first expanding portion 201 includes the first region A1, and the second expanding portion 202 includes the second region A2 and the reinforcing rib 22.

[0236] The total rigidity of the first expansion section 201 is the total rigidity of the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0237] When at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first bow expansion portion 201 includes the first region A1 and the reinforcing rib 22, and the second bow expansion portion 202 includes the second region A2 and the reinforcing rib 22.

[0238] The total rigidity of the first expansion section 201 is the sum of the total rigidity of the first region A1 and the total rigidity of the reinforcing rib 22 located in the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0239] By controlling the ratio of the total rigidity of the first expansion section 201 to the total rigidity of the second expansion section 202, the rigidity distribution of the entire expansion section 20 can be effectively controlled, thereby effectively controlling the expansion force at different tooth positions.

[0240] Optionally, the ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 2 / 3 to 3 / 2.

[0241] When the total rigidity of the first expansion part 201 is approximately equal to the total rigidity of the second expansion part 202, the overall expansion force applied to different tooth foramina can be kept approximately consistent, and the overall expansion force at different tooth positions can be kept approximately consistent, so that the entire jaw can be expanded in a balanced and stable manner.

[0242] For further explanation of the third implementation, please refer to the explanation of the first implementation; it will not be repeated here.

[0243] In the fourth implementation, referring to Figures 9 to 12, the bow-expanding portion 20 includes a bow-expanding portion body 21 and at least one reinforcing rib 22 connecting the bow-expanding portion body 21.

[0244] The bow-expanding body 21 includes a first region A1 and a second region A2 distributed along the front-rear direction X.

[0245] The first front edge line A11 of the first region A1 connects the proximal ends of the left and right M-sized tooth holes 11 of the two tooth junctions 10, and the first rear edge line A12 of the first region A1 connects the distal ends of the left and right M-sized tooth holes 11.

[0246] The second front edge line A21 of the second region A2 connects the proximal ends of the left and right N-shaped tooth holes 11 of the two tooth junctions 10, and the second rear edge line A22 of the second region A2 connects the distal ends of the left and right N-shaped tooth holes 11, where M and N are different positive integers.

[0247] The second region A2 is located behind the first region A1.

[0248] The second region A2 and the first region A1 are two regions corresponding to two different tooth holes 11.

[0249] Optionally, M-hole 11 is one of the holes 3 to 6, and N-hole 11 is the other of the holes 3 to 6.

[0250] For example, when hole M is hole 4 and hole N is hole 5, the first region A1 is connected to the second region A2.

[0251] Optionally, at least one reinforcing rib 22 is located in the first region A1 and / or the second region A2.

[0252] The bow-expanding section 20 includes a first bow-expanding section 201 corresponding to the first region A1 and a second bow-expanding section 202 corresponding to the second region A2.

[0253] The ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 1 / 2-2.

[0254] By controlling the ratio of the total rigidity of the first expansion section 201 to the total rigidity of the second expansion section 202, the rigidity distribution of the entire expansion section 20 can be effectively controlled, thereby effectively controlling the expansion force at different tooth positions.

[0255] Optionally, the ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 2 / 3 to 3 / 2.

[0256] When the total rigidity of the first expansion part 201 is approximately equal to the total rigidity of the second expansion part 202, the overall expansion force applied to different tooth foramina can be kept approximately consistent, and the overall expansion force at different tooth positions can be kept approximately consistent, so that the entire jaw can be expanded in a balanced and stable manner.

[0257] Optionally, at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1.

[0258] Alternatively, at least one reinforcing rib 22 is located in the first region A1 and the second region A2, and the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2.

[0259] When at least one reinforcing rib 22 is located in the second region A2 and not in the first region A1, the first region A1 includes only the bow-expanding body 21, and the second region A2 includes the bow-expanding body 21 and the reinforcing rib 22, which makes the additional bow-expanding force at the first region A1 (the additional bow-expanding force at this time is zero) less than the additional bow-expanding force at the second region A2.

[0260] The first bow-expanding section 201 includes a first region A1, and the second bow-expanding section 202 includes a second region A2 and a reinforcing rib 22.

[0261] The total rigidity of the first expansion section 201 is the total rigidity of the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0262] When at least one reinforcing rib 22 is located in the first region A1 and the second region A2, the first region A1 includes the bow-expanding body 21 and the reinforcing rib 22, and the second region A2 also includes the bow-expanding body 21 and the reinforcing rib 22.

[0263] When the total rigidity of the reinforcing rib 22 in the first region A1 is less than the total rigidity of the reinforcing rib 22 in the second region A2, the additional expanding force at the first region A1 is less than the additional expanding force at the second region A2.

[0264] The first bow-expanding portion 201 includes a first region A1 and a reinforcing rib 22, and the second bow-expanding portion 202 includes a second region A2 and a reinforcing rib 22.

[0265] The total rigidity of the first expansion section 201 is the sum of the total rigidity of the first region A1 and the total rigidity of the reinforcing rib 22 located in the first region A1, and the total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the reinforcing rib 22 located in the second region A2.

[0266] Optionally, when the palatal expander 100 is in the wearing state, the palatal tissue E corresponding to the first region A1 has a first maximum distance G1 between it and the reference surface P, and the palatal tissue E corresponding to the second region A2 has a second maximum distance G2 between it and the reference surface P.

[0267] The first maximum spacing G1 is less than the second maximum spacing G2.

[0268] The reference plane P is perpendicular to the vertical direction Z and passes through the junction area between the arch expander 20 and the two tooth joints 10.

[0269] The palatal tissue E corresponding to tooth hole N11 is farther from the reference plane P than the palatal tissue E corresponding to tooth hole M11.

[0270] The first region A1 has a third maximum distance H1 between it and the reference plane P, and the second region A2 has a fourth maximum distance H2 between it and the reference plane P.

[0271] The third maximum spacing H1 is less than the fourth maximum spacing H2.

[0272] The first region A1 is closer to the reference surface P than the second region A2, which makes the total stiffness of the first region A1 greater than that of the second region A2.

[0273] The first maximum spacing G1 is smaller than the second maximum spacing G2, and the third maximum spacing H1 is smaller than the fourth maximum spacing H2, which makes the first region A1 and the second region A2 more compatible with the shape of the palatal tissue E, and the entire arch expansion body 21 is smoother.

[0274] For further explanation of the fourth implementation, please refer to the explanation of the first implementation; it will not be repeated here.

[0275] Optionally, for the aforementioned first to fourth implementation forms, the first region A1 and the second region A2 are all defined and described.

[0276] Optionally, for the aforementioned first to fourth implementation forms, in conjunction with Figure 10, at least one reinforcing rib 22 includes a first reinforcing rib 221 located in the first region A1 and a second reinforcing rib 222 located in the second region A2.

[0277] The first reinforcing rib 221 and the second reinforcing rib 222 satisfy at least one of the following:

[0278] The total volume of the first reinforcing rib 221 is less than the total volume of the second reinforcing rib 222. The total volume is defined as the volume formed by the outer contour of the reinforcing rib 22.

[0279] The maximum length of the first reinforcing rib 221 in the left-right direction Y is less than the maximum length of the second reinforcing rib 222 in the left-right direction Y, and the length is the length formed by the outer contour of the reinforcing rib 22.

[0280] The maximum height of the first reinforcing rib 221 in the vertical direction Z is less than the maximum height of the second reinforcing rib 222 in the vertical direction, and the height is the height formed by the outer contour of the reinforcing rib 22.

[0281] The maximum width of the first reinforcing rib 221 in the front-rear direction X is less than the maximum width of the second reinforcing rib 222 in the front-rear direction, and the width is the width formed by the outer contour of the reinforcing rib 22.

[0282] The maximum cross-sectional moment of inertia of the first stiffener 221 in the front-rear direction X is less than the maximum cross-sectional moment of inertia of the second stiffener 222 in the front-rear direction X. The cross-sectional moment of inertia is the moment of inertia of the section formed by cutting the stiffener 22 along the front-rear direction X.

[0283] The average thickness of the first reinforcing rib 221 is less than the average thickness of the second reinforcing rib 222.

[0284] The average elastic modulus of the first reinforcing rib 221 is less than that of the second reinforcing rib 222.

[0285] When the first reinforcing rib 221 and the second reinforcing rib 222 satisfy at least one of the above conditions, the total rigidity of the first reinforcing rib 221 is less than the total rigidity of the second reinforcing rib 222.

[0286] Optionally, at least one reinforcing rib 22 includes a first reinforcing rib 221 located in the first region A1 and a plurality of second reinforcing ribs 222 located in the second region A2, the plurality of second reinforcing ribs 222 being distributed along the front-rear direction X.

[0287] The number of second reinforcing ribs 222 in the second region A2 is greater than the number of first reinforcing ribs 221 in the first region A1, and the total rigidity of one first reinforcing rib 221 is less than the total rigidity of multiple second reinforcing ribs 222.

[0288] Optionally, at least one reinforcing rib 22 includes a plurality of first reinforcing ribs 221 located in the first region A1 and a plurality of second reinforcing ribs 222 located in the second region A2, wherein the plurality of first reinforcing ribs 221 and the plurality of second reinforcing ribs 222 are distributed along the front-back direction X.

[0289] The total rigidity of the multiple first stiffeners 221 is less than the total rigidity of the multiple second stiffeners 222.

[0290] In the fifth implementation, referring to Figures 13 to 16, the bow-expanding portion 20 includes a bow-expanding portion body 21 and a plurality of reinforcing ribs 22 connecting the bow-expanding portion body 21.

[0291] Multiple reinforcing ribs 22 are spaced apart along the front-to-back direction X.

[0292] Each reinforcing rib 22 extends approximately along the left-right direction Y.

[0293] The plurality of reinforcing ribs 22 include a first reinforcing rib 221 and a second reinforcing rib 222 distributed along the front-rear direction X. The first reinforcing rib 221 is located at the front end of the second reinforcing rib 222, and the total rigidity of the first reinforcing rib 221 is less than the total rigidity of the second reinforcing rib 222.

[0294] The multiple reinforcing ribs 22 distributed along the front-back direction X have different total rigidity, which can provide different additional arch-expanding forces to different areas of the tooth joint 10.

[0295] Optionally, the first reinforcing rib 221 and the second reinforcing rib 222 satisfy at least one of the following:

[0296] The total volume of the first reinforcing rib 221 is smaller than the total volume of the second reinforcing rib 222.

[0297] The maximum length of the first reinforcing rib 221 in the left-right direction Y is less than the maximum length of the second reinforcing rib 222 in the left-right direction Y.

[0298] The maximum height of the first reinforcing rib 221 in the vertical direction Z is less than the maximum height of the second reinforcing rib 222 in the vertical direction Z.

[0299] The maximum width of the first reinforcing rib 221 in the front-rear direction X is less than the maximum width of the second reinforcing rib 222 in the front-rear direction X.

[0300] The maximum moment of inertia of the first stiffener 221 in the front-rear direction X is less than the maximum moment of inertia of the second stiffener 222 in the front-rear direction.

[0301] The average thickness of the first reinforcing rib 221 is less than the average thickness of the second reinforcing rib 222.

[0302] The average elastic modulus of the first reinforcing rib 221 is less than that of the second reinforcing rib 222.

[0303] When the first reinforcing rib 221 and the second reinforcing rib 222 satisfy at least one of the above conditions, the total rigidity of the first reinforcing rib 221 is less than the total rigidity of the second reinforcing rib 222.

[0304] Optionally, the bow-expanding body 21 includes a first region A1 and a second region A2 distributed along the front-rear direction X.

[0305] The first front edge line A11 of the first region A1 connects the proximal ends of the left and right M-sized tooth holes 11 of the two tooth junctions 10, and the first rear edge line A12 of the first region A1 connects the distal ends of the left and right M-sized tooth holes 11.

[0306] The second front edge line A21 of the second region A2 connects the proximal ends of the left and right N-shaped tooth holes 11 of the two tooth junctions 10, and the second rear edge line A22 of the second region A2 connects the distal ends of the left and right N-shaped tooth holes 11, where M and N are different positive integers.

[0307] Optionally, M-hole 11 is one of the holes 3 to 6, and N-hole 11 is the other of the holes 3 to 6.

[0308] Optionally, the second region A2 is located behind the first region A1.

[0309] The second region A2 and the first region A1 are two regions corresponding to two different tooth holes 11.

[0310] For example, when hole M is hole 4 and hole N is hole 5, the first region A1 is connected to the second region A2.

[0311] Optionally, the first reinforcing rib 221 is located in the first region A1 and the second reinforcing rib 222 is located in the second region A2.

[0312] The entire first reinforcing rib 221 is located within the coverage area of ​​the first region A1, and the entire second reinforcing rib 222 is located within the coverage area of ​​the second region A2.

[0313] Alternatively, the first front edge line A11 or the first rear edge line A12 passes through the first reinforcing rib 221.

[0314] A portion of the first reinforcing rib 221 is located in the first region A1, and another portion is located in the second region A2 or other regions.

[0315] Alternatively, the second front edge line A21 or the second rear edge line A22 passes through the second reinforcing rib 222.

[0316] A portion of the second reinforcing rib 222 is located in the second region A2, and another portion is located in the first region A1 or other regions.

[0317] Optionally, when the palatal expander 100 is in the wearing state, the palatal tissue E corresponding to the first region A1 has a first maximum distance G1 between it and the reference surface P, and the palatal tissue E corresponding to the second region A2 has a second maximum distance G2 between it and the reference surface P.

[0318] The first maximum spacing G1 is less than the second maximum spacing G2.

[0319] The reference plane P is perpendicular to the vertical direction Z and passes through the junction area between the arch expander 20 and the two tooth joints 10.

[0320] The palatal tissue E corresponding to tooth hole N11 is farther from the reference plane P than the palatal tissue E corresponding to tooth hole M11.

[0321] Optionally, the total stiffness of the first region A1 is greater than the total stiffness of the second region A2.

[0322] The first region A1 has a third maximum distance H1 between it and the reference plane P, and the second region A2 has a fourth maximum distance H2 between it and the reference plane P.

[0323] The third maximum spacing H1 is less than the fourth maximum spacing H2.

[0324] The first region A1 is closer to the reference surface P than the second region A2, which makes the total stiffness of the first region A1 greater than that of the second region A2.

[0325] The first maximum spacing G1 is smaller than the second maximum spacing G2, and the third maximum spacing H1 is smaller than the fourth maximum spacing H2, which makes the first region A1 and the second region A2 more compatible with the shape of the palatal tissue E, and the entire arch expansion body 21 is smoother.

[0326] Optionally, the bow-expanding section 20 includes a first bow-expanding section 201 corresponding to the first region A1 and a second bow-expanding section 202 corresponding to the second region A2.

[0327] The ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 1 / 2-2.

[0328] Taking the example of the first reinforcing rib 221 being located in the first region A1 and the second reinforcing rib 222 being located in the second region A2.

[0329] The first bow-expanding portion 201 includes a first region A1 and a first reinforcing rib 221, and the second bow-expanding portion 202 includes a second region A2 and a second reinforcing rib 222.

[0330] The total rigidity of the first expansion section 201 is the sum of the total rigidity of the first region A1 and the total rigidity of the first reinforcing rib 221 located in the first region A1. The total rigidity of the second expansion section 202 is the sum of the total rigidity of the second region A2 and the total rigidity of the second reinforcing rib 222 located in the second region A2.

[0331] By controlling the ratio of the total rigidity of the first expansion section 201 to the total rigidity of the second expansion section 202, the rigidity distribution of the entire expansion section 20 can be effectively controlled, thereby effectively controlling the expansion force at different tooth positions.

[0332] Optionally, the ratio of the total rigidity of the first bow expansion section 201 to the total rigidity of the second bow expansion section 202 is in the range of 2 / 3 to 3 / 2.

[0333] When the total rigidity of the first expansion part 201 is approximately equal to the total rigidity of the second expansion part 202, the overall expansion force applied to different tooth foramina can be kept approximately consistent, and the overall expansion force at different tooth positions can be kept approximately consistent, so that the entire jaw can be expanded in a balanced and stable manner.

[0334] For further explanation of the fifth implementation, please refer to the explanation of the first implementation; it will not be repeated here.

[0335] Optionally, referring to Figures 17 and 18, for a reinforcing rib 22, in the direction from the center of the reinforcing rib 22 toward the tooth joint 10, the cross-sectional moment of inertia of the reinforcing rib 22 in the front-rear direction X shows a decreasing trend.

[0336] "The direction in which the center of the reinforcing rib 22 faces the tooth joint 10" refers to the direction in which the center of the reinforcing rib 22 extends to the left or to the right.

[0337] The outer contour of the stiffener 22 is roughly arched. Along the left-right direction Y, the moment of inertia of the stiffener 22 in section first increases and then decreases.

[0338] Optionally, for a reinforcing rib 22, the reinforcing rib 22 has a first height D in the vertical direction Z, and the first height D tends to decrease in the direction from the center of the reinforcing rib 22 toward the tooth joint 10.

[0339] The outer contour of the reinforcing rib 22 is roughly arched. Along the left-right direction Y, the first height D of the reinforcing rib 22 shows a trend of first increasing and then decreasing.

[0340] Optionally, for a reinforcing rib 22, the reinforcing rib 22 has a first width W in the front-rear direction X, and the first width W tends to decrease in the direction from the center of the reinforcing rib 22 toward the tooth joint 10.

[0341] The outer contour of the reinforcing rib 22 is roughly arched, and along the left-right direction Y, the first width W of the reinforcing rib 22 shows a trend of first increasing and then decreasing.

[0342] Optionally, the reinforcing rib 22 is integrally formed with the bow-expanding body 21.

[0343] For example, the reinforcing rib 22, the arch expander body 21, and the tooth joint 10 can be integrally formed by hot pressing or 3D printing.

[0344] The reinforcing rib 22 and the bow-expanding body 21 can also be detachably connected.

[0345] Optionally, the reinforcing rib 22 can be a hollow structure or a solid structure.

[0346] Referring to Figure 18, when the reinforcing rib 22 is a hollow structure, the reinforcing rib 22 surrounds and forms a cavity S1.

[0347] When the expander 100 is in the wearing state, the cavity S1 is recessed towards the side away from the palatal tissue E, and the bottom surface of the expander 20 is hollowed out in the area corresponding to the reinforcing rib 22.

[0348] When the reinforcing rib 22 is a solid structure, the entire bottom surface of the expanding bow portion 20 can be a continuous bottom surface.

[0349] Optionally, in conjunction with Figures 19 to 21, the bow-expanding body 21 can have various specific forms.

[0350] Referring to Figure 19, in the first specific form, the arch expander body 21 includes two end portions 211 that connect the two tooth engagement portions 10 respectively, and a middle portion 212 that connects the two end portions 211.

[0351] The middle part 212 has two ends 211 on its left and right sides, and each end 211 connects the middle part 212 and the corresponding tooth engagement part 10.

[0352] One end 211, the middle part 212 and the other end 211 are arranged sequentially along the left-right direction Y.

[0353] When the expander 100 is in the wearing state, at least one of the two ends 211 contacts the palatal tissue E, and the middle part 212 has a gap Q between it and the palatal tissue E.

[0354] "At least one of the two ends 211 contacts the palatal tissue E" means that at least one end 211 is in close contact with the palatal tissue E, and the palatal tissue E in contact with the end 211 can assist in the transmission of the arch-expanding force.

[0355] "The gap Q between the middle part 212 and the palatal tissue E" means that the middle part 212 and the palatal tissue E are not in contact.

[0356] Optionally, when the expander 100 is in the wearing state, the junction line L between the expander body 21 and the tooth junction 10 corresponds to the lingual gingival line S.

[0357] The area where end 211 connects to the junction line L contacts the palatal tissue E, that is, the palatal tissue E that connects to the lingual gingival line S contacts end 211.

[0358] The end 211 that contacts the palatal tissue E can serve as an extension of the dental junction 10, thereby improving the ability to enclose the tooth.

[0359] Optionally, when the expander 100 is worn, at least one of the two ends 211 has its entire area in contact with the palatal tissue E, and the entire area of ​​the middle portion 212 has a gap Q between it and the palatal tissue E.

[0360] "At least one of the two ends 211 is in contact with the palatal tissue E in its entirety" means that all areas of the end 211 in the anterior-posterior direction X are in contact with the palatal tissue E, which can increase the contact area between the end 211 and the palatal tissue E, thereby improving the arch expansion effect and the ability to wrap the teeth.

[0361] "The entire area of ​​the middle part 212 has a gap Q between it and the palatal tissue E" means that the middle part 212 does not contact the palatal tissue E in any area in the front-back direction X and the left-right direction Y, and the entire middle area of ​​the arch-expanding body 21 is suspended above the palatal tissue E.

[0362] Optionally, one end 211 has a first length K in the first direction Y1, wherein the first length K is not greater than 6 mm.

[0363] The first length K can be considered as the extension length of the boundary line L along the first direction Y1, and the ends 211 of the first length K can be closely attached to the palatal tissue E.

[0364] The first direction Y1 is the direction in which one of the ends 211 extends to the middle part 212, and the first direction Y1 extends on the surface of the bow-expanding part body 21.

[0365] Referring to Figure 19, in this specific form, the regions where the two ends 211 of the arch-expanding body 21 connect to the boundary line L are in contact with the palatal tissue E, while the middle part 212 is not in contact with the palatal tissue E at all.

[0366] Along the left-right direction Y, the relationship between the entire arch-expanding body 21 and the palatal tissue E is "contact - non-contact - contact".

[0367] The relationship between the entire arch expander body 21 and the palatal tissue E is a smooth transition, which makes it easy to form the arch expander body 21 using a hot press molding process.

[0368] Referring to Figure 20, which is a schematic diagram of the second specific form, for ease of explanation, the components that are the same or similar to those in the second specific form and the first specific form are numbered the same or similarly.

[0369] In the second specific form, when the expander 100 is worn, there is a gap Q between the entire area of ​​the expander body 21 and the palatal tissue E.

[0370] "The entire area of ​​the expander body 21 has a gap Q between it and the palatal tissue E" means that the entire area of ​​the expander body 21 does not contact the palatal tissue E, and the entire expander body 21 is suspended above the palatal tissue E, which can prevent the expander body 21 from applying unnecessary force to the palatal tissue E.

[0371] Optionally, the arch expander body 21 includes two ends 211 that connect the two tooth engagement portions 10 respectively, and a middle portion 212 that connects the two ends 211.

[0372] When the expander 100 is in the wearing state, the gap Q between the end 211 and the palatal tissue E tends to increase along the first direction Y1, which is the direction in which the end 211 extends to the middle of the middle part 212, and the first direction Y1 extends on the surface of the expander body 21.

[0373] Taking the left end 211 as an example, the first direction Y1 is the direction in which the left end 211 extends to the middle part 212. In the first direction Y1, the gap Q between the left end 211 and the palatal tissue E tends to increase, which can make the gap Q between the end 211 near the junction line L and the palatal tissue E smaller, thus enhancing the ability to wrap the teeth.

[0374] Optionally, one end 211 has a first length K in the first direction Y1, wherein the first length K is not greater than 6 mm.

[0375] The first length K can be considered as the extension length of the boundary line L along the first direction Y1. The gap Q between the end 211 of the first length K and the palatal tissue E increases from the boundary line L.

[0376] Optionally, when the expander 100 is worn, at least part of the gap Q between the middle portion 212 and the palatal tissue E remains unchanged.

[0377] "Remain unchanged" means that the gap Q remains unchanged along the left-right direction Y or the front-back direction X.

[0378] At least a portion of the middle portion 212 can be obtained by offsetting the upper surface of the corresponding palatal tissue E as a whole, which ensures that the gap Q between at least a portion of the middle portion 212 and the palatal tissue E remains at the offset amount.

[0379] Referring to Figure 20, in this specific form, along the left-right direction Y, the gap Q between the entire arch-expanding body 21 and the palatal tissue E is roughly "gradually increasing - remaining unchanged - gradually decreasing".

[0380] Optionally, for the two specific forms mentioned above, when the expanding part body 21 is provided with a reinforcing rib 22, the reinforcing rib 22 protrudes out of the expanding part body 21 in a direction away from the gap Q.

[0381] When the reinforcing rib 22 surrounds and forms a cavity S1, the cavity S1 is connected to the gap Q.

[0382] Optionally, the reinforcing rib 22 may connect at least to the middle portion 212.

[0383] Referring to Figure 21, the reinforcing rib 22 extends to the end 211 but does not extend to the boundary line L. The reinforcing rib 22 connects the middle part 212 and the end 211.

[0384] Alternatively, the reinforcing rib 22 does not extend to the end 211, and the reinforcing rib 22 only connects to the middle part 212.

[0385] The reinforcing rib 22 does not extend completely to the boundary line L, that is, there is a gap Q1 between the reinforcing rib 22 and the boundary line L. This gap Q1 can reduce the release stiffness of the expander 100.

[0386] The tooth junction 10 includes a buccal surface 12 corresponding to the buccal surface of the tooth, and the bottom edge 121 of the buccal surface 12 is a free area.

[0387] Release stiffness is used to characterize the force required when the buccal surface 12 is moved a unit distance away from the buccal surface of the tooth.

[0388] This force corresponds to an upward external force applied to the bottom edge 121 of the buccal side 12, which is used to disengage the tooth engagement 10 from the tooth.

[0389] The release rigidity is positively correlated with the external force. That is, when the release rigidity of the expander 100 is small, the external force required to release the tooth joint 10 is small, and the smaller the release rigidity, the easier it is to release the tooth.

[0390] Optionally, the spacing Q1 between the endpoint of the reinforcing rib 22 and the boundary line L ranges from 1mm to 6mm.

[0391] "The distance Q1 between the endpoint and the boundary line L" refers to the distance between the left endpoint of the stiffener 22 and the left boundary line L, and the distance between the right endpoint of the stiffener 22 and the right boundary line L.

[0392] By controlling the spacing Q1 between the endpoint of the reinforcing rib 22 and the boundary line L, the difficulty of unsleeving and the total rigidity of the reinforcing rib 22 can be adjusted simultaneously.

[0393] Optionally, the spacing Q1 between the endpoint of the reinforcing rib 22 and the boundary line L ranges from 2mm to 4mm.

[0394] Optionally, referring to Figure 21, when the expander 100 is in the wearing state, the two tooth joints 10 are respectively fitted onto the left posterior tooth T21 and the right posterior tooth T22, and the two tooth joints 10 are not fitted onto the anterior tooth T1.

[0395] Since the tooth junction 10 is not fitted onto the anterior tooth T1, the expansion force generated by the expander 100 is not applied to the anterior tooth T1. The expansion force is mainly applied to the posterior teeth to achieve expansion of the posterior tooth region.

[0396] The arch expander body 21 has a front edge 213 and a rear edge 214 arranged opposite to each other along the front-rear direction X. The front edge 213 of the arch expander body 21 shown in Figure 21 is roughly the line connecting the proximal ends of the two tooth holes 11 on the left and right sides. The front edge 213 does not protrude toward the area of ​​the anterior tooth T1.

[0397] Optionally, referring to Figure 22, when the expander 100 is in the wearing state, the two tooth engagement portions 10 are respectively fitted onto the left posterior tooth T21 and the right posterior tooth T22, the expander body 21 extends to the anterior tooth T1, and the expander body 21 does not cover the lingual surface T11 of the anterior tooth T1.

[0398] The main difference between Figure 22 and Figure 21 is that the main body 21 of the arch expander in Figure 22 extends toward the anterior tooth T1, and the front edge 213 protrudes toward the area of ​​the anterior tooth T1.

[0399] The anterior margin 213 can roughly match the lingual gingival line S at the anterior tooth T1, or there is a gap between the anterior margin 213 and the lingual gingival line S.

[0400] Compared to Figure 21, the arch expander body 21 shown in Figure 22 also includes a first extension region 215 extending to the anterior tooth T1.

[0401] The first extended area 215 can be used to support the functional accessory 30.

[0402] Functional accessory 30, for example, is the palatine bead.

[0403] Optionally, referring to Figure 23, when the expander 100 is in the wearing state, the two tooth engagement portions 10 are respectively fitted onto the left posterior tooth T21 and the right posterior tooth T22, the expander body 21 extends to the anterior tooth T1, and the expander body 21 covers at least part of the lingual surface T11 of the anterior tooth T1.

[0404] The main difference between Figure 23 and Figure 22 is that the arch expander body 21 in Figure 23 extends further toward the lingual surface T11 of the anterior tooth T1.

[0405] The arch expander body 21 shown in Figure 23 includes a first extension region 215 extending to the anterior tooth T1, and a second extension region 216 corresponding to the lingual surface T11 of the anterior tooth T1.

[0406] Both the first extension region 215 and the second extension region 216 can be used to support the functional accessory 30.

[0407] Functional accessory 30, for example, is the palatine bead.

[0408] The second extension region 216 extends only to the lingual surface T11 of the anterior tooth T1. The second extension region 216 does not extend further to the incisal or buccal surface of the anterior tooth T1, but is not limited thereto.

[0409] There may be a gap between the second extension region 216 and the lingual surface T11 of the anterior tooth T1.

[0410] When the expander 100 generates an expanding force, the expanding force is not transmitted to the anterior teeth T1 through the second extension region 216, but this is not the limitation.

[0411] Optionally, the bow-expanding body 21 has a front end edge 213 and a rear end edge 214 that are disposed opposite to each other along the front-rear direction X.

[0412] Take, for example, the bow-expanding body 21 shown in Figure 21, which does not include the first extension region 215 or the second extension region 216.

[0413] The reinforcing rib 22 is set near the front edge 213 or the rear edge 214.

[0414] Referring to Figure 24, when the arch expander 20 includes only one reinforcing rib 22, the reinforcing rib 22 is disposed near the rear end edge 214, and the reinforcing rib 22 is disposed corresponding to the farthest tooth hole 11 on the left and right sides.

[0415] Referring to Figure 25, when the expanding portion 20 includes two reinforcing ribs 22, the two reinforcing ribs 22 are respectively located near the front edge 213 and the rear edge 214.

[0416] One of the reinforcing ribs 22 is provided corresponding to the farthest tooth hole 11 on the left and right sides, and the other reinforcing rib 22 is provided corresponding to the nearest tooth hole 11 on the left and right sides.

[0417] Referring to Figure 26, when each tooth joint 10 corresponds to three tooth holes 11 and the arch expansion part 20 includes three reinforcing ribs 22, the three reinforcing ribs 22 are respectively provided for the three pairs of tooth holes 11 on the left and right sides.

[0418] When each tooth joint 10 corresponds to four tooth holes 11 and the arch expansion part 20 includes three reinforcing ribs 22, the three reinforcing ribs 22 are respectively provided for the three pairs of tooth holes 11 on the left and right sides.

[0419] The three pairs of foramina 11 can be the three pairs of foramina 11 that are relatively distal, or the pair of foramina 11 that are most distal, the pair of foramina 11 that are most proximal, and the pair of foramina 11 that are in the middle.

[0420] Optionally, referring to Figure 27, the rear edge 214 is recessed on the side facing the front edge 213, which can reduce the rear end area of ​​the arch expander body 21 to improve patient wearing comfort.

[0421] When the expanding portion 20 includes a reinforcing rib 22 disposed near the rear end edge 214, the reinforcing rib 22 is also recessed toward the front end edge 213, so that the reinforcing rib 22 can fit the recessed rear end edge 214.

[0422] Optionally, referring to Figures 28 to 30, the tooth engagement portion 10 includes a buccal surface 12 disposed corresponding to the buccal surface of the tooth.

[0423] When the expander 100 is in the wearing state, the buccal side 12 includes a handle portion 40 that protrudes toward the buccal gingival line S'.

[0424] At least a portion of the bottom edge 121 of the buccal side 12 lies below the buccal gingival line S'.

[0425] A handle portion 40 is formed between the bottom edge 121 below the buccal gingival line S' and the buccal gingival line S'.

[0426] The handle 40 facilitates the application of an upward external force at the bottom edge 121 of the buccal side 12 to disengage the dental engagement 10 from the tooth.

[0427] Optionally, when the expander 100 is in the wearing state, the handle 40 is pressed against the gums.

[0428] Alternatively, referring to Figure 28, there is a gap Q2 between the handle 40 and the gum, and the gap Q2 is within a range of no more than 0.5 mm in the left-right direction Y.

[0429] Optionally, referring to FIG29, the bottom edge 121 of the cheek side 12 includes a first bottom edge 1211 and a second bottom edge 1212 connected together.

[0430] The first bottom edge 1211 corresponds to the buccal gingival line S'.

[0431] The second bottom edge 1212 corresponds to the adjacent tooth space R.

[0432] The interdental space R is the area between two adjacent teeth.

[0433] The handle portion 40 includes the second bottom edge 1212.

[0434] Assuming that the original bottom edge 121 matches the buccal gingival line S', the bottom edge 121 at the adjacent tooth gap R can be stretched downward to form a second bottom edge 1212, which deviates from the buccal gingival line S'.

[0435] The extended area formed by stretching downwards can form the handle part 40.

[0436] The other bottom edges 121 are not stretched and still match the buccal gingival line S'. The unstretched bottom edges 121 serve as the first bottom edge 1211.

[0437] The second bottom edge 1212 can be roughly on the same straight line as the first bottom edge 1211.

[0438] The lower edge 41 of the handle 40 (i.e., the second bottom edge 1212) is flush with the line.

[0439] Optionally, referring to Figure 30, the lower edge 41 of the handle 40 is located below the buccal gingival line S'.

[0440] The handle 40 is located entirely below the buccal gingival line S'.

[0441] Optionally, referring to Figures 31 and 32, the tooth junction 10 includes a tooth hole 11 for receiving a tooth.

[0442] The tooth hole 11 includes the first tooth hole 111.

[0443] When the expander 100 is in the wearing state, the first tooth hole 111 is fitted onto the first tooth T1' and at least does not contact the lingual surface T11' of the first tooth T1'.

[0444] When the first foramen 111 does not contact the lingual surface T11' of the first tooth T1', the arch-expanding force transmitted to the first foramen 111 will not be further transmitted to the first tooth T1', and the first tooth T1' can be a tooth that does not require arch-expanding force.

[0445] Alternatively, the first foramen T1' corresponds to the edentulous area.

[0446] "Edgeless area" refers to a tooth position where no tooth exists, and the arch expansion force transmitted to the first foramen 111 will not be further transmitted to that tooth position.

[0447] The placement of the first foramen 111 prevents the expansion force from being transmitted to teeth that do not require expansion force.

[0448] Below, we will introduce several specific examples of the first dental foramen 111, taking the example that the first dental foramen 111 does not contact the lingual surface T11' of the first tooth T1'.

[0449] In the first specific example, referring to FIG31, the first tooth foramen 111 includes a first lingual side 1111 that connects to the arch expander 20.

[0450] When the expander 100 is in the wearing state, the first tooth hole 111 is fitted onto the first tooth T1', and there is a gap Q3 between the first lingual surface 1111 and the lingual surface T11' of the first tooth T1'.

[0451] The gap Q3 is designed so that the first tooth foramen 111 does not contact the lingual surface T11' of the first tooth T1', thus preventing the expansion force from being transmitted to the first tooth T1'.

[0452] Optionally, the first tooth foramen 111 may also include a first buccal surface 1112 disposed opposite to the first lingual surface 1111 and / or a first occlusal surface 1113 connected to the first lingual surface 1111.

[0453] Figure 31 shows an example of a first dental foramen 111 including a first lingual surface 1111, a first occlusal surface 1113, and a first buccal surface 1112 connected in sequence. This can improve the limiting effect between the first dental foramen 111 and the first tooth T1', thereby improving the stability of the arch expander 100 in conjunction with the maxillary teeth.

[0454] The first occlusal surface 1113 can contact the occlusal surface T13' of the first tooth T1'.

[0455] Alternatively, there may be a gap between the first occlusal surface 1113 and the occlusal surface T13' of the first tooth T1'.

[0456] The first buccal side 1112 can contact the buccal side T12' of the first tooth T1'.

[0457] Alternatively, there may be a gap between the first buccal surface 1112 and the buccal surface T12' of the first tooth T1'.

[0458] Figure 32 is a schematic diagram of the first tooth hole 111 in the second specific example. For ease of explanation, the same or similar parts in the second specific example and the first specific example are numbered the same or similarly.

[0459] In the second specific example, the first tooth hole 111' includes a side wall 1114' and a gap Q4 located between the side wall 1114' and the arch expander 20.

[0460] The missing part Q4 refers to the area where the first tooth hole 111' is hollowed out.

[0461] When the expander 100 is in the wearing state, the first tooth hole 111' is fitted onto the first tooth T1'.

[0462] The vacancy Q4 corresponds at least to the lingual surface T11' of the first tooth T1', that is, the vacancy Q4 exposes at least part of the lingual surface T11' of the first tooth T1'.

[0463] The vacancy Q4 ensures that the first tooth foramen 111' does not contact the lingual surface T11' of the first tooth T1', thus preventing the expansion force from being transmitted to the first tooth T1'.

[0464] Optionally, the lateral wall 1114' includes a first buccal side 1112' and / or a first occlusal surface 1113'.

[0465] Figure 32 shows an example of the first tooth hole 111' including the connected first buccal surface 1112' and the first occlusal surface 1113'. This can improve the limiting effect of the first tooth hole 111' and the first tooth T1', thereby improving the stability of the arch expander 100 in conjunction with the maxillary teeth.

[0466] The space between the first occlusal surface 1113' and the arch expander 20 is a gap Q4, and the first tooth foramen 111' only covers the occlusal surface T13' and the buccal surface T12' of the first tooth T1'.

[0467] The first occlusal surface 1113' can contact the occlusal surface T13' of the first tooth T1'.

[0468] Alternatively, there may be a gap between the first occlusal surface 1113' and the occlusal surface T13' of the first tooth T1'.

[0469] The first buccal side 1112' can contact the buccal side T12' of the first tooth T1'.

[0470] Alternatively, there may be a gap between the first buccal surface 1112' and the buccal surface T12' of the first tooth T1'.

[0471] Optionally, referring to Figure 33, the tooth hole 11 also includes a second tooth hole 112.

[0472] When the expander 100 is in the wearing state, the second tooth hole 112 is fitted onto the second tooth T2' and at least contacts the lingual surface T21' of the second tooth T2'.

[0473] When the second foramen 112 contacts the lingual surface T21' of the second tooth T2', the arch-expanding force transmitted to the second foramen 112 can be further transmitted to the second tooth T2', which can be a tooth that requires arch-expanding force.

[0474] The second foramen 112 allows the expansion force to be transmitted to the tooth position that requires expansion force.

[0475] By rationally arranging the first foramen 111 and the second foramen 112, the expansion force can be transmitted only to the teeth that require expansion force, thus avoiding unnecessary displacement of teeth that do not require expansion force.

[0476] Optionally, the second tooth hole 112 includes at least a second lingual surface 1121 that connects to the arch expander 20.

[0477] When the arch expander 20 is in the wearing state, the second lingual surface 1121 contacts and applies force to the lingual surface T21' of the second tooth T2', thereby transmitting the arch expander force to the second tooth T2'.

[0478] Optionally, the second tooth foramen 112 may also include a second buccal surface 1122 disposed opposite to the second lingual surface 1121 and / or a second occlusal surface 1123 connected to the second lingual surface 1121.

[0479] Figure 33 shows an example of a second dental foramen 112 including a second lingual surface 1121, a second occlusal surface 1123, and a second buccal surface 1122 connected in sequence. This can improve the limiting effect of the second dental foramen 112 and the second tooth T2', thereby improving the stability of the arch expander 100 in conjunction with the maxillary teeth.

[0480] When the expander 100 is in the wearing state, the second buccal surface 1122 contacts the buccal surface T22' of the second tooth T2', and / or the second occlusal surface 1123 contacts the occlusal surface T23' of the second tooth T2'.

[0481] Figure 33 shows an example where the second buccal surface 1122 contacts the buccal surface T22' of the second tooth T2', and the second occlusal surface 1123 contacts the occlusal surface T23' of the second tooth T2'.

[0482] In other specific examples, the second buccal surface 1122 may have a gap between it and the buccal surface T22' of the second tooth T2', and the second occlusal surface 1123 may have a gap between it and the occlusal surface T23' of the second tooth T2'.

[0483] Optionally, referring to Figure 34, the first tooth hole 111 and the second tooth hole 112 are arranged adjacent to each other, and the first tooth hole 111 and the second tooth hole 112 are located in the same tooth junction 10.

[0484] For example, the first tooth hole 111 is the fourth tooth hole of the left tooth junction 10, and the second tooth hole 112 is the fifth tooth hole of the left tooth junction 10.

[0485] Optionally, referring to Figure 34, the first tooth hole 111 and the second tooth hole 112 correspond to the same tooth holes on the left and right sides, respectively, and the first tooth hole 111 and the second tooth hole 112 are located at the junction of the two teeth 10.

[0486] For example, the first tooth hole 111 is the fourth tooth hole of the left tooth junction 10, and the second tooth hole 112 is the fourth tooth hole of the right tooth junction 10.

[0487] Optionally, in conjunction with Figures 35 and 36, the tooth engagement portion 10 may also include an accessory receiving cavity S2.

[0488] When the expander 100 is in the wearing state, the accessory receiving cavity S2 is set to correspond to the buccal surface of the tooth.

[0489] The accessory cavity S2 is formed by the buccal bulge 101 surrounding the tooth junction 10.

[0490] When the expander 100 is in the wearing state, the accessory receiving cavity S2 cooperates with the accessory 50 on the tooth surface to prevent the tooth joint 10 from detaching from the tooth.

[0491] Optionally, the accessory receiving cavity S2 is located in the first tooth hole 111 and / or the second tooth hole 112.

[0492] The present invention also provides a design method for a digital bow expander 500.

[0493] Referring to Figures 37 to 39, the design method of the digital bow expander 500 includes the following steps:

[0494] Step S1: Obtain a digital model 300 with palate E1 and at least one reference region E11 located at palate E1.

[0495] The reference region E11 extends roughly along the left-right direction Y.

[0496] Step S3: Obtain the target region 400 that deviates from the reference region E11. The target region 400 includes only the target region body 401, or the target region 400 includes the target region body 401 and the digital reinforcing rib 402 located in the target region body 401.

[0497] The target area body 401 corresponds to the aforementioned expanding bow body 21, and the digital reinforcing rib 402 corresponds to the aforementioned reinforcing rib 22.

[0498] Step S5: Determine whether the total rigidity of the target area 400 meets the first preset condition. The first preset condition includes: the absolute value of the difference between the total rigidity 400 and the first preset value is not greater than the first threshold.

[0499] The first threshold can be a small value. "The absolute value of the difference between the total rigidity 400 and the first preset value is not greater than the first threshold" means that the total rigidity 400 is relatively close to the first preset value.

[0500] Step S7: When the first preset condition is not met, adjust the target area 400 until the total rigidity meets the first preset condition.

[0501] Step S9: Generate a digital bow expander 500 based on the target area 400.

[0502] In this embodiment, a first preset value can be designed based on the arch expansion force required for arch expansion correction, and then the total rigidity of the target area 400 can be adjusted to meet the first preset condition in order to meet the arch expansion requirements.

[0503] Optionally, in conjunction with Figures 40 and 41, the design method may also include the following steps:

[0504] Step S41: Determine whether the target region body 401 meets the second preset condition.

[0505] The second precondition includes at least one of the following:

[0506] The first gap U1 in the vertical direction Z between the lowest point 4011 of the target area body 401 and the reference area E11 is not less than the second preset value.

[0507] Optionally, the second preset value is 0.5mm, which means that the first gap U1 must be no less than 0.5mm.

[0508] The second gap U2 between the lowest point 4011 of the target area body 401 and the reference surface P in the vertical direction Z is not greater than the third preset value.

[0509] Optionally, the third preset value is 15mm, which means that the second gap U2 should not be greater than 15mm.

[0510] The absolute value of the difference between the rigidity of the target region body 401 and the fourth preset value is not greater than the second threshold.

[0511] Optionally, the second threshold can be a small value. "The absolute value of the difference between the rigidity of the target area body 401 and the fourth preset value is not greater than the second threshold" means that the target area body 401 is relatively close to the fourth preset value.

[0512] The fourth preset value can be designed based on the expansion force required for arch expansion correction.

[0513] The reference plane P is perpendicular to the vertical direction Z and passes through at least part of the gingival line V.

[0514] Step S42: When the second preset condition is not met, adjust the target area body 401 until the second preset condition is met, or add a digital reinforcing rib 402 to the target area body 401.

[0515] For example, when acquiring the target area 400, the degree to which the target area 400 deviates from the reference area E11 can be controlled according to the second preset value and the third preset value.

[0516] Step S43: When the second preset condition is met, determine whether the total rigidity of the target area 400 meets the first preset condition.

[0517] The judgment of the first preset condition and the second preset condition are not absolutely sequential, and may include the following situations:

[0518] In the first scenario, it can be determined whether the target region body 401 meets the second preset condition.

[0519] If the condition is not met, the first gap U1 is adjusted to meet the second preset condition that "the first gap U1 between the lowest point 4011 of the target area body 401 and the reference area E11 in the vertical direction Z is not less than the second preset value".

[0520] Alternatively, the second gap U2 can be adjusted to satisfy the second preset condition that "the second gap U2 between the lowest point 4011 of the target area body 401 and the reference surface P in the vertical direction Z is not greater than the third preset value".

[0521] Alternatively, a digital reinforcing rib 402 may be added to the target area body 401 to satisfy the second preset condition that "the absolute value of the difference between the rigidity of the target area body 401 and the fourth preset value is not greater than the second threshold".

[0522] Then, determine whether the target area 400 meets the first preset condition.

[0523] In the second scenario, it can be determined first whether the target area 400 meets the first preset condition.

[0524] If the first preset condition is not met, it can be determined whether the target area body 401 meets the second preset condition.

[0525] If the second preset condition is met, adjust the target area body 401 and / or digital reinforcing rib 402 until the first preset condition is met.

[0526] If the second preset condition is not met, then adjust according to the first scenario mentioned above before determining whether the first preset condition is met.

[0527] Optionally, referring to Figure 42, when the first preset condition is not met, step S7 may include:

[0528] Step S71: Adjust the first design parameters of the target area body 401, and / or adjust the second design parameters of the digital reinforcing rib 402.

[0529] The first design parameter is used to adjust the rigidity of the target area body 401, and the second design parameter is used to adjust the rigidity of the digital reinforcing rib 402, thereby adjusting the overall rigidity of the target area 400.

[0530] When the target area 400 includes only the target area body 401, the first design parameters can be adjusted until the first preset condition is met.

[0531] When the target area 400 includes both the target area body 401 and the digital reinforcing rib 402, the first design parameters and / or the second design parameters can be adjusted until the second preset condition is met.

[0532] The first design parameters include at least one of the following: the first gap U1 between the target area body 401 and the reference area E11, the elastic modulus of the material of the target area body 401, and the thickness of the target area body 401.

[0533] The second design parameter includes at least one of the following:

[0534] The total volume of the digital reinforcing rib 402 is defined as the volume formed by the outer contour of the digital reinforcing rib 402.

[0535] The length of the digital reinforcing rib 402 in the left-right direction Y is the length formed by the outer contour of the digital reinforcing rib 402.

[0536] The height of the digital reinforcing rib 402 in the vertical direction Z is the height formed by the outer contour of the digital reinforcing rib 402.

[0537] The width of the digital reinforcing rib 402 in the front-to-back direction X is the width formed by the outer contour of the digital reinforcing rib 402.

[0538] The moment of inertia of the digital stiffener 402 in the front-rear direction X is the moment of inertia of the cross section formed by the digital stiffener 402 in the front-rear direction X.

[0539] The elastic modulus of the material of the digital reinforcing rib 402 is the elastic modulus of the material used when generating the reinforcing rib 22 based on the digital reinforcing rib 402.

[0540] The thickness of the digital reinforcing rib 402.

[0541] The quantity of digital reinforcing ribs 402.

[0542] Optionally, when adjusting the second design parameter, referring to Figure 43, the design method includes:

[0543] Step S711: Adjust the height of the digital reinforcing rib 402.

[0544] Step S712: When the third gap U3 between the highest point 4021 of the digital reinforcing rib 402 and the reference surface P is less than the fifth preset value, reduce the height and adjust other second design parameters.

[0545] The fifth preset value can be in the range of 5mm-7mm.

[0546] When the third gap U3 is less than the fifth preset value, it is determined that the digital reinforcing rib 402 is too close to the reference surface P. At this time, the height needs to be reduced and the rigidity of the digital reinforcing rib 402 needs to be adjusted by adjusting other second design parameters.

[0547] Optionally, the number of digital stiffeners 402 is given lower priority than other second design parameters.

[0548] When adjusting the rigidity of the digital reinforcing rib 402 by adjusting the second design parameters, other second design parameters besides the number of digital reinforcing ribs 402 can be adjusted first. If adjusting other design parameters still cannot meet the rigidity requirements of the digital reinforcing rib 402, the number of digital reinforcing ribs 402 can be adjusted.

[0549] Optionally, the cross-sectional moment of inertia, height, and / or width of the digital stiffener 402 decrease in the direction from the center of the digital stiffener 402 to the left or right, as can be seen in the description of the aforementioned stiffener 22.

[0550] Optionally, referring to Figure 44, step S3 specifically includes:

[0551] Step S31: Obtain the first reference region E12.

[0552] The first anterior dividing line E121 of the first reference region E12 connects the mesial ends of the left and right M-number teeth, and the first posterior dividing line E122 of the first reference region E12 connects the distal ends of the left and right M-number teeth.

[0553] Step S32: Obtain the second reference region E13 located behind the first reference region E12.

[0554] The second anterior dividing line E131 of the second reference region E13 connects the proximal ends of the left and right N-forams, and the second posterior dividing line E131 of the second reference region E13 connects the distal ends of the left and right N-forams.

[0555] Where M and N are different positive integers.

[0556] Step S33: Obtain the first target region 4011 that deviates from the first reference region E12 and the second target region 4012 that deviates from the second reference region E13.

[0557] The first target area 4011 corresponds to the generation of the aforementioned first bow expander 201, and the second target area 4012 corresponds to the generation of the aforementioned first bow expander 202.

[0558] Optionally, the first preset values ​​corresponding to the first target area 4011 and the second target area 4012 are equal, and the total rigidity of the first target area 4011 and the second target area 4012 can be adjusted to be approximately equal.

[0559] Alternatively, if the first preset values ​​corresponding to the first target area 4011 and the second target area 4012 are not equal, the two first preset values ​​can be adjusted by referring to the ratio range of the total rigidity of the first expansion section 201 and the second expansion section 202.

[0560] Optionally, tooth position M is tooth position 3 or 4, and tooth position N is tooth position 5 or 6.

[0561] Optionally, the adjustments to the first target region 4011 and the second target region 4012 satisfy the following:

[0562] The first target area 4011 does not include the digital reinforcing rib 402, while the second target area 4012 includes the digital reinforcing rib 402.

[0563] Alternatively, the first target area 4011 includes a first digital reinforcing rib 4021, and the second target area 4012 includes a second digital reinforcing rib 4022, wherein the rigidity of the first digital reinforcing rib 4021 is less than the rigidity of the second digital reinforcing rib 4022.

[0564] In this way, the additional expanding force in the subsequently formed first expanding section 201 is less than the additional expanding force in the second expanding section 202, as can be seen from the foregoing description.

[0565] Optionally, the first target region 4011 includes the first target region body 4013, and the second target region 4012 includes the second target region body 4014.

[0566] The first target region body 4013 generates the aforementioned first region A1, and the second target region body 4014 generates the aforementioned second region A2.

[0567] The adjustment of the first target region 4011 and the second target region 4012 satisfies the following condition: the rigidity of the first target region body 4013 is greater than the rigidity of the second target region body 4014.

[0568] In this way, the basic bow-expanding force of the first region A1 that is formed later is greater than the basic bow-expanding force of the second region A2. For details, please refer to the above explanation.

[0569] Optionally, the maximum distance between the first reference region E12 and the reference plane P is less than the maximum distance between the second reference region E13 and the reference plane P.

[0570] The maximum distance between the first reference region E12 and the reference plane P corresponds to the aforementioned first maximum distance G1.

[0571] The maximum distance between the second reference region E13 and the reference plane P corresponds to the aforementioned second maximum distance G2.

[0572] Optionally, the adjustment of the first target region 4011 and the second target region 4012 satisfies the following: the maximum distance between the first target region body 4013 and the reference surface P is less than the maximum distance between the second target region body 4014 and the reference surface P.

[0573] The maximum distance between the first target region body 4013 and the reference plane P corresponds to the aforementioned third maximum distance H1.

[0574] The maximum distance between the second target region body 4014 and the reference plane P corresponds to the aforementioned fourth maximum distance H2.

[0575] Optional design methods include:

[0576] Adjust the distance between the end of the digital reinforcing rib 402 and the edge of the target area body 401 in the left-right direction Y according to the demolding rigidity.

[0577] This spacing corresponds to the distance between the endpoint of the aforementioned reinforcing rib 22 and the boundary line L. The relationship between this spacing and the demolding rigidity can be referred to the aforementioned description.

[0578] Optionally, referring to Figure 45, step S9 specifically includes:

[0579] Step S91: Generate the digital arch expander 501 of the palate E corresponding to the digital model 300 based on the target region 401.

[0580] The digital bow expander 501 generates the aforementioned bow expander 20.

[0581] Step S92: Obtain the two digital tooth junctions 502 of the left and right teeth and the right tooth of the corresponding digital model 300.

[0582] The digital tooth joint 502 corresponds to the aforementioned tooth joint 10.

[0583] Step S93: Combine the digital arch expander 501 and the digital dental engagement 502 to form a digital arch expander 500.

[0584] The digital bow expander 500 generates the aforementioned bow expander 100, which includes a bow expander 20 and two tooth engagement parts 10.

[0585] Referring to Figure 46, this embodiment of the invention also provides a method for molding a bow spreader 100, comprising:

[0586] The digital bow expander 500 is obtained according to the design method of the digital bow expander 500;

[0587] Generate a bow expander 100 corresponding to the digital bow expander 500.

[0588] Optionally, the molding method includes:

[0589] Generate a physical dental model that matches the digital expander 500.

[0590] A hot-pressed film is applied to a solid dental model to generate an expander 100 corresponding to a digital expander 500.

[0591] A solid dental model can be generated first, and then the expander 100 can be formed by traditional hot pressing molding process.

[0592] Optionally, the molding method includes:

[0593] Based on the digital bow expander 500, the bow expander 100 is generated by printing.

[0594] The bow expander 100 can be directly generated through 3D printing.

[0595] The present invention provides a bow expander 100, which is obtained according to the aforementioned bow expander 100 molding method.

[0596] Referring to Figure 47, an embodiment of the present invention provides an apparatus 600 for designing a digital bow expander 500, comprising:

[0597] The first module 61 is used to acquire a digital model 300 with the palate E1 and at least one reference region E11 located at the palate E1.

[0598] The second module 62 is used to obtain the target region 400 that deviates from the reference region E11. The target region 400 includes only the target region body 401, or the target region 400 includes the target region body 401 and the digital reinforcing rib 402 located on the target region body 401.

[0599] The third module 63 is used to determine whether the total rigidity of the target area 400 meets the first preset condition. The first preset condition includes: the absolute value of the difference between the total rigidity 400 and the first preset value is not greater than the first threshold.

[0600] Module 64: When the first preset condition is not met, adjust the target area 400 until the total rigidity meets the first preset condition.

[0601] The fifth module 65 generates a digital bow expander 500 based on the target area 400.

[0602] The purpose of the device 600 can also be configured based on the design method of the digital bow expander 500 in any of the aforementioned technical solutions. Specifically, based on the relationship between the steps, the relevant steps can be implemented in the same or different modules.

[0603] The aforementioned device or its modules and units can be implemented by computer chips or physical entities, or by products with corresponding functions. While the device is described in terms of multiple modules, in other embodiments, the functions of the modules can be implemented in one or more software or hardware components.

[0604] This invention provides a storage medium, which may specifically be a computer-readable storage medium. The storage medium can be installed in a computer and store an application program. In this case, the storage medium can be any available medium that the computer can access data, or it can be a storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium such as a floppy disk, hard disk, or magnetic tape; an optical medium such as a DVD (Digital Video Disc); or a semiconductor medium such as an SSD (Solid State Disk).

[0605] When the application is executed, it implements the steps of any of the technical solutions of the design method of the aforementioned digital bow expander 500.

[0606] The present invention provides an electronic device, which may be a computer, mobile phone, tablet computer, etc. The present invention does not limit the specific type of electronic device.

[0607] The electronic device includes at least one processor, at least one memory, and a communication bus. The at least one processor and at least one memory communicate with each other via the communication bus.

[0608] The communication bus can include any number of buses and bridge circuits. In some implementations, in addition to connecting the processor and memory, the communication bus can also be used to connect peripheral devices or other peripheral circuits.

[0609] The memory is used to store application programs.

[0610] The processor is used to implement any of the technical solutions of the aforementioned design method for the digital bow expander 500 when executing the application program stored in the memory.

[0611] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0612] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bow expander, characterized in that, The device includes two dental joints and an arch expander connecting the two dental joints. The arch expander includes an arch expander body and at least one reinforcing rib connecting the arch expander body. The arch expander body includes a first region and at least one second region distributed along the front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right foramina 4 of the two dental joints. The first rear edge line of the first region connects to the distal ends of the left and right foramina 4. The second front edge line of the second region connects to the mesial ends of the left and right foramina N of the two dental joints. The second rear edge line of the second region connects to the distal ends of the left and right foramina N. The foramina N is foramina 5 or foramina 6. At least one reinforcing rib is located in the second region and not in the first region, or at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

2. The bow expander according to claim 1, characterized in that, The bow expander body includes two second regions, which correspond to the No. 5 and No. 6 tooth holes, respectively.

3. A bow expander, characterized in that, The device includes two dental sutures and an arch expander connecting the two dental sutures. The arch expander includes an arch expander body and at least one reinforcing rib connecting the arch expander body. The arch expander body includes a first region and a second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two dental sutures. The first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two dental sutures. The second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. Wherein, M and N are different positive integers. When the expander is worn, there is a first maximum distance between the palatal tissue corresponding to the first region and the reference surface, and a second maximum distance between the palatal tissue corresponding to the second region and the reference surface. The first maximum distance is less than the second maximum distance. The reference surface is perpendicular to the vertical direction and passes through the junction area between the expander and the two tooth joints. At least one reinforcing rib is located in the second region and not in the first region, or at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

4. A bow expander, characterized in that, The device includes two dental sutures and an arch expander connecting the two dental sutures. The arch expander includes an arch expander body and at least one reinforcing rib connecting the arch expander body. The arch expander body includes a first region and a second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two dental sutures. The first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two dental sutures. The second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. Wherein, M and N are different positive integers. The first region has a third maximum spacing with respect to the reference surface, and the second region has a fourth maximum spacing with respect to the reference surface. The third maximum spacing is less than the fourth maximum spacing. The reference surface is perpendicular to the vertical direction and passes through the junction area of ​​the arch expander and the two tooth joints. At least one reinforcing rib is located in the second region and not in the first region. Alternatively, at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

5. The bow expander according to claim 3 or 4, characterized in that, M-type hole corresponds to hole 3 or 4, and N-type hole corresponds to hole 5 or 6.

6. A bow expander, characterized in that, The device includes two dental sutures and an arch expander connecting the two dental sutures. The arch expander includes an arch expander body and at least one reinforcing rib connected to the arch expander body. The arch expander body includes a first region and a second region distributed along a front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two dental sutures. The first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two dental sutures. The second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. At least one reinforcing rib is located in the first region and / or the second region. The arch expander includes a first arch expander corresponding to the first region and a second arch expander corresponding to the second region. The ratio of the total rigidity of the first arch expander to the total rigidity of the second arch expander is in the range of 1 / 2-2, where M and N are different positive integers.

7. The bow expander according to claim 6, characterized in that, The ratio of the total rigidity of the first bow expansion section to the total rigidity of the second bow expansion section is in the range of 2 / 3 to 3 / 2.

8. The bow expander according to claim 6, characterized in that, The total rigidity of the first bow expansion section is approximately equal to the total rigidity of the second bow expansion section.

9. The bow expander according to claim 6, characterized in that, M is one of the holes from 3 to 6, and N is the other one of the holes from 3 to 6.

10. The bow expander according to claim 6, characterized in that, At least one reinforcing rib is located in the second region and not in the first region, or at least one reinforcing rib is located in both the first region and the second region, and the total rigidity of the reinforcing ribs in the first region is less than the total rigidity of the reinforcing ribs in the second region.

11. The bow expander according to any one of claims 1-10, characterized in that, The first front edge line, the first rear edge line, the second front edge line, or the second rear edge line passes through at least one reinforcing rib.

12. The bow expander according to any one of claims 1-10, characterized in that, At least one reinforcing rib includes a first reinforcing rib located in a first region and a second reinforcing rib located in a second region. The first reinforcing rib and the second reinforcing rib satisfy at least one of the following: the total volume of the first reinforcing rib is less than the total volume of the second reinforcing rib; the maximum length of the first reinforcing rib in the left-right direction is less than the maximum length of the second reinforcing rib in the left-right direction; the maximum height of the first reinforcing rib in the vertical direction is less than the maximum height of the second reinforcing rib in the vertical direction; the maximum width of the first reinforcing rib in the front-back direction is less than the maximum width of the second reinforcing rib in the front-back direction; the maximum moment of inertia of the first reinforcing rib in the front-back direction is less than the maximum moment of inertia of the second reinforcing rib in the front-back direction; the average thickness of the first reinforcing rib is less than the average thickness of the second reinforcing rib; and the average elastic modulus of the first reinforcing rib is less than the average elastic modulus of the second reinforcing rib.

13. The bow expander according to any one of claims 1-10, characterized in that, At least one reinforcing rib includes a first reinforcing rib located in a first region and a plurality of second reinforcing ribs located in a second region, the plurality of second reinforcing ribs being distributed along the front-back direction.

14. The bow expander according to any one of claims 1-10, characterized in that, At least one reinforcing rib includes a plurality of first reinforcing ribs located in a first region and a plurality of second reinforcing ribs located in a second region, wherein the plurality of first reinforcing ribs and the plurality of second reinforcing ribs are distributed along the front-back direction.

15. The bow expander according to any one of claims 1-10, characterized in that, The total stiffness of the first region is greater than that of the second region.

16. The bow expander according to any one of claims 1-10, characterized in that, The bow expansion section includes a first bow expansion section corresponding to the first region and a second bow expansion section corresponding to the second region, and the ratio of the total rigidity of the first bow expansion section to the total rigidity of the second bow expansion section is in the range of 1 / 2-2.

17. The bow expander according to claim 16, characterized in that, The ratio of the total rigidity of the first bow expansion section to the total rigidity of the second bow expansion section is in the range of 2 / 3 to 3 / 2.

18. The bow expander according to claim 16, characterized in that, The total rigidity of the first bow expansion section is approximately equal to the total rigidity of the second bow expansion section.

19. A bow expander, characterized in that, It includes two tooth joints and an arch expander connecting the two tooth joints. The arch expander includes an arch expander body and a plurality of reinforcing ribs connecting the arch expander body. The plurality of reinforcing ribs include a first reinforcing rib and a second reinforcing rib distributed in a front-rear direction. The first reinforcing rib is located at the front end of the second reinforcing rib, and the total rigidity of the first reinforcing rib is less than the total rigidity of the second reinforcing rib.

20. The bow expander according to claim 19, characterized in that, The first reinforcing rib and the second reinforcing rib satisfy at least one of the following: the total volume of the first reinforcing rib is less than the total volume of the second reinforcing rib; the maximum length of the first reinforcing rib in the left-right direction is less than the maximum length of the second reinforcing rib in the left-right direction; the maximum height of the first reinforcing rib in the vertical direction is less than the maximum height of the second reinforcing rib in the vertical direction; the maximum width of the first reinforcing rib in the front-back direction is less than the maximum width of the second reinforcing rib in the front-back direction; the maximum moment of inertia of the first reinforcing rib in the front-back direction is less than the maximum moment of inertia of the second reinforcing rib in the front-back direction; the average thickness of the first reinforcing rib is less than the average thickness of the second reinforcing rib; and the average elastic modulus of the first reinforcing rib is less than the average elastic modulus of the second reinforcing rib.

21. The bow expander according to claim 19, characterized in that, The arch expander body includes a first region and a second region distributed along the front-rear direction. The first front edge line of the first region connects to the mesial ends of the left and right M-sized foramina of the two teeth. The first rear edge line of the first region connects to the distal ends of the left and right M-sized foramina. The second front edge line of the second region connects to the mesial ends of the left and right N-sized foramina of the two teeth. The second rear edge line of the second region connects to the distal ends of the left and right N-sized foramina. Here, M and N are different positive integers. The first reinforcing rib is located in the first region and the second reinforcing rib is located in the second region; or, the first front edge line or the first rear edge line passes through the first reinforcing rib; or, the second front edge line or the second rear edge line passes through the second reinforcing rib.

22. The bow expander according to claim 21, characterized in that, M is one of the holes from 3 to 6, and N is the other one of the holes from 3 to 6.

23. The bow expander according to claim 21, characterized in that, The total stiffness of the first region is greater than that of the second region.

24. The bow expander according to claim 21, characterized in that, The bow expansion section includes a first bow expansion section corresponding to the first region and a second bow expansion section corresponding to the second region, and the ratio of the total rigidity of the first bow expansion section to the total rigidity of the second bow expansion section is in the range of 1 / 2-2.

25. The bow expander according to claim 24, characterized in that, The ratio of the total rigidity of the first bow expansion section to the total rigidity of the second bow expansion section is in the range of 2 / 3 to 3 / 2.

26. The bow expander according to claim 24, characterized in that, The total rigidity of the first bow expansion section is approximately equal to the total rigidity of the second bow expansion section.

27. The bow expander according to any one of claims 1-26, characterized in that, In the direction from the center of the reinforcing rib toward the tooth joint, the cross-sectional moment of inertia of the reinforcing rib in the front-back direction tends to decrease.

28. The bow expander according to any one of claims 1-26, characterized in that, The reinforcing rib has a first height in the vertical direction, and the first height tends to decrease in the direction from the center of the reinforcing rib toward the tooth joint.

29. The bow expander according to any one of claims 1-26, characterized in that, The reinforcing rib has a first width in the front-back direction, and the first width tends to decrease in the direction from the center of the reinforcing rib toward the tooth joint.

30. The bow expander according to any one of claims 1-26, characterized in that, The reinforcing rib is integrally formed with the body of the bow expansion section, and the reinforcing rib is a hollow structure or a solid structure.

31. A bow expander, characterized in that, It includes two dental junctures and an arch expander connecting the two dental junctures. The arch expander includes an arch expander body, which includes two ends that connect the two dental junctures and a middle portion that connects the two ends. When the arch expander is worn, at least one of the two ends contacts the palatal tissue, and there is a gap between the middle portion and the palatal tissue.

32. The bow expander according to claim 31, characterized in that, There is a boundary line between the body of the expander and the tooth joint. When the expander is worn, the boundary line corresponds to the lingual gingival line, and the area of ​​the end that connects to the boundary line contacts the palatal tissue.

33. The bow expander according to claim 31, characterized in that, When the expander is worn, at least one of the two ends is in contact with the palatal tissue in its entirety, and the entire middle portion has a gap with the palatal tissue.

34. The bow expander according to claim 31, characterized in that, One end has a first length in a first direction, the first length being no more than 6 mm, the first direction being the direction in which one end extends to the middle portion.

35. A bow expander, characterized in that, It includes two dental junctures and an arch expander connecting the two dental junctures. The arch expander includes an arch expander body. When the arch expander is worn, there is a gap between the entire area of ​​the arch expander body and the palatal tissue.

36. The bow expander according to claim 35, characterized in that, There is a boundary line between the body of the expander and the tooth junction. When the expander is worn, the boundary line corresponds to the lingual gingival line.

37. The bow expander according to claim 35, characterized in that, The arch expander body includes two ends that connect to the two tooth junctions and a middle part that connects the two ends. When the arch expander is worn, the gap between the ends and the palatal tissue increases along a first direction, which is the direction in which the corresponding ends extend to the middle part.

38. The bow expander according to claim 37, characterized in that, One end has a first length in a first direction, the first length being no more than 6 mm.

39. The bow expander according to claim 37, characterized in that, When the expander is worn, at least a portion of the gap between the middle portion and the palatal tissue remains unchanged.

40. The bow expander according to any one of claims 1-39, characterized in that, When the expander is worn, the expander body is recessed toward the palatal tissue.

41. The bow expander according to any one of claims 1-39, characterized in that, The thickness of the arch expander body is equal to that of the tooth engagement portion.

42. The bow expander according to any one of claims 1-39, characterized in that, The arch expander body is integrally formed with the two tooth engagement parts, or the arch expander body is detachably connected to the two tooth engagement parts.

43. The bow expander according to any one of claims 1-39, characterized in that, The main body of the arch expander and the two tooth engagement parts are both made of polymer material.

44. The bow expander according to any one of claims 1-39, characterized in that, The bow expander also includes a reinforcing rib connected to the body of the bow expander, the reinforcing rib protruding from the body of the bow expander in a direction away from the gap.

45. The bow expander according to claim 44, characterized in that, The reinforcing rib is integrally formed with the body of the bow expansion section, and the reinforcing rib surrounds and forms a cavity that communicates with the gap, or the reinforcing rib is a solid structure.

46. ​​The bow expander according to claim 44, characterized in that, The arch expander body includes two ends that connect to two dental joints and a middle portion that connects the two ends. There is a boundary line between the arch expander body and the dental joints. The reinforcing rib connects at least to the middle portion. The reinforcing rib extends to the ends but does not extend to the boundary line, or the reinforcing rib does not extend to the ends.

47. The bow expander according to claim 46, characterized in that, The distance between the end point of the reinforcing rib and the boundary line is in the range of 1mm-6mm.

48. The bow expander according to claim 46, characterized in that, The distance between the end point of the reinforcing rib and the boundary line is in the range of 2mm-4mm.

49. The bow expander according to claim 44, characterized in that, The reinforcing ribs are a continuous structure in the left-right direction.

50. The bow expander according to claim 44, characterized in that, In the direction from the center of the reinforcing rib toward the tooth joint, the cross-sectional moment of inertia of the reinforcing rib in the front-back direction tends to decrease.

51. The bow expander according to claim 44, characterized in that, The reinforcing rib has a first height in the vertical direction, and the first height tends to decrease in the direction from the center of the reinforcing rib toward the tooth joint.

52. The bow expander according to claim 44, characterized in that, The reinforcing rib has a first width in the front-back direction, and the first width tends to decrease in the direction from the center of the reinforcing rib toward the tooth joint.

53. The bow expander according to claim 44, characterized in that, The expanding section includes multiple reinforcing ribs spaced apart along the front-to-back direction.

54. The bow expander according to claim 44, characterized in that, The bow-expanding part body has a front end edge and a rear end edge that are arranged opposite to each other in the front-to-back direction, and the reinforcing rib is arranged adjacent to the front end edge or the rear end edge.

55. The bow expander according to any one of claims 1-54, characterized in that, The bow-expanding part body has a front end edge and a rear end edge arranged opposite each other in the front-rear direction. The rear end edge is recessed on the side facing the front end edge. When the bow-expanding part includes a reinforcing rib arranged near the rear end edge, the reinforcing rib is recessed on the side facing the front end edge.

56. The bow expander according to any one of claims 1-54, characterized in that, When the expander is in the wearing state, the vertical distance between the lowest point of the expander body and the palatal tissue is not less than 0.5 mm, the vertical distance between the lowest point of the expander body and the reference surface is not greater than 15 mm, and the reference surface is perpendicular to the vertical direction and passes through the junction area between the expander and the two teeth.

57. The bow expander according to any one of claims 1-54, characterized in that, When the expander is in the wearing state, the two tooth engagement parts are respectively fitted onto the left and right posterior teeth, and the two tooth engagement parts are not fitted onto the anterior teeth.

58. The bow expander according to any one of claims 1-54, characterized in that, When the expander is in the wearing state, the two tooth engagement parts are respectively fitted onto the left posterior teeth and the right posterior teeth, the expander body extends to the anterior teeth, and the expander body does not cover the lingual surface of the anterior teeth.

59. The bow expander according to any one of claims 1-54, characterized in that, When the expander is in the wearing state, the two tooth engagement parts are respectively fitted onto the left posterior teeth and the right posterior teeth, the expander body extends to the anterior teeth, and the expander body covers at least part of the lingual surface of the anterior teeth.

60. The bow expander according to any one of claims 1-54, characterized in that, The bow expander is formed by a hot-press molding process, and the main body of the bow expander is a sheet-like structure.

61. The bow expander according to any one of claims 1-54, characterized in that, The tooth engagement portion includes a buccal side surface corresponding to the buccal surface of the tooth. When the expander is in the wearing state, the buccal side surface includes a handle portion that protrudes towards the buccal gingival line.

62. The bow expander according to claim 61, characterized in that, When the expander is worn, the handle is in close contact with the gums, or there is a gap between the handle and the gums.

63. The bow expander according to claim 61, characterized in that, The bottom edge of the buccal side includes a first bottom edge corresponding to the buccal gingival line and a second bottom edge connecting the first bottom edge and corresponding to the interdental space, and the handle portion includes the second bottom edge.

64. The bow expander according to claim 61, characterized in that, The lower edge of the handle is located below the buccal gingival line.

65. The bow expander according to claim 61, characterized in that, The lower edge of the handle is flush with the line.

66. A bow expander, characterized in that, It includes two tooth joints and an arch expander connecting the two tooth joints. The tooth joints include tooth holes for accommodating teeth. The tooth holes include a first tooth hole. When the arch expander is worn, the first tooth hole is fitted onto the first tooth and at least does not contact the lingual surface of the first tooth, or the first tooth hole corresponds to a edentulous area.

67. The bow expander according to claim 66, characterized in that, The first tooth hole includes a first lingual side surface that connects to the arch expander. When the arch expander is in the wearing state, the first tooth hole is fitted onto the first tooth, and there is a gap between the first lingual side surface and the lingual surface of the first tooth.

68. The bow expander according to claim 67, characterized in that, The first tooth foramen also includes a first buccal surface disposed opposite to the first lingual surface and / or a first occlusal surface connected to the first lingual surface.

69. The bow expander according to claim 66, characterized in that, The first tooth hole includes a sidewall and a gap located between the sidewall and the arch expander. When the arch expander is worn, the first tooth hole is fitted onto the first tooth, and the gap corresponds at least to the lingual surface of the first tooth.

70. The bow expander according to claim 69, characterized in that, The sidewall includes a first buccal side and / or a first occlusal surface.

71. The bow expander according to claim 66, characterized in that, The perforation also includes a second perforation, which, when the expander is in the wearing state, is fitted onto the second tooth and at least contacts the lingual surface of the second tooth.

72. The bow expander according to claim 71, characterized in that, The second tooth foramen includes at least a second lingual surface that connects to the arch expander. When the arch expander is in the wearing state, the second lingual surface contacts and applies force to the lingual surface of the second tooth.

73. The bow expander according to claim 72, characterized in that, The second foramen also includes a second buccal surface disposed opposite to the second lingual surface and / or a second occlusal surface connected to the second lingual surface.

74. The bow expander according to claim 72, characterized in that, When the expander is in the wearing state, the second buccal side contacts the buccal surface of the second tooth, and / or the second occlusal surface contacts the occlusal surface of the second tooth.

75. The bow expander according to claim 71, characterized in that, The first tooth hole and the second tooth hole are arranged adjacent to each other.

76. The bow expander according to claim 71, characterized in that, The first and second tooth holes correspond to the same tooth holes on the left and right sides, respectively.

77. The bow expander according to claim 71, characterized in that, The dental joint also includes an accessory receiving cavity, which cooperates with the accessory on the tooth surface when the expander is worn.

78. The bow expander according to claim 77, characterized in that, The accessory receiving cavity is located in the first tooth foramen and / or the second tooth foramen. When the arch expander is in the wearing state, the accessory receiving cavity is set corresponding to the buccal surface of the tooth.

79. A design method for a digital bow expander, characterized in that... include: Obtain a digital model of the palate and at least one reference region located in the palate; Obtain a target region that deviates from the reference region, wherein the target region includes only the target region body, or the target region includes the target region body and a digital reinforcing rib located on the target region body; Determine whether the total rigidity of the target region meets a first preset condition, the first preset condition including: the absolute value of the difference between the total rigidity and a first preset value is not greater than a first threshold; When the first preset condition is not met, adjust the target area until the total rigidity meets the first preset condition. A digital bow expander is generated based on the target area.

80. The design method according to claim 79, characterized in that, The design method includes: Determine whether the target region body satisfies the second preset condition. The second preset condition includes at least one of the following: the first vertical gap between the lowest point of the target region body and the reference region is not less than the second preset value; the second vertical gap between the lowest point of the target region body and the reference surface is not greater than the third preset value; and the absolute value of the difference between the rigidity of the target region body and the fourth preset value is not greater than the second threshold. The reference surface is perpendicular to the vertical direction and passes through at least part of the gingival line. If the second preset condition is not met, adjust the target area body until the second preset condition is met, or add digital reinforcing ribs to the target area body.

81. The design method according to claim 80, characterized in that, The second preset value is 0.5mm, and the third preset value is 15mm.

82. The design method according to claim 80, characterized in that, The design method includes: When the second preset condition is met, determine whether the total rigidity of the target area meets the first preset condition.

83. The design method according to claim 79, characterized in that, The design method includes: The first design parameter of the target region body is adjusted, and the first design parameter includes at least one of the following: the gap between the target region body and the reference region, the elastic modulus of the material of the target region body, and the thickness of the target region body; And / or adjust the second design parameters of the digital reinforcing rib, the second design parameters including at least one of the following: the total volume of the digital reinforcing rib, the length of the digital reinforcing rib in the left-right direction, the height of the digital reinforcing rib in the vertical direction, the width of the digital reinforcing rib in the front-back direction, the section moment of inertia of the digital reinforcing rib in the front-back direction, the material elastic modulus of the digital reinforcing rib, the thickness of the digital reinforcing rib, and the number of digital reinforcing ribs.

84. The design method according to claim 83, characterized in that, The design method includes: Adjust the height of the digital reinforcing ribs; When the third gap between the highest point of the digital reinforcing rib and the reference surface is less than the fifth preset value, the height is reduced and other second design parameters are adjusted, wherein the reference surface is perpendicular to the vertical direction and passes through at least part of the gingival line.

85. The design method according to claim 83, characterized in that, The number of digital stiffeners is given lower priority than other secondary design parameters.

86. The design method according to claim 83, characterized in that, From the center of the digital reinforcing rib, the cross-sectional moment of inertia, height, and / or width of the digital reinforcing rib decrease in either the left or right direction.

87. The design method according to any one of claims 79-86, characterized in that, The design method includes: Obtain a first reference region, the first anterior boundary line of the first reference region connects the mesial ends of the left and right M-number teeth, and the first posterior boundary line of the first reference region connects the distal ends of the left and right M-number teeth. Obtain a second reference region located behind the first reference region. The second anterior boundary line of the second reference region connects the mesial ends of the two N-position teeth on the left and right sides, and the second posterior boundary line of the second reference region connects the distal ends of the two N-position teeth on the left and right sides. Here, M and N are different positive integers. Obtain the first target region that deviates from the first reference region and the second target region that deviates from the second reference region.

88. The design method according to claim 87, characterized in that, The first preset value corresponding to the first target region and the second target region is equal.

89. The design method according to claim 87, characterized in that, M-position corresponds to tooth position 3 or 4, and N-position corresponds to tooth position 5 or 6.

90. The design method according to claim 87, characterized in that, The adjustment of the first target area and the second target area satisfies the following conditions: the first target area does not include digital reinforcing ribs, and the second target area includes digital reinforcing ribs; or, the first target area includes a first digital reinforcing rib, and the second target area includes a second digital reinforcing rib, wherein the rigidity of the first digital reinforcing rib is less than the rigidity of the second digital reinforcing rib.

91. The design method according to claim 87, characterized in that, The first target region includes a first target region body, and the second target region includes a second target region body. The adjustment of the first target region and the second target region satisfies the following condition: the rigidity of the first target region body is greater than the rigidity of the second target region body.

92. The design method according to claim 87, characterized in that, The maximum distance between the first reference region and the reference surface is less than the maximum distance between the second reference region and the reference surface, and the reference surface is perpendicular to the vertical direction and passes through at least part of the gingival line.

93. The design method according to claim 87, characterized in that, The first target region includes a first target region body, and the second target region includes a second target region body. The adjustment of the first target region and the second target region satisfies the following: the maximum distance between the first target region body and the reference surface is less than the maximum distance between the second target region body and the reference surface, and the reference surface is perpendicular to the vertical direction and passes through at least part of the gingival line.

94. The design method according to any one of claims 79-93, characterized in that, The design method includes: Adjust the spacing between the end of the digital reinforcing rib and the edge of the target area body according to the demolding rigidity.

95. The design method according to any one of claims 79-93, characterized in that, The design method includes: A digital palatal arch expander is generated based on the target region, corresponding to the digital model. Obtain two digital tooth junctions corresponding to the left and right teeth and the right tooth of the digital model; The digital arch expander and the digital dental engagement portion are combined to form a digital arch expander.

96. A method for forming a bow expander, characterized in that... include: The digital bow expander is obtained by the design method of the digital bow expander according to any one of claims 79-95; Generate a bow expander corresponding to the digital bow expander.

97. The molding method according to claim 96, characterized in that, The molding method includes: Generate a physical dental model matching the digital expander; A heat-pressed film is applied to a solid dental model to generate an expander corresponding to the digital expander.

98. The molding method according to claim 96, characterized in that, The molding method includes: Based on the digital bow expander, a bow expander is printed to generate a bow expander.

99. A bow expander, characterized in that, The bow expander is obtained by the forming method of the bow expander according to any one of claims 96-98.

100. A device for designing a digital bow expander, characterized in that, include: The first module is used to acquire a digital model of the palate and at least one reference region located in the palate. The second module is used to obtain a target region that deviates from the reference region. The target region includes only the target region body, or the target region includes the target region body and a digital reinforcing rib located on the target region body. The third module is used to determine whether the total rigidity of the target area meets the first preset condition, the first preset condition including: the absolute value of the difference between the total rigidity and the first preset value is not greater than the first threshold. The fourth module adjusts the target area until the total rigidity meets the first preset condition when the first preset condition is not met. The fifth module generates a digital bow expander based on the target area.

101. An electronic device, comprising a processor, a memory, and a communication bus, characterized in that, The processor and the memory communicate with each other via the communication bus; The memory is used to store application programs; The processor is configured to implement the design method of the digital bow expander according to any one of claims 79-95 when executing an application program stored in the memory.

102. A storage medium having an application program stored thereon, characterized in that, When the application is executed, it implements the steps of the design method for the digital bow expander according to any one of claims 79-95.

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