Shell-shaped dental appliance and orthodontic treatment system

Abstract

FIELD OF THE DISCLOSURE This application relates to shell-like dental appliances and orthodontic treatment systems. [Solution] A shell-shaped dental appliance is attached to the maxillary dentition and includes a shell-shaped body, the shell-shaped body is provided with a plurality of tooth-receiving cavities, and an adjustment part is provided in the jaw region of the shell-shaped body for adjusting the relative positional relationship between the maxilla and the mandible, the adjustment part includes a first guide part and a support part for supporting the first guide part, the first guide part is connected to the tongue side free end of at least two of the tooth-receiving cavities in the anterior tooth region across the maxilla corresponding to the anterior tooth region, the first guide part is provided at an incline with respect to the mandibular lower edge plane, thereby sliding some of the anterior teeth of the mandible along the first guide part and driving the mandible to move forward to a target orthodontic position, the support part is connected to the first guide part and is formed to extend from the gingival end of the plurality of tooth-receiving cavities in the molar region to the jaw side, and a part of the support part is supported by the maxilla when attached. The present application further includes an orthodontic treatment system having at least one of the above-mentioned shell-shaped dental appliances.

Description

[Technical field]

[0001] This application has been filed based on and claims priority to Chinese patent application having application number "202210576041.X" and filing date May 24, 2022, and Chinese patent application having application number "202221363764.3" and filing date May 24, 2022, the entire contents of which are incorporated herein by reference.

[0002] FIELD OF THE DISCLOSURE Embodiments of the present application relate to the field of orthodontic treatment, and more particularly, to shell-like dental appliances and orthodontic treatment systems. [Background technology]

[0003] Protrusive malocclusion is a common dentofacial problem in Asians, and most cases of maxillary and maxillary prognathism are manifested as mandibular setback, especially mandibular setback due to mouth breathing problems in children. For cases of mandibular setback, it is necessary to adjust the mandibular position and guide the mandible to adjust forward along the sagittal direction. Currently, commonly used orthodontic treatment devices include an occlusal inclined plate for the maxilla and the Twin-Block (abbreviated as TB) orthodontic appliance. For the TB orthodontic appliance, blocks are placed in the first molar area behind the maxillary bilateral premolars and in the mandibular premolar area. If the TB orthodontic appliance is used during or just before the lateral teeth of adolescent patients in the mixed dentition stage are replaced, the retention problem caused by frequent tooth replacement during the mixed dentition stage cannot be solved, and good retention cannot be improved.

[0004] In the prior art, a removable orthodontic appliance is also used to treat mandibular retrusion, which is common in adolescents in clinical practice. The removable orthodontic appliance is usually made up of brackets, clasps, etc., and is bulky, feels foreign in the patient's mouth, is unattractive, and is less comfortable.

[0005] For this reason, the present application provides a solution to the above problem. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem solved by the present application is to overcome the deficiencies in the prior art and provide a shell-shaped dental appliance and orthodontic treatment system. [Means for solving the problem]

[0007] In order to achieve the above object, the present application uses the following technical means.

[0008] The shell-shaped dental appliance is attached to the maxillary dentition and includes a shell-shaped body, the shell-shaped body being provided with a plurality of tooth-receiving cavities, and an adjustment portion for adjusting the relative positional relationship between the maxilla and the mandible is provided in the jaw region of the shell-shaped body, the adjustment portion including a first guide portion and a support portion for supporting the first guide portion, the first guide portion being connected to the tongue side free ends of at least two of the tooth-receiving cavities in the anterior tooth region across the maxilla corresponding to the anterior tooth region, the first guide portion being provided at an incline with respect to the mandibular lower edge plane, thereby sliding some of the anterior teeth of the mandible along the first guide portion and driving the mandible to move forward to a target orthodontic position, the support portion being connected to the first guide portion and formed extending from the gingival ends of the multiple tooth-receiving cavities in the molar region toward the jaw side, and a portion of the support portion being supported by the maxilla when the appliance is attached.

[0009] The orthodontic treatment system includes a plurality of shell-shaped dental appliances, at least one of the plurality of shell-shaped dental appliances being a shell-shaped dental appliance as described above, the plurality of shell-shaped dental appliances having a geometry for adjusting a mandible from a first position to a second position and gradually positioning teeth from initial positions to target positions.

[0010] The shell-shaped dental appliance according to the present application includes a first guide part for adjusting the lower jaw to move along the sagittal direction in the jaw region, and a support part provided in the jaw region to be connected to the first guide part. After the shell-shaped dental appliance is worn, the first guide part can guide the lower jaw to move forward during the patient's occlusion process, and the reaction force generated when the first guide part and the support part provided in the jaw region move the lower jaw is applied to the patient's jaw, thereby reducing the adverse effect on the upper anterior teeth during the orthodontic treatment process of the lower jaw and improving the orthodontic treatment effect. In addition, the second guide part provided between the tooth-receiving cavity and the first guide part cooperates with the first guide part to not only solve the problem of lower jaw recession, but also further open the occlusion to solve the problems of deep bite and maxillary protrusion, thereby realizing the orthodontic treatment of protruding malocclusion in adolescents.

[0011] Furthermore, according to the present application, an orthodontic treatment system having a plurality of shell-shaped dental appliances is provided, in which at least two shell-shaped dental appliances used in succession have a first guiding portion and a second guiding portion, and the plurality of shell-shaped dental appliances realize the setting of a plurality of target positions between the initial position of orthodontic treatment and the end position of orthodontic treatment, thereby improving the comfort level during the orthodontic treatment process and avoiding the problem of molar open bite when opening the bite. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram of a shell-shaped dental appliance according to one embodiment of the present application. [Diagram 2] FIG. 2 is a schematic diagram of a front view of the shell-shaped dental appliance in FIG. 1. [Diagram 3] FIG. 2A is a cross-sectional view taken along line 2A-A' of FIG. [Figure 4] FIG. 2 is a schematic diagram of a shell-shaped dental appliance according to another embodiment of the present application. [Diagram 5] FIG. 5 is a cross-sectional view taken along line BB' in FIG. [Figure 6] 5 is another cross-sectional view taken along line BB' of FIG. 4. [Figure 7] 5 is yet another cross-sectional view taken along line BB' of FIG. 4. [Figure 8] FIG. 2 is a schematic diagram of a shell-shaped dental appliance according to another embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of a shell-shaped dental appliance according to another embodiment of the present application. [Figure 10] 10 is a cross-sectional view taken along line PP' in FIG. 9. [Figure 11] FIG. 2 is a schematic diagram of a shell-shaped dental appliance according to another embodiment of the present application. [Figure 12] FIG. 2 is a schematic diagram of a shell-shaped dental appliance according to another embodiment of the present application. [Figure 13] FIG. 2 is a schematic diagram of a shell-shaped dental appliance according to another embodiment of the present application. [Figure 14] FIG. 2 is a cross-sectional view of two shell-shaped dental appliances used sequentially in the orthodontic treatment system of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The technical problem to be solved by the present application is to provide a new shell-shaped dental appliance and orthodontic treatment system for orthodontic treatment of mandibular retrusion, deep bite, and maxillary prognathism in adolescents by eliminating the defects in the prior art. In the prior art, for cases of mandibular retrusion, a device capable of guiding the mandibular retrusion forward is usually provided on the lingual side of the maxillary dentition, but such a device usually causes the maxillary anterior teeth to receive the backward pulling force of the mandibular anterior teeth when guiding the mandibular anterior teeth forward, which results in unexpected lingual inclination of the maxillary anterior teeth. The present application reduces the possibility of lingual inclination of the maxillary anterior teeth by designing a device for guiding the mandibular anterior teeth forward and opening the bite in the jaw portion, by applying the unexpected action force generated when guiding the mandibular anterior teeth forward to the jaw portion and the adjustment portion of the jaw region.

[0014] The "back teeth region" according to the embodiments of the present application includes premolars and molars, and corresponds to teeth 4 to 8 in the FDI notation, based on the definition of tooth types in pp. 36-38 of "Guidelines for Oral Medicine", 2nd Edition, published by Peking University Medical Press, and the front teeth region includes teeth 1 to 3 in the FDI notation. The front teeth region includes central incisors, lateral incisors, and canines. Regarding the teeth in the deciduous stage, the "back teeth region" includes three types of teeth, deciduous incisors, deciduous canines, and deciduous molars, based on the definition of tooth types in pp. 40-41 of "Guidelines for Oral Medicine", 2nd Edition, published by Peking University Medical Press, and the deciduous incisors include deciduous central incisors and deciduous lateral incisors, and the deciduous molars include the first and second deciduous molars. The shell-shaped dental appliance in the present application is mainly attached to the maxillary dentition of deciduous teeth or the maxillary dentition in the mixed dentition stage.

[0015] In order to achieve the above object, the present application uses the following technical means.

[0016] The shell-shaped dental appliance is made of a polymeric material, is attached to the maxillary dentition, and includes a shell-shaped body 1, in which a plurality of tooth-receiving cavities 11 are provided, and an adjustment portion 2 for adjusting the relative positional relationship between the maxillary dentition and the mandible is provided in the jaw region of the shell-shaped body 1. In another embodiment, as shown in FIG. 1, the adjustment portion 2 includes a first guide portion 21 and a support portion 22 for supporting the first guide portion 21. The first guide portion 21 is connected to the lingual free ends of at least two tooth-receiving cavities 11 in the anterior tooth region across the maxillary dentition corresponding to the anterior tooth region. In another embodiment, as shown in FIG. 1, the first guide portion 21 is connected to the lingual free ends of all the tooth-receiving cavities 11 in the anterior tooth region, and is formed to extend from the lingual free ends of the at least two tooth-receiving cavities 11 in the anterior tooth region in a direction away from the opposing jaw and the anterior teeth. The lingual free end here specifically refers to an end portion close to the gingival side of the lingual side of the tooth-receiving cavities 11. Therefore, the lingual side of the tooth-receiving cavity 11 in the anterior tooth region connected to the first guide portion 21 does not cover all the lingual surfaces of the corresponding teeth. As shown in Fig. 2 and Fig. 3, the first guide portion 21 is provided inclined to the mandibular lower edge plane, so that some of the anterior teeth of the mandibular jaw can slide along the first guide portion 21 and the mandibular jaw can be driven to move forward to the target orthodontic position, and the mandibular lower edge plane refers to a plane formed by the mesial adjacent point of the mandibular central incisor and the distal buccal cusp of the last molar on both sides of the mandibular jaw. After the shell-shaped dental appliance of the present application is attached to the upper jaw of a patient, the incisal edge of the mandibular anterior tooth slides forward to the target orthodontic position along the first guide surface 211 of the first guide portion 21 during the occlusion process. The first guide surface 211 is a curved surface that matches the shape of the dental arch, and the angle between a tangent plane passing through any point on the first guide surface 211 and the mandibular lower edge plane is greater than 0° and less than 45°, so that the incisal edge of the mandibular anterior tooth contacts the first guide surface 211 and slides along the first guide surface 211.

[0017] In another embodiment, the first guide portion 21 is provided with a first guide surface 211 which is a curved surface, and the angle between a tangent plane passing through any point on the first guide surface 211 and the mandibular lower border plane is greater than 0° and less than 45°.

[0018] In another embodiment, the maxillary-fitting surface of support 22 conforms to the surface of the palatine fold in a corresponding position.

[0019] As shown in Figs. 1 and 2, the support 22 is formed to extend from the lingual gingival end of the multiple tooth-receiving cavities 11 in the molar region toward the jaw region, or the support 22 is formed to extend from the lingual gingival end of the multiple tooth-receiving cavities 11 in the molar region and a portion of the multiple tooth-receiving cavities 11 in the anterior tooth region toward the jaw region, and the portion adjacent to the anterior tooth region extends to be connected to the first guide portion 21. When the shell-shaped dental appliance is worn, a part of the support 22 is supported by the upper jaw. In another embodiment, as shown in Fig. 2, the support 22 is in close contact with the upper jaw adjacent to the teeth in the molar region and is in close contact with the upper jaw corresponding to the 3rd and 4th teeth, and the portion of the support 22 that is in close contact with the surface of the upper jaw fits the surface of the palatine fold at the corresponding position, i.e., the surface of the support 22 that is in close contact with the upper jaw matches the surface structure of the palatine fold at the corresponding position and is in close contact with each other. The support part 22 mainly functions to strengthen the integrity of the adjustment part 2 and improve the strength of the adjustment part 2 when the first guiding part 21 guides the lower jaw forward, thereby making it difficult for the first guiding part 21 to deform when guiding the lower jaw to move forward. In addition, the connection relationship between the support part 22 and the first guiding part 21 adjusts a part of the unexpected acting force generated when guiding the lower jaw forward to the upper jaw region where the support part 22 and the support part 22 are in close contact with each other, thereby reducing unexpected lingual inclination of the upper anterior teeth.

[0020] In another embodiment, as shown in Fig. 3 and Fig. 4, the adjustment part 2 further includes a second guide part 23, and the second guide part 23 is provided so that a tooth proximal end is connected to the lingual free ends of at least two tooth receiving cavities 11 in the anterior tooth region, and a tooth distal end is connected to the tooth proximal end of the first guide part 21. In another embodiment, the second guide part 23 is connected to the lingual free ends of all tooth receiving cavities 11 in the anterior tooth region, and the tooth receiving cavities 11 connected to the second guide part 23 cover only the labial side and incisal part of the corresponding tooth. The second guide part 23 is provided with a second guide surface 231 that presses down the mandibular anterior tooth, and the part of the second guide surface 231 that contacts the incisal edge of the mandibular anterior tooth is a plane perpendicular to the long axis of the tooth of the mandibular anterior tooth. Preferably, as shown in FIG. 5, the cross-sectional shape of the second guiding portion 23 and the first guiding portion 21 on the sagittal plane is an inverted V-shape, i.e., the cross section of the first guiding surface 211 and the second guiding surface 231 on the sagittal plane is an inverted V-shape, the angle α of the inverted V-shape being greater than 45° and not greater than 150°, and when worn, the incisal edges of some of the lower jaw anterior teeth are located at the connection point between the second guiding portion 23 and the first guiding portion 21.

[0021] In another embodiment, the second guiding portion 23 is provided with a second guiding surface 231 that presses down the mandibular anterior teeth, and the portion of the second guiding surface 231 that contacts the incisal edge of the mandibular anterior teeth is a plane perpendicular to the long axis of the mandibular anterior teeth.

[0022] 4, in another embodiment, the first guiding portion 21 is provided symmetrically with respect to the tooth midline, and / or the second guiding portion 23 is provided symmetrically with respect to the tooth midline. When provided symmetrically with respect to the tooth midline, the acting force received by the adjustment portion 2 is also symmetric with respect to the tooth midline, so that the acting forces can be balanced.

[0023] In another embodiment, the projection of the first guide portion 21 onto the horizontal plane has a minimum length in the sagittal direction which is the distance the mandible needs to move in the sagittal direction according to the orthodontic treatment plan.

[0024] In another embodiment, the distance between the connection point and the palatine rugae is between 0 and 2 mm.

[0025] As shown in Figs. 5 and 6, the projection of the first guide portion 21 onto the horizontal plane has a minimum length x in the sagittal direction, which is the distance the mandible needs to move in the sagittal direction according to the orthodontic treatment plan. After the patient wears the shell-shaped dental appliance, during the occlusion process, the incisal edge of the mandibular anterior tooth slides along the first guide portion 21 to the connection point between the first guide portion 21 and the second guide portion 23, and is finally stably held at the connection point. The distance H1 between the connection point and the palatine fold is 0-2 mm, which can adjust the vertical positional relationship between the upper and lower jaws and open the bite in cases of overbite and maxillary prognathism. The shell-shaped dental appliance generally needs to be worn for 7-14 days, during which the growth and development of the mandible can be stimulated continuously and long-term, so that the mandibular muscles form a new biomechanical equilibrium in a new position, and can still be continuously held in the target position after being removed from the mandible.

[0026] In another embodiment, as shown in Fig. 6, the first guide portion 21 has a first jaw side surface which is a surface adjacent to the jaw side of the first guide portion 21, and a vertical distance H2 between the first jaw side surface and the palatine fold is 0 to 2 mm. When the distance between the first jaw side surface and the palatine fold is 0 mm, the first jaw side surface is provided so as to closely contact the palatine fold. In another embodiment, the surface structure of the first jaw side surface matches the surface structure of the palatine fold at a corresponding position, and the surface structure of the first jaw side surface is completely in close contact with the palatine fold, improving comfort when worn and enhancing the strength of the adjustment portion 2.

[0027] In another embodiment, as shown in Fig. 7, the second guide portion 23 does not at least partially contact the lingual surface of the tooth 3 in the anterior tooth region. In another embodiment, during the wearing process, the second guide portion 23 always maintains a gap with respect to the lingual surface of the corresponding tooth 3, which can effectively reduce unexpected acting force applied to the corresponding tooth 3 during the use process of the second guide portion 23. In some cases, the material of the second guide portion 23 can be changed to a material having a stiffness greater than that of the tooth-receiving cavity 11, thereby improving the deformation resistance of the second guide portion 23.

[0028] In another embodiment, the tooth-receiving cavity 11 in the anterior region does not contact the labial side of the corresponding anterior tooth. For example, the inner labial surface of the tooth-receiving cavity 11 in the anterior region and the outer surface of the corresponding anterior tooth are spaced apart, or the labial side of the tooth-receiving cavity 11 in the anterior region is openworked, as shown in Fig. 8, in the shell-shaped dental appliance, the labial side of the tooth-receiving cavity 11 in the anterior region is openworked. Thus, during the process of wearing the shell-shaped dental appliance, the tooth-receiving cavity 11 in the anterior region does not apply any orthodontic or other force to the anterior tooth.

[0029] In another embodiment, as shown in FIG. 9, FIG. 10, and FIG. 11, the support part 22 and the first guide part 21 are connected via a connection part 221, and the tongue guide part 211a is provided on the connection part 221. The tongue guide part 211a guides the tongue tip to adjust to a target orthodontic position, and specifically, the patient can eliminate the change in the dental arch and alveolar bone shape caused by poor tongue habits by licking the tongue guide part 211a for a long period of time. Many children's malocclusions are caused by poor oral habits, and the shell-shaped dental appliance in the present application adjusts the malocclusion and at the same time designs the tongue guide part 211a to perform synchronous orthodontic treatment on the tongue, thereby eliminating the second malocclusion caused by poor tongue habits after the completion of the subsequent orthodontic treatment. In another embodiment, the tongue guide part 211a is a geometric structure that protrudes or is recessed toward the tongue. As shown in FIG. 10, when the tongue guide part 211a is a geometric structure that protrudes toward the tongue, it is a solid structure or a closed hollow structure. When the tongue guide portion 211a has a geometric structure recessed along the tongue direction, the tongue guide portion 211a can be formed directly recessed from the surface of the connection portion 221 toward the front teeth region as shown in Fig. 11. The tongue guide portion 211a may be designed to have a semicircular, triangular or other polygonal structure.

[0030] In another embodiment, the elastic modulus of the first guide 21 is greater than that of the shell-shaped body 1, ensuring that the first guide 21 is not deformed during use, and improving the accuracy of orthodontic treatment. For example, the material of the shell-shaped body 1 may be selected from materials having an elastic modulus in the range of 0.2 Mpa to 500 Mpa, and the material of the first guide 21 may be selected from materials having an elastic modulus in the range of 0.5 Mpa to 600 Mpa. Alternatively, the first guide 21 may be designed to have a rigidity greater than that of the shell-shaped body 1, for example, the first guide 21 uses a solid structure or a laminated structure, and when the above structure is used, the shell-shaped dental appliance can be manufactured by an additive manufacturing method.

[0031] In another embodiment, the first guide portion 21 has a reinforcing portion 4 arranged along the sagittal direction.

[0032] In another embodiment, the adjustment part 2 is designed with a reinforcing rib to improve the deformation resistance of the adjustment part 2 and improve the accuracy of orthodontic treatment. As shown in FIG. 12, the reinforcing part 4 may be provided on the surface of the connection part 221, and is a plurality of protruding or recessed structures formed on the surface of the connection part 221. Alternatively, as shown in FIG. 13, the reinforcing part 4 is provided on the first guide surface 211 of the first guide part 21. In another embodiment, the reinforcing part 4 is a reinforcing rib that protrudes or recesses a part of the first guide part 21 toward the tongue direction, and the reinforcing part 4 needs to be provided along the sagittal direction to avoid being an obstacle when the mandibular anterior teeth slide on the first guide part 21.

[0033] The present application further includes an orthodontic treatment system, the orthodontic treatment system including a plurality of shell-shaped dental appliances, at least one of the plurality of shell-shaped dental appliances being the shell-shaped dental appliance according to any one of the above-mentioned embodiments, the plurality of shell-shaped dental appliances having a geometry for adjusting the mandible from a first position to a second position and gradually positioning the teeth from an initial position to a target position, after the orthodontic treatment is completed, the final target position is usually one in which the mandibular incisors have a normal labial inclination and are located below the maxillary incisor band.

[0034] In another embodiment, as shown in Fig. 14, the adjustment section 2 of at least two shell-shaped dental appliances used consecutively included in the orthodontic treatment system has a second guide portion 23, the tooth proximal end of the second guide portion 23 is provided to be connected to the lingual free end of the at least two tooth-receiving cavities 11 in the anterior tooth region, and the tooth distal end is provided to be connected to the tooth proximal end of the first guide portion 21, the cross-sectional shapes of the second guide portion 23 and the first guide portion 21 in the sagittal plane are inverted V-shaped, and when worn, the incisal edges of some anterior teeth of the mandible are located at the connection points of the second guide portion 23 and the first guide portion 21. The angle α between the first guide surface 211 and the second guide surface 231 gradually increases in different shell-shaped dental appliances as the orthodontic treatment process progresses. In another embodiment, the vertical distance H1 between the connection point of the shell dental appliance for the next step and the palatine fold of at least two shell dental appliances used consecutively is greater than the vertical distance H1 between the connection point of the shell dental appliance for the previous step and the palatine fold. As the orthodontic treatment process progresses, the vertical distance H1 between the connection point of the shell dental appliance for the next step and the palatine fold is 0.1 mm greater than the vertical distance H1 between the connection point of the shell dental appliance for the previous step and the palatine fold. The shell dental appliance with the second guide portion 23 in the orthodontic treatment system can be designed to gradually realize the solution of overbite and maxillary prognathism by pushing down the lower anterior teeth to open the bite. The advantage of designing the pressure step by step is to avoid the problem of molar open bite caused by pushing down the lower anterior teeth in one step.

[0035] The "previous step" and the "next step" specifically refer to the fact that one shell-shaped dental appliance must be worn at each orthodontic treatment step in the orthodontic treatment process. Therefore, the "shell-shaped dental appliance for the previous step" and the "shell-shaped dental appliance for the next step" refer to the shell-shaped dental appliance at a certain step and the shell-shaped dental appliance at the subsequent step among at least two shell-shaped dental appliances used consecutively. In general, the wearing cycle of the shell-shaped dental appliance in this application is 7 to 14 days.

[0036] In another embodiment, the projections of the first guide portion 21 of at least two shell-shaped dental appliances used consecutively in the orthodontic treatment system onto the horizontal plane have the same minimum length in the sagittal direction. Alternatively, as shown in FIG. 14, the minimum length in the sagittal direction (x direction in the figure) of the projections of the first guide portion 21 of the shell-shaped dental appliance for the next step of at least two shell-shaped dental appliances used consecutively onto the horizontal plane is greater than the minimum length in the sagittal direction of the projections of the first guide portion 21 of the shell-shaped dental appliance for the previous step onto the horizontal plane. L in FIG. 14 is the difference in the minimum length in the sagittal direction of the projections of the first guide portion 21 onto the horizontal plane in two consecutive steps, and the value of L is in the range of 0.1 mm to 0.2 mm. The minimum length of the projections of the first guide portion 21 onto the horizontal plane in the sagittal direction is the distance at which the first guide portion 21 guides the mandible to slide forward in the sagittal direction.

[0037] In addition, the above examples can be freely combined as necessary to form various new embodiments, provided no contradictions arise. Any embodiments formed by such combinations are included in the scope of protection of the present application, and due to space limitations, a description thereof will be omitted here.

[0038] The above description is only a preferred embodiment of the present application, and it should be understood that those skilled in the art can make several improvements and modifications without departing from the principles of the present application, and these improvements and modifications should also fall within the scope of protection of the present application.

[0039] Similarly, the above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any changes or replacements that a person skilled in the art can easily think of within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims described.

Claims

1. 1. A shell-shaped dental appliance placed on the maxillary dentition, comprising: A shell-like body, The shell-like body is provided with a plurality of tooth-receiving cavities; The jaw region of the shell-shaped body is provided with an adjustment portion for adjusting the relative positional relationship between the upper jaw and the lower jaw, the adjustment unit includes a first induction unit and a support unit that supports the first induction unit, The first guide portion is connected to a lingual free end of at least two of the plurality of tooth-receiving cavities in the anterior tooth region across the upper jaw corresponding to the anterior tooth region; The first guide portion is provided at an incline with respect to a lower edge plane of the mandible, thereby sliding a part of the anterior teeth of the mandible along the first guide portion and driving the mandible to move forward to a target orthodontic position; The support portion is connected to the first guide portion and is formed to extend from the gingival end of the plurality of tooth-receiving cavities in the molar region toward the jaw side, and a part of the support portion is supported by the upper jaw when the tooth-receiving cavities are attached to the molar region. Shell-shaped dental instrument.

2. The first guide portion is formed to extend from a lingual free end of at least two of the tooth-receiving cavities in the anterior tooth region in a direction away from the opposing jaw and the anterior tooth.

10. The shell-shaped dental appliance of claim 1.

3. The first guide portion is provided with a first guide surface which is a curved surface, and an angle between a tangent plane passing through any one point on the first guide surface and the mandibular lower edge plane is greater than 0° and less than 45°.

3. The shell-shaped dental appliance of claim 2.

4. The adjustment unit further includes a second induction unit, The second guide portion is provided such that a tooth-proximal end is connected to a lingual free end of at least two of the tooth-receiving cavities in the anterior tooth region; A tooth distal end is provided to be connected to the tooth proximal end of the first guide portion.

4. A shell-shaped dental appliance according to claim 2 or 3.

5. The second guide portion is provided with a second guide surface that presses down the mandibular anterior teeth, A portion of the second guide surface that contacts the incisal edge of the mandibular anterior tooth is a plane perpendicular to the long axis of the mandibular anterior tooth.

5. The shell-shaped dental appliance of claim 4.

6. a cross-sectional shape of the second guide portion and the first guide portion in a sagittal plane is an inverted V-shape, an angle of the inverted V-shape is greater than 45° and less than 150°, and when the jaw is attached, an incisal edge of a part of a front tooth of the mandible is located at a connection point between the second guide portion and the first guide portion; 6. A shell-shaped dental instrument according to claim 4 or 5.

7. The projection of the first guide portion onto a horizontal plane has a minimum length in the sagittal direction that is the distance the mandible needs to move in the sagittal direction according to the orthodontic treatment plan. A shell-shaped dental appliance according to any one of claims 1 to 6.

8. The distance between the connection point and the palatine rugae is 0-2 mm.

7. The shell-shaped dental appliance of claim 6.

9. The first guide portion has a first jaw side surface, and a vertical distance between the first jaw side surface and the palatine fold is 0 to 2 mm. A shell-shaped dental appliance according to any one of claims 1 to 8.

10. the surface structure of the first jaw side conforms to the surface structure of a correspondingly located palatine rugae; 10. The shell-shaped dental appliance of claim 9.

11. The second guide portion does not at least partially contact a lingual surface of a tooth in the anterior tooth region. A shell-shaped dental appliance according to any one of claims 4 to 10.

12. The first induction portion is provided symmetrically with respect to the tooth center line. A shell-shaped dental appliance according to any one of claims 1 to 11.

13. The second guide portion is provided symmetrically with respect to the tooth center line. A shell-shaped dental appliance according to any one of claims 4 to 12.

14. At least two of the tooth-receiving cavities in the anterior tooth region do not contact the labial surfaces of the corresponding anterior teeth. A shell-shaped dental appliance according to any one of claims 1 to 13.

15. The inner surfaces of the labial sides of the at least two tooth-receiving cavities in the anterior tooth region and the outer surfaces of the corresponding anterior teeth are spaced apart, or the labial sides of the at least two tooth-receiving cavities in the anterior tooth region are openworked.

15. The shell-shaped dental appliance of claim 14.

16. The support portion and the first guide portion are connected via a connection portion, The connection portion is provided with a tongue guide portion, The tongue guide portion is a geometric structure that protrudes or recesses toward the tongue direction. A shell-shaped dental appliance according to any one of claims 1 to 15.

17. When the tongue guide portion is a geometric structure that protrudes toward the tongue direction, the tongue guide portion is a solid structure.

17. The shell-shaped dental appliance of claim 16.

18. When the tongue guide portion is a geometric structure that protrudes toward the tongue direction, it is a closed hollow structure.

17. The shell-shaped dental appliance of claim 16.

19. the surface of the support that contacts the maxilla conforms to the surface of the palatine fold at a corresponding position; A shell-shaped dental appliance according to any one of claims 1 to 18.

20. The elastic modulus of the first guide portion is greater than the elastic modulus of the shell-shaped body. A shell-shaped dental appliance according to any one of claims 1 to 19.

21. The rigidity of the first guide portion is greater than the rigidity of the shell-shaped main body. A shell-shaped dental appliance according to any one of claims 1 to 20.

22. The first guide portion has a reinforcing portion provided along the sagittal direction.

22. The shell-shaped dental appliance of claim 21.

23. The reinforcing portion is a reinforcing rib that protrudes or is recessed toward the tongue direction of the first guide portion.

23. The shell-shaped dental appliance of claim 22.

24. a plurality of shell-shaped dental instruments; At least one shell-shaped dental appliance of the plurality of shell-shaped dental appliances is a shell-shaped dental appliance according to any one of claims 1 to 23; a plurality of said shell-like dental appliances having a geometry for adjusting the jaw from a first position to a second position and for gradually positioning the teeth from initial positions to target positions; Orthodontic treatment system.

25. the adjustment portion of at least two of the consecutively used shell-shaped dental appliances among the plurality of shell-shaped dental appliances further includes a second guide portion; the second guide portion is provided such that a tooth proximal end is connected to the lingual free ends of at least two of the tooth-receiving cavities in the anterior tooth region, and a tooth distal end is connected to the tooth proximal end of the first guide portion; A cross-sectional shape of the second guide portion and the first guide portion in a sagittal plane is an inverted V shape, and when attached, the incisal edge of a part of a front tooth of the lower jaw is located at a connection point between the second guide portion and the first guide portion.

25. The orthodontic treatment system of claim 24.

26. a vertical distance between the connection point of a shell-shaped dental appliance for a next step and the palatine fold of at least two shell-shaped dental appliances used in succession is greater than a vertical distance between the connection point of a shell-shaped dental appliance for a previous step and the palatine fold; 26. The orthodontic treatment system of claim 25.

27. the projections of the first guide portions of at least two of the shell-shaped dental appliances used in succession on a horizontal plane have the same minimum length in the sagittal direction; 25. The orthodontic treatment system of claim 24.

28. a minimum length in the sagittal direction of a projection of the first lead-in portion of the shell-shaped dental appliance for the next step of at least two of the shell-shaped dental appliances used in succession onto a horizontal plane is greater than a minimum length in the sagittal direction of a projection of the first lead-in portion of the shell-shaped dental appliance for the previous step onto a horizontal plane; 25. The orthodontic treatment system of claim 24.

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