Dental correction device

Abstract

The utility model discloses a dental correction device which comprises a shell-shaped dental appliance and an extraoral arch device, connecting parts and retention parts arranged on the mesial sides of the connecting parts are convexly arranged on the cheek side surfaces of the back tooth areas on the left and right sides of the shell-shaped tooth appliance towards the far tooth direction; an inner bow body of the extra-oral bow device comprises a free section connected with a connecting part and a retention section connected with a retention part; the retention part comprises a containing part and a limiting part adjacent to the containing part, the limiting part is provided with an opening structure, the retention section is pressed into and contained in the containing part through the opening structure in the first direction, and the limiting part limits the retention section to be separated from the retention part; the free section is inserted and contained in the connecting part in the second direction, and when the external arch body is pulled backwards in the sagittal direction, the external oral arch device applies sagittal backward traction force to the shell-shaped tooth appliance, so that teeth contained in the shell-shaped tooth appliance integrally move to the distal part or at least part of rear teeth in the contained teeth move to the distal part; wherein the first direction is different from the second direction.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, more specifically to the field of dental appliances, and particularly to a dental orthodontic device for distal tooth movement. Background Technology

[0002] In orthodontic treatment, some cases, especially those involving distal movement of teeth or posterior teeth, require enhanced anchorage through extraoral anchorage, such as using an extraoral arch appliance. This extraoral arch appliance can be used alone, directly installed on the buccal side of the posterior teeth; or it can be used in conjunction with the increasingly popular shell-type orthodontic appliances, installed on the buccal side of the shell-type appliance's posterior region. Currently, when installing the extraoral arch appliance, the two free ends of the inner arch need to be installed on the buccal side of the posterior region. However, due to the large size of the extraoral arch appliance, installation within the limited space of the patient's mouth, especially in the posterior region, presents significant challenges. Furthermore, since the extraoral arch appliance and shell-type orthodontic appliance are fixed solely by their two installation positions in the posterior region, the installed extraoral arch appliance often fails to maintain the intended position and orientation, causing a deviation between the direction of the applied traction force and the expected traction force. This deviation directly affects the treatment outcome.

[0003] Chinese patent application number CN202322276940.0 discloses a split-type external oral bow, which enables simple and quick installation and disassembly of the external oral bow device. However, the split-type external oral bow is, after all, a specially customized external oral bow, and its clinical application is not yet widespread. At present, the traditional one-piece external oral bow is still more widely used in clinical practice. Therefore, the problem of how to achieve convenient installation of this one-piece external oral bow and how to make it stable in the expected position and direction inside the mouth after installation urgently needs to be solved.

[0004] Based on the above problems, it is particularly important to develop a dental orthodontic device that is simple and quick to install, can effectively stabilize the extraoral bow device, and maintain the direction of traction. Utility Model Content

[0005] The technical problem solved by this utility model is to overcome the defects of the existing technology and provide a dental orthodontic device that combines a shell-shaped dental appliance with an extraoral bow device. This device allows for convenient and quick installation of the extraoral bow device, and the installed device is stable and does not wobble. It can maintain the direction of traction force and thus efficiently achieve distal movement of the entire or part of the posterior teeth.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A dental orthodontic appliance includes: a shell-shaped orthodontic appliance for accommodating a patient's teeth and an extraoral arch device; the shell-shaped orthodontic appliance has connecting portions protruding distally on the buccal surfaces of the posterior tooth regions on both sides, and retention portions disposed on the mesial side of the connecting portions, the retention portions and the connecting portions being disposed at a predetermined distance; the extraoral arch device includes an inner arch body located inside the patient's mouth and substantially consistent with the shape of a dental arch, and an outer arch body connected to the inner arch body located outside the patient's mouth, the inner arch body including a free segment connected to the connecting portions and a retention segment connected to the retention portions, the free segment and the retention segment being connected by a connecting segment; the retention portion includes a receiving portion and a receiving portion connected to the receiving portion. A limiting portion is disposed adjacent to the receiving portion, the limiting portion having an opening structure communicating with a cavity enclosed by the receiving portion, the retaining segment being pressed into and housed within the receiving portion through the opening structure along a first direction, the limiting portion restricting the retaining segment from disengaging from the retaining portion in a direction opposite to the first direction; the free segment is inserted into and housed within the connecting portion along a second direction, and when the external arch body is pulled backward along the sagittal direction, the external arch device applies a sagittal backward traction force to the shell-shaped orthodontic appliance to move the teeth housed by the shell-shaped orthodontic appliance distally or at least a portion of the posterior teeth housed therein distally; wherein the first direction and the second direction are different.

[0008] This application adds a retention part in the mesial direction of the connecting part, thereby increasing the contact points for connecting and installing the extraoral arch device and the shell-shaped orthodontic appliance, ensuring the stability of the extraoral arch device and maintaining the direction of traction force unchanged. At the same time, the structure of the retention part makes the installation direction of the retention segment and the retention part (i.e., the first direction) different from the installation direction of the free end and the connecting part (i.e., the second direction). During installation, the connecting part can be inserted first along the second direction. At this time, the retention segment is already in the position corresponding to the retention part. It is only necessary to press the retention segment in along the first direction. There is no need to continuously insert the inner arch body into the retention part and the connecting part in the oral cavity along the second direction, which reduces the installation difficulty.

[0009] Preferably, the first direction is buccal-lingual or gingival-maxillary, and the second direction is mesiodistal. The retention segment and the free segment are inserted into the retention part and the connecting part in mutually perpendicular directions, forming a spatially staggered locking, which facilitates installation and provides good retention.

[0010] Preferably, the first direction is buccal-lingual, and the opening structure is located on the buccal side of the limiting portion; or, the first direction is gingival-occlusal, and the opening structure is located on the side of the limiting portion near the gingiva or away from the gingiva. This arrangement not only facilitates installation but also allows users (such as doctors) to observe the installation status of the retention segment through the opening structure, improving the efficiency of clinical operations.

[0011] Preferably, the inner contour dimension of the receiving portion is less than or equal to the outer contour dimension of the retention segment, so that the retention segment is fixed within the receiving portion when it is received. The inner contour dimension of the limiting portion is less than the outer contour dimension of the retention segment, so as to prevent the retention segment from detaching from the receiving portion. In particular, when the inner contour dimension of the receiving portion is less than the outer contour dimension of the retention segment, the retention segment undergoes slight elastic deformation when pressed into the receiving portion, forming a tight fit, reducing energy loss caused by micro-movement, and ensuring that the traction force is fully transmitted to the orthodontic appliance.

[0012] Preferably, the outer contour dimension of the retaining segment is the radial dimension of the outer contour cross-section of the retaining segment in a preset direction, and the inner contour dimension of the receiving portion is the radial dimension of the inner contour cross-section of the receiving portion in the preset direction, wherein the preset direction is different from the first direction.

[0013] Preferably, the retaining portion and the connecting portion are at the same height in the gingival-maxillary direction. By limiting the height to be approximately the same, the intraoral arch body is positioned approximately horizontally after installation, and the direction of traction force can be maintained unchanged during traction.

[0014] Preferably, the limiting part includes two elastic pieces, with an opening structure formed between the two elastic pieces. The retaining segment is pressed into the receiving part along the first direction from the opening structure, and the two elastic pieces clamp and limit the retaining segment to prevent it from detaching from the receiving part. With this configuration, the user (e.g., a doctor) can operate with one hand during use. The elastic pieces expand outwards during pressing, and spring back to lock in place after the retaining segment is in position, achieving a "click" installation feedback, improving operational efficiency and providing a more convenient installation method. Furthermore, this elastic piece design allows for the deformation of the elastic pieces to accommodate slightly different outer contour dimensions of the retaining segment, reducing manufacturing precision requirements and enabling adaptation to retaining segments of different sizes.

[0015] Preferably, the retaining portion further includes a guiding portion, which is disposed adjacent to the limiting portion. The inner contour dimension of the guiding portion gradually decreases from the end away from the limiting portion to the end near the limiting portion. The guiding portion is provided to guide the retaining segment into the limiting portion with a smaller inner contour dimension, thus playing a guiding role and avoiding repeated attempts to fit the correct installation position, thereby improving installation efficiency.

[0016] Preferably, the retaining portion is further provided with a limiting cover plate to prevent the retaining segment from detaching from the retaining portion. The limiting cover plate is provided with a first connecting member, and a second connecting member is provided on the side of the retaining portion near its opening end. The limiting cover plate is connected to the retaining portion through the cooperation of the first connecting member and the second connecting member. At least a portion of the edge of the limiting cover plate engages with a portion of the edge of the opening end of the retaining portion, thus securing the retaining segment in the receiving portion. By providing the limiting cover plate for physical closure, the detachment of the retaining segment can be completely prevented.

[0017] Preferably, a mounting portion is provided on the side of the retention portion near the shell-shaped orthodontic appliance, and a mounting hole is provided on the shell-shaped orthodontic appliance at the position corresponding to the retention portion. The mounting portion passes through the mounting hole and is held in place on the inner surface of a portion of the shell-shaped orthodontic appliance around the mounting hole.

[0018] Preferably, the mounting portion includes a main body and a constraint portion; one end of the constraint portion is connected to the main body, the other end of the constraint portion is a free end, the included angle between the constraint portion and the main body is an acute angle, the constraint portion includes a guide end and a constraint end opposite to the guide end, the outer contour dimension of the guide end is less than or equal to the inner contour dimension of the mounting hole, and the outer contour dimension of the constraint end is greater than the inner contour dimension of the mounting hole; during installation, the guide end is inserted into the mounting hole along the first direction, and the constraint end, under the constraint of the mounting hole, converges inward toward the main body to pass through the mounting hole and is held against the inner surface of a portion of the shell-shaped orthodontic appliance around the periphery of the mounting hole. This mounting portion structure and its matching arrangement with the mounting hole ensures that the constraint portion can completely pass through the mounting hole, and that the constraint end can firmly abut against the inner surface of the shell-shaped orthodontic appliance around the periphery of the mounting hole, thereby preventing the retention portion from detaching from the shell-shaped orthodontic appliance.

[0019] Preferably, there are multiple constraint portions, which are spaced apart along the long axis of the main body. The distance between two adjacent constraint portions or the distance between a constraint portion and a retention portion adjacent to the retention portion is greater than or equal to the thickness of the shell-shaped orthodontic appliance around the mounting hole. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same numerical reference numerals are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0021] Figure 1 This is a top view schematic diagram of the dental orthodontic device of this utility model;

[0022] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of a type of retaining part along P-P';

[0023] Figure 3 for Figure 1 A partial cross-sectional schematic diagram of another type of retention part along P-P';

[0024] Figure 4 for Figure 1 A partial cross-sectional schematic diagram of another type of retaining part along P-P';

[0025] Figure 5 for Figure 1 A partial cross-sectional view of a retaining part with a guide along P-P';

[0026] Figure 6 This is a side view of the fixing part with the mounting part provided in this utility model;

[0027] Figure 7 for Figure 6 A partial cross-sectional view of the central retention unit after it has been installed in a shell-shaped orthodontic appliance;

[0028] Figure 8 This is a side view of a retaining part in this utility model that has another type of mounting part.

[0029] Figure 9 for Figure 8 A partial cross-sectional view of the retention portion after the middle mounting section is divided and installed on a shell-shaped orthodontic appliance. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model.

[0031] The directional terms "up," "down," "left," and "right" used in this document refer to the directions shown in the accompanying drawings and do not imply any specific limitation. Unless otherwise explicitly stated or limited, the term "connection" in this document should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part of a structure. It can refer to a direct connection or an indirect connection through an intermediate medium.

[0032] In the various embodiments of this invention, the term "posterior tooth region" is defined according to the classification of teeth in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 36-38. It includes premolars and molars, teeth marked as 4-8 using the FDI notation, and teeth marked as 1-3 using the FDI notation for the anterior tooth region. The teeth in the anterior tooth region include the central incisors, lateral incisors, and canines.

[0033] As described in the background section, currently, when combining extraoral arch devices and shell-shaped orthodontic appliances, the large size of the extraoral arch device makes installation in the limited space of the patient's oral cavity, especially in the posterior region, quite difficult. Furthermore, even after installation, because the extraoral arch device and shell-shaped orthodontic appliance are fixed only by two installation positions in the posterior region, the installed extraoral arch device often cannot be stabilized in the expected position and direction. This causes the direction of the traction force applied by the extraoral arch device to deviate from the expected direction of the traction force, ultimately affecting the treatment effect and efficiency.

[0034] This application provides a dental orthodontic appliance, comprising: a shell-shaped orthodontic appliance for accommodating a patient's teeth and an extraoral arch device; the shell-shaped orthodontic appliance has connecting portions protruding distally on the buccal surfaces of the posterior teeth on both sides of the left and right sides, and retention portions disposed on the mesial side of the connecting portions, the retention portions and the connecting portions being disposed at a predetermined distance; the extraoral arch device includes an inner arch body located inside the patient's mouth and substantially consistent with the shape of the dental arch, and an outer arch body connected to the inner arch body located outside the patient's mouth, the inner arch body including a free segment connected to the connecting portion and a retention segment connected to the retention portion, the free segment and the retention segment being connected by a connecting segment; the retention portion includes a receiving portion and a receiving portion and a retaining portion connected to the receiving portion. A limiting portion is disposed adjacent to the receiving portion, the limiting portion having an opening structure communicating with a cavity enclosed by the receiving portion. The retaining segment is pressed into and housed within the receiving portion through the opening structure along a first direction, and the limiting portion restricts the retaining segment from disengaging from the retaining portion in a direction opposite to the first direction. The free segment is inserted into and housed in the connecting portion along a second direction. When the external arch body is pulled backward along the sagittal direction, the extraoral arch device applies a sagittal backward traction force to the shell-shaped orthodontic appliance to move the teeth housed by the shell-shaped orthodontic appliance distally or at least a portion of the posterior teeth housed therein distally. The first direction and the second direction are different. By setting a retention part in the mesial direction of the connecting part, the retention part increases the contact points for connecting and installing the extraoral arch device and the shell-shaped orthodontic appliance, ensuring the stability of the extraoral arch device and maintaining the direction of traction force unchanged. At the same time, the structure of the retention part makes the installation direction of the retention segment and the retention part (i.e., the first direction) different from the installation direction of the free end and the connecting part (i.e., the second direction), avoiding the difficulty of continuously inserting the internal arch body into the retention part and the connecting part in the oral cavity along the second direction.

[0035] The following will provide a detailed explanation in conjunction with the illustrations.

[0036] Please refer to Figure 1 As shown, the dental orthodontic appliance 100 of this application includes a shell-shaped orthodontic appliance 1 for accommodating the patient's teeth and an extraoral arch device 2; the shell-shaped orthodontic appliance 1 includes a crown receiving cavity for accommodating the patient's teeth, and a connecting part 11 and a retention part 12 are respectively protruding from the buccal side of the posterior tooth area on both the left and right sides of the shell-shaped orthodontic appliance 1 towards the distal teeth, the retention part 12 is located on the mesial side of the connecting part 11, and the retention part 12 and the connecting part 11 are set at a predetermined distance; the extraoral arch device 2 includes an inner arch body 21 located inside the patient's mouth and basically consistent with the shape of the dental arch, and an outer arch body 22 connected to the inner arch body 21 and located outside the patient's mouth; combined with Figure 1As shown, taking the left posterior tooth region as an example, the retention part 12 is located on the buccal side of the crown receiving cavity 10 corresponding to tooth 4 in the left posterior tooth region, and the connecting part 11 is located on the buccal side of the crown receiving cavity 10 corresponding to tooth 6 in the left posterior tooth region. In another embodiment, the retention part 12 can also be located between the crown receiving cavities corresponding to teeth 3 and 4 on the left side, and the connecting part 11 can be located between the crown receiving cavities corresponding to teeth 5 and 6 in the left posterior tooth region; this application does not impose any limitations. It is understood that the setting of the retention part 12 increases the connection and retention points between the inner arch body 21 and the shell-shaped orthodontic appliance 1, thereby enhancing the stability of the extraoral arch device 2. To further explain, when the extraoral arch device 2 is used for traction, its traction point is located outside the mouth. As described in the background art, the traditional connection method of the extraoral arch device 2 results in fewer connection fixation points and a greater distance from the traction point, which easily causes the extraoral arch to wobble in the gingival or buccal-lingual direction, thus causing a deviation in the direction of traction force and hindering the achievement of orthodontic effects. The preset distance setting mentioned in this application is used to limit the distance between the setting position of the retention part 12 and the setting position of the connecting part 11. The larger the preset distance value, the closer the setting position of the retention part 12 is to the anterior tooth area, which not only increases the connection fixation points, but also makes the inner arch body 21 more stable and fixed in the current position when the extraoral arch device 2 is pulled, resulting in better stability. To further explain, the value of the above-mentioned preset distance can be as follows: Figure 1 The value shown is the sum of the tooth width values ​​of tooth #5 and parts of tooth #4 and #6. The specific value can be determined according to the specific case. It is understood that in some implementations, the preset distance can also be 3mm, 5mm, 10mm, etc.

[0037] Further explanation: The inner bow body 21 includes a free section 211 connected to the connecting portion 11 and a retaining section 212 connected to the retaining portion 12. The free section 211 and the retaining section 212 are connected by a connecting section 213. The retaining portion 12 includes a receiving portion 121 and a limiting portion 122 disposed adjacent to the receiving portion 121. The limiting portion 122 has an opening structure 123 communicating with the cavity S enclosed by the receiving portion 121. In use, the retaining section 212 is pressed into and accommodated in the receiving portion along the first direction X through the opening structure 123. Within 121, the limiting part 122 restricts the retention segment 212 from disengaging from the retention part 12 in a direction opposite to the first direction X; the free segment 211 is inserted into and accommodated in the connecting part 11 in the second direction Y; when the external arch body 22 is pulled backward in the sagittal direction, the extraoral arch device 2 applies a sagittal backward traction force to the shell-shaped orthodontic appliance 1, so that the teeth contained in the shell-shaped orthodontic appliance 1 move distally as a whole or at least some of the posterior teeth contained therein move distally; wherein, the first direction X and the second direction Y are different.

[0038] Specifically, such as Figure 1 The second direction Y shown is from mesial to distal. The distal side of the connecting portion 11 is a closed structure, while the mesial side of the connecting portion 11 is an opening. The connecting portion 11 includes a receiving channel capable of accommodating the free segment 211. During installation, the free segment 211 enters through the opening on the mesial side of the connecting portion 11 and continues to be inserted toward the distal side until at least half of the free segment 211 is accommodated in the receiving channel. Preferably, the free segment 211 is completely accommodated in the installation channel, and the end face of the free segment 211 abuts against the bottom wall of the distal side of the connecting portion. This increases the limiting effect of the connecting portion 11 on the inner arch body 21, making the installation of the inner arch body 21 more reliable. Moreover, after insertion, the connecting portion 11 can limit the free segment 211 in directions other than the mesial side. For example, the buccal, lingual, and distal sides are all closed structures, making it difficult for the free segment 211 to detach from the connecting portion 11.

[0039] The first direction X will be described below. In some embodiments, please refer to... Figure 2 and Figure 3As shown, the first direction X is from the buccal side towards the lingual side. The opening structure 123 is located on the buccal side of the limiting part 122, that is, the opening structure 123 opens in the buccal direction. This buccal opening facilitates the user (such as a doctor) to observe the installation of the retention segment 212 from the buccal side, improving the efficiency of clinical operation. That is, during insertion, the outer surface of the retention segment 212 first reaches the buccal side of the retention part 12, and is inserted through the buccal opening structure 123. The inner contour dimension of the limiting part 122 is smaller than the outer contour dimension of the retention section 212. During insertion, the retention section 212 or the limiting part 122 undergoes elastic deformation, allowing the retention section 212 to enter and be accommodated in the receiving part 121 through the limiting part 122. After the retention section 212 is accommodated in the receiving part 121, the limiting part 122 can restrict the retention section 212 from disengaging from the retention part 12 in the direction from the lingual side to the buccal side. Furthermore, the inner contour dimension of the receiving part 121 can be equal to the outer contour dimension of the retention section 212, or the inner contour dimension of the receiving part 121 can be slightly smaller than the outer contour dimension of the retention section 212. When the retention section 212 is pressed into the receiving part 121, it undergoes slight elastic deformation, forming a tight fit, reducing energy loss caused by micro-movement, and ensuring that the traction force can be fully transmitted to the orthodontic appliance. Further explanation: the outer contour dimension of the retaining segment can be the radial dimension of the outer contour cross-section of the retaining segment in a preset direction A, and the inner contour dimension of the receiving portion can be the radial dimension of the inner contour cross-section of the receiving portion in the preset direction A, wherein the preset direction A is different from the first direction X. Figure 2 and Figure 3In the illustrated embodiment, the preset direction A is gingival-occlusal (specifically, from the occlusal surface to the gingiva), and the first direction X is mesiodistal (specifically, from the buccal side to the lingual side). The preset direction A is perpendicular to the first direction X, and the micro-pressure retention effect is optimal at this time. It is understood that in other embodiments, the preset direction A can also be other directions that form a certain angle with the first direction X, such as 30°, 45°, 60°, or other directions that form other angles, which can also fix the retention segment 212 within the retention portion 12. It should be noted that although the inner contour dimension of the receiving portion 121 is smaller than the outer contour dimension of the retaining segment 212, it must satisfy the following condition: the retaining segment 212 can be accommodated within the receiving portion 121. That is, during pressing, whether the retaining segment 212 is pressed into the receiving portion 121 by elastic deformation of either the receiving portion 121 or the retaining segment 212, and after being accommodated in the receiving portion 121, the elastic deformation of either the receiving portion 121 or the retaining segment 212 is not completely restored, but only partially restored. In this way, the retaining segment 212 remains under pressure when accommodated in the receiving portion 121 and will not shake within the cavity S of the receiving portion 121, thus making it more stable. Furthermore, the outer surface of the retaining segment 212 is at least partially in contact with the inner surface of the receiving portion 121. It should be noted that the aforementioned partial contact can mean that the outer surface contour of the retaining segment 212 and the inner surface contour of the receiving portion 121 have the same shape and size, and the outer surface of the retaining segment 212 and the inner surface of the receiving portion 121 are completely in contact; or it can mean that the outer surface contour of the retaining segment 212 and the inner surface contour of the receiving portion 121 have different shapes and sizes, and the outer surface of the retaining segment 212 and the inner surface of the receiving portion 121 are only partially in contact, for example, Figure 2 As shown, the cavity S formed by the inner surface of the accommodating portion 121 has a square cross-sectional shape, while the retaining segment 212 has a circular cross-sectional shape. The outer surface of the retaining segment 212 is tangent to the inner surface of the cavity S. This structural fit can also stably retain the retaining segment 212 within the accommodating portion 121; and so on. Figure 3 As shown, a portion of the inner contour of the accommodating portion 121 has the same shape and size as the outer contour of the corresponding portion of the retaining segment 212 and fits it. The shape of the contour of other portions is not limited, and the retaining segment 212 can be stably fixed in the accommodating portion 121. It is understood that other structural fits are also possible, such that the outer surface of the retaining segment 212 and the inner surface of the accommodating portion 121 can stably fix the retaining segment 212 in the accommodating portion 121 without shaking in the part where they fit together. All such structural fits are possible and this application does not impose any restrictions.

[0040] In another embodiment, please refer to Figure 4 As shown, the first direction X is the direction from the occlusal surface towards the gingiva. The opening structure 123 is disposed on the side of the limiting portion 122 away from the gingiva, that is, the opening structure 123 opens towards the occlusal surface. In this case, the insertion along the first direction X means that, during insertion, the retention segment 212 is inserted from the opening structure 123 towards the occlusal surface towards the direction closer to the gingiva. It can be understood that, in some embodiments, the opening structure 123 may also be disposed on the side of the limiting portion 122 near the gingiva, that is, the opening structure 123 opens towards the gingiva. In this case, the insertion along the first direction X means that, during insertion, the retention segment 212 is inserted from the opening structure 123 towards the gingiva towards the direction closer to the occlusal surface.

[0041] Thus, the setting of the first direction X, which is different from the second direction Y, reduces the difficulty of installing the inner arch body 21 in clinical operation. Specifically, when using the dental orthodontic device 100 of this application, during installation, the free end can be inserted into the connecting part 11 along the mesiodistal direction first. At this time, the retention segment 212 is already in the position corresponding to the retention part 12. Then, the retention segment 212 can be pressed into the retention part 12 along the buccal or lingual or gingival-maxillary direction. This is more convenient than the installation method of sequentially inserting the retention segment 212 and the free segment 211 into the retention part 12 and the connecting part 11 along the mesiodistal direction. Because the retention part 12 is located closer to the anterior tooth region, where the dental arch width is small, in order to insert the inner retention segment 212 into the retention part 12, it is necessary to first use both hands to firmly pinch the left and right sides of the inner arch body 21 during installation so that it can be inserted into the retention part 12; then, after the inner arch body 21 passes through the retention part 12, it still needs to continue to pass through the connecting part 11 located at the distal position of the retention part 12. The inventors found in the experiment that it was difficult to pass through smoothly, which is a very bad experience for users.

[0042] Furthermore, in addition to the setting in the installation direction, this application also sets the height of the retention portion 12 in the gingival-maxillary direction and the height of the connecting portion 11 in the gingival-maxillary direction to be approximately the same. This gingival-maxillary height setting ensures that after the retention segment 212 and the free segment 211 are installed, they can remain essentially horizontal. By limiting the height to be approximately the same, the intraoral arch body 21 is positioned approximately horizontally after installation, maintaining the direction of traction during traction, thereby ensuring the expected treatment effect and efficiency.

[0043] The retaining portion 12 will be further described below. The limiting portion 122 is provided to prevent the retaining segment 212 from detaching from the retaining portion 121 after the retaining segment 212 is housed within the receiving portion 121, thus ensuring stable installation. This application achieves this by setting the inner contour dimension of the limiting portion 122 to be smaller than the outer contour dimension of the retaining segment 212. This application does not impose excessive limitations on the specific structure of the limiting portion 122; any structure that satisfies the aforementioned inventive objective is acceptable. In one embodiment, please refer again to... Figure 3 As shown, the limiting portion may include two elastic sheets 1221, and the opening structure 123 is formed between the two elastic sheets 1221. The retaining segment 212 extends from the opening structure 123 along the first direction X. Figure 3 This illustrates pressing and receiving the retaining segment 212 (from the buccal side to the lingual side) into the receiving portion 121, with the two elastic pieces 1221 clamping and limiting the retaining segment 212 to prevent it from detaching from the receiving portion 121. Further explanation: the opening structure 123 communicates with the cavity S enclosed by the receiving portion 121. In use, the retaining segment 212 is first pressed against the buccal side of the retaining portion 12, and then pressed in along the first direction X (…). Figure 3 The illustration shows the application of force from the buccal side to the lingual side, pressing the retaining segment 212 into the receiving portion 121 of the retaining part 12. This allows the user (such as a doctor) to operate with one hand. During insertion, the elastic piece 1221 expands outwards, and after the retaining segment 212 is in place, the elastic piece 1221 springs back and locks in place, achieving a "click" installation feedback, improving operational efficiency and providing a more convenient installation method. Furthermore, this design of the elastic piece 1221 allows its deformation to accommodate slightly different outer contour dimensions of the retaining segment 212, reducing manufacturing precision requirements and enabling it to adapt to retaining segments 212 of different sizes.

[0044] More preferably, the elastic sheet 1221 has an arc-shaped structure, and the concave direction of the elastic sheet 1221 is consistent with the first direction X. Figure 3 (The diagram illustrates the inward concavity from the buccal side to the lingual side). This design guides the retaining segment 212 as it slides along the first direction X, allowing the retaining part 12 to quickly slide into the receiving part 121, thus facilitating installation.

[0045] For easier installation of the retaining section 212, please refer to... Figure 5As shown, the retaining portion 12 of this application further includes a guiding portion 124, which is disposed adjacent to the limiting portion 122. The inner contour dimension of the guiding portion 124 gradually decreases from the end away from the limiting portion 122 to the end closer to the limiting portion 122. The guiding portion 124 is disposed adjacent to the limiting portion 122 to guide the retaining segment 212 into the limiting portion 122 with a smaller inner contour dimension, thus playing a guiding role and avoiding repeated attempts to fit the correct installation position, thereby improving installation efficiency. During installation, the retaining segment 212 enters from the end of the guiding portion 124 away from the limiting portion 122, where the inner contour dimension of the guiding portion 124 is larger, facilitating the insertion of the retaining segment 212. It should be noted that the inner surface of the guiding portion 124 in this embodiment is planar; in another embodiment, it may also be curved, and this application does not impose any limitations.

[0046] Further explanation: This application also includes a limiting cover 125, which provides physical closure and completely prevents the retaining segment 212 from dislodging. This feature is applicable, for example, to adolescent patients with high activity levels. Please refer to... Figures 6 to 9 As shown, the retaining portion 12 is further provided with a limiting cover plate 125. In this embodiment, the limiting cover plate 125 is disposed adjacent to the limiting portion 122. Specifically, the limiting cover plate 125 is provided with a first connecting member 126, and the retaining portion 122 is provided with a second connecting member 127 near its opening end. The limiting cover plate 125 is connected to the retaining portion 12 through the cooperation of the first connecting member 126 and the second connecting member 127. At least a portion of the edge of the limiting cover plate 125 can be engaged with a portion of the edge of the opening end of the retaining portion 12 to fix the retaining segment 212 in the receiving portion. In section 121; specifically, a first locking member 128 is provided on a portion of the edge of the limiting cover plate 125, and a second locking member 129 is provided on a portion of the edge of the limiting part 122 at a position corresponding to the first locking member 128. When the retaining section 212 enters the receiving part 121, the limiting cover plate 125 is closed, and the first locking member 128 and the second locking member 129 engage in a locking engagement to completely fix the retaining section 212 in the receiving part 121.

[0047] It is understood that when the retaining part 12 is provided with the guide part 124, the limiting cover 125 is disposed adjacent to the guide part 124, and the second connecting member 127 is disposed on the guide part 124.

[0048] To further clarify, the structure and fit of the first connector 126 and the second connector 127 are not the focus of this invention. It is understood that any structure and fit that enables the opening and closing of the limiting cover 125 is acceptable. Of course, in some embodiments, the first connector 126 and the second connector 127 can also be an integral structure, serving as an elastic element. For example, the limiting cover 125 can be connected to the limiting part 122 via this elastic element, thus enabling the opening and closing of the limiting cover 125. In other embodiments, the limiting cover 125 can be configured as a detachable connection, meaning that the first connector 126 and the connector can be connected in a detachable manner. In this way, the limiting cover 125 can be detached as needed, for example, it can be periodically removed for cleaning to avoid food residue buildup and oral hygiene problems.

[0049] The structure and installation method of the retention part 12 and the shell-shaped orthodontic appliance 1 will be described below. In one embodiment, the retention part 12 can be directly bonded to the shell-shaped orthodontic appliance 1 with adhesive, or it can be installed on the shell-shaped orthodontic appliance 1 by welding. In order to make the installation of the retention part 12 more secure, the bottom surface of the retention part 12 adjacent to the shell-shaped orthodontic appliance 1 can be set as an arc-shaped structure consistent with the surface of the shell-shaped orthodontic appliance 1, so that the bottom surface of the retention part 12 and the surface of the shell-shaped orthodontic appliance 1 fit more closely and are more secure after installation. In this way, the structure of the shell-shaped orthodontic appliance 1 is not damaged, but additional adhesive or special welding equipment is required for installation, which limits the installation.

[0050] In some embodiments, a mounting portion 3 is provided on the side of the retention portion 12 near the shell-shaped orthodontic appliance 1. The shell-shaped orthodontic appliance 1 has a mounting hole 13 corresponding to the position of the retention portion 12. The mounting portion 3 passes through the mounting hole 13 and is engaged with a portion of the inner surface of the shell-shaped orthodontic appliance 1 around the mounting hole 13. This method eliminates the need for additional adhesives, avoids the problem of traditional adhesives detaching due to aging, eliminates the need for welding equipment, and prevents damage to the shell-shaped orthodontic appliance 1 during disassembly.

[0051] Further, the mounting part 3 includes a main body part 31 and a constraint part 32; one end of the constraint part 32 is connected to the main body part 31, and the other end of the constraint part 32 is a free end. The included angle α between the constraint part 32 and the main body part 31 is an acute angle. The constraint part 32 includes a guide end 321 and a constraint end 322 opposite to the guide end 321. The outer contour dimension of the guide end 321 is less than or equal to the inner contour dimension of the mounting hole 13, and the outer contour dimension of the constraint end 322 is greater than the inner contour dimension of the mounting hole 13. During installation, the guide end 321 is inserted into the mounting hole 13 along the first direction X, and the constraint end 322 is converging inward toward the main body part 31 under the constraint of the mounting hole 13 to pass through the mounting hole 13 and be held on the inner surface of the shell-shaped orthodontic appliance 1 around the periphery of the mounting hole 13. Specifically, during installation, the guide end 321 of the constraint part 32 first reaches the mounting hole 13, and then the guide end 321 to the constraint end 322 sequentially pass through the mounting hole 13. The constraint part 32 is compressed when passing through the mounting hole 13. Specifically, the included angle α between the constraint part 32 and the main body part 31 can be between 5° and 80°, and in practical applications it can be between 10° and 60°, and further can be 30°, 45°, or 60°. There is a gap between the constraint part 32 and the main body part 31, so that when the constraint part 32 passes through the mounting hole 13, the gap is compressed, and the constraint part 32 converges towards the main body part 31. Furthermore, the outer contour dimension of the guide end 321 is less than or equal to the inner contour dimension of the mounting hole 13, and the outer contour dimension of the constraint end 322 is greater than the inner contour dimension of the mounting hole 13, so that the constraint part 32 can easily enter the mounting hole 13, and after it has completely passed through, the constraint end 322 of the constraint part 32 can abut against the inner surface of a portion of the shell-shaped orthodontic appliance 1 around the mounting hole 13, so as to restrict the mounting part 3 from falling out of the mounting hole 13.

[0052] Further, please see Figure 8 and Figure 9 As shown, the main body 31 may also be provided with a slow-release groove 33. The slow-release groove 33 can provide space for the elastic deformation of the constraint part 32 when the mounting part 3 passes through the mounting hole 13, which is more conducive to the elastic compression of the mounting part 3 when it passes through the mounting hole 13, so that the mounting part 3 can pass through the mounting hole 13 more smoothly.

[0053] Furthermore, in some embodiments, the mounting portion 3 may also be provided with multiple restraint portions 32, which are spaced apart along the long axis Z of the main body portion 31. The distance L1 between two adjacent restraint portions 32 and the distance L2 between the restraint portion 32 and the retention portion 12 must be greater than the thickness of the shell-shaped orthodontic appliance 1 around the mounting hole 13. More preferably, the distance L1 between two adjacent restraint portions 32 and the distance L2 between the restraint portion 32 and the retention portion 12 are equal to the thickness of the shell-shaped orthodontic appliance 1 around the mounting hole 13. This size setting ensures that the restraint portion 32 can completely pass through the mounting hole 13, and the restraint end 322 can be firmly abutted against the inner surface of the shell-shaped orthodontic appliance 1 around the mounting hole 13, thereby preventing the retention portion 12 from detaching from the shell-shaped orthodontic appliance 1. Further explanation: a dividing line (e.g., ...) is provided between adjacent restraint portions 32. Figure 9 As shown in L3 and L4, the dividing line can serve only as an indicator, that is, to instruct the user to separate from this point to retain the desired constraint portion 32, or it can be an easily torn dividing line to facilitate the user in obtaining the desired constraint portion 32. Figure 9 The mounting part 3 shown is for... Figure 8 The mounting section 3 shown is obtained by dividing it at the dividing line labeled L4, retaining only one constraint section 32. The arrangement of multiple constraint sections 32 allows for adjustment of the buccal-lingual height (i.e., the height in the distal direction) of the retention section 212 after installation, ensuring that the buccal-lingual height of the retention section 212 after installation is consistent with the buccal-lingual height of the connecting section 213 after installation.

[0054] Preferably, a mounting platform 14 can also be provided at the position corresponding to the shell-shaped orthodontic appliance 1, please refer to the following for details. Figure 9 As shown, the mounting platform 14 is a bubble structure formed by the shell-shaped orthodontic appliance 1 protruding toward the distal tooth. The mounting hole 13 is provided on the buccal surface of the bubble structure. This arrangement allows the mounting part 3 to be installed through the mounting hole 13, and the portion of the mounting part 3 passing through the mounting hole 13 can be accommodated in the cavity of the bubble structure. This avoids the portion of the mounting part 3 abutting against the surface of the tooth 4 at the corresponding position, thereby avoiding or alleviating the discomfort caused by it.

[0055] It should be noted that the above embodiments can be freely combined as needed to form different new implementation schemes without causing contradictions. All implementation schemes formed by such combinations are within the protection scope of this application. In order to save space in the application text, they will not be described in detail here.

[0056] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the inventive principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this application.

[0057] Similarly, the above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dental orthodontic appliance, characterized in that, include: Shell-shaped orthodontic appliances and extraoral bow devices used to accommodate patients' teeth; The shell-shaped orthodontic appliance has a connecting portion and a retention portion located on the mesial side of the connecting portion on the buccal side of the posterior tooth area on both sides, with the retention portion and the connecting portion being set at a preset distance. The extraoral arch device includes an inner arch body located inside the patient's mouth and having a shape that is basically consistent with the dental arch, and an outer arch body located outside the patient's mouth and connected to the inner arch body. The inner arch body includes a free section connected to the connecting part and a retention section connected to the retention part. The free section and the retention section are connected by a connecting part. The retention portion includes a receiving portion and a limiting portion adjacent to the receiving portion. The limiting portion has an opening structure communicating with a cavity enclosed by the receiving portion. When the inner arch body is assembled with the shell-shaped orthodontic appliance, the retention segment of the inner arch body is pressed into and received within the receiving portion through the opening structure along a first direction. The limiting portion restricts the retention segment from disengaging from the retention portion in a direction opposite to the first direction. The free segment of the inner arch body is inserted into and received within the connecting portion along a second direction. When the outer arch body is pulled backward along the sagittal direction, the extraoral arch device applies a sagittal backward traction force to the shell-shaped orthodontic appliance to move the teeth contained in the shell-shaped orthodontic appliance distally or at least some of the posterior teeth contained therein distally. The first direction and the second direction are different.

2. The dental orthodontic device according to claim 1, characterized in that, The first direction is buccal-lingual or gingival-maxillary, and the second direction is mesio-distal.

3. The dental orthodontic device according to claim 2, characterized in that, The first direction is buccal-lingual, and the opening structure is located on the buccal side of the limiting portion; or, The first direction is the gingival-occlusal direction, and the opening structure is located on the side of the limiting portion near the gingiva or away from the gingiva.

4. The dental orthodontic device according to claim 1, characterized in that, The inner contour dimension of the receiving portion is less than or equal to the outer contour dimension of the retaining segment, so that the retaining segment is fixed within the receiving portion when it is received in the receiving portion. The inner contour dimension of the limiting portion is less than the outer contour dimension of the retaining segment, so as to restrict the retaining segment from detaching from the receiving portion.

5. The dental orthodontic device according to claim 4, characterized in that, The outer contour dimension of the retaining segment is the radial dimension of the outer contour cross-section of the retaining segment in a preset direction, and the inner contour dimension of the receiving portion is the radial dimension of the inner contour cross-section of the receiving portion in the preset direction, wherein the preset direction is different from the first direction.

6. The dental orthodontic device according to claim 1, characterized in that, The retention portion and the connecting portion are at the same height in the gingival-maxillary direction.

7. The dental orthodontic device according to claim 1, characterized in that, The limiting part includes two elastic pieces, and the opening structure is formed between the two elastic pieces. During assembly, the retaining segment is pressed into the receiving part along the first direction from the opening structure and accommodated in the receiving part. The two elastic pieces clamp and limit the retaining segment to prevent the retaining segment from leaving the receiving part.

8. The dental orthodontic device according to claim 1, characterized in that, The retaining portion further includes a guiding portion, which is disposed adjacent to the limiting portion, and the inner contour dimension of the guiding portion gradually decreases from the end away from the limiting portion to the end close to the limiting portion.

9. The dental orthodontic device according to any one of claims 1 to 8, characterized in that, The retaining portion is further provided with a limiting cover plate that restricts the retaining segment from detaching from the retaining portion. The limiting cover plate is provided with a first connector, and a second connector is provided on the side of the retaining portion near its opening end. The limiting cover plate is connected to the retaining portion through the cooperation of the first connector and the second connector. At least a portion of the edge of the limiting cover plate is engaged with a portion of the edge of the opening end of the retaining portion to retain the retaining segment in the receiving portion.

10. The dental orthodontic device according to any one of claims 1-8, characterized in that, A mounting portion is provided on one side of the retention portion near the shell-shaped orthodontic appliance. The shell-shaped orthodontic appliance has a mounting hole at the position corresponding to the retention portion. The mounting portion passes through the mounting hole and is held in place on a portion of the inner surface of the shell-shaped orthodontic appliance around the mounting hole.

11. The dental orthodontic device according to claim 10, characterized in that, The mounting portion includes a main body and a constraint portion; one end of the constraint portion is connected to the main body, and the other end of the constraint portion is a free end. The included angle between the constraint portion and the main body is an acute angle. The constraint portion includes a guide end and a constraint end opposite to the guide end. The outer contour dimension of the guide end is less than or equal to the inner contour dimension of the mounting hole, and the outer contour dimension of the constraint end is greater than the inner contour dimension of the mounting hole. During installation, the guide end is inserted into the mounting hole along the first direction, and the constraint end, under the constraint of the mounting hole, converges inward toward the main body to pass through the mounting hole and is held against the inner surface of a portion of the shell-shaped orthodontic appliance around the periphery of the mounting hole.

12. The dental orthodontic device according to claim 11, characterized in that, The constraint parts are multiple and are spaced apart along the long axis of the main body. The distance between two adjacent constraint parts or the distance between the constraint part and the retention part adjacent to the retention part is greater than or equal to the thickness of the shell-shaped orthodontic appliance around the mounting hole.

Images