Shell-shaped appliance, correction system and dental model

Abstract

The embodiment of the utility model provides a shell-shaped appliance, an orthodontic system and a dental model, and solves the problem of stress concentration of an occlusal surface when a convex part is provided with a reinforcing ridge in a counterpoint manner. The shell-shaped appliance comprises a shell-shaped body used for containing teeth, the shell-shaped body is of an integrally-formed structure, and the shell-shaped body is provided with a first protruding part for reconstructing the occlusal position of the upper jaw and the lower jaw in a protruding mode in the occlusal direction of a rear tooth area. The cheek side face of the first protruding part is provided with a first reinforcing ridge for improving the deformation resistance of the first protruding part, the cheek side face of the first protruding part is concaved inwards to form the first reinforcing ridge, and the tongue side face of the first protruding part is provided with a second reinforcing ridge for improving the deformation resistance of the first protruding part. The tongue side face of the first protruding part is concaved inwards to form the second reinforcing ridge, and at least two adjacent first reinforcing ridges and second reinforcing ridges are arranged in a staggered mode in the buccal tongue direction.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of orthodontics, and particularly to a shell-shaped appliance, an orthodontic system, and a dental model. Background Art

[0002] At present, in the field of orthodontic treatment technology, functional tooth correction is a conventional treatment method for malocclusion symptoms in children and adolescents during the primary dentition period and the mixed dentition period. The single-jaw plate or the Twin-Block correction technology is a conventional treatment method.

[0003] Since the development of invisible tooth correction appliances, due to their comfortable wearing, convenient removal and wearing, and aesthetic advantages, they have been chosen by more and more people. With the continuous improvement of invisible correction technology, functional invisible correction has also emerged in people's vision, such as the advent of invisible single-jaw plate appliances or invisible Twin-Block appliances. Among them, the invisible single-jaw plate appliance can open the bite, level the SPEE curve and treat mild mandibular retrusion cases after wearing by designing a convex structure in the posterior tooth area; the invisible Twin-Block appliance guides the mandible to protrude forward through the mesial and distal inclined planes of two convex occlusal pads when the patient bites. The reverse invisible Twin-Block appliance guides the mandible to retrude through the mesial and distal inclined planes of two convex occlusal pads when the patient bites.

[0004] At present, most of the existing invisible single-jaw plate appliances or invisible Twin-Block appliances are formed by thermoforming, and most of the raised occlusal pads are cavity structures. In this way, during the use by patients, on the one hand, after multiple occlusions, the occlusal pads will deform due to insufficient stiffness or support force. In the prior art, in response to this technical problem, reinforcing ridge structures will be added on both sides of the raised occlusal pads (for example, Chinese Patent No. 202320657561.3). In this case, in order to obtain better support for the reinforcing ridges in the vertical direction, the reinforcing ridges on both sides will be arranged at the adjacent tooth spaces. This setting method will cause new technical problems. This setting method will result in a large difference in width between the positions of the occlusal surfaces of the raised parts at the reinforcing ridges on both sides and the width of the adjacent raised parts. Due to the hollow structure of the raised parts, during the occlusion process, stress concentration problems are more likely to occur at the positions with a larger width on the occlusal surfaces of the raised parts, that is, the raised parts are more likely to collapse at these positions. If the patient continues to use the appliance with the deformed raised parts, it will lead to: (1) insufficient orthodontic force, unable to reach the preset occlusal position, and the subsequent orthodontic steps cannot be carried out normally; (2) the direction of the preset force will be changed, and the undesired force will cause the teeth to move in the undesired direction, finally destroying the entire orthodontic plan. On the other hand, the raised occlusal pads with two cavity structures may be directly bitten and damaged by the patient during use and cannot be used continuously. At this time, it is necessary to re-thermoform and manufacture the invisible orthodontic appliance required for this step of the patient. In this case, it will lead to an increase in orthodontic costs and an extension of the treatment cycle. At the same time, during the period when the patient is waiting for the production of the new invisible orthodontic appliance, due to the interruption of treatment, the teeth may move in an undesired direction without being restricted by the due orthodontic force, and the subsequent invisible orthodontic appliance cannot match the teeth that have already moved, and finally may lead to the restart of orthodontics. Moreover, in view of the generation of undesired forces, during use, the occlusal pads will slide in the buccolingual direction, and the upper and lower jaws cannot accurately reach the preset occlusal position, which will also cause the problem of crossbite.

[0005] Therefore, in the research of functional invisible orthodontic appliances, it is of great significance to develop a dental instrument that not only has the characteristics of comfort and convenience of invisible orthodontic appliances but also does not reduce the orthodontic force of functional orthodontics. Summary of the Utility Model

[0006] The purpose of the embodiments of the present application is to provide a shell-shaped orthodontic appliance, an orthodontic system and a dental model that can effectively solve the above problems, and avoid stress concentration problems on the occlusal surface when reinforcing ridges are set on the raised parts.

[0007] To achieve the above object, an embodiment of the present application provides a shell orthodontic appliance, including a shell-shaped body for accommodating teeth. The shell-shaped body is an integrally formed structure. On the occlusal surface of the posterior tooth area of the shell-shaped body, a first convex portion for reconstructing the occlusal position of the upper and lower jaws protrudes towards the opposing jaw. The buccal side surface of the first convex portion has a first strengthening ridge for improving the anti-deformation ability of the first convex portion. The first strengthening ridge is formed by indenting inward from the buccal side surface of the first convex portion. The lingual side surface of the first convex portion has a second strengthening ridge for improving the anti-deformation ability of the first convex portion. The second strengthening ridge is formed by indenting inward from the lingual side surface of the first convex portion. Among them, at least two adjacent first strengthening ridges and second strengthening ridges are arranged in a staggered manner in the buccolingual direction.

[0008] Preferably, the projections of adjacent first strengthening ridges and second strengthening ridges on the sagittal plane partially overlap.

[0009] Preferably, the width of the overlapping portion of the first strengthening ridge and the second strengthening ridge in the mesiodistal direction is less than or equal to 1 / 2 of the width of the first strengthening ridge in the mesiodistal direction; and / or, the width of the overlapping portion of the second strengthening ridge and the first strengthening ridge in the mesiodistal direction is less than or equal to 1 / 2 of the width of the second strengthening ridge in the mesiodistal direction.

[0010] Preferably, the projections of adjacent first strengthening ridges and second strengthening ridges on the sagittal plane do not overlap.

[0011] Preferably, the shortest distance between the contour edges where the first strengthening ridge is located and the second strengthening ridge is the first distance, and the shortest distance between the contour edges where the second strengthening ridge is located and the first strengthening ridge is the second distance. The difference between any one of the first distances and any one of the second distances is within a predetermined range. Among them, the predetermined range is 0 - 4 mm.

[0012] Preferably, all adjacent first strengthening ridges and second strengthening ridges are arranged in a staggered manner in the buccolingual direction.

[0013] Preferably, the shapes and sizes of the first strengthening ridge and the second strengthening ridge are the same.

[0014] Preferably, there are multiple first strengthening ridges and multiple second strengthening ridges respectively, and the number of the first strengthening ridges is the same as the number of the second strengthening ridges.

[0015] Preferably, multiple first strengthening ridges and multiple second strengthening ridges are arranged alternately in the mesiodistal direction.

[0016] Preferably, the depth value of the inward concavity of the first reinforcing ridge and / or the second reinforcing ridge is between 1 / 4 and 1 / 3 of the average width value of the first protrusion in the buccolingual direction.

[0017] Preferably, the depth value of the inward concavity of the first reinforcing ridge or the second reinforcing ridge is between 1.0 mm and 2.0 mm.

[0018] Preferably, the width of the first reinforcing ridge gradually decreases from the buccal side to the lingual side in the mesiodistal direction; and / or, the width of the second reinforcing ridge gradually decreases from the lingual side to the buccal side in the mesiodistal direction.

[0019] Preferably, the maximum width value of the first reinforcing ridge in the mesiodistal direction is between 2.0 mm and 3.0 mm; the maximum width value of the second reinforcing ridge in the mesiodistal direction is between 2.0 mm and 3.0 mm.

[0020] Preferably, when worn, the lower contour edge of the first protrusion adjacent to the same jaw side supports on the occlusal surface of the teeth of the same jaw; the upper contour edge of the first protrusion adjacent to the opposing jaw side supports on the occlusal surface of the teeth of the opposing jaw; the first reinforcing ridge and the second reinforcing ridge respectively penetrate through the upper contour edge and the lower contour edge.

[0021] Another embodiment of the present application provides a shell-shaped orthodontic appliance, including a first shell-shaped body that at least partially accommodates the maxillary teeth and a second shell-shaped body that at least partially accommodates the mandibular teeth, wherein the first shell-shaped body is the shell-shaped orthodontic appliance as described in any one of the above; the occlusal surface of the second shell-shaped body in the posterior tooth area protrudes towards the opposing jaw direction and is provided with a second protrusion that cooperates with the first protrusion in the first shell-shaped body to cause sagittal movement of the mandible; when the shell-shaped orthodontic appliance is worn, the mesial surface of the first protrusion and the distal surface of the second protrusion interact to cause the mandible to move forward or backward in the sagittal direction to the target occlusal position.

[0022] Preferably, the buccal surface of the second protrusion has a third reinforcing ridge that improves the anti-deformation ability of the second protrusion, the third reinforcing ridge is formed by inward concavity from the buccal side of the second protrusion, the lingual surface of the second protrusion has a fourth reinforcing ridge that improves the anti-deformation ability of the second protrusion, the fourth reinforcing ridge is formed by inward concavity from the lingual side of the second protrusion, wherein at least two adjacent third reinforcing ridges and fourth reinforcing ridges are arranged offset in the buccolingual direction.

[0023] Preferably, the projections of the adjacent third reinforcing ridges and fourth reinforcing ridges on the sagittal plane partially overlap or do not overlap.

[0024] Preferably, the shortest distance between the contour edges where the third reinforcing ridge and the fourth reinforcing ridge are located is the third distance, and the shortest distance between the contour edges where the fourth reinforcing ridge and the third reinforcing ridge are located is the fourth distance. The difference between any one of the third distances and any one of the fourth distances is within a predetermined range, where the predetermined range is 0 - 4 mm.

[0025] Preferably, the mesial surface of the first convex portion is parallel to the distal surface of the second convex portion.

[0026] Preferably, when the mesial surface of the first convex portion and the distal surface of the second convex portion are planes, the mesial surface of the first convex portion or the distal surface of the second convex portion is angled with respect to the buccolingual direction at the corresponding position, and the angle is between 30° - 75° or 105° - 150°.

[0027] Preferably, when the mesial surface of the first convex portion and the distal surface of the second convex portion are curved surfaces, the tangent at the highest point of the mesial surface of the first convex portion or the tangent at the highest point of the distal surface of the second convex portion is angled with respect to the buccolingual direction at the corresponding position, and the angle is between 30° - 75° or 105° - 150°.

[0028] Preferably, the first shell-shaped body has a left first convex portion and a right first convex portion, and the distal surfaces of the left first convex portion and the right first convex portion are axisymmetric about the dental midline, and / or the second shell-shaped body has a left second convex portion and a right second convex portion, and the distal surfaces of the left second convex portion and the right second convex portion are axisymmetric about the dental midline.

[0029] Another embodiment of the present application provides an orthodontic system, including multiple groups of the shell-shaped orthodontic appliances as described in any one of the above. The multiple groups of shell-shaped orthodontic appliances respectively correspond to multiple successive orthodontic steps, wherein the sagittal jaw target positions corresponding to the multiple groups of shell-shaped orthodontic appliances are the same.

[0030] Preferably, the convex heights of the first convex portion and the second convex portion on the shell-shaped orthodontic appliances corresponding to different orthodontic stages in the direction towards the opposing jaw are associated with the orthodontic stages.

[0031] Preferably, the convex heights of the first convex portion and the second convex portion on the multiple groups of shell-shaped orthodontic appliances in the direction towards the opposing jaw gradually decrease as the orthodontic process progresses.

[0032] Another embodiment of the present application provides an orthodontic system, including N shell-shaped orthodontic appliances worn on a single jaw. The N shell-shaped orthodontic appliances are respectively set corresponding to N successive orthodontic steps. Each of the N shell-shaped orthodontic appliances can reposition teeth from the initial layout of the corresponding orthodontic step to the target layout of the corresponding orthodontic step. Among them, at least M of the N shell-shaped orthodontic appliances are the above-mentioned any shell-shaped orthodontic appliances. The M shell-shaped orthodontic appliances are set corresponding to M continuously arranged orthodontic steps, M is greater than or equal to 2 and less than or equal to N.

[0033] Preferably, the positions or sizes of the maximum widths of the first protrusions on at least two of the M shell-shaped orthodontic appliances in the buccolingual direction are inconsistent.

[0034] Another embodiment of the present application provides a dental cast, used as a mold for thermoforming to make a shell-shaped tooth orthodontic appliance, including a dental cast body. On the posterior tooth occlusal surface of the dental cast body, a first protrusion solid model for reconstructing the upper and lower jaw occlusal position protrudes towards the opposing jaw. The buccal side of the first protrusion solid model has a first strengthening ridge solid model, and the first strengthening ridge solid model is formed by recessing and extending inward from the buccal side of the first protrusion solid model. The lingual side of the first protrusion solid model has a second strengthening ridge solid model, and the second strengthening ridge solid model is formed by recessing and extending inward from the lingual side of the first protrusion solid model. Among them, at least two adjacent first strengthening ridge solid models and second strengthening ridge solid models are arranged in a staggered manner in the buccolingual direction.

[0035] Compared with the prior art, a shell-shaped orthodontic appliance, an orthodontic system and a dental cast provided by the present utility model are as follows:

[0036] In each embodiment of the present application, the shell-shaped body has a first protrusion for solving jaw position problems such as mandibular retrusion, deep overbite, and deep overjet. Moreover, in order to avoid the problem of local stress concentration caused by large differences in the widths of various parts on the occlusal surface of the first protrusion due to the provision of a hollow structure with strengthening ridges, the strengthening ridges on both sides of the first protrusion are arranged in a staggered manner, reducing the ratio of the sizes of the widths of various parts of the first protrusion in the buccolingual direction, thereby increasing the ultimate load of the first protrusion in the occlusal direction and making it not easy for the first protrusion to undergo compressive buckling deformation in the occlusal direction. Therefore, the structural improvement of the strengthening ridge on the first protrusion in the present application can improve the anti-deformation ability of the first protrusion in the occlusal direction, ensuring the accuracy and stability of the orthodontic effect.

[0037] In another embodiment of the present application, the shell orthodontic appliance includes a first shell body for the upper jaw and a second shell body for the lower jaw. The first shell body has a first protrusion, and the second shell body has a second protrusion. The mesial surface of the first protrusion interacts with the distal surface of the second protrusion to move the lower jaw forward or backward in the sagittal direction to the target occlusion position. Both the first protrusion and the second protrusion have reinforcing ridges arranged offset on both sides, so that the anti-deformation ability of the first protrusion and the second protrusion in the occlusal direction is improved, and the first shell body and the second shell body are not easily deformed in the occlusal direction during use.

[0038] The present application also provides an orthodontic system. In one embodiment, the orthodontic system includes multiple sets of shell orthodontic appliances including a first shell body and a second shell body. During the entire orthodontic process, the heights of the first protrusion and the second protrusion gradually decrease with the orthodontic process to gradually adjust the relationship between the upper and lower jaws. At the same time, while the N sets of shell orthodontic appliances adjust the relationship between the upper and lower jaws, they also align the teeth to achieve simultaneous orthopedic and orthodontic treatment. In another embodiment, the orthodontic system includes N shell orthodontic appliances, where at least M continuously arranged first shell bodies are included among the N shell orthodontic appliances. The maximum widths of the first protrusions on different first shell bodies in the buccolingual direction can be inconsistent. The advantage of this setting is that according to the different positions of the occlusal forces on the occlusal surfaces of the first protrusions in different stages, the maximum widths are set to avoid these positions, so as to prevent the first protrusions from undergoing compressive buckling deformation in the occlusal direction during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] One or more embodiments are illustrated by way of example in the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0040] Figure 1 is a schematic structural diagram of a shell orthodontic appliance with a protrusion in the prior art;

[0041] Figure 2 is a schematic structural diagram of the alignment of the reinforcing ridges on both sides of the protrusion in the prior art;

[0042] Figure 3 is a schematic structural diagram of the shell orthodontic appliance in the first embodiment of the present application;

[0043] Figure 4 is a schematic structural diagram of the first protrusion in the first embodiment of the present application;

[0044] Figure 5 is a brief schematic diagram of the force on the first protrusion in some embodiments of the present application;

[0045] Figure 6 Schematic diagram of the shape of the occlusal surface of different first convex portions in some embodiments of the present application;

[0046] Figures 7 - 11 Schematic diagram of the structure of the first convex portion in the first embodiment of the present application;

[0047] Figure 12 and Figure 13 Schematic diagram of the structure of the shell-shaped orthodontic appliance in the second embodiment of the present application;

[0048] Figures 14 - 16 Schematic diagram of the structure of the second convex portion in the second embodiment of the present application;

[0049] Figure 17 Schematic diagram of the structure of the orthodontic system in the third embodiment of the present application;

[0050] Figure 18 Schematic diagram of the structure of the orthodontic system in the fourth embodiment of the present application;

[0051] Figure 19 Schematic diagram of the structure of the first convex portions on at least two of the M shell-shaped orthodontic appliances in the fourth embodiment of the present application;

[0052] Figure 20 Schematic diagram of the structure of the dental model in the fifth embodiment of the present application;

[0053] Figure 21 Flowchart of the design method of the digital dental model in the sixth embodiment of the present application;

[0054] Figure 22 Schematic diagram of the electronic device provided by an embodiment of the present application. Detailed implementation manners

[0055] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will elaborate on the various embodiments of the present application in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in the various embodiments of the present application, many technical details are presented for the purpose of enabling the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented. The following division of each embodiment is for convenience of description and should not constitute any limitation on the specific implementation manner of the present application. Each embodiment can be combined and cross-referenced with each other on the premise of not contradicting each other.

[0056] In each embodiment of the present application, the "posterior tooth area" is defined according to the tooth classification on pages 36-38 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including premolars and molars, which are the teeth numbered 4-8 in the FDI notation, and the teeth numbered 1-3 in the FDI notation in the anterior tooth area. The teeth in the anterior tooth area include central incisors, lateral incisors, and canines. In addition, for the teeth in the deciduous tooth stage, the "posterior tooth area" is defined according to the classification of deciduous teeth on pages 40-41 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including three categories: deciduous incisors, deciduous canines, and deciduous molars. Among them, deciduous incisors include deciduous central incisors and deciduous lateral incisors, and deciduous molars include the first deciduous molar and the second deciduous molar.

[0057] The shell-shaped body is provided with several cavities for accommodating multiple teeth, and is divided into a lingual surface, a labial surface, a mesial surface, and a distal surface. Among them, the "lingual surface" is named according to the naming of each surface of the dental crown on pages 35-36 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press. The labial surface and the buccal surface are the surfaces of the dental crowns of the anterior teeth close to the lips, which are called the labial surface, and the surfaces of the dental crowns of the posterior teeth close to the cheeks are called the buccal surface. The lingual surface is the general name for the surfaces of the dental crowns of the anterior and posterior teeth close to the tongue. The mesial surface and the distal surface are the two surfaces of the dental crown adjacent to adjacent teeth, collectively called the adjacent surfaces. The surface closer to the midline of the face is called the mesial surface, and the surface farther from the midline of the face is called the distal surface.

[0058] The shell-shaped orthodontic appliance is an invisible and aesthetic mechanical device for tooth correction produced by computer-aided three-dimensional design. It is usually worn on the teeth in the mouth and is composed of polymer materials, such as TPU, PETG, or a combination of both materials. It can generate a force to change the deformed jawbone, misaligned teeth, and periodontal tissues, which is beneficial to the normal growth and development of the dentofacial region. The shell-shaped orthodontic appliance uses the principle of biomechanics to correct deformed teeth. Through a correction system including a series of shell-shaped orthodontic appliances, a gentle and lasting biological force is applied to slowly move the teeth and restore them to their normal positions, arranging the teeth neatly. Of course, in the present application, in addition to aligning the teeth, the shell-shaped orthodontic appliance can also adjust the jaw relationship of the upper and lower jaws by setting a raised part structure.

[0059] The core technical problem solved in each embodiment of the present application is that for an invisible orthodontic appliance with a raised part, in order to produce and manufacture it simply and quickly and ensure the comfort of the patient during wearing, the raised part and the shell-shaped body are set into an integrally formed structure. However, due to this design, during the wearing process of the shell-shaped body, the inside of the raised part is a cavity structure that does not contact the teeth, which will cause problems such as easy collapse and deformation of the raised part during use. In the prior art, in this case, strengthening ridges are usually set on both sides of the raised part, referring to Figure 1 and Figure 2As shown in the prior art solutions in [reference], generally, when the raised portion has sufficient width in the buccolingual direction to ensure the stability of the raised portion during use, in order to enable the upper and lower edges of the raised portion to obtain more supporting edges on the occlusal surface of the teeth in this jaw and the occlusal surface of the opposing jaw teeth, especially at the adjacent tooth gap, the upper and lower edges of the raised portion will not be suspended and will also be supported on the occlusal surface of the teeth. The two-sided strengthening ridges need to be provided corresponding to the adjacent tooth gap. The adjacent tooth gaps on both sides of the teeth are symmetrical, that is, the two-sided strengthening ridges will be arranged in alignment in the buccolingual direction.

[0060] The inventors of this application have found through research that when the two-sided strengthening ridges are arranged in alignment, the width of the two-sided strengthening ridges in the buccolingual direction is much smaller than the width of the non-strengthening ridge portion on the occlusal surface in the buccolingual direction. This will cause stress concentration to occur more easily in the relatively larger-width areas of the raised portion on the occlusal surface in the buccolingual direction, making the raised portion prone to deformation in these areas during the occlusal process. In each embodiment of this application, the two-sided strengthening ridges of the raised portion are arranged in a staggered manner. Compared with the above prior art content, it can effectively reduce the width of the easily deformed area in the buccolingual direction or the length in the mesiodistal direction in the prior art. Such an arrangement can increase the ultimate load of the raised portion in the occlusal direction, improve the overall anti-deformation ability of the raised portion, and ensure the stability of the shell-shaped orthodontic appliance during use.

[0061] The following will describe each embodiment of this application with reference to the accompanying drawings.

[0062] Embodiment 1

[0063] Refer to Figure 3 and Figure 4 As shown in [references], an embodiment of this application provides a shell-shaped orthodontic appliance, including a shell-shaped body 1 for accommodating teeth. The shell-shaped body 1 is an integrally formed structure. The shell-shaped body 1 has a plurality of tooth receiving cavities 11, and the plurality of tooth receiving cavities 11 enclose all the teeth of the jaw where the shell-shaped orthodontic appliance is worn. On the occlusal surface of the tooth receiving cavity 11 that encloses the teeth in the posterior tooth area, the shell-shaped body 1 protrudes towards the opposing jaw direction to form a first raised portion 12 for reconstructing the occlusal position of the upper and lower jaws. The buccal side of the first raised portion 12 has a first strengthening ridge 121 for improving the anti-deformation ability of the first raised portion 12. The first strengthening ridge 121 is recessed inward from the buccal side of the first raised portion 12. The lingual side of the first raised portion 12 has a second strengthening ridge 122 for improving the anti-deformation ability of the first raised portion 12. The second strengthening ridge 122 is recessed inward from the lingual side of the first raised portion 12. Among them, at least two adjacent first strengthening ridges 121 and second strengthening ridges 122 are arranged in a staggered manner in the buccolingual direction, thereby increasing the ultimate load of the first raised portion 12 in the occlusal direction and improving the overall compressive ability of the first raised portion 12. The specific recessed direction of this inward recess is towards the inside of the cavity structure of the first raised portion 12.

[0064] In some embodiments, the projections of adjacent first reinforcing ridges 121 and second reinforcing ridges 122 on the sagittal plane partially overlap, that is, adjacent first reinforcing ridges 121 and second reinforcing ridges 122 are partially offset in the buccolingual direction. Alternatively, the projections of adjacent first reinforcing ridges 121 and second reinforcing ridges 122 on the sagittal plane do not overlap. That is, adjacent first reinforcing ridges 121 and second reinforcing ridges 122 are completely offset in the buccolingual direction. Compared with the prior art where the reinforcing ridges on both sides of the convex part are arranged in alignment, the complete or partial offset of the first reinforcing ridge 121 and the second reinforcing ridge 122 in the buccolingual direction can reduce the mesiodistal length and / or the buccolingual width of the area where stress concentration is likely to occur. Therefore, the ultimate load of the convex part in the occlusal direction can be increased, thereby improving the anti-deformation ability of the first convex part 12.

[0065] Through the analysis of the prior art, the inventors of the present application offset the reinforcing ridges on both sides in the buccolingual direction (partial offset and complete offset), which can increase the ultimate load of the convex part in the occlusal direction and is less likely to deform. For specific analysis, refer to Figure 5 and Figure 6 as shown in Figure 5 A schematic diagram of the force on the convex part. In the figure, the X-axis is the mesiodistal direction, the Z-axis is the occlusal direction, and F is the force received by the convex part during occlusion. Figure 6 are the shapes of the occlusal surfaces of different convex parts. Among them, the Y-axis is parallel to the buccolingual direction. Figure A is the morphology of the aligned reinforcing ridges on both sides of the convex part in the prior art, Figure B is the occlusal surface morphology of the convex part when the first reinforcing ridge 121 and the second reinforcing ridge 122 on both sides of the convex part in some embodiments of the present application are completely offset, and Figure C is the occlusal surface morphology of the convex part when the first reinforcing ridge 121 and the second reinforcing ridge 122 on both sides of the convex part in some embodiments of the present application are partially offset.

[0066] When the cusp of the opposing tooth acts on the occlusal surface of the convex part, the occlusal surface of the convex part is compressed. Since the convex part is a hollow structure, the edge of the occlusal surface of the convex part can be approximately regarded as a thin plate. The ultimate load for the buckling of a rectangular thin plate with four fixed edges under the action of a central vertical load is:

[0067]

[0068] E is the elastic modulus of the material, v is the Poisson's ratio of the material, a is the width of the rectangle, b is the length of the rectangle, and t is the thickness of the material (which refers to the thickness of the diaphragm corresponding to the convex part in various embodiments of the present application).

[0069] The above formula shows a trend: for a rectangular thin plate, the longer the side length, the smaller its ultimate load. The occlusal surfaces of the raised parts with the reinforcing ridges arranged opposite each other on both sides and the raised parts with the reinforcing ridges arranged offset on both sides can be regarded as several rectangular thin plates joined together.

[0070] Combining the above content, it can be seen that when comparing Figure A and Figure B, HA is greater than HB. That is to say, the ultimate load of the occlusal surface of the raised parts when the first reinforcing ridge 121 and the second reinforcing ridge 122 are arranged offset is greater than the ultimate load of the occlusal surface of the raised parts with the reinforcing ridges arranged opposite each other on both sides. Therefore, when the first reinforcing ridge 121 and the second reinforcing ridge 122 are arranged offset, compared with the setting method in Figure A, the anti-deformation ability of the raised parts can be improved. When comparing Figure A and Figure C, that is to say, the ultimate load of the occlusal surface of the raised parts when the first reinforcing ridge 121 and the second reinforcing ridge 122 are arranged offset is greater than the ultimate load of the occlusal surface of the raised parts with the reinforcing ridges arranged opposite each other on both sides. Therefore, when the first reinforcing ridge 121 and the second reinforcing ridge 122 are arranged offset, compared with the setting method in Figure A, the anti-deformation ability of the raised parts can be improved.

[0071] The occlusal surface of the first raised part 12 in each embodiment of the present application refers to the surface that contacts the occlusal surface of the opposing teeth or the occlusal surface of the shell-shaped appliance worn by the opposing jaw during the wearing of the shell-shaped appliance.

[0072] In some embodiments, when the projections of the adjacent first reinforcing ridge 121 and the second reinforcing ridge 122 on the sagittal plane partially overlap, in order to further increase the ultimate load of the occlusal surface of the first raised part 12, that is, the less the projections of the adjacent first reinforcing ridge 121 and the second reinforcing ridge 122 on the sagittal plane overlap, the greater the ultimate load of the occlusal surface of the first raised part 12. Therefore, on the premise that the overlapping part of the projections of the adjacent first reinforcing ridge 121 and the second reinforcing ridge 122 on the sagittal plane is as small as possible, and the first reinforcing ridge 121 and the second reinforcing ridge 122 have a sufficient number on both sides of the first raised part 12 to ensure the anti-deformation ability of the first raised part 12 in the mesiodistal direction, the width of the overlapping part of the first reinforcing ridge 121 and the second reinforcing ridge 122 in the mesiodistal direction is less than or equal to 1 / 2 of the width of the first reinforcing ridge 121 in the mesiodistal direction. For example, specifically referring to Figure 7 As shown, in the figure, line P is the boundary line parallel to the buccolingual direction passing through the farthest point of the first reinforcing ridge 121 in the mesial direction, line P' is the boundary line parallel to the buccolingual direction passing through the farthest point of the second reinforcing ridge 122 in the mesial direction, and the shaded part D in the figure is the overlapping part of the first reinforcing ridge 121 and the second reinforcing ridge 122. The width h1 of the overlapping part in the mesiodistal direction is less than or equal to 1 / 2 of the width H1 of the first reinforcing ridge 121 in the mesiodistal direction.

[0073] In some other embodiments, when the projections of the adjacent first reinforcing ridge 121 and second reinforcing ridge 122 on the sagittal plane partially overlap, in order to further increase the ultimate load of the occlusal surface of the first protrusion 12, that is, the less the projections of the adjacent first reinforcing ridge 121 and second reinforcing ridge 122 on the sagittal plane overlap, the greater the ultimate load of the occlusal surface of the first protrusion 12. Therefore, on the premise that the overlapping part of the projections of the adjacent first reinforcing ridge 121 and second reinforcing ridge 122 on the sagittal plane is as small as possible, and the first reinforcing ridge 121 and the second reinforcing ridge 122 have a sufficient number on both sides of the first protrusion 12 to ensure the anti-deformation ability of the first protrusion 12 in the mesiodistal direction, the width of the overlapping part of the second reinforcing ridge 122 and the first reinforcing ridge 121 in the mesiodistal direction is less than or equal to 1 / 2 of the width of the second reinforcing ridge 122 in the mesiodistal direction. For example, specifically referring to Figure 8 As shown, in the figure, line P is the boundary line parallel to the buccolingual direction passing through the farthest point of the first reinforcing ridge 121 in the mesial direction, line P' is the boundary line parallel to the buccolingual direction passing through the farthest point of the second reinforcing ridge 122 in the mesial direction, and the shaded part E in the figure is the overlapping part of the first reinforcing ridge 121 and the second reinforcing ridge 122. The width h2 of the overlapping part in the mesiodistal direction is less than or equal to 1 / 2 of the width H2 of the second reinforcing ridge 122 in the mesiodistal direction.

[0074] In some embodiments, referring to Figure 9As shown, the projections of adjacent first strengthening ridges 121 and second strengthening ridges 122 on the sagittal plane do not overlap. That is, the first strengthening ridge 121 and the second strengthening ridge 122 are completely misaligned in the buccolingual direction. In a further preferred embodiment, the shortest distance between the first strengthening ridge 121 and the contour edge where the second strengthening ridge 122 is located is the first distance L1, and the shortest distance between the second strengthening ridge 122 and the contour edge where the first strengthening ridge 121 is located is the second distance L2. The difference between any one of the first distances and any one of the second distances is within a predetermined range, where the predetermined range is 0 - 4 mm. The difference between any one of the first distances and any one of the second distances can be 0 mm or 2 mm or 4 mm. The optimal embodiment is that the difference between any one of the first distances and any one of the second distances is 0 mm. However, since the width of the first protrusion 12 in the buccolingual direction needs to be as small as possible and less than or equal to the buccolingual width of the tooth where it is located in occlusion, generally, the width of the first protrusion 12 in the buccolingual direction is not completely equal everywhere. However, in order to ensure that there is no problem of excessive local width and stress concentration on the occlusal surface of the first protrusion 12, therefore, in this embodiment, the difference between any one of the first distances L1 and any one of the second distances L2 is within a predetermined range, which can ensure that the difference in the buccolingual widths corresponding to any one of the first strengthening ridges 121 and any one of the second strengthening ridges 122 on the occlusal surface of the first protrusion 12 is not too large. Thus, the local ultimate load at the corresponding position of the first strengthening ridge 121 or the second strengthening ridge 122 of the first protrusion 12 will not be too small, avoiding the problem of easy stress concentration and local area deformation in the local area.

[0075] In some embodiments, all adjacent first strengthening ridges 121 and second strengthening ridges 122 are misaligned in the buccolingual direction. This further ensures that when multiple first strengthening ridges 121 and multiple second strengthening ridges 122 are arranged on both sides of the first protrusion 12, the difference in the widths of the occlusal surface of the first protrusion 12 in the buccolingual direction is not too large, avoiding the problem of too small local ultimate load, easy stress concentration, and further local area deformation, which may lead to the failure to achieve the orthodontic effect of the shell-shaped orthodontic appliance.

[0076] In some embodiments, referring to Figure 7 、 Figure 8 and Figure 9 As shown, there are multiple first strengthening ridges 121 and multiple second strengthening ridges 122 respectively. The number of first strengthening ridges 121 is the same as the number of second strengthening ridges 122. The advantage of this setting is that the flexural section modulus of the side surface of the first protrusion 12 where the first strengthening ridge 121 and the second strengthening ridge 122 are located is basically the same. Further preferably, the multiple first strengthening ridges 121 and the multiple second strengthening ridges 122 are arranged alternately in the mesiodistal direction. Similarly, this setting can ensure that the difference in the widths of the occlusal surface of the first protrusion 12 in the buccolingual direction is not too large.

[0077] In some embodiments, the first reinforcing ridge 121 and the second reinforcing ridge 122 have the same shape and size, which can ensure that the flexural section moduli of the side surfaces where the first reinforcing ridge 121 and the second reinforcing ridge 122 are located are basically the same, so that the first protrusion 12 has a stable anti-deformation ability during use.

[0078] Furthermore, the width of the first reinforcing ridge 121 gradually decreases from the buccal side to the lingual side in the mesiodistal direction; and / or, the width of the second reinforcing ridge 122 gradually decreases from the lingual side to the buccal side in the mesiodistal direction. The advantage of such a setting is that when the shell-shaped orthodontic appliance is manufactured by the thermoforming process, the setting with the width gradually decreasing from the lingual side to the buccal side is more likely to be adsorbed and formed, and during the process of the shell-shaped orthodontic appliance being detached from the dental cast, it is also easier to demold. Specifically, referring to Figure 7 、 Figure 8 and Figure 9 as shown, the cross-sectional shapes of the first reinforcing ridge 121 and the second reinforcing ridge 122 on the horizontal plane are polygonal or semi-circular. Different cross-sectional shapes result in different anti-deformation abilities of the first protrusion 12. The trapezoid has the largest flexural section modulus, followed by the semi-circle, and the V-shaped (triangle). However, the first reinforcing ridge 121 and the second reinforcing ridge 122 in the shape of a trapezoid require the side surface of the first protrusion 12 to have a certain length in the mesiodistal direction. In some embodiments, referring to Figure 10 as shown, the maximum width Y1 value of the first reinforcing ridge 121 in the mesiodistal direction is between 2.0 mm and 3.0 mm (including the end point values); the maximum width value Y2 of the second reinforcing ridge 122 in the mesiodistal direction is between 2.0 mm and 3.0 mm (including the end point values). Here, the maximum width values of the first reinforcing ridge 121 and the second reinforcing ridge 122 in the mesiodistal direction refer to the width values near the edge of the first protrusion 12. The inventors of the present application have found through a large number of verifications that such a setting of the width value can ensure that the first reinforcing ridge 121 and the second reinforcing ridge 122 have a large flexural ability, and during the process of manufacturing the shell-shaped orthodontic appliance by the thermoforming process, such a width value can ensure the consistency of the thickness of each part of the first protrusion 12, making the overall thickness of the first protrusion 12 relatively uniform, and during use, the problem that the thinner position is more likely to deform will not occur.

[0079] That is to say, in this case, the preferred embodiment, referring to Figure 3As shown, the first raised portion 12 preferably covers the occlusal surfaces of the teeth in three tooth positions between the 3rd tooth and the 7th tooth, and the same number of first reinforcing ridges 121 and second reinforcing ridges 122 are provided. The first reinforcing ridges 121 and the second reinforcing ridges 122 are alternately arranged in the mesiodistal direction in sequence, and the cross-sectional shapes of the first reinforcing ridges 121 and the second reinforcing ridges 122 in the horizontal plane are trapezoidal.

[0080] In some embodiments, referring to Figure 11 As shown, the depth value X1 of the inward concavity of the first reinforcing ridge 121 is between 1 / 4 and 1 / 3 of the average width value of the first raised portion 12 in the buccolingual direction, and / or the depth value X2 of the inward concavity of the second reinforcing ridge 122 is between 1 / 4 and 1 / 3 of the average width value of the first raised portion 12 in the buccolingual direction. The inward concavity depth value of the first reinforcing ridge 121 and / or the second reinforcing ridge 122 refers to the depth of the concavity from the side surface of the first raised portion 12 towards the hollow interior of the first raised portion 12. The advantage of such a setting in this embodiment is that during the manufacturing process of the shell-shaped orthodontic appliance using the thermoforming process, if the first reinforcing ridge 121 or the second reinforcing ridge 122 is concaved inward too deeply, the thickness of the diaphragm at the concave positions of the first reinforcing ridge 121 and the second reinforcing ridge 122 will be thinner than that at other positions, which makes the overall thickness of the first raised portion 12 uneven. During use, deformation is more likely to occur at the thinner positions. Therefore, after a large amount of research and experimental verification by the inventors of the present application, the depth value X1 of the inward concavity of the first reinforcing ridge 121 is between 1 / 4 and 1 / 3 of the average width value of the first raised portion 12 in the buccolingual direction, and / or the depth value X2 of the inward concavity of the second reinforcing ridge 122 is between 1 / 4 and 1 / 3 of the average width value of the first raised portion 12 in the buccolingual direction. The first reinforcing ridge 121 and / or the second reinforcing ridge 122 have a certain inward concavity depth to ensure the bending resistance of the side surface of the first raised portion 12. Similarly, the inward concavity depth value should not be too large to avoid the thickness consistency of each part of the first raised portion 12 during the generation of the shell-shaped orthodontic appliance using the thermoforming process.

[0081] Furthermore, it should be noted that the depth value X1 of the inward concavity of the first reinforcing ridge 121 here can be the average depth value of the inward concavity of the first reinforcing ridge 121 or the depth value of the inward concavity of the first reinforcing ridge 121 on the occlusal surface of the first raised portion 12. Similarly, the depth value X2 of the inward concavity of the second reinforcing ridge 122 can be the average depth value of the inward concavity of the second reinforcing ridge 122 or the depth value of the inward concavity of the second reinforcing ridge 122 on the occlusal surface of the first raised portion 12.

[0082] In some embodiments, the width value of the first protrusion 12 in the buccolingual direction is between 5 mm and 10 mm, and the depth value of the inward indentation of the first reinforcing ridge 121 or the second reinforcing ridge 122 is between 1.0 mm and 2.0 mm. Similarly, such a setting can ensure that the first reinforcing ridge 121 and / or the second reinforcing ridge 122 have a certain inward indentation depth, so that the side surface of the first protrusion 12 has a certain bending resistance. Moreover, the depth value of the inward indentation of the first reinforcing ridge 121 or the second reinforcing ridge 122 is between 1.0 mm and 2.0 mm, and such a depth value is not too large to avoid the thickness consistency of each part of the first protrusion 12 during the process of generating the shell orthodontic appliance using the thermoforming film process.

[0083] In some embodiments, referring to Figure 3 As shown, when worn, the lower contour edge of the first protrusion 12 adjacent to the same jaw side supports on the occlusal surface of the teeth of the same jaw; the upper contour edge of the first protrusion 12 adjacent to the opposing jaw side supports on the occlusal surface of the teeth of the opposing jaw; the first reinforcing ridge 121 and the second reinforcing ridge 122 respectively penetrate through the upper contour edge and the lower contour edge. The advantage of such a setting is that in each embodiment, the supporting edges of the first reinforcing ridge 121 and the second reinforcing ridge 122 on the first protrusion 12 in the occlusal direction / vertical direction are long enough, so as to improve the supporting force of the first protrusion 12 in the occlusal direction or vertical direction during use, and further avoid problems such as the hollow-structured first protrusion 12 being bitten flat or compressed and deformed upward during use. Further preferably, in order to ensure the consistency of the bending resistance of the side surface of the first protrusion 12, the depth value of the inward indentation of the first reinforcing ridge 121 is equal everywhere along the occlusal direction / vertical direction, and the depth value of the inward indentation of the second reinforcing ridge 122 is equal everywhere along the occlusal direction / vertical direction.

[0084] Embodiment 2

[0085] This embodiment provides a shell orthodontic appliance, referring to Figure 12 as shown and Figure 13As shown, the shell-shaped appliance includes a first shell-shaped body 10 that at least partially houses the maxillary teeth and a second shell-shaped body 20 that at least partially houses the mandibular teeth. The first shell-shaped body 10 is the shell-shaped appliance as described in Embodiment 1 above. On the occlusal surface of the posterior tooth region of the second shell-shaped body 20, a second convex portion 22 that cooperates with the first convex portion 12 in the first shell-shaped body 10 to move the mandible in the sagittal direction is convexly provided in the direction of the opposing jaw. When the shell-shaped appliance is worn, the mesial surface of the first convex portion 12 and the distal surface of the second convex portion 22 interact to move the mandible forward or backward in the sagittal direction to the target occlusal position. Moreover, in some embodiments, the tooth receiving cavities of the first shell-shaped body 10 and the second shell-shaped body 20 have a geometric structure for moving the patient's teeth from a first layout to a second layout, so that the shell-shaped appliance in the present application can complete orthopedic correction synchronously and shorten the correction process.

[0086] In some embodiments, the first convex portion 12 and the first shell-shaped body 10 are of an integral structure, and the second convex portion 22 and the second shell-shaped body 20 are of an integral structure.

[0087] In each embodiment of the present application, the design of the first shell-shaped body 10 of the shell-shaped appliance and the first strengthening ridge 121 and the second strengthening ridge 122 on the first convex portion 12 on the first shell-shaped body 10 is the same as the design of the first strengthening ridge 121 and the second strengthening ridge 122 in the shell-shaped appliance worn on a single jaw in Embodiment 1, and will not be elaborated here. The second shell-shaped body 20 in each embodiment of the present application has multiple tooth receiving cavities, and the tooth receiving cavities wrap all the erupted teeth of the opposing jaw of the jaw where the first shell-shaped body 10 is worn.

[0088] In some embodiments, the buccal side surface of the second convex portion 22 has a third strengthening ridge 221 for improving the anti-deformation ability of the second convex portion 22. The third strengthening ridge 221 is recessed inward from the buccal side surface of the second convex portion 22. The lingual side surface of the second convex portion 22 has a fourth strengthening ridge 222 for improving the anti-deformation ability of the second convex portion 22. The fourth strengthening ridge 222 is recessed inward from the lingual side surface of the second convex portion 22. Among them, at least two adjacent third strengthening ridges 221 and fourth strengthening ridges 222 are arranged in a staggered manner in the buccolingual direction.

[0089] The occlusal surface of the second convex portion 22 in each embodiment of the present application refers to the surface that contacts the occlusal surface of the opposing teeth or the occlusal surface of the shell-shaped appliance worn on the opposing jaw during the wearing process of the shell-shaped appliance.

[0090] In some embodiments, when the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane partially overlap, in order to further increase the ultimate load of the occlusal surface of the second protrusion 22, that is, the less the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane overlap, the greater the ultimate load of the occlusal surface of the second protrusion 22. Therefore, on the premise that the overlapping part of the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane is as small as possible, and the third reinforcing ridge 221 and the fourth reinforcing ridge 222 have a sufficient number on both sides of the second protrusion 22 to ensure the anti-deformation ability of the second protrusion 22 in the mesiodistal direction, the width of the overlapping part of the third reinforcing ridge 221 and the fourth reinforcing ridge 222 in the mesiodistal direction is less than or equal to 1 / 2 of the width of the third reinforcing ridge 221 in the mesiodistal direction. For example, specifically referring to Figure 14 As shown, in the figure, line R is the boundary line parallel to the buccolingual direction passing through the most distal point of the third reinforcing ridge 221 in the mesial direction, line R' is the boundary line parallel to the buccolingual direction passing through the most distal point of the fourth reinforcing ridge 222 in the mesial direction, and the shaded part F in the figure is the overlapping part of the third reinforcing ridge 221 and the fourth reinforcing ridge 222. The width h3 of the overlapping part in the mesiodistal direction is less than or equal to 1 / 2 of the width H3 of the third reinforcing ridge 221 in the mesiodistal direction.

[0091] In some other embodiments, when the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane partially overlap, in order to further increase the ultimate load of the occlusal surface of the second protrusion 22, that is, the less the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane overlap, the greater the ultimate load of the occlusal surface of the second protrusion 22. Therefore, on the premise that the overlapping part of the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane is as small as possible, and the third reinforcing ridge 221 and the fourth reinforcing ridge 222 have a sufficient number on both sides of the second protrusion 22 to ensure the anti-deformation ability of the second protrusion 22 in the mesiodistal direction, the width of the overlapping part of the fourth reinforcing ridge 222 and the third reinforcing ridge 221 in the mesiodistal direction is less than or equal to 1 / 2 of the width of the fourth reinforcing ridge 222 in the mesiodistal direction. For example, specifically referring to Figure 15 As shown, in the figure, line R is the boundary line parallel to the buccolingual direction passing through the most distal point of the third reinforcing ridge 221 in the mesial direction, line R' is the boundary line parallel to the buccolingual direction passing through the most distal point of the fourth reinforcing ridge 222 in the mesial direction, and the shaded part G in the figure is the overlapping part of the third reinforcing ridge 221 and the fourth reinforcing ridge 222. The width h4 of the overlapping part in the mesiodistal direction is less than or equal to 1 / 2 of the width H4 of the fourth reinforcing ridge 222 in the mesiodistal direction.

[0092] In some embodiments, referring to Figure 16As shown, the projections of the adjacent third reinforcing ridge 221 and fourth reinforcing ridge 222 on the sagittal plane do not overlap. That is, the third reinforcing ridge 221 and the fourth reinforcing ridge 222 are completely offset in the buccolingual direction. In a further preferred embodiment, the shortest distance between the third reinforcing ridge 221 and the contour edge where the fourth reinforcing ridge 222 is located is the third distance L3, and the shortest distance between the fourth reinforcing ridge 222 and the contour edge where the third reinforcing ridge 221 is located is the fourth distance L4. The difference between any one third distance and any one fourth distance is within a predetermined range, where the predetermined range is 0 - 4 mm. The difference between any one third distance and any one fourth distance can be 0 mm, 2 mm, or 4 mm. The optimal embodiment is that the difference between any one third distance and any one fourth distance is 0 mm. However, since the width of the second protrusion 22 in the buccolingual direction needs to be as small as possible and less than or equal to the buccolingual width of the tooth where it is located during occlusion, generally, the width of the second protrusion 22 in the buccolingual direction is not completely equal at each place. However, to ensure that there is no problem of excessive local width and stress concentration on the occlusal surface of the second protrusion 22, in this embodiment, the difference between any one third distance L3 and any one fourth distance L4 is within a predetermined range, which can ensure that the difference in the buccolingual width corresponding to any one third reinforcing ridge 221 and any one fourth reinforcing ridge 222 on the occlusal surface of the second protrusion 22 is not too large. Thus, there will be no problem of too small local ultimate load at the corresponding position of the third reinforcing ridge 221 or the fourth reinforcing ridge 222 of the second protrusion 22, avoiding stress concentration and local area deformation in the local area.

[0093] In some embodiments, all adjacent third reinforcing ridges 221 and fourth reinforcing ridges 222 are offset in the buccolingual direction. This further ensures that when multiple third reinforcing ridges 221 and multiple fourth reinforcing ridges 222 are arranged on both sides of the second protrusion 22, the difference in the width of the occlusal surface of the second protrusion 22 in the buccolingual direction is not too large, avoiding the problem of too small local ultimate load, easy stress concentration, and further local area deformation, which may lead to the failure of the orthodontic effect of the shell-shaped orthodontic appliance.

[0094] In some embodiments, the mesial surface of the first protrusion 12 is parallel to the distal surface of the second protrusion 22. When the mesial surface of the first protrusion 12 and the distal surface of the second protrusion 22 are planes, the mesial surface of the first protrusion 12 or the distal surface of the second protrusion 22 is arranged at an angle with the buccolingual direction at the corresponding position, and the angle is between 30° - 75° or 105° - 150°.

[0095] In some other embodiments, when the mesial surface of the first protrusion 12 and the distal surface of the second protrusion 22 are parallel curved surfaces, for example, the mesial surface of the first protrusion 12 is provided with a protruding or recessed reinforcing structure, and the reinforcing structure is concavo-convexly matched with the distal surface of the second protrusion 22. In this embodiment, the tangent line at the highest point of the mesial surface of the first protrusion 12 or the tangent line at the highest point of the distal surface of the second protrusion 22 is arranged at an angle with the buccolingual direction at the corresponding position, and the angle is between 30° - 75° or 105° - 150°.

[0096] In some embodiments, the first shell-shaped body 10 has a left first protrusion 12 and a right first protrusion 12, and the distal surface of the left first protrusion 12 and the distal surface of the right first protrusion 12 are axially symmetric about the dental midline. The second shell-shaped body 20 has a left second protrusion 22 and a right second protrusion 22, and the distal surface of the left second protrusion 22 and the distal surface of the right second protrusion 22 are axially symmetric about the dental midline.

[0097] Preferably, when the first shell-shaped body 10 and the second shell-shaped body 20 are used in combination, the matching states of the left first protrusion 12 and the left second protrusion 22, and the right first protrusion 12 and the right second protrusion 22. The mesial surface of the left first protrusion 12 and the distal surface of the left second protrusion 22 are parallel to each other, and the angle between the buccolingual directions at the corresponding positions of the mesial surface of the left first protrusion 12 and the distal surface of the left second protrusion 22 is between 30° - 75°; the mesial surface of the right first protrusion 12 and the distal surface of the right second protrusion 22 are parallel to each other, and the angle between the buccolingual directions at the corresponding positions of the mesial surface of the right first protrusion 12 and the distal surface of the right second protrusion 22 is between 105° - 150°. The advantage of this is that by designing the inclined surface angles matching the left and right first protrusions 12 and second protrusions 22, the left and right movements of the mandible can be restricted by the first protrusions 12 and the second protrusions 22. The mandibular advancement limiting effect is achieved, and there will be no left-right malocclusion deviation during the orthodontic process, playing a very good positioning role.

[0098] The descriptions of the "left" and "right" directions in this application only represent the positions in the figure, and are not the actual positions where the shell-shaped orthodontic appliance is used.

[0099] In some embodiments, refer to Figure 13As shown, the second raised portion 22 is located at the position corresponding to tooth No. 4. The mesiodistal upward length of the second raised portion 22 is equal to the mesiodistal upward length of its corresponding tooth No. 4. When the shell-shaped appliance in the present application is used to guide the mandible forward, the first raised portion 12 and the second raised portion 22 work together. The second raised portion 22 mainly serves as the force bearing part for the mandible to move forward. The size of the second raised portion 22 only covers the position of tooth No. 4. The smaller size can make the mandible more maneuverable and also avoid the deformation of the second raised portion 22 when it is stressed. Of course, the second raised portion 22 can also be located between the positions corresponding to teeth No. 3 and No. 4. Generally, this is the deepest position of the Spee curve. The advantage of such a setting is that when the shell-shaped appliance in this embodiment is worn, the patient's Spee curve will not be suspended at its deepest, thereby ensuring the occlusal stability of the shell-shaped appliance when worn.

[0100] In some embodiments, the length of the first protrusion 12 in the mesiodistal direction is greater than the length of the second protrusion 22 in the mesiodistal direction. In order to make the supporting force of the first protrusion 12 and the second protrusion 22 in the occlusal direction more uniform and stable during use of the shell-shaped orthodontic appliance, the maximum width of the auxiliary support portion on the first protrusion 12 in the mesiodistal direction is greater than the maximum width of the auxiliary support portion on the second protrusion 22 in the mesiodistal direction.

[0101] In some embodiments, the occlusal surfaces of the first protrusion 12 and the second protrusion 22 have a bite mark structure that matches the occlusal surface of the opposing teeth at the target occlusal position.

[0102] Embodiment 3

[0103] The present embodiment provides a correction system, including multiple groups of shell-shaped appliances as described in the second embodiment, the multiple groups of shell-shaped appliances correspond to multiple successive correction steps, wherein the sagittal jaw target positions corresponding to the multiple groups of shell-shaped appliances are consistent. The reconstruction of the jaw position refers to the change of the relative position relationship of the upper and lower jaws and maintaining them at the target position. Therefore, the sagittal reconstruction of the jaw position requires the use of multiple groups of shell-shaped appliances to keep the upper and lower jaws in the same sagittal position, so that muscle memory can be rebuilt, allowing the patient to complete the sagittal reconstruction of the jaw position by wearing multiple groups of shell-shaped appliances. In addition, the multiple groups of shell-shaped appliances can also synchronously complete the gradual alignment of the teeth, so that the orthopedic treatment is completed synchronously and the correction time is shortened.

[0104] In some embodiments, the protrusion height of the first protrusion toward the opposite jaw and the protrusion height of the second protrusion toward the opposite jaw provided on the shell-shaped appliance corresponding to different correction stages are set in association with the correction stage.

[0105] Continue to refer Figure 17As shown, the protruding heights of the first protruding portions 12 and the second protruding portions 22 provided on multiple sets of shell-shaped appliances in the direction towards the opposing jaw gradually decrease as the orthodontic treatment progresses. The advantage of doing so is to gradually level the dental arch to the target state and assist the posterior teeth to gradually rise. Specifically, referring to Figure 17 shows at least two sets of shell-shaped appliances among multiple sets of shell-shaped appliances. The shell-shaped appliance 200 is the shell-shaped appliance to be used in the subsequent orthodontic treatment steps of the shell-shaped appliance 100. Among them, the height of the first protruding portion 12 and the height of the second protruding portion 22 in the shell-shaped appliance 200 are less than the height of the first protruding portion 12 and the height of the second protruding portion 22 in the shell-shaped appliance 100.

[0106] Embodiment 4

[0107] Another embodiment of the present application provides an orthodontic system. Referring to Figure 18 As shown, it includes N shell-shaped appliances worn on a single jaw. The N shell-shaped appliances are respectively set corresponding to N successive orthodontic treatment steps. Each of the N shell-shaped appliances can reposition the teeth from the initial layout of the corresponding orthodontic treatment step to the target layout of the corresponding orthodontic treatment step. Among them, at least M of the N shell-shaped appliances are shell-shaped appliances as in Embodiment 1. The M shell-shaped appliances are set corresponding to M continuously arranged orthodontic treatment steps. M is greater than or equal to 2 and less than or equal to N. The M shell-shaped appliances can be in the initial stage or the intermediate stage or the final stage of the orthodontic system, and specifically can be determined according to the specific settings in the orthodontic treatment plan.

[0108] In some embodiments, the positions or sizes of the maximum widths of the first protruding portions on at least two of the M shell-shaped appliances in the buccolingual direction are inconsistent. For example, referring to Figure 19As shown, in some embodiments, at least two of the M shell-shaped appliances are the shell-shaped appliance 300 and the shell-shaped appliance 400. On the shell-shaped appliance 300, the maximum width of the first convex portion 12 in the buccolingual direction is the width Q1 near the anterior tooth region. On the shell-shaped appliance 400, the maximum width of the first convex portion 12 in the buccolingual direction is the width Q2 near the posterior tooth region. The reason for such a setting is that in order to improve the resistance of the corresponding M first convex portions in the M orthodontic steps during the orthodontic process against being bitten and deformed, and to avoid the interruption of orthodontics, it is necessary to adjust the position or size of the maximum width of the first convex portion in the buccolingual direction in different steps according to different situations. The purpose is to avoid the situation where the maximum load limit of the first convex portion is at the minimum value in the region with the maximum biting force, which may cause the first convex portion to be easily bitten and deformed. Therefore, during the design process, the position of the maximum width of the first convex portion in the buccolingual direction is set to avoid the region with the maximum biting force in the posterior tooth region of the patient. During the orthodontic process, the region with the maximum biting force in the posterior tooth region of the patient may change. That is to say, the position or size of the maximum width of the M first convex portions in the buccolingual direction also needs to change. Specifically, the position or size of the maximum width of the first convex portion in the buccolingual direction is adjusted by adjusting the positions or sizes of the first strengthening ridge and the second strengthening ridge on different first convex portions.

[0109] Embodiment Five

[0110] Reference Figure 20 As shown, this embodiment provides a dental cast, which is used as a mold for thermoforming a shell-shaped tooth orthodontic appliance. It includes a dental cast body 1000. On the posterior tooth occlusal surface of the dental cast body 1000, a first convex portion solid model 1012 for reconstructing the occlusal position of the upper and lower jaws protrudes towards the opposing jaw. The buccal side of the first convex portion solid model 1012 has a first strengthening ridge solid model 1111, which is formed by inwardly recessing and extending from the buccal side of the first convex portion solid model 1012. The lingual side of the first convex portion solid model 1012 has a second strengthening ridge solid model 1112, which is formed by inwardly recessing and extending from the lingual side of the first convex portion solid model 1012. Among them, at least two adjacent first strengthening ridge solid models 1111 and second strengthening ridge solid models 1112 are arranged in a staggered manner in the buccolingual direction.

[0111] Specifically, the dental arch body includes a tooth part 1001 and a support part 1002. The tooth layout on the tooth part 1001 has the same arrangement as the tooth layout at the target position of the patient. The support part 1002 is located at the bottom of the tooth part 1001 and is used to provide support for the tooth part 1001 during the thermoplastic membrane process. On the occlusal surface of the posterior tooth area of the tooth part 1001, a first convex part solid model 1012 is provided between the 3rd tooth and the 7th tooth. In some embodiments, the first convex part solid model 1012 is located on the left side and / or the right side of the tooth part 1001. The setting method of the first convex part solid model 1012 where the buccal side recesses inward to form a first strengthening ridge solid model 1111 and the lingual side recesses inward to form a second strengthening ridge solid model 1112 is the same as the setting method of the first strengthening ridge and the second strengthening ridge on the first convex part in the embodiment, or the same as the setting method of the third strengthening ridge and the fourth strengthening ridge in the second embodiment, which will not be elaborated here.

[0112] Embodiment Six

[0113] This embodiment provides a design method for a digital dental arch model, as Figure 21 shown.

[0114] Step 101, obtain a basic digital dental arch model and the height of the convex part.

[0115] Generally, a three-dimensional model of the current teeth layout of the patient is obtained according to oral scan data or according to a plaster model, and then the three-dimensional model of the current teeth is adjusted according to the orthodontic treatment plan to obtain a basic digital dental arch model. That is to say, the basic digital dental arch model corresponds to the teeth layout under the stage target.

[0116] The height of the convex part can be obtained according to the relative position relationship of the upper and lower jaw targets set by the doctor clinically. Of course, it can also be calculated according to the relative position relationship of the three-dimensional digital models of the upper and lower jaws.

[0117] Step 102, according to the basic digital dental arch model and the height of the convex part, generate a first convex part digital model for reconstructing the occlusal position of the upper and lower jaws in a specified area on the occlusal surface of the posterior tooth area of the basic digital dental arch model; wherein, the buccal side of the first convex part digital model has a first strengthening ridge that recesses inward, the lingual side of the first convex part has a second strengthening ridge that recesses inward, and at least two adjacent first strengthening ridges and second strengthening ridges are arranged offset in the buccolingual direction.

[0118] In some embodiments, according to the basic digital dental arch model and the height of the raised portion, a first digital model of the raised portion for reconstructing the occlusal positions of the upper and lower jaws is generated within a specified area on the occlusal surface of the posterior tooth region of the basic digital dental arch model, including: obtaining the occlusal surface shape and dimensions of the tooth models within the specified area on the occlusal surface of the posterior tooth region of the basic digital dental arch model; and generating the first digital model of the raised portion within the specified area on the occlusal surface of the posterior tooth region of the basic digital dental arch model according to the height of the raised portion and the occlusal surface shape and dimensions of the tooth models.

[0119] In some embodiments, a preset initial raised portion model corresponding to the first digital model of the raised portion is obtained. The preset initial raised portion model is obtained by the operator from a model library and has a frustum of a pyramid structure. The area corresponding to the teeth on the occlusal surface of the posterior tooth region of the basic digital dental arch model is selected as the specified area for generating the first raised portion model. Then, the shape and dimensions of the initial raised portion model are adjusted according to the occlusal surface shape and dimensions of the tooth models within the specified area to obtain the first digital model of the raised portion, including adjusting the height of the initial raised portion model in the gingival-jaw direction according to the height of the raised portion, and then adjusting the surface shape of the initial raised portion model located within the specified area according to the occlusal surface shape of the tooth models within the specified area, so that the surface shape of the initial raised portion model located within the specified area matches the concavity and convexity of the occlusal surface of the teeth within the specified area. In some embodiments, the surface of the initial raised portion model opposite to the surface located within the specified area (i.e., the surface adjacent to the opposing jaw) can be set as a surface parallel to the horizontal plane or the occlusal plane, or a surface that matches the concavity and convexity of the occlusal surface of the opposing teeth.

[0120] In some embodiments, adjusting the dimensions of the initial raised portion model according to the occlusal surface dimensions of the tooth models within the specified area includes adjusting the width of the initial raised portion model in the buccolingual direction, so that the width of the surface of the initial raised portion model located within the specified area in the buccolingual direction is less than or equal to the width of the corresponding tooth occlusal surface within the specified area in the buccolingual direction.

[0121] In some embodiments, adjusting the shape and dimensions of the initial raised portion model according to the occlusal surface shape and dimensions of the tooth models to obtain the first digital model of the raised portion further includes: respectively obtaining the dimensions and shapes of the first reinforcing ridge and the second reinforcing ridge, and generating the first digital model of the raised portion with the first reinforcing ridge and the second reinforcing ridge on the side surface of the adjusted initial raised portion model according to the dimensions and shapes of the first reinforcing ridge and the second reinforcing ridge. The adjacent first reinforcing ridge and second reinforcing ridge are arranged in a staggered manner.

[0122] In some other embodiments, according to the basic digital dental arch model and the height of the raised portion, a first digital model of the raised portion for reconstructing the occlusal position of the upper and lower jaws is generated within a specified area of the occlusal surface of the posterior tooth region of the basic digital dental arch model, including: obtaining the occlusal surface of the tooth model within the specified area of the occlusal surface of the posterior tooth region of the basic digital dental arch model as the lower surface of the initial raised portion model, obtaining the occlusal surface of the opposing tooth model within the specified area as the upper surface of the initial raised portion model, or copying the lower surface and using the surface obtained by copying the lower surface as the upper surface of the initial raised portion model, and then generating the side surface of the initial raised portion model based on the upper surface and the lower surface, and finally generating the initial raised portion model from the upper surface, the lower surface, and the side surface. Further, obtaining the dimensions and shapes of the first reinforcing ridge and the second reinforcing ridge, and generating the first digital model of the raised portion with the first reinforcing ridge and the second reinforcing ridge on the side surface of the initial raised portion model according to the dimensions and shapes of the first reinforcing ridge and the second reinforcing ridge.

[0123] Specifically, obtaining the occlusal surface of the tooth model within the specified area of the occlusal surface of the posterior tooth region of the basic digital dental arch model as the lower surface of the initial raised portion model includes: obtaining the two farthest points in the buccal direction on the occlusal surface of the tooth model within the specified area of the occlusal surface of the posterior tooth region, and using these two points as the two control points for each tooth. Finally, uniform interpolation is performed among all the obtained control points to obtain the boundary of the lower surface mesh of the initial raised portion model; among them, parameters such as the spacing of the uniform interpolation can be adaptively adjusted according to the actual situation. After obtaining the boundary of the lower surface mesh, the interior within the boundary box selection can be filled with a mesh to obtain the lower surface mesh of the initial raised portion model.

[0124] Similarly, the upper surface of the initial raised portion model can be obtained by copying the upper surface, or by obtaining the occlusal surface of the opposing tooth model within the specified area as the upper surface of the initial raised portion model. Specifically, it includes: obtaining the two farthest points in the buccal direction on the occlusal surface of the opposing tooth model within the specified area of the occlusal surface of the posterior tooth region, and using these two points as the two control points for each tooth. Finally, uniform interpolation is performed among all the obtained control points to obtain the boundary of the upper surface mesh of the initial raised portion model; among them, parameters such as the spacing of the uniform interpolation can be adaptively adjusted according to the actual situation. After obtaining the boundary of the upper surface mesh, the interior within the boundary box selection can be filled with a mesh to obtain the upper surface mesh of the initial raised portion model.

[0125] In some embodiments, generating the side surface of the initial raised portion model based on the upper surface and the lower surface further includes scaling the upper surface and / or the lower surface to generate the side surface of the initial raised portion model, where the scaling ratio is between 0.5 and 0.9. Specifically, the scaling method includes that there are two control points in the buccolingual direction in the area corresponding to each tooth on the edge of the lower surface of the initial raised portion model, and the scaling of the lower surface is completed by adjusting the positions of the control points on the occlusal surface of the corresponding tooth. Similarly, there are two control points in the buccolingual direction in the area corresponding to each tooth on the edge of the upper surface of the initial raised portion model, and the scaling of the upper surface is completed by adjusting the positions of the control points on the occlusal surface of the corresponding tooth in the opposing jaw. The width of the scaled initial raised portion model in the buccolingual direction is smaller than the width of the occlusal surface of the tooth at the corresponding position in the specified area in the buccolingual direction, so that the first raised portion digital model can support on the occlusal surface of the tooth.

[0126] Step 103: Merge the basic digital dental arch model and the first raised portion digital model to generate a digital dental arch model with raised portions.

[0127] The basic digital dental arch model and the first raised portion digital model are merged through Boolean operation to generate a digital dental arch model with raised portions. The acquisition process is simple and direct, and a composite model of the basic digital dental arch model and the first raised portion digital model can be obtained quickly.

[0128] In some embodiments, the first raised portion digital model can be directly generated from the basic digital dental arch model and is also included in the protection scope of this step.

[0129] Embodiment Seven

[0130] This embodiment provides a method for generating a shell-shaped orthodontic appliance. In some embodiments, an additive manufacturing method is used to manufacture a physical model of the digital dental arch model obtained by the design method of the digital dental arch model described in Embodiment Six. The additive manufacturing can also be called 3D printing, which integrates computer-aided design, material processing and forming technologies, and is based on digital model files. Through software and a numerical control system, special metal materials, non-metal materials, and medical biological materials are stacked layer by layer in ways such as extrusion, sintering, melting, stereolithography, and jetting to manufacture physical objects. Then, a shell-shaped orthodontic appliance is manufactured according to the physical model by means of thermoforming.

[0131] In some other embodiments, a digital model of a shell orthodontic appliance is generated from the digital dental arch model obtained by the design method of the digital dental arch model according to Embodiment VI. The digital model of the shell orthodontic appliance is a negative mold of the digital dental arch model and has a certain thickness. Generally, the thickness is between 0.5 mm and 1.5 mm. Then, the shell orthodontic appliance is manufactured by additive manufacturing according to the digital model of the shell orthodontic appliance.

[0132] It is worth mentioning that each module involved in this embodiment is a logical module. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, units that are not closely related to solving the technical problems proposed by the present invention are not introduced in this embodiment, but this does not mean that there are no other units in this embodiment.

[0133] One embodiment of the present invention relates to an electronic device, as Figure 22 shown, including at least one processor 1101; and,

[0134] a memory 1102 communicatively connected to the at least one processor 1101; wherein,

[0135] the memory 1102 stores instructions executable by the at least one processor 1101, and the instructions are executed by the at least one processor 1101 so that the at least one processor 1101 can execute the design method of the digital dental arch model or the generation method of the shell orthodontic appliance.

[0136] Among them, the memory and the processor are connected by a bus. The bus can include any number of interconnected buses and bridges. The bus connects various circuits of one or more processors and memories together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art. Therefore, they will not be further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be an element or multiple elements, such as multiple receivers and transmitters, and provides a unit for communicating with various other devices on the transmission medium. The data processed by the processor is transmitted over the wireless medium through the antenna. Further, the antenna also receives data and transmits the data to the processor.

[0137] The processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory can be used to store data used by the processor when performing operations.

[0138] One embodiment of the present invention relates to a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the above method embodiments are implemented.

[0139] That is, those skilled in the art can understand that all or part of the steps in implementing the above method embodiments can be completed by instructing relevant hardware through a program. This program is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, etc., all kinds of media that can store program codes.

[0140] It should be noted that, without conflict, the above embodiments can be freely combined as needed to form different new implementation schemes. The implementation schemes formed after such combination are all within the protection scope of the present utility model. To save the space of the application text, they will not be elaborated here.

[0141] The above are only the preferred implementation modes of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as within the protection scope of the present utility model.

[0142] Similarly, the above are only the specific implementation modes of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A shell-shaped appliance, comprising a shell-shaped body for accommodating teeth, the shell-shaped body being an integrally formed structure, characterized in that: The shell-shaped body is convex in the occlusal surface direction of the posterior tooth area towards the opposing jaw, provided with a first convex portion for reconstructing the occlusal position of the upper and lower jaws. The buccal side of the first convex portion has a first strengthening ridge for enhancing the anti-deformation ability of the first convex portion. The first strengthening ridge is formed by concave inward from the buccal side of the first convex portion. The lingual side of the first convex portion has a second strengthening ridge for enhancing the anti-deformation ability of the first convex portion. The second strengthening ridge is formed by concave inward from the lingual side of the first convex portion. Among them, at least two adjacent first strengthening ridges and second strengthening ridges are arranged in a staggered manner in the buccolingual direction.

2. The shell-shaped orthodontic appliance according to claim 1, characterized in that, The projected portions of adjacent first strengthening ridges and second strengthening ridges overlap in the sagittal plane.

3. The shell-shaped orthodontic appliance according to claim 2, wherein, The width of the overlapping portion of the first strengthening ridge and the second strengthening ridge in the mesiodistal direction is less than or equal to 1 / 2 of the width of the first strengthening ridge in the mesiodistal direction; and / or, the width of the overlapping portion of the second strengthening ridge and the first strengthening ridge in the mesiodistal direction is less than or equal to 1 / 2 of the width of the second strengthening ridge in the mesiodistal direction.

4. The shell-shaped orthodontic appliance according to claim 1, characterized in that, The projected portions of adjacent first strengthening ridges and second strengthening ridges do not overlap in the sagittal plane.

5. The shell-shaped orthodontic appliance according to claim 4, characterized in that, The shortest distance between the contour edges where the first strengthening ridge is located and the second strengthening ridge is the first distance, and the shortest distance between the contour edges where the second strengthening ridge is located and the first strengthening ridge is the second distance. The difference between any one of the first distances and any one of the second distances is within a predetermined range, where the predetermined range is 0 - 4 mm.

6. The shell-shaped orthodontic appliance according to claim 1, wherein, All adjacent first strengthening ridges and second strengthening ridges are arranged in a staggered manner in the buccolingual direction.

7. The shell-shaped orthodontic appliance according to any one of claims 1-6, characterized in that The shapes and sizes of the first strengthening ridge and the second strengthening ridge are the same.

8. The shell-shaped orthodontic appliance according to any one of claims 1-6, characterized in that, There are multiple first strengthening ridges and multiple second strengthening ridges respectively, and the number of the first strengthening ridges is the same as the number of the second strengthening ridges.

9. The shell-shaped orthodontic appliance according to claim 8, characterized in that, Multiple first strengthening ridges and multiple second strengthening ridges are arranged alternately in the mesiodistal direction in sequence.

10. The shell-shaped orthodontic appliance according to any one of claims 1-6, characterized in that, The depth value of the inward concavity of the first strengthening ridge and / or the second strengthening ridge is between 1 / 4 and 1 / 3 of the average width value of the first convex portion in the buccolingual direction.

11. The shell-shaped orthodontic appliance according to claim 10, characterized in that, The depth value of the inward concavity of the first strengthening ridge or the second strengthening ridge is between 1.0 mm and 2.0 mm.

12. The shell-shaped orthodontic appliance according to claim 1, wherein, The width of the first strengthening ridge gradually decreases from the buccal side to the lingual side in the mesiodistal direction; and / or, the width of the second strengthening ridge gradually decreases from the lingual side to the buccal side in the mesiodistal direction.

13. The shell-shaped orthodontic appliance according to claim 12, characterized in that, The maximum width value of the first strengthening ridge in the mesiodistal direction is between 2.0 mm and 3.0 mm; the maximum width value of the second strengthening ridge in the mesiodistal direction is between 2.0 mm and 3.0 mm.

14. The shell-shaped orthodontic appliance according to claim 1, characterized in that, When worn, the lower contour edge of the first convex portion adjacent to the same jaw side supports on the occlusal surface of the teeth of the same jaw; the upper contour edge of the first convex portion adjacent to the opposing jaw side supports on the occlusal surface of the teeth of the opposing jaw; the first strengthening ridge and the second strengthening ridge respectively penetrate through the upper contour edge and the lower contour edge.

15. A shell-shaped orthodontic appliance, characterized in that: A first shell-shaped body that at least partially houses the maxillary teeth and a second shell-shaped body that at least partially houses the mandibular teeth, the first shell-shaped body being the shell-shaped orthodontic appliance according to any one of claims 1-14; a second convex portion that protrudes in the occlusal surface direction of the posterior tooth region toward the opposing jaw and cooperates with the first convex portion in the first shell-shaped body to move the mandible sagittally; when the shell-shaped orthodontic appliance is worn, the mesial surface of the first convex portion and the distal surface of the second convex portion interact to move the mandible forward or backward sagittally to a target occlusal position.

16. The shell-shaped orthodontic appliance according to claim 15, characterized in that, The buccal surface of the second convex portion has a third reinforcing ridge that improves the anti-deformation ability of the second convex portion, the third reinforcing ridge being recessed inward from the buccal surface of the second convex portion, the lingual surface of the second convex portion has a fourth reinforcing ridge that improves the anti-deformation ability of the second convex portion, the fourth reinforcing ridge being recessed inward from the lingual surface of the second convex portion, wherein at least two adjacent third reinforcing ridges and fourth reinforcing ridges are arranged offset in the buccolingual direction.

17. The shell-shaped orthodontic appliance according to claim 16, wherein The projections of adjacent third reinforcing ridges and fourth reinforcing ridges on the sagittal plane partially overlap or do not overlap.

18. The shell-shaped orthodontic appliance according to claim 17, characterized in that, The shortest distance between the contour edges where the third reinforcing ridge is located and the fourth reinforcing ridge is the third distance, the shortest distance between the contour edges where the fourth reinforcing ridge is located and the third reinforcing ridge is the fourth distance, and the difference between any one of the third distances and any one of the fourth distances is within a predetermined range, wherein the predetermined range is 0-4 mm.

19. The shell-shaped orthodontic appliance according to claim 15, characterized in that, The mesial surface of the first convex portion and the distal surface of the second convex portion are parallel to each other.

20. The shell-shaped orthodontic appliance according to claim 19, wherein, When the mesial surface of the first convex portion and the distal surface of the second convex portion are flat surfaces, the mesial surface of the first convex portion or the distal surface of the second convex portion is arranged at an angle with the buccolingual direction at the corresponding position, and the angle is between 30°-75° or 105°-150°.

21. The shell-shaped orthodontic appliance according to claim 19, wherein, When the mesial surface of the first convex portion and the distal surface of the second convex portion are curved surfaces, the tangent line at the highest point of the mesial surface of the first convex portion or the tangent line at the highest point of the distal surface of the second convex portion is arranged at an angle with the buccolingual direction at the corresponding position, and the angle is between 30°-75° or 105°-150°.

22. The shell-shaped orthodontic appliance according to claim 15, wherein, The first shell-shaped body has a left first convex portion and a right first convex portion, the distal surfaces of the left first convex portion and the right first convex portion are axisymmetric about the dental midline, and / or the second shell-shaped body has a left second convex portion and a right second convex portion, the distal surfaces of the left second convex portion and the right second convex portion are axisymmetric about the dental midline.

23. A correction system, characterized in that, It includes multiple sets of shell-shaped orthodontic appliances according to any one of claims 15-22, and multiple sets of the shell-shaped orthodontic appliances respectively correspond to multiple successive orthodontic steps, wherein the sagittal jaw target positions corresponding to multiple sets of the shell-shaped orthodontic appliances are the same.

24. The orthodontic system according to claim 23, characterized in that, The convex heights of the first convex portion and the second convex portion protruding toward the opposing jaw on the shell-shaped orthodontic appliances corresponding to different orthodontic stages are associated with the orthodontic stages.

25. The orthodontic system according to claim 24, wherein, The protruding heights of the first protruding portions and the second protruding portions provided on multiple groups of the shell-shaped appliances in the direction towards the opposing jaw gradually decrease as the orthodontic treatment progresses.

26. An orthodontic system, comprising N shell-shaped orthodontic appliances worn on a single jaw, characterized in that, The N shell-shaped appliances are respectively provided corresponding to N successive orthodontic treatment steps, and each of the N shell-shaped appliances can reposition teeth from the initial layout of the corresponding treatment step to the target layout of the corresponding treatment step. Among them, at least M of the N shell-shaped appliances are the shell-shaped appliances described in any one of claims 1-14. The M shell-shaped appliances are provided corresponding to M continuously arranged orthodontic treatment steps, M is greater than or equal to 2 and less than or equal to N.

27. The orthodontic system according to claim 26, wherein The positions or sizes of the maximum widths in the buccolingual direction of the first protruding portions on at least two of the M shell-shaped appliances are inconsistent.

28. A dental model, used as a mold for making a shell-shaped tooth orthodontic appliance by thermoforming, includes a dental model body, characterized in that, On the posterior tooth occlusal surface of the dental arch model body, a first protruding portion solid model for reconstructing the upper and lower jaw occlusal position protrudes in the direction towards the opposing jaw. The buccal side surface of the first protruding portion solid model has a first strengthening ridge solid model, which is formed by inward concave extension from the buccal side surface of the first protruding portion solid model. The lingual side surface of the first protruding portion solid model has a second strengthening ridge solid model, which is formed by inward concave extension from the lingual side surface of the first protruding portion solid model. Among them, at least two adjacent first strengthening ridge solid models and second strengthening ridge solid models are arranged in a staggered manner in the buccolingual direction.

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