Maxillary tooth corrector

Abstract

The utility model discloses an upper jaw tooth corrector which comprises a shell-shaped corrector, the shell-shaped corrector comprises a shell-shaped corrector main body and a transverse jaw arch, and the shell-shaped corrector main body is provided with a plurality of tooth storage cavities; a transverse jaw arch at least partially spans the tooth arch width of the shell-shaped appliance main body, and the two ends of the transverse jaw arch are connected to the lingual sides of the rear tooth areas on the left side and the right side of the shell-shaped appliance main body respectively; when the shell-shaped appliance is worn on the dentition of the upper jaw, the transverse jaw arch and the upper jaw are arranged at an interval, and the face, away from the upper jaw, of the transverse jaw arch forms a tongue acting face. Compared with the prior art, after the maxillary orthodontic appliance is worn on the dentition of the maxillary, when the tongue licks and presses the tongue acting surface of the transverse jaw arch, the transverse jaw arch is pressed to bend towards the maxillary, and the two sides of the transverse jaw arch are retracted inwards, so that the back tooth region of the shell-shaped orthodontic appliance body can be driven to be retracted inwards to generate orthodontic force on cheek-inclined back teeth, and the cheek-inclined back teeth are vertical.

Description

TECHNICAL FIELD

[0001] The application relates to a maxillary tooth corrector and belongs to the technical field of oral appliances. BACKGROUND

[0002] Dental malformation is one of the three major oral diseases and has a high prevalence rate. Most dental malformations are caused by congenital genetic factors or acquired environmental factors during growth and development. Dental malformation brings great harm to the oral cavity and even the whole body, such as affecting the development of the jaw face, affecting oral health, affecting oral function, and affecting appearance, and the like. At present, patients mainly correct dental malformation through surgical operation or wearing a corrector.

[0003] In the process of closing the interdental space by using a hidden aligner, especially in the treatment step of incisor retraction, the aligner will generate an unexpected expansion force on the posterior teeth, which will cause the posterior teeth to be unexpectedly inclined buccally, which needs to be avoided as much as possible in the treatment process. SUMMARY

[0004] The application aims to provide a maxillary tooth corrector.

[0005] To achieve one of the above application purposes, one embodiment provides a maxillary tooth corrector, which comprises a shell-shaped corrector, and the shell-shaped corrector comprises:

[0006] a shell-shaped corrector body having a plurality of tooth receiving cavities;

[0007] a transverse arch spanning at least part of the dental arch width of the shell-shaped corrector body, two ends of the transverse arch being connected to the lingual side of the posterior tooth area on the left and right sides of the shell-shaped corrector body respectively; when the shell-shaped corrector is worn on the dentition of the maxilla, the transverse arch is arranged spaced apart from the maxilla, and the side of the transverse arch away from the maxilla constitutes a lingual action surface.

[0008] In one embodiment of the application, the transverse arch is connected within the range of the tooth receiving cavity corresponding to tooth positions 5-7.

[0009] In one embodiment of the application, the shell-shaped corrector body has a connecting portion connected with the transverse arch, and the connecting portion is arranged at the tooth receiving cavity accommodating the buccally inclined posterior teeth.

[0010] In one embodiment of the application, the maxillary tooth corrector comprises N shell-shaped correctors corresponding to N successive treatment steps respectively, and N≥2; each shell-shaped corrector is used to reposition the target treatment tooth from the initial layout of the corresponding treatment step to the target layout of the corresponding treatment step.

[0011] In the N shell-shaped aligners, the distance d from the top end of the transverse palatal arch close to the upper jaw to the corresponding position on the upper jaw is positively correlated with the initial number of the buccal inclined posterior teeth of the corresponding alignment step.

[0012] In an embodiment of the present application, the maxillary tooth aligner comprises N shell-shaped aligners corresponding to N successive alignment steps respectively, N≥2; each of the shell-shaped aligners is used to reposition the target treatment teeth from the initial layout of the corresponding alignment step to the target layout of the corresponding alignment step.

[0013] In the N shell-shaped aligners, the distance d from the top end of the transverse palatal arch close to the upper jaw to the corresponding position on the upper jaw is positively correlated with the initial number of the buccal inclined posterior teeth of the corresponding alignment step.

[0014] In an embodiment of the present application, the distance d from the top end of the transverse palatal arch close to the upper jaw to the corresponding position on the upper jaw is 3-7 mm.

[0015] In an embodiment of the present application, the distance d is 5-7 mm.

[0016] In an embodiment of the present application, in the sagittal direction, the transverse palatal arch is located in the posterior tooth area of the shell-shaped aligner body.

[0017] In an embodiment of the present application, the transverse palatal arch is in the shape of a strip.

[0018] In an embodiment of the present application, the connection width between the transverse palatal arch and the shell-shaped aligner body is ≥2 mm.

[0019] In an embodiment of the present application, the transverse palatal arch comprises a body, and a tongue-acting portion is arranged on the body away from the upper jaw close to the midline position of the upper jaw, and the tongue-acting portion protrudes out of the body in the direction of the anterior teeth.

[0020] In an embodiment of the present application, the transverse palatal arch comprises a body and at least one bending portion, and at least one of the bending portions is arranged at one end of the body in the direction of the anterior teeth.

[0021] In an embodiment of the present application, the transverse palatal arch comprises two bending portions, and the two bending portions are arranged at one end of the body in the direction of the anterior teeth and at one end of the body away from the anterior teeth respectively, and the openings formed by the two bending portions and the body are directed towards each other.

[0022] In an embodiment of the present application, the bending portion is in the shape of an arc and is folded upward in the sagittal direction from the body.

[0023] In an embodiment of the present application, the transverse palatal arch is in the shape of a curved arch, and the curved shape is substantially the same as the corresponding upper jaw contour.

[0024] In one embodiment of the present application, the transpalatal arch and the shell-shaped appliance body are integrally formed or separately formed.

[0025] Compared with the prior art, the embodiment of the present application has the beneficial effect that when the maxillary dental aligner is worn on the dentition of the upper jaw, the transpalatal arch is pressed towards the upper jaw and retracted on both sides when the tongue licks the lingual surface of the transpalatal arch, thereby driving the posterior tooth area of the shell-shaped appliance body to retract, so as to generate a correction force on the buccally inclined posterior teeth to make them vertical. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of a maxillary dental aligner according to an embodiment of the present application;

[0027] Figure 2 is a structural schematic diagram and a stress deformation schematic diagram of a maxillary dental aligner according to an embodiment of the present application;

[0028] Figure 3 is a structural schematic diagram of a maxillary dental aligner according to an embodiment of the present application when worn on the dentition of the upper jaw;

[0029] Figure 4 is a structural schematic diagram of a maxillary dental aligner according to another embodiment of the present application when worn on the dentition of the upper jaw, which illustrates the case when the posterior teeth are in a buccally inclined state;

[0030] Figure 5 is a sectional schematic diagram of a transpalatal arch along the sagittal direction according to an embodiment of the present application.

[0031] 10, shell-shaped aligner; 11, shell-shaped appliance body; 111, connecting portion; 12, transpalatal arch; 120, lingual surface; 121, lingual acting portion; 122, body; 123, bending portion; 20, posterior tooth; 21, buccally inclined posterior tooth; 30, upper jaw. DETAILED DESCRIPTION

[0032] The present application will be described in detail below. However, these embodiments do not limit the present application, and any changes in structure, method, or function made by those of ordinary skill in the art based on these embodiments are included in the protection scope of the present application.

[0033] One embodiment of the present application provides a maxillary dental aligner which can be worn on the dentition of the upper jaw and used for correcting the upper teeth.

[0034] Reference is made to Figures 1 to 4The maxillary orthodontic appliance includes a shell-shaped appliance 10. The shell-shaped appliance 10 includes a shell-shaped appliance body 11 and a transverse palatal arch 12. The shell-shaped appliance body 11 has multiple tooth receiving cavities for accommodating teeth. The transverse palatal arch 12 at least partially spans the width of the dental arch of the shell-shaped appliance body 11, and its two ends are respectively connected to the lingual side of the posterior tooth area on the left and right sides of the shell-shaped appliance body 11. When the shell-shaped appliance 10 is worn on the maxillary dentition, the transverse palatal arch 12 is spaced apart from the maxilla 30, and the side of the transverse palatal arch 12 facing away from the maxilla 30 constitutes the lingual action surface 120.

[0035] In this way, after the maxillary orthodontic appliance is worn on the maxillary dentition, the tongue can press the tongue action surface 120 of the transpalatal arch 12. At this time, since the transpalatal arch 12 and the maxilla 30 are spaced apart, that is, there is a gap between the transpalatal arch 12 and the maxilla 30, the transpalatal arch 12 can bend towards the maxilla 30 under pressure, and the two sides of the transpalatal arch 12 retract inward, thereby driving the posterior tooth area of ​​the shell-shaped orthodontic appliance body 11 to retract inward, so as to generate orthodontic force on the buccal tilted posterior teeth 21 and make them vertical.

[0036] Of course, this maxillary orthodontic appliance is not limited to the scenarios mentioned in the background art, but can also be used in other scenarios where posterior teeth may exhibit buccal tilt.

[0037] See Figure 2 Before the tongue presses against the transverse palatal arch 12, the transverse palatal arch 12 is as... Figure 2 As shown in Figure 12, when the tongue presses against the transverse palatal arch 12, the transverse palatal arch 12 is pressed and bends towards the palate 30, deforming into the shape shown in Figure 12. Figure 2 The shape shown in 12' is concave on both sides.

[0038] The shell-shaped orthodontic appliance 11, specifically the main body 11, can be a transparent component formed from polymer material through a hot-press molding process, also known as an invisible orthodontic appliance. It forms a cavity to accommodate the teeth, comprising multiple interconnected tooth-accommodating chambers that collectively form the cavity. This cavity has a geometry that repositions the patient's teeth from a first layout to a second layout. The geometry of the cavity is determined based on and substantially matches the second layout of the patient's teeth.

[0039] When the shell-shaped orthodontic appliance 10 is worn on the dentition, the shell-shaped orthodontic appliance body 11 covers the outside of the dentition and the dentition can be seen through the shell-shaped orthodontic appliance body 11, and the teeth in the dentition are respectively accommodated in their respective tooth-accommodating cavities.

[0040] The shell-shaped orthodontic appliance body 11 is divided into an anterior tooth region and two posterior tooth regions on both sides. The anterior tooth region of the shell-shaped orthodontic appliance body 11 corresponds to the anterior tooth region in the dentition; the posterior tooth region of the shell-shaped orthodontic appliance body 11 corresponds to the posterior tooth region in the dentition. Understandably, the two posterior tooth regions on both sides of the shell-shaped orthodontic appliance body 11 are divided into the left posterior tooth region and the right posterior tooth region.

[0041] Here, the terms "anterior region" and "posterior region" are defined according to the classification of teeth in the 2nd edition of "Introduction to Stomatology" published by Peking University Medical Press, pages 36-38. The anterior region includes incisors, lateral incisors, and canines, which are marked as 1-3 in the FDI notation. The posterior region includes the first premolar, second premolar, first molar, second molar, and third molar, which are marked as 4-8 in the FDI notation.

[0042] Additionally, the sagittal plane is an anatomical term. When the human body is divided into left and right halves, the left and right sections are called the sagittal plane, and a section with equal left and right sides is called the median sagittal plane. According to the medical imaging technology terminology published in 2020, the sagittal direction is the direction in which the central ray of an X-ray enters from the front or back of the patient's body, parallel to the sagittal plane.

[0043] The transverse palatal arch 12 connects to the tooth receiving cavity corresponding to positions 5-7. Specifically, the end of the transverse palatal arch 12 connecting to the left posterior tooth region of the shell-shaped appliance body 11 is located in the tooth receiving cavity corresponding to positions 5-7 on the left posterior tooth region, and the end connecting the transverse palatal arch 12 to the right posterior tooth region of the shell-shaped appliance body 11 is located in the tooth receiving cavity corresponding to positions 5-7 on the right posterior tooth region. After the shell-shaped appliance 10 is worn on the maxillary dentition, the tongue can press against the lingual action surface 120 of the transverse palatal arch 12, causing the transverse palatal arch 12 to bend towards the maxilla 30. The sides of the transverse palatal arch 12 retract inwards, and the area of ​​the shell-shaped appliance body 11 corresponding to positions 5-7, which is connected to the transverse palatal arch 12, experiences a relatively large inward retraction force. Therefore, even when teeth 5-7 have a tendency to buccal tilt or have already tilted buccally, the tongue can act on the transverse palatal arch 12 to correct buccal tilt.

[0044] The shell-shaped orthodontic appliance body 11 has a connecting part 111 that connects to the transverse jaw arch 12.

[0045] See Figure 4In the case of the crown of the posterior tooth 20 being buccally inclined, i.e. the crown being inclined toward the buccal side, the connecting portion 111 is arranged at the tooth receiving cavity receiving the buccally inclined posterior tooth 21. In this way, when the crown of the posterior tooth 20 is already buccally inclined, the buccally inclined posterior tooth 21 is received in the tooth receiving cavity, and the transpalatal arch 12 is pressed toward the palate 30 by the tongue to bend the transpalatal arch 12, and the sufficient arch contraction force is provided to the shell-shaped appliance main body 11 to achieve the treatment of the buccally inclined posterior tooth 21.

[0046] In an embodiment, the maxillary dental appliance comprises N shell-shaped appliances corresponding to N successive treatment steps respectively, N≥2 and N is a natural number.

[0047] In the treatment of the target treatment teeth by the maxillary dental appliance, the target treatment teeth are repositioned from an initial arrangement to a target arrangement, and the whole treatment process is divided into N successive treatment steps, and each treatment step repositions the target treatment teeth from an initial arrangement of the treatment step to a target arrangement of the treatment step. Basically, in the N treatment steps, the target arrangement of an Mth treatment step (1≤M

[0048] In the maxillary dental appliance, the N shell-shaped appliances 10 correspond to N successive treatment steps respectively. Each shell-shaped appliance 10 is used to reposition the target treatment teeth from an initial arrangement of the corresponding treatment step to a target arrangement of the corresponding treatment step.

[0049] In the embodiment, the target treatment teeth include but are not limited to the buccally inclined posterior tooth 21.

[0050] In the N shell-shaped appliances 10, the distance d from the side top end of the transpalatal arch 12 close to the palate 30 to the corresponding position of the palate 30 is positively correlated with the initial buccal inclination angle of the buccally inclined posterior tooth 21 of the corresponding treatment step. The buccal inclination angle refers to the included angle between the buccally inclined posterior tooth 21 and the position of the buccally inclined posterior tooth 21 in the vertical state along the buccal-lingual direction, and the initial buccal inclination angle refers to the buccal inclination angle of the buccally inclined posterior tooth 21 in the initial arrangement of the corresponding treatment step. In other words, in the N treatment steps, if the initial buccal inclination angle of the buccally inclined posterior tooth 21 of an M+1th treatment step is smaller than the initial buccal inclination angle of the buccally inclined posterior tooth 21 of an Mth treatment step, the distance d in the M+1th shell-shaped appliance 10 is smaller than the distance d in the Mth shell-shaped appliance 10; wherein the Mth shell-shaped appliance 10 corresponds to the Mth treatment step, and the M+1th shell-shaped appliance 10 corresponds to the M+1th treatment step.

[0051] When the initial buccal inclination angle of the buccally inclined posterior tooth 21 is relatively large, by setting the distance d from the top end of the transpalatal arch 12 close to the palate 30 to the corresponding position of the palate 30 to be relatively large, the transpalatal arch 12 can have a larger movement space when moving towards the palate 30, and when the tongue exerts force on the transpalatal arch 12, the transpalatal arch 12 can bend towards the palate 30 to a greater extent, thereby providing the shell-shaped appliance body 11 with a larger arch contraction force and a larger negative torque, thereby providing the buccally inclined posterior tooth 20 with a larger lingual force.

[0052] In addition, in the N shell-shaped appliances 10, the distance d from the top end of the transpalatal arch 12 close to the palate 30 to the corresponding position of the palate 30 is positively correlated with the initial number of buccally inclined posterior teeth 21 of the corresponding treatment step. The initial number of buccally inclined posterior teeth 21 refers to the number of buccally inclined posterior teeth 21 in the initial layout of the corresponding treatment step. In other words, in the N treatment steps, if the initial number of buccally inclined posterior teeth 21 of the M+1th treatment step is less than the initial number of buccally inclined posterior teeth 21 of the Mth treatment step, the d in the M+1th shell-shaped appliance 10 is less than the d in the Mth shell-shaped appliance 10; wherein the Mth shell-shaped appliance 10 corresponds to the Mth treatment step, and the M+1th shell-shaped appliance 10 corresponds to the M+1th treatment step.

[0053] When the initial number of buccally inclined posterior teeth 21 is relatively large, by setting the distance d from the top end of the transpalatal arch 12 close to the palate 30 to the corresponding position of the palate 30 to be relatively large, the transpalatal arch 12 can have a larger movement space when moving towards the palate 30, and when the tongue exerts force on the transpalatal arch 12, the transpalatal arch 12 can bend towards the palate 30 to a greater extent, thereby allowing the shell-shaped appliance body 11 to have a larger area of inward retraction, thereby providing the plurality of buccally inclined posterior teeth 20 with lingual force.

[0054] The distance d from the top end of the transpalatal arch 12 close to the palate 30 to the corresponding position of the palate 30 is 3-7 mm. When d is within this range, the transpalatal arch 12 can have sufficient movement space when moving towards the palate 30, thereby providing the shell-shaped appliance body 11 with sufficient arch contraction force, thereby allowing the buccally inclined posterior tooth 21 to generate a treatment force.

[0055] Preferably, the distance d from the top end of the transpalatal arch 12 close to the palate 30 to the corresponding position of the palate 30 is 5-7 mm. This range can allow the transpalatal arch 12 to provide a relatively strong treatment force to the buccally inclined posterior tooth 21 when moving towards the palate 30.

[0056] In the sagittal direction, the transverse palatal arch 12 is located in the posterior tooth region of the shell-shaped orthodontic appliance body 11. In other words, the left fourth tooth (first premolar) and the right fourth tooth (first premolar) are connected to form a first line, and the left eighth tooth (third molar) and the right eighth tooth (third molar) are connected to form a second line; in the sagittal direction, the transverse palatal arch 12 is located between the first line and the second line.

[0057] This ensures that there is sufficient space in the oral cavity to accommodate the transverse palatal arch 12, and ensures that the distance d from the top of the transverse palatal arch 12 on the side closest to the maxilla 30 to its corresponding position on the maxilla 30 is maintained, while also avoiding interference with the normal movement of the tongue.

[0058] See Figures 1 to 2 The transverse palatal arch 12 is strip-shaped. The transverse palatal arch 12 needs to cross the jaw and connect the two posterior teeth 20. By designing the transverse palatal arch 12 to be strip-shaped, on the one hand, the transverse palatal arch 12 can have sufficient strength, and on the other hand, it can save material and reduce costs while accurately applying force.

[0059] See Figure 2 The shape of the transverse palatal arch 12, projected onto the occlusal surface, is a symmetrical figure with the tooth midline L as the axis. This symmetrical figure ensures consistent expansion force direction, which is beneficial for consistent expansion results.

[0060] In one embodiment, the tooth positions corresponding to the tooth receiving cavities connected at both ends of the transverse palatal arch 12 are consistent, so that the applied arch expansion force or arch contraction force is symmetrical.

[0061] The transverse palatal arch 12 is a curved arch, the curvature of which is roughly the same as the contour of the corresponding hard palate. By setting the transverse palatal arch 12 to a curved arch, the transverse palatal arch 12 can be made more elastic, so that a stronger arch-expanding force can be applied.

[0062] The transverse jaw arch 12 and the shell-shaped orthodontic appliance body 11 can be integrally molded or separately molded; the transverse jaw arch 12 and the shell-shaped orthodontic appliance body 11 can be integrally molded by pressure molding or directly 3D printing, or they can be separately connected by snap-fit, adhesive, magnetic attraction or other structures.

[0063] In one embodiment, the connection width between the transverse jaw arch 12 and the shell-shaped orthodontic appliance body 11 is ≥2mm, so that the force exerted by the tongue on the transverse jaw arch 12 can be effectively transmitted to the shell-shaped orthodontic appliance body 11, and the connection strength between the two can be guaranteed.

[0064] In one embodiment, the connecting portion 111 is adjacent to the gingival margin of the tooth receiving cavity to which it is connected, so that when the transpalatal arch 12 applies force, the force transmission position is as close as possible to the root of the tooth, so as to accurately move the tooth and avoid the tooth from cheek tilting due to the force transmission position being too high.

[0065] The transpalatal arch 12 comprises a body 122, and a tongue-acting portion 121 is arranged on the body 122 at a position close to the middle line of the palate 30 and away from the palate 30. The tongue-acting portion 121 protrudes out of the body 122 in the direction of the front teeth. In this way, the side of the tongue-acting portion 121 away from the palate 30 forms at least part of the tongue-acting surface 120, so that a larger acting surface can be provided for the tongue, and the burden on the tongue muscle is reduced.

[0066] In combination Figure 5 In an embodiment, the transpalatal arch 12 comprises a body 122 and at least one bent portion 123 arranged at one end of the body 122 in the direction of the front teeth. The bent portion 123 can prevent the edge of the transpalatal arch 12 from being too sharp to scratch the tongue, and can also strengthen the transpalatal arch 12.

[0067] Preferably, the transpalatal arch 12 comprises two bent portions 123 arranged at one end of the body 122 in the direction of the front teeth and at the other end of the body 122 away from the front teeth, respectively, and the openings formed by the two bent portions 123 and the body 122 face each other. That is, the two bent portions 123 are arranged at the sagittal front and back ends of the body 122 of the transpalatal arch 12, so that the sagittal front and back ends of the transpalatal arch 12 can be protected, and the oral cavity can be prevented from being scratched.

[0068] Preferably, the bent portion 123 is arc-shaped and is folded upward in the sagittal direction from the body 122, so that the bent portion 123 can be prevented from contacting the tongue and scratching the tongue.

[0069] In summary, the beneficial effects of the present application include that after the maxillary dental appliance is worn on the dentition of the upper jaw, the tongue can press the tongue-acting surface 120 of the transpalatal arch 12. At this time, since the transpalatal arch 12 is arranged spaced apart from the palate 30, that is, there is a space between the transpalatal arch 12 and the palate 30, the transpalatal arch 12 can be bent toward the palate 30 under pressure, and the two sides of the transpalatal arch 12 are retracted, so that the posterior tooth area of the shell-shaped appliance body 11 can be retracted to generate a correction force on the buccally inclined posterior teeth 21, so that the buccally inclined posterior teeth 21 can be straightened.

[0070] It should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the specification is described in this way only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0071] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or modifications made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. An upper dental aligner comprising a shell aligner, characterised in that, The shell-shaped appliance comprises: a shell-shaped appliance body having a plurality of tooth receiving cavities; a transverse palatal arch at least partially spanning the dental arch width of the shell-shaped appliance body, two ends of the transverse palatal arch being connected to the lingual side of the posterior tooth area on the left and right sides of the shell-shaped appliance body respectively; when the shell-shaped appliance is worn on the dentition of the upper jaw, the transverse palatal arch is arranged spaced apart from the upper jaw, and the side of the transverse palatal arch facing away from the upper jaw constitutes a lingual action surface.

2. The maxillary dental appliance of claim 1, wherein, The transverse palatal arch is connected to the range of the tooth receiving cavity corresponding to tooth positions 5-7.

3. The maxillary dental aligner of claim 1 or 2, wherein, The shell-shaped appliance body has a connecting portion connected to the transverse palatal arch, and the connecting portion is arranged at the tooth receiving cavity accommodating the buccally inclined posterior teeth.

4. The maxillary dental appliance of claim 1, wherein, The upper jaw tooth corrector comprises N shell-shaped appliances corresponding to N successive correction steps respectively, N≥2; each shell-shaped appliance is used to reposition the target treatment teeth from the initial layout of the corresponding correction step to the target layout of the corresponding correction step. In the N shell-shaped appliances, the distance d from the top end of the side of the transverse palatal arch close to the upper jaw to the corresponding position of the upper jaw is positively correlated with the initial buccal inclination angle of the buccally inclined posterior teeth of the corresponding correction step.

5. The maxillary dental appliance of claim 1, wherein, The upper jaw tooth corrector comprises N shell-shaped appliances corresponding to N successive correction steps respectively, N≥2; each shell-shaped appliance is used to reposition the target treatment teeth from the initial layout of the corresponding correction step to the target layout of the corresponding correction step. In the N shell-shaped appliances, the distance d from the top end of the side of the transverse palatal arch close to the upper jaw to the corresponding position of the upper jaw is positively correlated with the initial number of buccally inclined posterior teeth of the corresponding correction step.

6. The maxillary dental appliance of claim 1, wherein, The distance d from the top end of the side of the transverse palatal arch close to the upper jaw to the corresponding position of the upper jaw is 3-7 mm.

7. The maxillary dental appliance of claim 6, wherein, The distance d is 5-7 mm.

8. The maxillary dental appliance of claim 1, wherein, In the sagittal direction, the transverse palatal arch is located in the posterior tooth area of the shell-shaped appliance body.

9. The maxillary dental appliance of claim 1, wherein, The transverse palatal arch is in the shape of a strip.

10. The maxillary dental appliance of claim 1, wherein, The connection width of the transverse palatal arch and the shell-shaped appliance body is ≥2 mm.

11. The maxillary dental appliance of claim 1, wherein, The transverse palatal arch comprises a body, and a lingual action portion is arranged on the side of the body away from the upper jaw close to the position of the midline of the upper jaw, and the lingual action portion protrudes out of the body in the direction of the anterior teeth.

12. The maxillary dental appliance of claim 1, wherein, The transverse palatal arch comprises a body and at least one bending portion, and at least one bending portion is arranged at one end of the body facing the anterior teeth.

13. The maxillary dental appliance of claim 12, wherein, The transverse palatal arch comprises two bending portions, and the two bending portions are arranged at one end of the body facing the anterior teeth and one end of the body facing away from the anterior teeth respectively, and the openings formed by the two bending portions and the body face each other.

14. The maxillary dental appliance of claim 12, wherein, The bending portion is in the shape of an arc and is folded upward in the sagittal direction from the body.

15. The maxillary dental appliance of claim 1, wherein, The transverse palatal arch is in the shape of a curved arch, and the curved shape is substantially the same as the corresponding contour of the upper jaw.

16. The maxillary dental appliance of claim 1, wherein, The transverse palatal arch and the shell-shaped appliance body are in an integral molding structure or a split molding structure.

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