Orthodontic appliance design method and system based on biomechanics and orthodontic appliance

Abstract

The invention discloses an orthodontic appliance design method and system based on biomechanics and an orthodontic appliance, and relates to the technical field of orthodontics, the method comprises the following steps: obtaining oral cavity information of a target object, and constructing an initial dental digital model according to the oral cavity information; determining a target dental digital model for optimizing an occlusion relationship according to the initial dental digital model, and generating an orthodontic appliance model according to the target dental digital model; respectively calculating the movement track of each tooth according to the initial dental digital model and the target dental digital model; and correcting the orthodontic appliance model according to the movement track so as to form extruding parts and avoiding parts which are alternately arranged in a tooth socket of the orthodontic appliance model. According to the invention, the teeth can be naturally aligned, the risk of tooth root absorption or alveolar bone injury is reduced, and the orthodontic effect on the teeth is ensured.

Description

Technical Field

[0001] This invention relates to the field of orthodontic technology, and in particular to a biomechanical-based orthodontic appliance design method, system, and appliance. Background Technology

[0002] Braces are used to correct malocclusion by applying specific pressure to specific areas of the teeth to move them into the correct position. With the development of liquid silicone 3D printing technology, custom-made braces based on the patient's dental contours have begun to appear. These braces are highly targeted, comfortable to wear, and have driven the development of orthodontic technology. Existing silicone braces are formed using liquid silicone 3D printing. By manually adjusting the position of the corresponding brace socket, the patient's teeth exert pressure against the inner wall of the socket, causing the brace to elastically deform. This deformation of the brace generates continuous pressure on the teeth, thereby moving them into the correct position.

[0003] However, existing silicone braces only consider the optimized bite relationship and jaw structure, which can easily lead to uneven pressure distribution during wear, resulting in uneven alveolar bone resorption, increasing the risk of root resorption, and affecting the orthodontic effect. At the same time, existing silicone braces have the same wall thickness and do not take into account individual differences, resulting in low treatment efficiency, high risk of periodontal tissue damage, and poor wearing comfort. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a biomechanical design method, system and orthodontic appliance that can naturally align teeth, reduce the risk of root resorption or alveolar bone damage, and ensure the orthodontic effect.

[0005] To address the aforementioned technical problems, this invention provides a biomechanical-based orthodontic appliance design method, comprising: acquiring oral information of a target subject and constructing an initial digital model of the dentition based on the oral information; determining a target digital model of the dentition based on the initial digital model of the dentition, and generating an orthodontic appliance model based on the target digital model of the dentition; calculating the movement trajectory of each tooth based on the initial digital model of the dentition and the target digital model of the dentition; and correcting the orthodontic appliance model based on the movement trajectory, so as to optimize the occlusal relationship of the orthodontic appliance model. Alternating compression and clearance portions are formed in the tooth groove. The tooth groove has an outer edge and an inner edge. The inner wall surface of the outer edge has a plurality of spaced-apart convex surfaces. A transition surface is formed between any two adjacent convex surfaces. The plurality of convex surfaces and the plurality of transition surfaces are connected to form a wave shape. The compression portion is formed between the convex surface and the inner edge. The compression portion is used to compress the tooth. The clearance portion is formed between the transition surface and the inner edge. The clearance portion is used to disperse the stress on the tooth. The width of the compression portion is smaller than the width of the clearance portion.

[0006] As an improvement to the above scheme, the biomechanical-based orthodontic appliance design method further includes: constructing a three-dimensional periodontal ligament finite element model based on the oral information; calculating the movement distance of each tooth based on the initial and target digital dentition models; obtaining the maximum principal stress of each periodontal ligament during tooth movement based on the three-dimensional periodontal ligament finite element model; obtaining the material information of the orthodontic appliance; dividing the orthodontic appliance model into multiple treatment areas corresponding to each tooth; calculating the wall thickness increment information of each treatment area based on the movement distance, maximum principal stress, material information, and a preset periodontal ligament safety stress threshold; and optimizing the orthodontic appliance model based on the wall thickness increment information.

[0007] As an improvement to the above scheme, before optimizing the orthodontic appliance model based on the wall thickness increment information, the method further includes: calculating the sum of the wall thickness increment information and the baseline wall thickness information to generate target wall thickness information; comparing the target wall thickness information with a preset wall thickness threshold; optimizing the orthodontic appliance model based on the target wall thickness information when the target wall thickness information is within the wall thickness threshold range; and optimizing the orthodontic appliance model based on the wall thickness threshold when the target wall thickness information is outside the wall thickness threshold range.

[0008] As an improvement to the above solution, the material information includes the elastic modulus and nonlinear index, and the calculation method for the wall thickness increment information of the correction area includes: according to the formula Calculate the wall thickness increment information of the treatment area; among which, For wall thickness increment information, For the distance traveled, For elastic modulus, It is a non-linear exponent. For the maximum principal stress, This is the safe stress threshold for the periodontal ligament.

[0009] As an improvement to the above scheme, the step of calculating the wall thickness increment information of each orthodontic region based on the movement distance, maximum principal stress, material information, and preset periodontal ligament safety stress threshold includes: dividing the orthodontic region into a crown orthodontic region and a root orthodontic region; calculating the wall thickness increment information of each crown orthodontic region based on the movement distance, maximum principal stress, material information, and preset periodontal ligament safety stress threshold; and calculating the wall thickness increment information of each root orthodontic region based on the movement distance, maximum principal stress, material information, and preset periodontal ligament safety stress threshold.

[0010] As an improvement to the above scheme, the wall thickness threshold of the crown treatment area is 0.5~0.6mm, and the wall thickness threshold of the root treatment area is 0.6~8mm.

[0011] As an improvement to the above scheme, the wall thickness increment information of adjacent orthodontic areas transitions evenly, and / or the wall thickness increment information of the crown orthodontic area and the root orthodontic area in the same orthodontic area transitions evenly.

[0012] Accordingly, the present invention also provides a biomechanical-based orthodontic appliance design system, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the above-described biomechanical-based orthodontic appliance design method.

[0013] Accordingly, the present invention also provides an orthodontic appliance designed using the above-described biomechanical-based orthodontic appliance design method. The orthodontic appliance has alveoli located on its upper and / or lower sides. Each alveoli has alternating compression and clearance portions, the width of which is less than the width of the clearance portion. Each alveoli has an outer edge and an inner edge. The inner wall of the outer edge has multiple spaced-apart convex surfaces, with a transition surface formed between any two adjacent convex surfaces. The multiple convex surfaces and the transition surfaces connect to form a wave shape. The compression portion is formed between the convex surface and the inner edge, and is used to compress the teeth. The clearance portion is formed between the transition surface and the inner edge, and is used to distribute the stress on the teeth.

[0014] As an improvement to the above solution, the orthodontic appliance is printed into an integral structure using a liquid silicone 3D printing thermosetting molding equipment.

[0015] Implementing this invention has the following beneficial effects: This invention creates alternating compression and clearance portions within the alveolar bone, with the width of the compression portions being smaller than the width of the clearance portions. This results in a narrow-wide periodic arrangement of alveolar bone structure in the orthodontic appliance. During orthodontic treatment, the narrow compression portions compress the teeth, increasing the restraint force, while the wide clearance portions do not compress the teeth, dispersing the stress and allowing the teeth to align naturally. Simultaneously, it disperses the local impact of the orthodontic force, reducing the risk of root resorption or alveolar bone damage and ensuring the orthodontic appliance's effectiveness.

[0016] Furthermore, by specifically adjusting the wall thickness information of different regions, the present invention achieves a periodic gradual change in wall thickness from thick to thin to thick. By using the thick wall surface to compress the teeth and the thin wall surface to adapt to tooth movement, the teeth can be naturally aligned, ensuring the orthodontic effect of the appliance. Attached Figure Description

[0017] Figure 1 This is a flowchart of the first embodiment of the biomechanical-based orthodontic appliance design method of the present invention; Figure 2 This is a flowchart of the second embodiment of the biomechanical-based orthodontic appliance design method of the present invention; Figure 3 This is a flowchart of the third embodiment of the biomechanical-based orthodontic appliance design method of the present invention; Figure 4 This is a flowchart of the fourth embodiment of the biomechanical-based orthodontic appliance design method of the present invention; Figure 5 This is a schematic diagram of an embodiment of the orthodontic appliance of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0019] See Figure 1 , Figure 1 The flowchart of the first embodiment of the biomechanical-based orthodontic appliance design method of the present invention is shown, which includes: S101, Obtain the oral cavity information of the target object and construct an initial digital model of the jaw based on the oral cavity information; S102, Determine the target occlusal digital model for optimizing the bite relationship based on the initial occlusal digital model, and generate an orthodontic appliance model based on the target occlusal digital model; S103, calculate the movement trajectory of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S104, the orthodontic appliance model is modified according to the movement trajectory to form alternating compression and avoidance parts in the alveoli of the orthodontic appliance model.

[0020] like Figure 5 As shown, the width of the squeezing part A is smaller than the width of the relief part B. The squeezing part A is used to squeeze the teeth, and the relief part B is used to disperse the stress on the teeth.

[0021] In practical applications, users can bite down on the upper and lower alveoli of the orthodontic appliance to correct the teeth being treated. By forming alternating compression portions A and relief portions B in the alveolar ridge 1, and making the width of compression portion A smaller than the width of relief portion B, the alveolar ridge 1 of the orthodontic appliance exhibits a narrow-wide periodic arrangement of alveolar ridges. During orthodontic treatment, the narrow compression portion A can be used to compress the teeth, increasing the restraint force on the teeth, while the wide relief portion B does not compress the teeth, distributing the stress on the teeth. This allows the teeth to align naturally, while also dispersing the local impact of the orthodontic force on the teeth, reducing the risk of root resorption or alveolar bone damage, and ensuring the orthodontic appliance's effectiveness in correcting the teeth.

[0022] like Figure 5 As shown, the tooth groove 1 has an outer edge 11 and an inner edge 12. The inner wall surface of the outer edge 11 has a plurality of spaced-apart inner convex surfaces 111, and a transition surface 112 is formed between any two adjacent inner convex surfaces 11. A compression part A is formed between the inner convex surface 111 and the inner edge 12, and a clearance part B is formed between the transition surface 112 and the inner edge 12. Thus, the inner convex surface 111 and the transition surface 112 can be used to make the inner wall surface of the outer edge 11 form a curved wall surface, and the teeth are compressed by the inner convex surface 11 protruding towards the tooth groove, thereby completing the orthodontic treatment of the teeth and ensuring the alignment of the teeth.

[0023] It should be noted that the height and angle of the inner convex surface 111 can be determined according to the movement trajectory of the tooth to be treated. For example, if the movement distance between the initial position and the target position of the tooth to be treated is 1 mm, and the movement direction is translation towards the inner edge, then the height of the inner convex surface 111 is 1 mm, and the direction of the inner convexity is towards the inner edge.

[0024] like Figure 5 As shown, multiple inner convex surfaces 111 and multiple transition surfaces 112 are connected to form a wave shape. While using the inner convex surfaces 111 to squeeze and correct the teeth, it ensures a smooth transition between the inner convex surfaces 111 and the transition surfaces 112, avoiding sharp connection structures such as right angles or sharp protrusions on the inner wall of the outer edge 11, which could cause sharp stimulation to the patient's teeth and ensure the user's wearing comfort when using the orthodontic appliance.

[0025] Therefore, in this embodiment, by designing alternating compression sections A and clearance sections B in the alveolar bone 1 of the orthodontic appliance model, the narrow compression section A can compress the teeth to enhance the restraint force on the teeth, while the wide clearance section B does not compress the teeth, thus dispersing the stress on the teeth. This allows the teeth to align naturally, while also dispersing the local impact of the orthodontic force on the teeth, reducing the risk of root resorption or alveolar bone damage, and ensuring the orthodontic appliance's orthodontic effect on the teeth.

[0026] See Figure 2 , Figure 2 The flowchart of a second embodiment of the biomechanical-based orthodontic appliance design method of the present invention is shown, which includes: S201, Obtain the oral cavity information of the target object and construct an initial digital model of the jaw based on the oral cavity information; S202, determine the target occlusal digital model for optimizing the bite relationship based on the initial occlusal digital model, and generate an orthodontic appliance model based on the target occlusal digital model; S203, calculate the movement trajectory of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S204, The orthodontic appliance model is modified according to the movement trajectory to form alternating squeezing and clearance parts in the alveolar space of the orthodontic appliance model. S205, Construct a three-dimensional finite element model of the periodontal ligament based on oral cavity information; In practical applications, oral cavity information can be acquired through cone-beam computed tomography (CBCT) to construct a three-dimensional finite element model of the periodontal ligament based on the oral cavity information.

[0027] S206, Calculate the movement distance of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S207, the maximum principal stress of each periodontal ligament during tooth movement is obtained based on the three-dimensional periodontal ligament finite element model; S208, Obtain material information for orthodontic appliances; It should be noted that material information can be stored in a material parameter library, which includes elastic modulus and nonlinear index, but is not a limitation thereof.

[0028] S209 divides the orthodontic appliance model into multiple treatment areas that correspond one-to-one with the teeth. In other words, each tooth corresponds to a specific treatment area to achieve targeted adjustment of the teeth.

[0029] S210 calculates the wall thickness increment information of each orthodontic area based on the movement distance, maximum principal stress, material information and preset periodontal ligament safety stress threshold. It should be noted that the wall thickness increment information refers to the wall thickness increment information of the outer edge 11 and / or inner edge 12 of the tooth under compression.

[0030] Accordingly, the wall thickness increment information of the treatment area can be calculated according to the following formula:

[0031] in: This is information on wall thickness increments; The distance traveled; It is the elastic modulus; It is a non-linear exponent, where, The preferred value is 0.3 to 0.7; This is the maximum principal stress; This is the safe stress threshold for the periodontal ligament.

[0032] For example, when the moving distance is 0, the wall thickness increment information is 0, that is, the preset baseline wall thickness information can be maintained.

[0033] S211, optimize the orthodontic appliance model based on the wall thickness increment information.

[0034] During the optimization process, the wall thickness increment information of adjacent orthodontic areas is uniformly transitioned, thereby effectively avoiding excessive stress concentration.

[0035] Finally, the orthodontic appliance model can be optimized based on the wall thickness increment information, and an STL file can be generated for subsequent 3D printing.

[0036] Therefore, by designing different wall thickness increments, the wall thickness can be made to change in a periodic gradient of thick-thin-thick. By using the thick wall surface to compress the teeth and the thin wall surface to adapt to the movement of the teeth, the teeth can be naturally aligned, ensuring the orthodontic effect of the appliance.

[0037] See Figure 3 , Figure 3 The flowchart of the third embodiment of the biomechanical-based orthodontic appliance design method of the present invention is shown, which includes: S301, Obtain the oral cavity information of the target object and construct an initial digital model of the jaw based on the oral cavity information; S302, determine the target occlusal digital model for optimizing the bite relationship based on the initial occlusal digital model, and generate an orthodontic appliance model based on the target occlusal digital model; S303, calculate the movement trajectory of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S304, The orthodontic appliance model is modified according to the movement trajectory to form alternating compression and avoidance parts in the alveolar space of the orthodontic appliance model. S305, Construct a three-dimensional finite element model of the periodontal ligament based on oral cavity information; S306, calculate the movement distance of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S307, the maximum principal stress of each periodontal ligament during tooth movement is obtained based on the three-dimensional periodontal ligament finite element model; S308, Obtain material information for orthodontic appliances; S309 divides the orthodontic appliance model into multiple treatment areas that correspond one-to-one with the teeth. S310 calculates the wall thickness increment information of each orthodontic area based on the movement distance, maximum principal stress, material information and preset periodontal ligament safety stress threshold. S311, Calculate the sum of the wall thickness increment information and the reference wall thickness information to generate the target wall thickness information; S312, compare the target wall thickness information with the preset wall thickness threshold; S313, When the target wall thickness information is within the wall thickness threshold range, optimize the orthodontic appliance model based on the target wall thickness information; S314, when the target wall thickness information is outside the wall thickness threshold range, optimize the orthodontic appliance model according to the wall thickness threshold.

[0038] It should be noted that the wall thickness threshold is 0.5~8mm.

[0039] For example, when the target wall thickness information is 8.1 mm, the maximum value of 8 mm in the wall thickness threshold can be used to optimize the orthodontic appliance model; For example, when the target wall thickness information is 0.1mm, the minimum value of 0.5mm in the wall thickness threshold can be used to optimize the orthodontic appliance model; For example, when the target wall thickness information is 0.7mm, the orthodontic appliance model can be optimized using the target wall thickness information of 0.7mm.

[0040] and Figure 2 The second embodiment shown differs in that it introduces a wall thickness threshold to avoid excessive deformation of the orthodontic appliance model due to excessive wall thickness, thereby further ensuring the patient's wearing comfort.

[0041] See Figure 4 , Figure 4The flowchart of the fourth embodiment of the biomechanical-based orthodontic appliance design method of the present invention is shown, which includes: S401, Obtain the oral cavity information of the target object and construct an initial digital model of the jaw based on the oral cavity information; S402, determine the target occlusal digital model for optimizing the bite relationship based on the initial occlusal digital model, and generate an orthodontic appliance model based on the target occlusal digital model; S403, calculate the movement trajectory of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S404, the orthodontic appliance model is modified according to the movement trajectory to form alternating squeezing and clearance parts in the alveolar space of the orthodontic appliance model; S405, Construct a three-dimensional finite element model of the periodontal ligament based on oral cavity information; S406, calculate the movement distance of each tooth based on the initial digital model of the jaw and the target digital model of the jaw respectively; S407, the maximum principal stress of each periodontal ligament during tooth movement is obtained based on the three-dimensional periodontal ligament finite element model; S408, Obtain material information for orthodontic appliances; S409 divides the orthodontic appliance model into multiple treatment areas that correspond one-to-one with the teeth. S410 divides the orthodontic area into the crown orthodontic area and the root orthodontic area; and Figure 3 The third embodiment shown differs in that it further divides the treatment area into a crown treatment area and a root treatment area to provide targeted treatment for the crown and root.

[0042] S411, calculate the wall thickness increment information of each crown treatment area based on the crown movement distance, maximum principal stress, material information and preset periodontal ligament safety stress threshold; S412 calculates the wall thickness increment information of each root treatment area based on the root movement distance, maximum principal stress, material information, and preset periodontal ligament safety stress threshold.

[0043] S413, calculate the sum of the wall thickness increment information and the reference wall thickness information to generate the target wall thickness information; S414, compare the target wall thickness information with the preset wall thickness threshold; It should be noted that the wall thickness threshold for the crown treatment area is 0.5~0.6mm, and the wall thickness threshold for the root treatment area is 0.6~8mm, so that the root treatment area can bear more stress and better meet the actual needs.

[0044] S415, When the target wall thickness information is within the wall thickness threshold range, optimize the orthodontic appliance model based on the target wall thickness information; S416, when the target wall thickness information is outside the wall thickness threshold range, the orthodontic appliance model is optimized according to the wall thickness threshold.

[0045] During the optimization process, the wall thickness increment information of the crown treatment area and the wall thickness increment information of the root treatment area in the same treatment area transitioned evenly.

[0046] Therefore, this embodiment uses the wall thickness in different areas of the tooth (crown and root) as a variable to form an orthodontic appliance model with non-uniform wall thickness, so as to achieve targeted treatment in different areas of the tooth, thereby greatly improving the treatment effect.

[0047] Accordingly, the present invention also discloses a biomechanical orthodontic appliance design system, including a memory and a processor. The memory stores a computer program, wherein the processor executes the computer program to implement the steps of the above-mentioned biomechanical orthodontic appliance design method.

[0048] See Figure 5 , Figure 5 The specific structure of the orthodontic appliance of the present invention is shown. It is designed using the above-mentioned biomechanical-based orthodontic appliance design method. Specifically: the orthodontic appliance has a tooth socket 1, which is located on the upper and / or lower side of the orthodontic appliance; the tooth socket 1 has alternating compression portions A and relief portions B, the width of the compression portion A is smaller than the width of the relief portion B; the tooth socket 1 has an outer edge 11 and an inner edge 12, the inner wall surface of the outer edge 11 has a plurality of spaced-apart inward convex surfaces 111, a transition surface 112 is formed between any two adjacent inward convex surfaces 111, and the plurality of inward convex surfaces 111 and the plurality of transition surfaces 112 are connected to form a wave shape; the compression portion A is formed between the inward convex surface 111 and the inner edge 12, and the compression portion A is used to compress the teeth; the relief portion B is formed between the transition surface 112 and the inner edge 12, and the relief portion B is used to disperse the stress on the teeth.

[0049] In practical applications, users can bite down on the upper and lower alveoli of the orthodontic appliance to correct the teeth being treated. By forming alternating compression portions A and relief portions B in the alveolar ridge 1, and making the width of compression portion A smaller than the width of relief portion B, the alveolar ridge 1 of the orthodontic appliance exhibits a narrow-wide periodic arrangement of alveolar ridges. During orthodontic treatment, the narrow compression portion A can be used to compress the teeth, increasing the restraint force on the teeth, while the wide relief portion B does not compress the teeth, distributing the stress on the teeth. This allows the teeth to align naturally, while also dispersing the local impact of the orthodontic force on the teeth, reducing the risk of root resorption or alveolar bone damage, and ensuring the orthodontic appliance's effectiveness in correcting the teeth.

[0050] Correspondingly, through the above-mentioned biomechanical-based orthodontic appliance design method, the wall thickness information of different areas can be further adjusted, so that the wall thickness has a periodic gradual change of thick-thin-thick. By using the thick wall surface to compress the teeth and the thin wall surface to adapt to the movement of the teeth, the teeth can be naturally aligned, ensuring the orthodontic effect of the appliance.

[0051] Even better, the orthodontic appliance is printed into a single structure using a liquid silicone 3D printing thermosetting molding device. This effectively improves the adaptability of the orthodontic appliance while ensuring its biocompatibility and enhancing patient comfort.

[0052] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A biomechanically based orthodontic appliance design method, characterized by, The method comprises the following steps: obtaining oral information of a target object, and constructing an initial dental arch digital model according to the oral information; determining a target dental arch digital model of an optimized occlusion relationship according to the initial dental arch digital model, and generating an orthodontic appliance model according to the target dental arch digital model; calculating the movement trajectory of each tooth according to the initial dental arch digital model and the target dental arch digital model, respectively; correcting the orthodontic appliance model according to the movement trajectory to form an extrusion part and a avoiding part arranged alternately in the tooth socket of the orthodontic appliance model, wherein the tooth socket is formed with an outer edge and an inner edge, the inner wall surface of the outer edge is formed with a plurality of spaced-apart inner convex surfaces, a transition surface is formed between any two adjacent inner convex surfaces, and the plurality of inner convex surfaces and the plurality of transition surfaces are connected to form a wave shape, the extrusion part is formed between the inner convex surface and the inner edge, and is used for extruding the tooth, the avoiding part is formed between the transition surface and the inner edge, and is used for dispersing the stress on the tooth, and the width of the extrusion part is smaller than the width of the avoiding part.

2. The biomechanically based orthodontic appliance design method of claim 1, wherein, The method further comprises the following steps: constructing a three-dimensional periodontal membrane finite element model according to the oral information; calculating the movement distance of each tooth according to the initial dental arch digital model and the target dental arch digital model, respectively; obtaining the maximum principal stress of each periodontal membrane in the tooth movement process according to the three-dimensional periodontal membrane finite element model; obtaining the material information of the orthodontic appliance; dividing the orthodontic appliance model into a plurality of orthodontic regions corresponding to the teeth one by one; calculating the wall thickness increment information of each orthodontic region according to the movement distance, the maximum principal stress, the material information and a preset periodontal membrane safety stress threshold value, respectively; optimizing the orthodontic appliance model according to the wall thickness increment information.

3. The biomechanically based orthodontic appliance design method of claim 2, wherein, Before optimizing the orthodontic appliance model according to the wall thickness increment information, the method further comprises the following steps: calculating the sum of the wall thickness increment information and a reference wall thickness information to generate target wall thickness information; comparing the target wall thickness information with a preset wall thickness threshold value; when the target wall thickness information is within the wall thickness threshold value range, optimizing the orthodontic appliance model according to the target wall thickness information; when the target wall thickness information is outside the wall thickness threshold value range, optimizing the orthodontic appliance model according to the wall thickness threshold value.

4. The biomechanically based orthodontic appliance design method of claim 2 or 3, wherein, The material information includes the elastic modulus and the nonlinear index, and the calculation method of the wall thickness increment information of the orthodontic region comprises the following steps: According to the formula , the wall thickness increment information of the correction area is calculated; wherein, is wall thickness increment information, is a movement distance, is an elastic modulus, is a nonlinearity index, is a maximum principal stress, is a periodontal ligament safety stress threshold.

5. The biomechanically based orthodontic appliance design method of claim 2 or 3, wherein, the step of calculating the wall thickness increment information of each orthodontic region according to the movement distance, the maximum principal stress, the material information and a preset periodontal membrane safety stress threshold value, respectively, comprises the following steps: dividing the orthodontic region into a tooth crown orthodontic region and a tooth root orthodontic region; calculating the wall thickness increment information of each tooth crown orthodontic region according to the movement distance, the maximum principal stress, the material information and a preset periodontal membrane safety stress threshold value, respectively; calculating the wall thickness increment information of each tooth root orthodontic region according to the movement distance, the maximum principal stress, the material information and a preset periodontal membrane safety stress threshold value, respectively.

6. The biomechanically based orthodontic appliance design method of claim 5, wherein, The wall thickness threshold value of the tooth crown orthodontic region is 0.5-0.6 mm, and the wall thickness threshold value of the tooth root orthodontic region is 0.6-8 mm.

7. The biomechanically based orthodontic appliance design method of claim 5, wherein, The wall thickness increment information of adjacent treatment areas is uniformly transitioned, and / or the wall thickness increment information of the crown treatment area and the wall thickness increment information of the root treatment area in the same treatment area are uniformly transitioned.

8. A biomechanically-based orthodontic appliance design system comprising a memory and a processor, the memory storing a computer program, wherein, The processor implements the steps of the biologically mechanical orthodontic appliance design method of any one of claims 1-7 when executing the computer program.

9. An orthodontic appliance designed using the biomechanically-based orthodontic appliance design method of any one of claims 1-7, wherein, The orthodontic appliance is formed with tooth grooves on the upper side and / or the lower side of the orthodontic appliance. The tooth grooves are formed with alternately arranged extrusion portions and avoidance portions, and the width of the extrusion portion is smaller than the width of the avoidance portion. The tooth grooves are formed with an outer edge and an inner edge, the inner wall surface of the outer edge is formed with a plurality of spaced-apart inner convex surfaces, a transition surface is formed between any two adjacent inner convex surfaces, and a plurality of inner convex surfaces and a plurality of transition surfaces are connected to form a wave shape. The extrusion portion is formed between the inner convex surface and the inner edge, and is used for extruding the teeth; and the avoidance portion is formed between the transition surface and the inner edge, and is used for dispersing the stress on the teeth.

10. The orthodontic appliance of claim 9, wherein, The orthodontic appliance is integrally formed by a liquid silicone 3D printing and thermal curing molding equipment.

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