Method for generating accessory regimen for orthodontic treatment of teeth with shell-shaped orthodontic appliance

Abstract

One aspect of the present application provides a computer-implemented method for generating an accessory regime for orthodontic treatment with a shell-shaped orthodontic appliance, the method comprises the following steps: according to each correction force required by each tooth of a dentition of a patient to achieve a correction target and a threshold value of each correction force which can be applied to each tooth by a shell-shaped tooth correction device under the condition of no accessory, determining the correction force required to be enhanced by each tooth, on the basis, the teeth needing to be added with the accessories and the types of the accessories needing to be added are determined, and the types of the accessories comprise the shapes of the accessories; establishing an installation feasible region for each accessory, wherein each installation feasible region comprises a region, allowing the installation of the corresponding accessory, of the surface of the corresponding tooth; the optimal solutions of the poses and the sizes of all the accessories are obtained through calculation based on the feasible regions by means of an objective function, and the corresponding correction force needing to be enhanced and provided by the optimal solutions of the poses and the sizes of all the accessories is larger than or equal to the corresponding correction force needed by the corresponding teeth.

Description

Technical Field

[0001] The present application generally relates to a computer-implemented method of generating attachment plans for orthodontic treatment utilizing shell-shaped dental appliances. Background Art

[0002] Shell-shaped dental appliances based on polymer materials are becoming increasingly popular due to their aesthetic, convenience and ease of cleaning.

[0003] The shell-shaped dental appliance is a one-piece shell that forms a cavity to accommodate multiple teeth. Usually, the geometry of the cavity substantially matches the teeth in the corresponding arrangement. Orthodontic treatment using shell-shaped dental appliances generally requires dozens of successive shell-shaped dental appliances, and by wearing these shell-shaped dental appliances successively, the patient's teeth are gradually repositioned from the initial tooth arrangement to the target tooth arrangement.

[0004] Shell-shaped dental appliances use the rebound force generated by deformation to reposition the patient's teeth from the current tooth layout to the predetermined tooth layout. A single shell-shaped dental appliance has limited effects in some aspects of movement, such as axis alignment, rotation, torque, and root control. Therefore, in some cases, it is necessary to bond accessories to the tooth surface and utilize the interaction between the shell-shaped dental appliance and the accessories to enhance the ability of the shell-shaped dental appliance to reposition the teeth.

[0005] The existing method for determining the type and location of attachments is to first determine whether each tooth needs to have an attachment added based on manually sorted rules, and then determine the location to add the attachment using a grid search method based on pre-defined rules.

[0006] However, teeth have various shapes and movements, and different materials of shell-shaped dental appliances have different mechanical properties, so it is difficult to list all cases through rules. Furthermore, existing methods cannot pre-calculate the force required for each tooth and the force that each attachment can provide. Therefore, the attachment posture and shape determined by them lack personalized design for specific cases. Moreover, existing methods only determine the posture and shape of the attachment based on the initial and target positions of the teeth, and cannot be personalized according to a specific step-by-step plan.

[0007] In view of the above problems with the existing methods for determining the type and position of attachments, it is necessary to provide a new method for generating attachment plans for orthodontic treatment using shell-shaped dental appliances. Summary of the invention

[0008] One aspect of the present application provides a computer-implemented method for generating an accessory plan for orthodontic treatment using a shell-shaped dental appliance, comprising: determining the corrective force that needs to be enhanced for each tooth based on the respective corrective forces required for achieving the correction goal - each tooth of the patient's dentition and the threshold values ​​of the respective corrective forces that the shell-shaped dental appliance can apply to each tooth without accessories, and based on this, determining the teeth to which accessories need to be added and the types of accessories to be added, wherein the types of accessories include the shapes of the accessories; establishing an installation feasible domain for each accessory, each installation feasible domain including an area on the surface of a corresponding tooth where the corresponding accessory is allowed to be installed; and using an objective function to calculate the optimal solution for the posture and size of each accessory based on the feasible domain, wherein the corresponding corrective force that can be provided by the optimal solution for the posture and size of each accessory is greater than or equal to the corresponding corrective force required for the corresponding tooth.

[0009] In some embodiments, the optimal solution for the position and size of each of the attachments can provide the maximum corresponding correction force to be enhanced.

[0010] In some embodiments, the corrective force is one of: a force along the x-axis of the local tooth coordinate system, a force along the y-axis of the local tooth coordinate system, a force along the z-axis of the local tooth coordinate system, a moment around the x-axis of the local tooth coordinate system, a moment around the y-axis of the local tooth coordinate system, and a moment around the z-axis of the local tooth coordinate system.

[0011] In some embodiments, the computer-implemented method for generating an accessory plan for orthodontic treatment using a shell-shaped dental appliance also includes: calculating the various correction forces required for each tooth of the dentition to achieve the correction target based on the initial tooth layout and the target tooth layout of the dentition.

[0012] In some embodiments, each correction force required to achieve the correction target for each tooth of the dentition is calculated based on a three-dimensional digital model representing an initial tooth layout and a target tooth layout of the dentition.

[0013] In some embodiments, each correction force required to achieve the correction target for each tooth of the dentition is predicted using a trained deep neural network based on a three-dimensional digital model representing an initial tooth layout and a target tooth layout of the dentition.

[0014] In some embodiments, the training data set used to train the deep neural network is obtained by simulation based on a large number of cases using a mechanical analysis tool.

[0015] In some embodiments, the computer-implemented method for generating an attachment plan for orthodontic treatment using a shell-like dental appliance also includes: determining the threshold value of each correction force that the shell-like dental appliance can apply to each tooth without attachments based on material information of the shell-like dental appliance, wherein the material information includes the type and thickness of the material.

[0016] In some embodiments, the threshold values ​​of the correction forces that the shell-shaped dental appliance can apply to each tooth without accessories are determined based on the material information and statistical results of the shell-shaped dental appliance, and the statistical results are obtained by statistically analyzing the data obtained by simulating a large number of cases using mechanical analysis tools.

[0017] In some embodiments, the installation feasible domain of an attachment is created based on the following two constraints: the attachment is located on the labial / buccal surface of the corresponding tooth; and the distance between the attachment and the gum line is greater than a predetermined distance.

[0018] In some embodiments, the installation feasible domain of the attachment is also created based on the following constraint condition: the attachment of minimum size has no collision with the adjacent teeth in the jaw and the adjacent teeth in the opposing jaw.

[0019] In some embodiments, for an accessory, the optimal solution of the objective function satisfies the following two conditions: in all correction steps, the accessory has no collision with the adjacent teeth in the jaw and the adjacent teeth in the opposing jaw; and the posture of the accessory belongs to the installation feasible domain.

[0020] In some embodiments, in the process of solving the objective function for an accessory, the ratio of the length, width, and height of the accessory is variable.

[0021] Another aspect of the present application provides a computer execution system for generating accessory solutions for orthodontic treatment using a shell-shaped dental appliance, comprising: a processor; and a storage device, wherein the storage device stores a computer program for generating accessory solutions for orthodontic treatment using a shell-shaped dental appliance, and when the computer program is run, the processor will execute the method for generating accessory solutions for orthodontic treatment using a shell-shaped dental appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other features of the present application will be further described below in conjunction with the accompanying drawings and detailed descriptions thereof. It should be understood that these drawings only illustrate several exemplary embodiments according to the present application and should not be considered as limiting the scope of protection of the present application. Unless otherwise specified, the drawings are not necessarily to scale and similar reference numerals represent similar components.

[0023] Figure 1A schematic flowchart of a method for generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance executed by a computer in one embodiment of the present application; and Figure 2 An interface of a computer program for generating attachment plans for orthodontic treatment using a shell-shaped dental appliance in one embodiment of the present application shows an attachment plan generated for tooth No. 11 in an example using the method of the present application. DETAILED DESCRIPTION

[0024] The following detailed description refers to the drawings that form part of this specification. The illustrative embodiments mentioned in the specification and drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present application. Under the guidance of the present application, those skilled in the art will understand that many other embodiments can be adopted and various changes can be made to the described embodiments without departing from the subject matter and scope of protection of the present application. It should be understood that the various aspects of the present application described and illustrated herein can be arranged, replaced, combined, separated and designed according to many different configurations, and these different configurations are within the scope of protection of the present application.

[0025] One aspect of the present application provides a computer-implemented method for generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance. The method determines the teeth to which attachments need to be added and the types of attachments required based on the correction force required for each tooth and the maximum correction force that the shell-shaped dental appliance can apply, then establishes an installation feasible domain for the teeth to which attachments need to be added, and finally, uses an objective function to calculate the optimal solution for the position and size of each attachment based on the feasible domain.

[0026] Another aspect of the present application provides a computer system for generating accessory solutions for orthodontic treatment using a shell-shaped dental appliance, which includes a processor and a storage device, wherein the storage device stores a computer program for generating accessory solutions for orthodontic treatment using a shell-shaped dental appliance, and when it is run, the processor will execute the method for generating accessory solutions for orthodontic treatment using a shell-shaped dental appliance.

[0027] Please refer to Figure 1 , which is a schematic flowchart of a method 100 executed by a computer for generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance in one embodiment of the present application.

[0028] In 101, the correction force required for each tooth to achieve the correction target is calculated based on the orthodontic treatment plan.

[0029] In one embodiment, a dental orthodontic treatment plan using a shell-shaped dental appliance may include a digital data set representing multiple successive tooth layouts from an initial tooth layout to a target tooth layout, for example, a three-dimensional digital model representing multiple successive tooth layouts from an initial tooth layout to a target tooth layout, or a digital data set representing the posture (position and angle) of each tooth under multiple successive tooth layouts from an initial tooth layout to a target tooth layout.

[0030] The initial tooth configuration is the tooth configuration of the patient before orthodontic treatment, the target tooth configuration is the tooth configuration that the orthodontic treatment hopes to achieve, and the multiple successive intermediate tooth configurations between the initial tooth configuration and the target tooth configuration are the tooth configurations that the corresponding multiple successive correction steps hope to achieve.

[0031] In one embodiment, the trained first deep neural network can be used to predict the correction force (including force and torque) required to achieve the correction of each tooth based on the three-dimensional digital model representing the patient's initial tooth layout and the target tooth layout.

[0032] In some cases, the orthodontic force required for a tooth is the force required to move the tooth. In some cases, the orthodontic force required for a tooth is the reaction force to the support force required to be provided by the tooth. In some cases, the orthodontic force required for a tooth is the combined force of the force required to move the tooth and the reaction force to the support force required to be provided by the tooth.

[0033] In one embodiment, the first deep neural network may be a DGCNN (Deep Graph Convolutional Neural Network). It is understood that, in addition to DGCNN, the first deep neural network may also be any other applicable deep neural network.

[0034] In one embodiment, mechanical analysis tools, such as finite element analysis tools, can be used to simulate orthodontic treatment based on a large amount of case data to obtain the correction force (including force and torque) required for each tooth to achieve the correction target. Then, these data are used as training sets for training the first deep neural network.

[0035] The method of the present application is described in detail below by taking an example of generating an attachment plan for a tooth.

[0036] Please refer to Table 1 below, which is a diagram of the correction force required to achieve the correction target tooth No. 11, predicted using the first deep neural network based on a three-dimensional digital model representing the patient's initial tooth layout and the target tooth layout.

[0037] Table 1

[0038] Among them, F x represents the correction force along the x-axis of the local coordinate system, F y represents the correction force along the y-axis of the local coordinate system, F z represents the correction force along the z-axis of the local coordinate system, M x represents the moment about the x-axis of the local coordinate system, M y represents the moment about the y-axis of the local coordinate system, M z Represents the moment around the z-axis of the local coordinate system. In Table 1, the unit of force is N, and the unit of moment is N·mm.

[0039] In yet another embodiment, mechanical analysis tools, such as finite element analysis tools, may also be used to simulate orthodontic treatment based on the orthodontic treatment plan to calculate the correction force required for each tooth to achieve the correction target.

[0040] In yet another embodiment, a linear model may be used to calculate the correction force required for each tooth to achieve the correction target based on the orthodontic treatment plan.

[0041] In 103 , based on the material information of the shell-shaped dental appliance, a threshold value of the force applied to each tooth in each direction is determined.

[0042] In one embodiment, the material information of the shell-shaped dental appliance includes the type and thickness of the material.

[0043] The force threshold of a shell-shaped dental appliance on a tooth in all directions refers to the maximum force (including force and torque) that it can apply to a tooth in all directions.

[0044] In one embodiment, mechanical analysis tools, such as finite element analysis tools, can be used to perform simulation based on a large amount of case data to obtain statistical results of the force thresholds of shell-shaped dental appliances made of various materials on a tooth in various directions.

[0045] In one example, for a selected material model of a shell-shaped dental appliance, the thresholds of the forces along the x, y, and z axes that can be applied to tooth No. 11 are all 5 N, and the thresholds of the moments around the x, y, and z axes are all 100 N·mm.

[0046] It should be noted that for different teeth, the force threshold and torque threshold of the same material may be different.

[0047] A large number of experiments show that the force threshold of the shell-shaped dental appliance on each tooth in each direction can be determined more accurately based on the above statistical results.

[0048] In 105, the teeth to which accessories need to be added and the types of accessories are determined according to the correction force required for each tooth and the force threshold of the shell-shaped dental appliance.

[0049] In one embodiment, the orthodontic force required for a tooth in various directions (including force and torque) and the corresponding force threshold can be used to determine the orthodontic force that needs to be enhanced for the tooth, and based on this, it can be determined whether the tooth needs to be added with an accessory and the type of accessory that needs to be added. The type of accessory includes the basic shape of the accessory, but does not include the size of the accessory.

[0050] In the above example, in order to achieve the correction goal, the absolute value of the correction force along the x-axis direction and the absolute value of the correction force along the y-axis direction required for tooth No. 11 both exceed the corresponding thresholds, and the correction force and correction torque required in other directions do not exceed the corresponding thresholds. Therefore, when determining the attachment plan for tooth No. 11, only the correction force required along the x-axis direction and along the y-axis direction need to be considered.

[0051] Since the absolute value of the correction force required for tooth No. 11 along the x-axis direction is 9.122063 N, which is significantly greater than the absolute value of the correction force required along the y-axis direction of 6.546936 N, and the direction of the correction force required along the x-axis is negative, an accessory that can increase the correction force along the negative direction of the x-axis can be selected for tooth No. 11 in the accessory database. The accessory database is a pre-established database that includes optional accessory types.

[0052] The above is a simple example of determining whether an attachment is needed for a tooth and the type of attachment that needs to be added based on the correction force required for a tooth and the threshold of the corresponding correction force that the shell-shaped dental appliance can apply to the tooth. Some attachments can increase the correction force (force and / or torque) in two or more directions at the same time. If the correction force required in these directions for a tooth exceeds the corresponding threshold, then this type of attachment can be selected for the tooth accordingly.

[0053] In one embodiment, the teeth of a dentition (maxillary dentition or mandibular dentition) can be prioritized according to the orthodontic force required for each tooth in the dentition, and the attachment posture (including position and posture) and size can be determined for each tooth from high to low priority.

[0054] The following is a simple example of tooth priority sorting: the maximum correction force required for tooth No. 11 is 10 N, and the maximum correction force required for tooth No. 12 is 20 N, so the priority of tooth No. 12 is higher than that of tooth No. 11. The above is just a simple example. If the correction forces and / or correction torques in multiple different directions required by a tooth exceed the corresponding thresholds, these correction forces and / or correction torques can be comprehensively considered when making priority sorting.

[0055] In 107, an installation feasible domain is created for each of the accessories.

[0056] The feasible installation domain of an attachment includes the surface area on the corresponding tooth that allows the attachment to be installed.

[0057] In one embodiment, when creating an installation feasible domain for an attachment, tooth surface constraints, gum line constraints, collision constraints, etc. need to be considered.

[0058] In one embodiment, the tooth surface constraint may be that the attachment must be mounted on the labial / buccal surface of the tooth. In another embodiment, the tooth surface constraint may be that the attachment must be mounted on the lingual surface of the tooth. In another embodiment, the tooth surface constraint may be that the attachment must be mounted on the labial / buccal surface or the lingual surface of the tooth.

[0059] Gum line constraint means that the attachment must be located greater than a predetermined distance from the gum line, for example, 1 mm.

[0060] Collision constraint means that the current attachment cannot collide with the adjacent teeth of the current tooth (including the adjacent teeth of the current dentition and the adjacent teeth of the opposing jaw).

[0061] In one embodiment, for the current tooth, whether the collision constraint is satisfied may be calculated based on the minimum size of the corresponding attachment.

[0062] In one embodiment, for the current tooth, a signed distance function (SDF) can be created based on a three-dimensional digital model representing multiple successive tooth layouts of the upper and lower jaw dentition from an initial tooth layout to a target tooth layout. Based on the signed distance function, it can be quickly determined whether the current attachment satisfies the collision constraint.

[0063] It can be understood that, in addition to SDF, any other applicable method for calculating the distance or collision value may also be used.

[0064] Based on the above constraints, a mounting feasible domain M can be created on the tooth surface corresponding to the current attachment.

[0065] In yet another embodiment, when creating the feasible domain M, the collision constraint may be ignored and the feasible domain M may be created based only on the tooth surface constraint and the gum line constraint.

[0066] In 109, the objective function is solved to obtain the attachment installation posture and geometric shape that can provide the maximum correction force / torque along the correction force / torque direction based on which the attachment type is selected.

[0067] In one embodiment, the objective function can be expressed as , where t represents the current attachment posture, s represents the current attachment geometry, where the attachment geometry includes the basic shape and size of the attachment. The process of solving the objective function is to find the attachment posture and geometry that can provide the maximum correction force / torque along the correction force / torque direction based on which the current attachment type is selected. Since the shape of the attachment has been determined before, the objective function is mainly to optimize the posture and size of the attachment.

[0068] In one embodiment, for the current accessory, there are several preset sizes to choose from, and the solution to the objective function can select the optimal size from the preset sizes. In another embodiment, for the current accessory, there is no fixed size, and the solution to the objective function can calculate the optimal size.

[0069] In one embodiment, the height (the dimension along the labiolingual or buccolingual direction) of the attachment may be fixed, and the width and length may be variable. In another embodiment, the height, width, and length of the attachment may all be variable.

[0070] In one embodiment, an upper limit and a lower limit may be set for the variable size of the attachment, and when solving the objective function, the optimal solution is sought within this range.

[0071] When solving the objective function, the following conditions must be met:

[0072] In one embodiment, It can be a function that calculates the total force / torque that the shell-shaped dental appliance can provide to a tooth after adding the attachment based on the posture and geometry of the attachment. It can be obtained through machine learning or explicit modeling. In this case, f represents the total correction force / torque required based on which the current attachment type is selected.

[0073] In yet another embodiment, It can be a function that calculates the difference in force / torque that a shell-shaped dental appliance can provide to a tooth before and after adding the attachment based on the posture and geometry of the attachment. In this case, f represents the difference between the total required correction force / torque based on which the current attachment type is selected and the force / torque threshold that the shell-shaped dental appliance can provide before adding the attachment.

[0074] In one embodiment, in the process of finding the optimal solution for the posture and size of an attachment of a tooth, it can be required that the attachment satisfies the collision constraint at each step of orthodontic treatment using a shell-shaped dental appliance. That is, in each tooth layout from the initial tooth layout to the target tooth layout, the SDF satisfies the condition greater than 0. Otherwise, it is considered that no feasible solution can be found for the posture and size of the attachment, and the attachment is skipped, and the optimal solution for the posture and size of the next attachment is found.

[0075] In one embodiment, a nonlinear constrained optimization algorithm may be used to solve the objective function, such as a trust-constr algorithm. It is understood that in addition to the above method, other applicable methods may also be used to solve the objective function, such as a genetic algorithm, reinforcement learning, and gradient descent.

[0076] Please refer to Figure 2 , which is an interface of a computer program for generating attachment plans for a shell-shaped dental appliance in one embodiment of the present application, and shows the attachment plan generated for tooth No. 11 using the method of the present application.

[0077] In one embodiment, if no feasible solution is found for the current attachment, the attachment is skipped and the solution is continued for the next attachment.

[0078] As described above, when determining which teeth need to add accessories and what type of accessories to add, the teeth in a dentition (maxillary dentition or mandibular dentition) can be prioritized. In one embodiment, the optimal solution for the posture and size of the corresponding attachment can be obtained for each tooth that needs to add an attachment based on the priority ranking. For example, in the above example, the priority of tooth No. 12 is higher than the priority of tooth No. 11, so the optimal solution for the posture and size of the attachment of tooth No. 12 is first obtained, and then the optimal solution for the posture and size of the attachment of tooth No. 11 is obtained.

[0079] In one embodiment, before finding the optimal solution for the posture and size of the attachments of the first tooth, if the optimal solution for the posture and size of the attachments of one or more teeth has been found, then in the process of finding the optimal solution for the posture and size of the attachments of the first tooth, when calculating the SDF, the three-dimensional digital models of these teeth can be three-dimensional digital models with corresponding attachments added.

[0080] In the process of finding the optimal solution for the posture and size of an accessory, whether the collision constraints are met is calculated for each correction step (i.e., from the initial tooth layout to the target tooth layout). Therefore, the method of the present application fully considers the situation of each correction step and realizes the personalized design of the accessory solution.

[0081] This application adopts Function that can more accurately calculate the force / torque that can be provided based on the position and geometry of the attachment.

[0082] In the above embodiment, the objective function aims to find the optimal solution of the posture and size of an accessory, which can provide the maximum corresponding correction force to be enhanced. In another embodiment, the objective function can also be set to find the optimal solution of the posture and size of an accessory, which can provide the corresponding correction force to be enhanced greater than or equal to the corresponding correction force required by the corresponding tooth, and the size of the accessory is the smallest.

[0083] Although various aspects and embodiments of the present application are disclosed herein, other aspects and embodiments of the present application will be apparent to those skilled in the art in light of the present application. The various aspects and embodiments disclosed herein are for illustrative purposes only and not for limiting purposes. The scope and subject matter of the present application are determined solely by the appended claims.

[0084] Likewise, various diagrams may illustrate exemplary architectures or other configurations of the disclosed methods and systems that aid in understanding the features and functions that may be included in the disclosed methods and systems. The claimed content is not limited to the exemplary architectures or configurations shown, and the desired features may be implemented with various alternative architectures and configurations. In addition, for flow charts, functional descriptions, and method claims, the order of blocks presented herein should not be limited to various embodiments that are implemented in the same order to perform the described functions, unless otherwise clearly indicated in the context.

[0085] Unless otherwise expressly noted, the terms and phrases used herein and their variations should be interpreted as open ended, not restrictive. In some instances, the appearance of broad words and phrases such as "one or more", "at least", "but not limited to", or other similar terms should not be understood as an intent or need to indicate a narrowing of the example where such broad terms may not be present.

Claims

1. A computer-implemented method for generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance, comprising: According to the correction forces required for each tooth of the patient's dentition to achieve the correction target, and the thresholds of the correction forces that the shell-shaped dental appliance can apply to each tooth without accessories, the correction forces that need to be enhanced for each tooth are determined, and based on this, the teeth to which accessories need to be added and the types of accessories to be added are determined, wherein the types of accessories include the shapes of the accessories; Establishing a feasible installation domain for each of the accessories, each feasible installation domain comprising an area on the surface of a corresponding tooth where the corresponding accessory is allowed to be installed; and The optimal solution of the posture and size of each attachment is calculated based on the feasible domain using the objective function, wherein the corresponding correction force to be enhanced that can be provided by the optimal solution of the posture and size of each attachment is greater than or equal to the corresponding correction force required by the corresponding tooth.

2. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as claimed in claim 1, characterized in that The optimal solution for the position and size of each of the accessories can provide the maximum corresponding correction force that needs to be enhanced.

3. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as claimed in claim 1, characterized in that The corrective force is one of the following: force along the x-axis of the local tooth coordinate system, force along the y-axis of the local tooth coordinate system, force along the z-axis of the local tooth coordinate system, moment around the x-axis of the local tooth coordinate system, moment around the y-axis of the local tooth coordinate system, and moment around the z-axis of the local tooth coordinate system.

4. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as claimed in claim 1, characterized in that It also includes: calculating the correction forces required for each tooth in the dentition to achieve the correction target based on the initial tooth layout and the target tooth layout of the dentition.

5. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as claimed in claim 4, characterized in that: The correction forces required for each tooth of the dentition to achieve the correction target are calculated based on a three-dimensional digital model representing the initial tooth layout and the target tooth layout of the dentition.

6. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as recited in claim 5, wherein: The correction forces required for each tooth of the dentition to achieve the correction target are predicted using a trained deep neural network based on a three-dimensional digital model representing the initial tooth layout and the target tooth layout of the dentition.

7. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as recited in claim 6, wherein: The training data set used to train the deep neural network is obtained by simulating a large number of cases using mechanical analysis tools.

8. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance of claim 1, wherein: It also includes: determining thresholds of various correction forces that the shell-shaped dental appliance can apply to various teeth without accessories based on material information of the shell-shaped dental appliance, wherein the material information includes the type and thickness of the material.

9. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as recited in claim 8, wherein: The threshold values ​​of the correction forces that the shell-shaped dental appliance can apply to each tooth without accessories are determined based on the material information and statistical results of the shell-shaped dental appliance, and the statistical results are obtained by statistically analyzing the data obtained by simulating a large number of cases using mechanical analysis tools.

10. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance of claim 1, wherein: The installation feasible domain of an attachment is created based on the following two constraints: the attachment is located on the labial / buccal surface of the corresponding tooth; and the distance between the attachment and the gum line is greater than a predetermined distance.

11. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance of claim 10, wherein: The installation feasible domain of the attachment is also created based on the following constraint condition: the attachment of minimum size has no collision with the adjacent teeth in the jaw and the adjacent teeth in the opposing jaw.

12. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance of claim 1, wherein: For an attachment, the optimal solution of the objective function satisfies the following two conditions: in all correction steps, the attachment has no collision with the adjacent teeth in the jaw and the adjacent teeth in the opposing jaw; and the posture of the attachment belongs to the installation feasible domain.

13. The computer-implemented method of generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance of claim 1, wherein: In the process of solving the objective function for an accessory, the ratio of the length, width and height of the accessory is variable.

14. A computer-implemented system for generating attachment plans for orthodontic treatment using a shell-shaped dental appliance, comprising: processor; as well as A storage device storing a computer program for generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance. When the computer program is run, the processor will execute the method for generating an attachment plan for orthodontic treatment using a shell-shaped dental appliance as described in claim 1.

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