Design and manufacturing method of dental correction system, electronic equipment and storage medium

Abstract

The invention discloses a design method of a dental correction system. The design method comprises the following steps: acquiring a first dental digital model representing a first dentition layout and a second dentition layout; obtaining a series of first digital target tooth jaw models based on the first tooth jaw digital model, the second dentition layout and the correction parameters; sequentially obtaining appliance digital models corresponding to the first digital target tooth jaw models, simulating the wearing process of the appliance to check the correction effect, and determining whether to continue simulation based on the next appliance digital model or to obtain the previous first digital target tooth jaw model as a first tooth jaw digital model based on the check result, the scheme design is corrected again after correction parameters are adjusted; all the first digital target tooth jaw models conforming to the correction indexes are obtained to serve as a final series of digital target tooth jaw models, the correction effect of the appliance in each correction step can be guaranteed, and the invention further discloses a corresponding manufacturing method, electronic equipment and a storage medium.

Description

Technical Field

[0001] The present invention relates to the technical field of dental orthodontics, and in particular to a design and manufacturing method of a dental correction system, and electronic equipment and storage medium. Background Art

[0002] In recent years, in the field of dental orthodontics, shell-shaped dental appliances using bracketless invisible orthodontic technology have become increasingly popular due to their advantages of beauty and convenience when worn. Bracketless invisible orthodontic technology is that patients wear a series of transparent shell orthodontic appliances to move their teeth from the initial position to the target position.

[0003] In the existing design and manufacture of braces, tooth arrangement design occupies a very important position. With the rapid development of computer technology, the realization of tooth arrangement design in the three-dimensional space environment of virtual dental orthodontic system is gradually replacing the traditional manual tooth arrangement process. At present, when designing a virtual orthodontic plan, it is generally necessary to first obtain the patient's intraoral data, and then determine the patient's final treatment target position based on the experience of the clinician, and design a series of corresponding digital dental models according to the treatment target. Then, based on this series of digital dental models, a series of dental appliances that can reposition the patient's teeth from the initial layout to the treatment target layout can be obtained. Generally speaking, each treatment step can correspond to a pair of dental appliances, and a pair of dental appliances can be worn for about two weeks.

[0004] However, in the current virtual correction plan design, the rationality of the design of the dental appliance for each correction step has not been verified. In fact, the correction ability of the dental appliance for each correction step may be affected by its structure and material, or the force generated by the interaction with the teeth, and its expression rate may not achieve the desired result in many cases. At this time, if such an appliance is still used for correction, the actual wearing effect will deviate from the expected wearing effect. When this deviation is large, the appliance for the next correction step may not be suitable for wearing, increasing the patient's discomfort when wearing the appliance. Even if the deviation of the current correction step is not large, if no intervention is made, as the accumulated deviation of multiple correction steps gradually increases, it will also cause discomfort in wearing subsequent appliances, affecting the correction effect. What's worse, it may make subsequent appliances impossible to wear, and the correction plan has to be redesigned. Summary of the invention

[0005] The main purpose of the present invention is to propose a design, manufacturing method, electronic device and storage medium for a dental correction system, aiming to avoid the problem that in the current correction scheme design, there is a deviation between the actual wearing result of the braces and the expected result of certain correction steps, and the deviation itself or the accumulation of deviations of multiple correction steps leads to the problem that the subsequent braces cannot be worn or are uncomfortable to wear.

[0006] To achieve the above object, an embodiment of the present invention provides a method for designing a dental correction system, comprising the following steps:

[0007] Step S1, obtaining a first dental digital model and a second dentition layout, wherein the first dental digital model represents a first dentition layout of a patient's dentition;

[0008] Step S2, based on the first digital model of the jaw, the second dentition layout, and the correction parameters, a series of first digital target jaw models are obtained by using an interpolation method, wherein the series of first digital target jaw models correspond to a series of orthodontic states in which the patient's dentition is gradually and progressively moved from the dentition layout represented by the first digital model of the jaw to the second dentition layout;

[0009] Step S3, sequentially obtaining the digital models of the orthodontic appliances corresponding to the first target digital dental models, simulating the wearing process of the orthodontic appliances based on the combination of the digital model of the orthodontic appliances and the first digital target dental model before the current first digital target dental model, so as to verify the correction effect of the digital model of the orthodontic appliances, if the correction effect of the digital model of the orthodontic appliances meets the correction index, returning to step S3, continuing to perform the wearing simulation of the orthodontic appliances based on the combination of the next digital model of the orthodontic appliances and the first digital target dental model before the corresponding current first digital target dental model, until the wearing simulation result based on the digital model of the orthodontic appliances representing the second dentition layout meets the corresponding correction index, and entering step S5, wherein the first digital model of the orthodontic appliances is used as the first digital target dental model before the first digital model of the first orthodontic appliances; otherwise, entering step S4;

[0010] Step S4, obtaining a first digitized target dental model before the current first digitized target dental model as the first dental digital model, and adjusting the correction parameters, and returning to step S2;

[0011] Step S5, obtaining all first digital target jaw models that meet the correction index as a series of digital target jaw models of the final design solution, wherein the series of digital target jaw models are used to gradually move the patient's teeth from the first dentition layout to the second dentition layout.

[0012] Optionally, the simulating the wearing process of the appliance based on the combination of the digital model of the appliance and the first digital target dental model before the current first digital target dental model to verify the correction effect of the digital model of the appliance includes:

[0013] Obtain the dental finite element model of the previous first digital target dental arch model of the current first digital target dental arch model and the finite element model of the appliance corresponding to the digital appliance model, where the dental finite element model at least includes a tooth finite element model, an alveolar bone finite element model, and a periodontal ligament finite element model;

[0014] Wear the finite element model of the appliance on the dental finite element model for finite element simulation of appliance wearing;

[0015] Based on the finite element simulation, obtain simulation results including at least one of the following: the simulated tooth layout reached by the dental finite element model after finite element simulation and the stress distribution data of the alveolar bone finite element model in the dental finite element model;

[0016] Evaluate the orthodontic effect of the digital appliance model according to the simulation results.

[0017] Optionally, the step of wearing the finite element model of the appliance on the dental finite element model for finite element simulation of appliance wearing includes:

[0018] Constrain the degrees of freedom of the tooth finite element model in the dental finite element model;

[0019] Wear the finite element model of the appliance on the dental finite element model and apply a load;

[0020] After establishing contact, remove the load and release all contact constraints on the appliance to obtain the finite element model of the appliance worn on the dental arch;

[0021] Release the constraint on the degrees of freedom of the tooth finite element model to perform finite element analysis on the movement of the teeth.

[0022] Optionally, in the constraint of the degrees of freedom of the tooth finite element model in the dental finite element model, restrict the relative degrees of freedom of the contact surface between the periodontal ligament finite element model and the tooth finite element model in the dental finite element model, and / or restrict the relative degrees of freedom of the contact surface between the periodontal ligament finite element model and the alveolar bone finite element model in the dental finite element model.

[0023] Optionally, the simulated tooth layout reached by the dental finite element model after finite element simulation is obtained by the following method:

[0024] Wear the finite element model of the appliance on the dental finite element model to interact, obtain the interaction force between the two, and when the change in the interaction force is less than a set threshold, the tooth alignment represented by the dental finite element model is the simulated tooth layout.

[0025] Optionally, the simulated tooth layout obtained after finite element simulation of the dental arch finite element model is obtained by the following method:

[0026] When the orthodontic force provided by the orthodontic appliance finite element model reaches mechanical equilibrium with the impedance force generated by the deformation of the periodontal tissue in the dental arch finite element model, the tooth arrangement represented by the dental arch finite element model is the simulated tooth layout.

[0027] Optionally, evaluating the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result includes:

[0028] Comparing the simulated tooth layout obtained after finite element simulation of the dental arch finite element model with the tooth arrangement represented by the current first digital target dental arch model, where the tooth arrangement represented by the current first digital target dental arch model is the target design layout of the dental arch finite element model;

[0029] If the deviation between the two is less than a preset threshold, it is determined that the orthodontic effect of the digital model of the orthodontic appliance meets the orthodontic index; otherwise, it is determined that the orthodontic effect of the digital model of the orthodontic appliance does not meet the orthodontic index.

[0030] Optionally, evaluating the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result includes:

[0031] Calculating the position deviation of the corresponding teeth to be moved between the simulated tooth layout and the target design layout;

[0032] If the position deviation of a certain tooth to be moved is greater than the corresponding preset threshold, it is determined that the orthodontic effect of the digital model of the orthodontic appliance does not meet the orthodontic index.

[0033] Optionally, evaluating the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result includes:

[0034] Determining the characteristic teeth in the patient's dental arch;

[0035] Calculating the position deviation of the corresponding characteristic teeth between the simulated tooth layout and the target design layout;

[0036] If the position deviation of a certain characteristic tooth is greater than the corresponding preset threshold, it is determined that the orthodontic effect of the digital model of the orthodontic appliance does not meet the orthodontic index.

[0037] Optionally, evaluating the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result includes:

[0038] Obtaining the stress distribution data of the alveolar bone finite element model when the tooth finite element model in the dental arch finite element model reaches the target design layout, where the target design layout is the tooth arrangement represented by the current first digital target dental arch model;

[0039] When the stress distribution data of the alveolar bone finite element model reach the alveolar bone remodeling threshold, it is determined that the orthodontic effect of the digital model of the appliance meets the correction index; otherwise, it is determined that the orthodontic effect of the digital model of the appliance does not meet the correction index.

[0040] Optionally, when obtaining the stress distribution data of the alveolar bone finite element model when the tooth finite element model in the dental arch finite element model reaches the target design layout, it includes:

[0041] Selecting the boundary conditions of the dental arch finite element model by using the appliance finite element model, and the boundary conditions of the dental arch finite element model include the pose change and / or the load received by the dental arch finite element model;

[0042] Using the dental arch finite element model and the corresponding boundary conditions to obtain a second dental arch finite element model and performing nonlinear finite element calculation to obtain the stress distribution data of the alveolar bone finite element model.

[0043] Optionally, the alveolar bone remodeling threshold is the critical stress value that triggers alveolar bone remodeling.

[0044] Optionally, the correction parameters include one or more of the single-step movement amounts of different movement modes of each tooth in the patient's dental arch, and the different movement modes of each tooth include one or more of the movement modes of overall movement, rotation, torque, uprighting, extrusion, and intrusion of the tooth.

[0045] Optionally, adjusting the correction parameters includes:

[0046] Determining the characteristic teeth in the patient's dental arch;

[0047] Adjusting at least one correction parameter of the characteristic teeth.

[0048] Optionally, adjusting the correction parameters includes:

[0049] Determining the first movement mode of each tooth in the patient's dental arch, and the first movement mode is obtained based on the expression rate of each tooth position tooth in each of the movement modes;

[0050] Adjusting the correction parameter corresponding to the first movement mode of at least one tooth to be moved.

[0051] Optionally, the tooth to be moved is the characteristic tooth in the patient's dental arch determined in advance.

[0052] To achieve the above object, the present invention also provides a design device for a dental orthodontic system, including:

[0053] A dental arch layout acquisition module, configured to acquire a first dental digital model and a second dental arch layout, where the first dental digital model represents the first dental arch layout of a patient's dentition;

[0054] An orthodontic treatment plan cyclic design module, configured to obtain a series of first digital target dental models by using an interpolation method based on the first dental digital model, the second dental arch layout, and correction parameters, where the series of first digital target dental models correspond to a series of tooth orthodontic states for gradually moving the patient's dentition from the dental arch layout represented by the first dental digital model to the second dental arch layout;

[0055] A simulation verification module, configured to sequentially acquire an orthodontic appliance digital model corresponding to each of the first digital target dental models, simulate the wearing process of the orthodontic appliance based on the combination of the orthodontic appliance digital model and the previous first digital target dental model of the current first digital target dental model to verify the orthodontic effect of the orthodontic appliance digital model. If the orthodontic effect of the orthodontic appliance digital model meets the correction index, return to the current simulation verification module, and continue to perform the wearing simulation of the orthodontic appliance based on the combination of the next orthodontic appliance digital model and the previous first digital target dental model corresponding to the current first digital target dental model until the wearing simulation result based on the orthodontic appliance digital model representing the second dental arch layout meets the corresponding correction index, and enter the orthodontic treatment plan generation module, where the first dental digital model serves as the previous first digital target dental model of the first orthodontic appliance digital model; otherwise, start the adjustment module;

[0056] An adjustment module, configured to acquire the previous first digital target dental model of the current first digital target dental model as the first dental digital model, adjust the correction parameters, and return to the orthodontic treatment plan cyclic design module;

[0057] An orthodontic treatment plan generation module, configured to acquire all the first digital target dental models that meet the correction index as a series of digital target dental models of the final design plan, where the series of digital target dental models are used to gradually move the patient's teeth from the first dental arch layout to the second dental arch layout

[0058] To achieve the above object, the present invention further provides a manufacturing method for a dental orthodontic system, including the following steps:

[0059] Obtain a series of digital target dental models based on the above design method;

[0060] Manufacture a male mold of the orthodontic appliance according to the digital target dental model;

[0061] Manufactured by using a hot-pressing film forming process or an additive manufacturing process to obtain a series of shell-shaped dental appliances, which are used to gradually move the patient's teeth from a first dentition layout to a second dentition layout.

[0062] To achieve the above object, the present invention further provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the above-mentioned design method of the dental orthodontic system or the above-mentioned manufacturing method of the dental orthodontic system.

[0063] To achieve the above object, the present invention further provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the above-mentioned design method of the dental orthodontic system or the above-mentioned manufacturing method of the dental orthodontic system is implemented.

[0064] Compared with the prior art, the design, manufacturing method, electronic device and storage medium of a dental orthodontic system of the present invention have the following beneficial effects:

[0065] 1. In the present invention, by first checking the orthodontic effect of each dental appliance in the orthodontic treatment plan designed with the first layout and the second layout, when the orthodontic result of the dental appliance in a certain orthodontic step is not ideal, the orthodontic treatment plan is redesigned with the target design layout of the previous orthodontic step and the second layout, and the orthodontic effect of each dental appliance in the redesigned orthodontic treatment plan is checked. The orthodontic treatment plan is designed in multiple rounds in sequence, so that the orthodontic results of the dental appliances in each orthodontic step in the finally obtained orthodontic treatment plan all meet the expected effects, and there will be no problem that subsequent appliances cannot be worn or discomfort occurs due to the deviation between the actual wearing result and the expected result, improving the orthodontic efficiency of the patient's teeth.

[0066] 2. When checking the orthodontic effect of each dental appliance designed in each round of orthodontic treatment plan in the present invention, by obtaining the finite element model of the appliance in the current orthodontic step and the finite element model of the dental arch of the previous first digital target dental arch model of the current first digital target dental arch model, and wearing the finite element model of the appliance on the finite element model of the dental arch for finite element simulation analysis, the orthodontic effect of the finite element model of the appliance is determined based on the finite element analysis result, without performing complex operations such as manufacturing and scanning physical models for each orthodontic step, saving the verification cost.

[0067] 3. When adjusting the correction parameters, the present invention adjusts the correction parameters based on the selected characteristic teeth and the correction parameters corresponding to the selected characteristic teeth or the first movement mode determined for the characteristic teeth, so that the tooth correction states represented by a series of first digital target dental models designed in the next round of orthodontic treatment plan change from those in the first digital target dental model designed in the previous round of orthodontic treatment plan, thereby improving the design efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not limit the embodiments.

[0069] Figure 1 It is a flowchart of the steps of a design method for a dental orthodontic system in an embodiment of the present application;

[0070] Figure 2 It is a schematic structural diagram of a dental digital model in an embodiment of the present application;

[0071] Figure 3 It is a flowchart of step S3 in an embodiment of the present application;

[0072] Figure 4 It is a schematic structural diagram of a design device for a dental orthodontic system in another embodiment of the present invention;

[0073] Figure 5 It is a schematic structural diagram of an electronic device provided in another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are provided to help the reader better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented. The following division of each embodiment is for convenience of description and should not constitute any limitation to the specific implementation manner of the present application. Each embodiment can be combined and cross-referenced with each other without conflict.

[0075] To make the drawings concise, only the parts related to the present invention are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown as one of them, or only one of them is labeled. In this document, "one" not only means "only this one", but also means "more than one" situation.

[0076] In each embodiment of the present application, the "anterior tooth region" and "posterior tooth region" are defined according to the tooth classification on pages 36-38 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press. The posterior tooth region includes premolars and molars, which are the teeth shown as 4-8 in the FDI notation. The teeth in the anterior tooth region are those shown as 1-3 in the FDI notation, and the teeth in the anterior tooth region include central incisors, lateral incisors, and canines. In addition, for the teeth in the deciduous tooth stage, the "anterior tooth region" and "posterior tooth region" are defined according to the tooth classification of deciduous teeth on pages 40-41 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including three categories: deciduous incisors, deciduous canines, and deciduous molars. The anterior tooth region includes deciduous incisors and deciduous canines, among which the deciduous incisors include deciduous central incisors and deciduous lateral incisors, and the posterior tooth region includes deciduous molars, among which the deciduous molars include the first deciduous molar and the second deciduous molar.

[0077] As can be seen from the background art, current orthodontic treatment plans directly manufacture a series of shell-shaped orthodontic appliances for gradually moving the patient's teeth from the first dentition layout to the second dentition layout. Each shell-shaped orthodontic appliance corresponds to one orthodontic treatment step and is worn for about two weeks. When designing the current orthodontic treatment plan, whether the design of the orthodontic appliance for each treatment step is reasonable is not verified. In fact, the orthodontic ability of the orthodontic appliance for each treatment step may be affected by its structure and material, or by the force generated by the interaction with the teeth. In many cases, its expression rate may not reach the expected result. At this time, if such an orthodontic appliance is still used for wearing and treatment, there will be a deviation between the actual wearing effect and the expected wearing effect. When this deviation is large, it may cause the orthodontic appliance for the next treatment step to be unsuitable for wearing, increasing the discomfort of the patient wearing the orthodontic appliance; even if the deviation of the current treatment step is not large, but if no intervention is made, as the deviation accumulated by multiple treatment steps gradually becomes larger, it will also cause discomfort in wearing the subsequent orthodontic appliance, affecting the orthodontic effect. Even more seriously, it may make the subsequent orthodontic appliance unable to be worn, so that the orthodontic treatment plan has to be redesigned.

[0078] The following will specifically describe the implementation details of the design method of the dental orthodontic system recorded in the present application in combination with specific embodiments. The following content is only the implementation details provided for convenience of understanding and is not necessary for implementing this solution.

[0079] As Figure 1 shown, an embodiment of the present invention proposes a design method for a dental orthodontic system, which includes the following steps:

[0080] Step S1, obtaining a first dental digital model and a second layout, where the first dental digital model represents the first layout of the patient's dentition.

[0081] A dental digital model generally refers to a computer - processable data model used to guide the manufacture of a physical tooth model (i.e., a positive mold), which is usually a virtual three - dimensional model of the tooth state. In this step, the first dental digital model obtained is the first layout corresponding to the patient's dentition. The first layout can be the initial dentition layout when the patient starts orthodontic treatment, also known as the original dentition layout, or it can be an intermediate dentition layout after a period of orthodontic treatment. In the design of an orthodontic treatment plan, it is also necessary to obtain a second layout representing the orthodontic design goal. This second layout can be the final dentition layout of the designed final orthodontic goal for the patient, or it can be the stage - goal dentition layout for a certain stage of orthodontic treatment.

[0082] Taking the first layout as the initial tooth layout as an example, for the acquisition of the first dental digital model representing the patient's initial tooth layout, a digital model representing the initial tooth layout can be obtained by means such as tomographic X - ray scanning (CAT scan), digital tomosynthesis (CT), cone - beam CT scan (CBCT), magnetic resonance imaging (MRI), intraoral optical scanning, etc. Or, first, a plaster cast of the patient's teeth can be made by conventional means, and then the plaster cast can be scanned by a scanning device such as a laser scanning device or a CT scanning device to obtain a dental digital model representing the initial tooth layout. Generally, the dental digital model can include models of teeth and their surrounding tissues. For example, teeth can include the crown part, the neck part, and the root part; and the surrounding tissues can include the gingiva and the alveolar bone, etc. As Figure 2 shown, the dental digital model includes the tooth crown 1, the tooth root 4, the periodontal ligament 2, and the alveolar bone 3, where the periodontal ligament 2 is outside the tooth root 4, and the alveolar bone 3 wraps outside the periodontal ligament 2.

[0083] It should be noted that the above - mentioned first dental digital model can include only the maxillary dentition, or only the mandibular dentition, or both the maxillary dentition and the mandibular dentition at the same time. The present invention is not limited thereto.

[0084] Step S2: Based on the first dental digital model, the second layout, and the correction parameters, a series of first digital target dental models are obtained by using the interpolation method. The series of first digital target dental models correspond to a series of tooth orthodontic states in which the patient's dentition is gradually and progressively moved from the dentition layout represented by the first dental digital model to the second layout.

[0085] After obtaining a first digital dental model representing the first layout of a patient's dentition and a second layout representing the orthodontic design goal, interpolation is performed based on the first digital dental model, the second layout, and the determined correction parameters to obtain a series of successive first digital target dental models. This series of first digital target dental models corresponds to the dental orthodontic states of each orthodontic step in gradually progressing the patient's teeth from the first layout to the second layout. Specifically, these successive first digital target dental models are generated by the position differences of the selected patient's teeth between the first layout and the second layout and interpolating these position differences. This interpolation can be completed in multiple discrete steps based on the correction parameters, generally at least three orthodontic steps, more often at least 20, and even 40 or more. In some embodiments, this interpolation can use linear interpolation for some or all of the position differences between the first layout and the second layout. Of course, non-linear interpolation can also be used. The present invention is not limited thereto. In the present invention, the design of a series of first digital target dental models based on the first layout and the second layout is called the first round of orthodontic design.

[0086] Taking linear interpolation as an example, the interpolated position differences correspond to the movement of the teeth and are affected by the correction parameters. The correction parameters include one or more of the single-step movement amounts of different movement modes of each tooth in the patient's dentition between the first layout and the second layout. In various embodiments of the present invention, the different movement modes of the teeth include overall movement, rotation, torque, uprighting, extrusion, and intrusion movement modes of the teeth. The correction parameters directly affect the dental orthodontic states corresponding to each orthodontic step in the interpolation process of the orthodontic treatment plan. That is to say, under the determined first layout and second layout, different correction parameters will result in different first digital target dental models obtained according to the interpolation method. For example, when the single-step movement amount of the overall movement of a certain tooth of the patient is 1 mm and the single-step movement amount is 0.5 mm, the dental orthodontic states corresponding to the first digital target dental models obtained by designing the orthodontic treatment plan are different.

[0087] Step S3: Sequentially obtain the digital models of the appliances corresponding to each of the first digital target dental arch models. Based on the combination of the digital model of the appliance and the previous first digital target dental arch model of the current first digital target dental arch model, simulate the wearing process of the appliance to verify the orthodontic effect of the digital model of the appliance. If the orthodontic effect of the digital model of the appliance meets the correction criteria, return to Step S3, and continue to simulate the wearing of the appliance based on the combination of the next digital model of the appliance and the previous first digital target dental arch model of the corresponding current first digital target dental arch model until the wearing simulation result of the digital model of the appliance representing the second dental arch layout meets the corresponding correction criteria, and then enter Step S5, where the first dental arch digital model serves as the previous first digital target dental arch model of the first orthodontic appliance digital model; otherwise, enter Step S4.

[0088] In the existing orthodontic treatment plan design, after obtaining a series of first digital target dental arch models designed from the first layout to the second layout, a series of corresponding dental appliances are directly obtained according to the series of first digital target dental arch models, without verifying whether the design of the dental appliance for each orthodontic step is reasonable. When the designed dental appliance is unreasonable, it will greatly affect the final orthodontic effect. Therefore, to ensure the rationality of the design of the dental appliance for each orthodontic step, the present invention verifies the orthodontic results of the dental appliances for each orthodontic step one by one.

[0089] In various embodiments of the present invention, the verification of the orthodontic results of the dental appliances for each orthodontic step is mainly obtained by acquiring the finite element model of the appliance for each orthodontic step and the finite element model of the dental arch representing the initial stage of the current orthodontic step, and performing finite element simulation analysis on the wearing of the appliance. Specifically, as Figure 3 shown, the sequential acquisition of the digital models of the appliances corresponding to each of the first digital target dental arch models, and the simulation of the wearing process of the appliance based on the combination of the digital model of the appliance and the previous first digital target dental arch model of the current first digital target dental arch model to verify the orthodontic effect of the digital model of the appliance includes:

[0090] Step S301: Based on the current first digital target dental arch model, obtain the corresponding finite element model of the appliance.

[0091] The current first digital target dental arch model represents a tooth orthodontic state that conforms to the target tooth layout designed for the current orthodontic step. In some embodiments, a corresponding orthodontic appliance digital model can be generated based on the current first digital target dental arch model, and a corresponding finite element model of the orthodontic appliance can be obtained therefrom. In other embodiments, it is also possible to simulate the process of manufacturing a tooth orthodontic appliance based on the current first digital target dental arch model. Currently, the most commonly used thermoforming process for preparing tooth orthodontic appliances is used. Therefore, the thermoforming process of the orthodontic appliance, the cooling and springback process of the orthodontic appliance, and the cutting process of the orthodontic appliance can be simulated. Based on the simulation process, a corresponding orthodontic appliance digital model can be obtained, and thus a corresponding finite element model of the orthodontic appliance can be obtained. The finite element model of the orthodontic appliance obtained by simulating the process of manufacturing the tooth orthodontic appliance is closer to the actual situation, and the subsequent finite element simulation is more accurate.

[0092] In various embodiments of the present invention, for the purpose of achieving true simulation, the finite element model of the orthodontic appliance includes not only a geometric model but also a constitutive model for simulating the mechanical behavior of the orthodontic appliance. The geometric model of the finite element model of the orthodontic appliance represents the geometric shape of the tooth orthodontic appliance corresponding to the current first digital target dental arch model and the positional arrangement relationship between the teeth. The constitutive model is used to simulate the mechanical behavior of the orthodontic appliance, which mainly depends on the diaphragm material used to manufacture the tooth orthodontic appliance, such as the elastic modulus of the diaphragm material.

[0093] Step S302, obtain the finite element model of the dental arch of the previous first digital target dental arch model of the current first digital target dental arch model.

[0094] In various embodiments of the present invention, the finite element model of the dental arch includes at least a finite element model of teeth, a finite element model of alveolar bone, and a finite element model of periodontal ligament. Similarly, the finite element model of the dental arch includes not only the geometric model of the corresponding first digital target dental arch model but also a constitutive model, as Figure 2 shown, the patient's dental arch has different biological tissues such as dental crowns, tooth roots, periodontal ligaments, and alveolar bones. In the simulation process, different biological tissue structures have different material properties. Therefore, for the finite element model of teeth, it includes the geometric model and constitutive model of the finite element of teeth. The finite element model of the periodontal ligament includes the geometric model and constitutive model of the finite element model of the periodontal ligament. The finite element model of the alveolar bone includes the geometric model and constitutive model of the finite element model of the alveolar bone. Among them, the type of the constitutive model of the finite element model of teeth and the finite element model of alveolar bone can adopt a linear elastic model. The constitutive models of the finite element model of teeth and the finite element model of alveolar bone adopt a linear elastic model, which has a small amount of computation and high computational efficiency. For the finite element model of the periodontal ligament, the type of its constitutive model can be a hyperelastic V-W model or a hyperelastic Yeoh model. Compared with the linear elastic model, the hyperelastic model is closer to the actual periodontal ligament tissue.

[0095] In some embodiments, to simplify the calculation, the relative degrees of freedom between the finite element models in the dental arch finite element model can be restricted. Specifically, the relative degrees of freedom of the contact surface between the tooth finite element model and the periodontal ligament finite element model can be restricted first. For example, the tooth finite element model and the periodontal ligament finite element model can be made to have the same contact surface nodes, thereby restricting their relative degrees of freedom, that is, restricting the contact surface between the tooth root and the periodontal ligament from undergoing relative movement. Then, the relative degrees of freedom of the contact surface between the alveolar bone finite element model and the periodontal ligament finite element model can be restricted. Similarly, the alveolar bone finite element model and the periodontal ligament finite element model can be made to have the same contact surface nodes, thereby restricting their relative degrees of freedom, that is, restricting the contact surface between the alveolar bone and the periodontal ligament from undergoing relative movement.

[0096] Step S303: Wear the orthodontic appliance finite element model on the dental arch finite element model to perform a finite element simulation of the wearing of the orthodontic appliance.

[0097] In the present invention, in the above-mentioned simulation process of wearing the orthodontic appliance, after combining the constraints of the dental arch finite element model and the orthodontic appliance finite element model, non-linear finite element calculation is then performed. In some embodiments, the specific simulation process is as follows: fully constrain the six degrees of freedom of the tooth finite element model in the dental arch finite element model, and then wear the orthodontic appliance finite element model on the dental arch finite element model; apply a load to the orthodontic appliance finite element model worn on the dental arch finite element model; after establishing the contact, remove the previously applied load and release all the contact constraints on the orthodontic appliance to obtain the finite element model of the orthodontic appliance worn on the dental arch, including the stress distribution of the orthodontic appliance worn on the dental arch; finally, release the constraint on the six degrees of freedom of the tooth finite element model and perform a finite element analysis of the orthodontic process.

[0098] Of course, the specific simulation process may not be limited to the above process. Since finite element simulation is a well-known technology in the industry, the specific process will not be elaborated herein.

[0099] Step S304: Based on the finite element simulation, obtain a simulation result including at least one of the following: the simulated tooth layout achieved by the dental arch finite element model after finite element simulation, and the stress distribution data of the alveolar bone finite element model in the dental arch finite element model.

[0100] In some embodiments, when the finite element model of the appliance is worn on the finite element model of the dental arch, the layout of the finite element model of the dental arch will change. The layout changes that occur may include changes in the pose of the finite element model of the teeth or layout changes that occur when subjected to loads. That is to say, on the one hand, the layout change is brought about by the pose change, on the other hand, it is the deformation caused by external forces, and on the other hand, it is the pose change generated by wearing dental appliances or the deformation generated under the action of dental appliances. Therefore, when performing finite element analysis, the boundary conditions of the finite element model of the dental arch in the finite element analysis can be determined accordingly. In some examples, the boundary conditions include the pose change of the finite element model of the dental arch and / or the loads received. That is to say, the influence of the appliance on the pose change and / or the loads received by the dental arch is mainly considered. The loads may include point loads, line loads, surface loads or body loads. In this way, no matter whether the force is applied to a point, a line, a surface or a body, the method provided in this embodiment can be used for force analysis. Taking the pose change and / or the loads received by the finite element model of the dental arch as the boundary conditions, the stress distribution data of the finite element model of the alveolar bone can be obtained through finite element analysis.

[0101] During the actual orthodontic process, alveolar bone remodeling should occur. To ensure the orthodontic effect, it should be ensured that the orthodontic result when the alveolar bone undergoes remodeling has basically reached the orthodontic goal. Therefore, the wearing effect of the appliance can be determined by the stress distribution data on the obtained finite element model of the alveolar bone and the alveolar bone remodeling threshold. The alveolar bone remodeling threshold is the critical stress value that triggers alveolar bone remodeling. Generally speaking, when the finite element model of the teeth reaches a new layout through simulation, at this time, the finite element model of the teeth, the finite element model of the periodontal ligament and the finite element model of the alveolar bone are all in a transient stable state. Alveolar bone remodeling occurs when the stress distribution data of the finite element model of the alveolar bone in the transient stable state is greater than the alveolar bone remodeling threshold and is maintained for a certain period of time. Preferably, in the embodiments of the present invention, the alveolar bone remodeling threshold is 4000 - 5100 pa, and the selection of this threshold conforms to the real oral condition. In the present invention, when the stress distribution data of the finite element model of the alveolar bone in the finite element model of the dental arch reaches the alveolar bone remodeling threshold, if the layout reached by the simulated dental arch reaches the target design layout, it means that the orthodontic result of the current appliance meets the expectation. Or, when the simulated dental arch reaches the designed target design layout, the stress distribution data of the finite element model of the alveolar bone reaches the alveolar bone remodeling threshold, which also indicates that the orthodontic effect of the current appliance meets the expectation. The target design layout is the dental arch layout represented by the current first digital target dental arch model.

[0102] Therefore, in some embodiments, under the combined action of the orthodontic appliance finite element model and the dental arch finite element model (including the tooth finite element model, the periodontal ligament finite element model, and the alveolar bone finite element model), finite element analysis is performed. According to the interaction between the orthodontic appliance finite element model and the dental arch finite element model, stress distribution data of the alveolar bone finite element model of the dental arch finite element model can be obtained through finite element calculation. When the stress distribution data reaches the alveolar bone remodeling threshold, the layout reached by the tooth finite element model in the dental arch finite element model at this time is obtained as the tooth simulation layout.

[0103] It can be seen that in this embodiment, according to the characteristics of osteoclastogenesis and osteogenesis during tooth orthodontics, when the stress distribution data of the alveolar bone finite element model in the dental arch finite element model reaches the alveolar bone remodeling threshold, it is used to judge whether the new layout of the tooth finite element model reaches the preset target design layout, so as to determine whether the orthodontic result of the current orthodontic appliance meets the expectation, and to guide whether to redesign the orthodontic plan to improve the orthodontic efficiency.

[0104] In other embodiments, under the combined action of the orthodontic appliance finite element model and the dental arch finite element model (including the tooth finite element model, the periodontal ligament finite element model, and the alveolar bone finite element model), finite element simulation is performed to obtain the stress distribution data of the alveolar bone finite element model. When the tooth finite element model in the dental arch finite element model reaches the target design layout, the stress distribution data of the alveolar bone finite element model at this time is obtained. The target design layout is the tooth row layout represented by the current first digital target dental arch model.

[0105] During the finite element simulation process, the orthodontic appliance finite element model generates an orthodontic force on the dental arch finite element model. This orthodontic force can cause a certain area of the dental arch finite element model to move or sink in the opposite direction, causing deformation of the periodontal tissue. The deformation on the dental arch finite element model will generate stress, which is used as a resistance force to balance the orthodontic force generated by the orthodontic appliance finite element model. Therefore, the deformation of the periodontal tissue can be used to determine the orthodontic effect of the orthodontic appliance. Therefore, in other embodiments, when the orthodontic force provided by the orthodontic appliance finite element model and the resistance force generated by the deformation of the periodontal tissue in the dental arch finite element model reach mechanical equilibrium, the layout reached by the tooth finite element model in the dental arch finite element model at this time is obtained as the tooth simulation layout.

[0106] Specifically, after the finite element model of the orthodontic appliance is worn on the finite element model of the dental arch, the shapes of both models will change, thus generating interaction forces, that is, the finite element model of the orthodontic appliance exerts an orthodontic force on the finite element model of the dental arch, and correspondingly, the finite element model of the dental arch exerts a resistance force on the finite element model of the orthodontic appliance. These two forces cause changes in the shapes and / or positions of different regions of the two models, thus achieving mechanical equilibrium in different regions. The deformation on the finite element model of the dental arch generates stress, which is used as the resistance force to balance the orthodontic force. Generally, it is considered that the shape of teeth does not change during orthodontic treatment, while the periodontal tissue is prone to deformation during orthodontic treatment, and the deformation of the periodontal tissue is an important factor leading to tooth movement in the dental arch. Based on this, the present invention calculates the deformation on the two models through finite element simulation iteration until the orthodontic force provided by the finite element model of the orthodontic appliance and the resistance force generated by the deformation of the periodontal tissue represented by the finite element model of the dental arch reach a mechanical equilibrium state. When in the mechanical equilibrium state, the finite element model of teeth in the finite element model of the dental arch represents the tooth movement in the patient's dental arch, that is, the orthodontic change of teeth in the current simulation.

[0107] It can be seen that based on the fact that the periodontal tissue is prone to deformation during tooth orthodontic treatment in this embodiment, the deformation of the periodontal tissue is used as the main basis for evaluating the tooth orthodontic effect. When the orthodontic force provided by the finite element model of the orthodontic appliance and the resistance force generated by the deformation of the periodontal tissue in the finite element model of the dental arch reach a mechanical equilibrium in finite element analysis, the orthodontic state of the finite element model of teeth in the finite element model of the dental arch is used as the tooth simulation orthodontic state, and the orthodontic result of the orthodontic appliance is determined according to the deviation from the target design layout, so as to determine whether the orthodontic result of the current orthodontic appliance meets the expectation, and to guide whether to redesign the orthodontic plan to improve the orthodontic efficiency.

[0108] Step S305, evaluate the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result.

[0109] Based on step S304, the tooth simulation layout reached by the finite element model of the dental arch after finite element simulation can be obtained, or the stress distribution data of the finite element model of the alveolar bone when the finite element model of teeth in the finite element model of the dental arch reaches the target design layout. Therefore, the orthodontic effect of the digital model of the orthodontic appliance can be evaluated respectively based on these simulation results.

[0110] In some embodiments, the evaluating the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result includes:

[0111] Compare the simulated tooth layout obtained after finite element simulation of the dental finite element model with the tooth arrangement represented by the current first digital target dental model, where the tooth arrangement represented by the current first digital target dental model is the target design layout of the dental finite element model;

[0112] If the deviation between the two is less than a preset value, it is determined that the orthodontic effect of the orthodontic appliance digital model meets the orthodontic indicators; otherwise, it is determined that the orthodontic effect of the orthodontic appliance digital model does not meet the orthodontic indicators.

[0113] For the calculation of the deviation between the simulated tooth layout and the target design layout, in some preferred embodiments, the position deviations (including distance deviation and angle deviation) of the corresponding teeth in the simulated tooth layout and the target design layout can be calculated respectively. When the position deviation in each tooth is less than the corresponding threshold, it is considered that the orthodontic effect of the orthodontic appliance digital model meets the orthodontic indicators. When the position deviation of a certain tooth is greater than the corresponding threshold, it is determined that the orthodontic effect of the orthodontic appliance digital model does not meet the orthodontic indicators; for a patient's dentition, generally there are multiple teeth designed to move, that is, teeth to be moved. Generally, the position deviation between the teeth that are not designed to move is very small and generally does not exceed the threshold. Therefore, in some other preferred embodiments, only the position deviations of the teeth to be moved designed in the simulated tooth layout and the target design layout need to be calculated. When the position deviation of each tooth to be moved is less than the corresponding threshold, it is considered that the orthodontic effect of the orthodontic appliance digital model meets the orthodontic indicators. When the position deviation of a certain tooth to be moved is greater than the corresponding threshold, it is determined that the orthodontic effect of the orthodontic appliance digital model does not meet the orthodontic indicators; of course, in addition, for the movement of a patient's dentition, there will be some key teeth among the teeth to be moved that have a greater impact on the overall movement of the teeth. Here, they can be called characteristic teeth. Therefore, in some preferred embodiments, it can also be determined whether the orthodontic indicators are met by the position deviation between the characteristic teeth in the simulated tooth layout and the target design layout, that is, calculate the position deviation (including distance deviation and angle deviation) of the characteristic teeth predetermined in the simulated tooth layout and the target design layout. When the position deviation of each characteristic tooth is less than the corresponding threshold, it is considered that the orthodontic effect of the orthodontic appliance digital model meets the orthodontic indicators. When the position deviation of a certain characteristic tooth is greater than the corresponding threshold, it is determined that the orthodontic effect of the orthodontic appliance digital model does not meet the orthodontic indicators, where the characteristic teeth can be predetermined by the doctor according to clinical experience.

[0114] It can be seen that in this embodiment, by calculating the deviation between the simulated tooth layout and the target design layout, it is determined whether the orthodontic result of the current orthodontic appliance meets the expectation, thereby guiding whether to redesign the orthodontic plan and improving the orthodontic efficiency of the orthodontic appliances in each orthodontic step of the final design plan.

[0115] In some other embodiments, evaluating the orthodontic effect of the orthodontic appliance digital model according to the simulation results includes:

[0116] Obtaining the stress distribution data of the alveolar bone finite element model when the tooth finite element model in the dental arch finite element model reaches the target design layout, where the target design layout is the dentition layout represented by the current first digital target dental arch model;

[0117] When the stress distribution data of the alveolar bone finite element model reaches the alveolar bone remodeling threshold, it is determined that the orthodontic effect of the orthodontic appliance digital model meets the correction index; otherwise, it is determined that the orthodontic effect of the orthodontic appliance digital model does not meet the correction index.

[0118] In this embodiment, based on the comparison result between the stress distribution data of the alveolar bone finite element model and the alveolar bone remodeling threshold when the tooth finite element model in the finite element simulation reaches the target design layout, it is determined whether the orthodontic result of the current orthodontic appliance meets the expectation, so that wearing the orthodontic appliance designed for the patient's dental arch will cause alveolar bone remodeling, making the design of the orthodontic appliance more accurate, scientific and reasonable, and improving the orthodontic efficiency.

[0119] In the present invention, when the orthodontic effect of the orthodontic appliance digital model meets the correction index, continue to perform the wearing simulation of the orthodontic appliance based on the combination of the next orthodontic appliance digital model and the previous first digital target dental arch model corresponding to the current first digital target dental arch model until the wearing simulation result based on the orthodontic appliance digital model representing the second dentition layout meets the corresponding correction index; otherwise, enter step S4 to perform the next round of orthodontic treatment plan design.

[0120] Step S4: Obtain the previous first digital target dental arch model of the current first digital target dental arch model as the first dental arch digital model, and adjust the correction parameters, then return to step S2.

[0121] As described above, the correction parameters include one or more of the single-step movement amounts of different movement modes of each tooth in the patient's dentition between the first layout and the second layout, where the different movement modes of the tooth include overall movement, rotation, torque, uprighting, extrusion and intrusion movement modes.

[0122] That is to say, when it is determined through finite element simulation that the orthodontic effect of a digital model of an orthodontic appliance in the current round of orthodontic treatment plan design does not meet the correction index, it means that the orthodontic appliance in the current orthodontic step of the current round of orthodontic treatment plan design does not meet the design requirements. Then, it is necessary to obtain the target design layout of the previous orthodontic step of the current orthodontic step, and then restart the design of the next round of orthodontic treatment plan using the interpolation method with this target design layout and the second layout. When restarting the design of the next round of orthodontic treatment plan with the target design layout of the previous orthodontic step and the second layout, if no correction parameters are changed, the first digital target dental models obtained by using the interpolation method are largely the same as the first digital target dental models in the previous round of orthodontic treatment plan design. Conducting finite element simulation analysis of orthodontic appliance wearing based on this, the result will still not change. Therefore, it is necessary to adjust the correction parameters to change the dental orthodontic states represented by the first digital target dental models obtained in the next round of orthodontic treatment plan design. In some embodiments, one or more of the single-step movement amounts corresponding to each movement mode of any tooth can be adjusted, such as a single parameter or a combination of multiple of them, so as to change the dental orthodontic states represented by the first digital target dental models obtained in the next round of orthodontic treatment plan design.

[0123] Generally speaking, patients who need orthodontic treatment often have multiple teeth to be moved. Among the multiple teeth to be moved, there is often a tooth that has a relatively important impact on the orthodontic effect. Such a tooth is called a characteristic tooth in the present invention. The change of the correction parameters corresponding to the characteristic tooth has a greater impact on the redesign of the orthodontic treatment plan. Therefore, in some preferred embodiments, before adjusting the correction parameters, the characteristic teeth in the patient's dental arch can be determined first, and then at least one of the correction parameters of the characteristic teeth can be selected for adjustment, so as to change the dental orthodontic states represented by the first digital target dental models obtained in the next round of orthodontic treatment plan design through the change of the correction parameters of the characteristic teeth. Among them, the determination of the characteristic teeth can be pre-determined by a doctor or a designer based on clinical experience.

[0124] In fact, during the orthodontic treatment of teeth, for each tooth, the difficulty of achieving orthodontics with different movement modes is different. Generally speaking, the movement mode with greater difficulty has a greater impact on the orthodontic effect. Therefore, in order to further improve the orthodontic effect, in some other preferred embodiments, according to the pre-determined orthodontic difficulty of each tooth, the movement mode with relatively greater orthodontic difficulty among each tooth can be selected as the first movement mode. In this way, when adjusting the correction parameters, at least one tooth to be moved can be selected, and the correction parameters corresponding to the first movement mode of the at least one tooth to be moved can be adjusted. Preferably, the at least one tooth to be moved can also be a characteristic tooth.

[0125] The difficulty level of orthodontics can be determined based on the expression rates of various movement methods. For example, for tooth No. 13, its six movement methods (overall movement, rotation, torque, uprighting, extrusion, and intrusion movement methods), assuming their respective expression rates are 97%, 93%, 86%, 95%, 98%, and 96%, then the movement method of overall movement of this tooth is considered the first movement method of tooth No. 13.

[0126] In some embodiments, the expression rate can be statistically obtained through one or a combination of the following information: clinical data, literature research data, and simulation result data of finite element model simulating long-term tooth movement.

[0127] Among them, clinical data can more widely reflect the actual situation of tooth orthodontics, making the orthodontic weight coefficient more suitable for the clinical treatment of patients; literature research data can more prominently reflect orthodontic characteristics, making the orthodontic weight coefficient more scientific and reasonable; simulation result data of finite element model simulating long-term tooth movement does not require data collection and is more convenient to implement.

[0128] In this way, statistically obtaining the expression rate through various methods is beneficial to providing accurate and objective data, and then determining an accurate and objective orthodontic weight coefficient.

[0129] Step S5: Obtain all first digital target dental arch models that meet the correction indicators as a series of digital target dental arch models for the final design scheme, and the series of digital target dental arch models are used to gradually move the patient's teeth from the first dental arch layout to the second dental arch layout.

[0130] It can be seen that each round of re-design of the orthodontic scheme is carried out with the dental arch layout represented by the last first digital target dental arch model that meets the correction indicators in the previous round of orthodontic scheme design and the second layout. In this way, through multiple rounds of cyclic design of the orthodontic scheme, a series of digital target dental arch models can be obtained, and this series of digital target dental arch models represent the tooth orthodontic states of each orthodontic step in the final design scheme for gradually moving the patient's teeth from the first dental arch layout to the second dental arch layout.

[0131] It can be seen that the present invention examines the orthodontic effect of each dental orthodontic appliance in the orthodontic scheme designed with the first layout and the second layout. When the orthodontic result of the dental orthodontic appliance in a certain orthodontic step is not ideal, the orthodontic scheme is re-designed with the target expected layout of the previous orthodontic step and the second layout, and the orthodontic effect of each dental orthodontic appliance in the re-designed orthodontic scheme is examined. The orthodontic scheme is designed cyclically in turn, so that the orthodontic results of each dental orthodontic appliance in the finally obtained orthodontic scheme meet the expected effects, and there will be no problem that the subsequent orthodontic appliance cannot be worn or is uncomfortable to wear due to the deviation between the actual wearing result and the expected result, improving the orthodontic efficiency of the patient's teeth.

[0132] See Figure 4 Figure 4 , another embodiment of the present invention further provides a design device for a dental orthodontic system, including a dental arch layout acquisition module 401, an orthodontic treatment plan iterative design module 402, a simulation verification module 403, an adjustment module 404, and an orthodontic treatment plan generation module 405.

[0133] Among them, the dental arch layout acquisition module 401 is configured to obtain a first dental arch digital model and a second dental arch layout, where the first dental arch digital model represents the first dental arch layout of the patient's dentition. Among them, the first layout may be the initial dental arch layout when the patient starts orthodontic treatment, also known as the original dental arch layout, or it may be an intermediate dental arch layout after a period of orthodontic treatment.

[0134] The orthodontic treatment plan iterative design module 402 is configured to obtain a series of first digital target dental arch digital models based on the first dental arch digital model, the second dental arch layout, and correction parameters by using the interpolation method. The series of first digital target dental arch models correspond to a series of tooth orthodontic states that gradually move the patient's dentition from the dental arch layout represented by the first dental arch digital model to the second dental arch layout.

[0135] The simulation verification module 403 is configured to sequentially obtain the orthodontic appliance digital models corresponding to each of the first digital target dental arch models, and based on the combination of the orthodontic appliance digital model and the previous first digital target dental arch model of the current first digital target dental arch model, simulate the wearing process of the orthodontic appliance to verify the orthodontic effect of the orthodontic appliance digital model. If the orthodontic effect of the orthodontic appliance digital model meets the correction index, return to the current simulation verification module 403, and continue to perform the wearing simulation of the orthodontic appliance based on the combination of the next orthodontic appliance digital model and the previous first digital target dental arch model of the corresponding current first digital target dental arch model until the wearing simulation result based on the orthodontic appliance digital model representing the second dental arch layout meets the corresponding correction index, and enter the orthodontic treatment plan generation module 405. Among them, the first dental arch digital model serves as the previous first digital target dental arch model of the first orthodontic appliance digital model; otherwise, the adjustment module 404 is activated.

[0136] In this embodiment, the simulation verification module 403 mainly determines the orthodontic effect of the orthodontic appliance finite element model by obtaining the orthodontic appliance finite element model of the orthodontic appliance digital model and the dental arch finite element model of the previous first digital target dental arch model of the current first digital target dental arch model, wearing the orthodontic appliance finite element model on the dental arch finite element model for finite element simulation analysis, and based on the finite element analysis results.

[0137] An adjustment module 404 is configured to obtain a previous first digital target dental arch model of the current first digital target dental arch model as the first dental arch digital model, adjust the correction parameters, and return to the orthodontic treatment plan loop design module 402.

[0138] An orthodontic treatment plan generation module 405 is configured to obtain all first digital target dental arch models that meet the correction criteria as a series of digital target dental arch models of the final design plan, and the series of digital target dental arch models are used to gradually move the patient's teeth from the first tooth arrangement to the second tooth arrangement.

[0139] Another embodiment of the present invention further provides a manufacturing method of a dental orthodontic system. The manufacturing method uses a series of digital target dental arch models obtained according to any of the above design methods, and then uses a thermoforming process or an additive manufacturing process to produce a series of dental orthodontic appliances. The series of dental orthodontic appliances are used to gradually move the patient's teeth from the first tooth arrangement to the second tooth arrangement.

[0140] For example, when using the thermoforming process for production, the specific production method includes: 3D printing the series of digital target dental arch models to produce a solid dental arch model, and then obtaining a shell-shaped dental appliance including the tooth shape by thermoforming on the solid dental arch model, and then cutting along the gum line or adjacent to the gum line on the shell-shaped dental appliance including the tooth shape to obtain a shell-shaped tooth orthodontic appliance that can accommodate the teeth.

[0141] For example, when using the additive manufacturing process for production, the specific manufacturing process is to use 3D printing to print and produce a series of corresponding orthodontic appliance digital models obtained based on the series of digital target dental arch models to obtain a series of dental orthodontic appliances.

[0142] Another embodiment of the present invention also relates to an electronic device, as Figure 5 shown, including at least one processor 501; and a memory 502 communicatively connected to the at least one processor 501; wherein, the memory 502 stores instructions executable by the at least one processor 501, and the instructions are executed by the at least one processor 501 to enable the at least one processor 501 to execute the above-mentioned design method of the dental orthodontic system or execute the above-mentioned manufacturing method of the dental orthodontic system.

[0143] Among them, the memory 502 and the processor 501 are connected in a bus manner. The bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors 501 and the memory 502 together. The bus can also connect various other circuits together, such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art. Therefore, they will not be further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, and provides a unit for communicating with various other devices on the transmission medium. The data processed by the processor is transmitted on the wireless medium through the antenna. Further, the antenna also receives data and transmits the data to the processor 501.

[0144] The processor 501 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory 502 can be used to store data used by the processor when executing operations.

[0145] An embodiment of the present invention relates to a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the above method embodiment is implemented.

[0146] That is, those skilled in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by a program instructing relevant hardware. The program is stored in a storage medium, including several instructions for causing a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0147] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present application, and in practical applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A design method for a dental orthodontic system, characterized in that, Including the following steps: Step S1, obtaining a first dental digital model and a second dental arch layout, where the first dental digital model represents the first dental arch layout of the patient's dentition; Step S2, based on the first dental digital model, the second dental arch layout, and the correction parameters, using interpolation to obtain a series of first digital target dental models, where the series of first digital target dental models correspond to a series of tooth correction states for gradually moving the patient's dentition from the dental arch layout represented by the first dental digital model to the second dental arch layout; Step S3, sequentially obtaining the digital models of the orthodontic appliances corresponding to each of the first digital target dental models, based on the combination of the digital model of the orthodontic appliance and the previous first digital target dental model of the current first digital target dental model, simulating the wearing process of the orthodontic appliance to test the orthodontic effect of the digital model of the orthodontic appliance. If the orthodontic effect of the digital model of the orthodontic appliance meets the correction criteria, return to Step S3, and continue to simulate the wearing of the orthodontic appliance based on the combination of the next digital model of the orthodontic appliance and the previous first digital target dental model corresponding to the current first digital target dental model until the simulation result of wearing the digital model of the orthodontic appliance representing the second dental arch layout meets the corresponding correction criteria, and enter Step S5, where the first dental digital model serves as the previous first digital target dental model of the first digital model of the orthodontic appliance; otherwise, enter Step S4; Step S4, obtaining the previous first digital target dental model of the current first digital target dental model as the first dental digital model, adjusting the correction parameters, and returning to Step S2; Step S5, obtaining all the first digital target dental models that meet the correction criteria as a series of digital target dental models of the final design plan, where the series of digital target dental models are used to gradually move the patient's teeth from the first dental arch layout to the second dental arch layout.

2. The design method of the dental orthodontic system according to claim 1, characterized in that The step of simulating the wearing process of the orthodontic appliance based on the combination of the digital model of the orthodontic appliance and the previous first digital target dental model of the current first digital target dental model to test the orthodontic effect of the digital model of the orthodontic appliance includes: Obtaining the finite element model of the dental arch of the previous first digital target dental model of the current first digital target dental model and the finite element model of the orthodontic appliance corresponding to the digital model of the orthodontic appliance, where the finite element model of the dental arch at least includes a finite element model of teeth, a finite element model of alveolar bone, and a finite element model of periodontal ligament; Wearing the finite element model of the orthodontic appliance on the finite element model of the dental arch for finite element simulation of the wearing of the orthodontic appliance; Based on the finite element simulation, obtaining a simulation result including at least one of the following: the simulated tooth layout reached by the finite element model of the dental arch after finite element simulation and the stress distribution data of the finite element model of the alveolar bone in the finite element model of the dental arch; Evaluating the orthodontic effect of the digital model of the orthodontic appliance according to the simulation result.

3. The design method of the dental orthodontic system according to claim 2, characterized in that, The step of wearing the finite element model of the orthodontic appliance on the finite element model of the dental arch for finite element simulation of the wearing of the orthodontic appliance includes: Constrain the degrees of freedom of the tooth finite element model in the dental arch finite element model; Wear the appliance finite element model on the dental arch finite element model and apply a load; After establishing contact, remove the load and release all contact constraints on the appliance to obtain the finite element model of the appliance worn on the dental arch; Release the constraint on the degrees of freedom of the tooth finite element model to perform finite element analysis on the movement of the teeth.

4. The design method of the dental orthodontic system according to claim 3, wherein In the step of constraining the degrees of freedom of the tooth finite element model in the dental arch finite element model, restrict the relative degrees of freedom of the contact surface between the periodontal membrane finite element model and the tooth finite element model in the dental arch finite element model, and / or restrict the relative degrees of freedom of the contact surface between the periodontal membrane finite element model and the alveolar bone finite element model in the dental arch finite element model.

5. The method for designing a dental correction system according to claim 3, wherein: The simulated tooth layout of the dental arch finite element model after finite element simulation is obtained by the following method: Wear the appliance finite element model on the dental arch finite element model to interact, obtain the interaction force between the two, and when the change in the interaction force is less than the set threshold, the tooth arrangement represented by the dental arch finite element model is the simulated tooth layout.

6. The design method of the dental orthodontic system according to claim 3, characterized in that, The simulated tooth layout of the dental arch finite element model after finite element simulation is obtained by the following method: Obtain that when the orthodontic force provided by the appliance finite element model reaches mechanical equilibrium with the resistance force generated by the deformation of the periodontal tissue in the dental arch finite element model, the tooth arrangement represented by the dental arch finite element model is the simulated tooth layout.

7. The design method of the dental orthodontic system according to claim 5 or 6, characterized in that, Evaluating the orthodontic effect of the appliance digital model according to the simulation results includes: Compare the simulated tooth layout of the dental arch finite element model after finite element simulation with the tooth arrangement represented by the current first digital target dental arch model, and the tooth arrangement represented by the current first digital target dental arch model is the target design layout of the dental arch finite element model; If the deviation between the two is less than the preset threshold, it is determined that the orthodontic effect of the appliance digital model meets the orthodontic index; otherwise, it is determined that the orthodontic effect of the appliance digital model does not meet the orthodontic index.

8. The design method of the dental orthodontic system according to claim 7, characterized in that, Evaluating the orthodontic effect of the appliance digital model according to the simulation results includes: Calculate the position deviation of the corresponding teeth to be moved between the simulated tooth layout and the target design layout; If the position deviation of a certain tooth to be moved is greater than the corresponding preset threshold, it is determined that the orthodontic effect of the appliance digital model does not meet the orthodontic index.

9. The design method of the dental orthodontic system according to claim 7, characterized in that, Evaluating the orthodontic effect of the appliance digital model according to the simulation results includes: Determine the characteristic teeth in the patient's dental arch; Calculate the position deviation of the corresponding characteristic teeth between the simulated tooth layout and the target design layout; If the position deviation of a certain characteristic tooth is greater than the corresponding preset threshold, it is determined that the orthodontic effect of the appliance digital model does not meet the orthodontic index.

10. The design method of the dental orthodontic system according to claim 2, characterized in that, Evaluating the orthodontic effect of the appliance digital model according to the simulation results includes: When obtaining the stress distribution data of the alveolar bone finite element model when the tooth finite element model in the dental arch finite element model reaches the target design layout, the target design layout is the dental arch layout represented by the current first digital target dental arch model; When the stress distribution data of the alveolar bone finite element model reaches the alveolar bone remodeling threshold, it is determined that the orthodontic effect of the orthodontic appliance digital model meets the correction index, otherwise, it is determined that the orthodontic effect of the orthodontic appliance digital model does not meet the correction index.

11. The design method of the dental orthodontic system according to claim 10, characterized in that, The obtaining of the stress distribution data of the alveolar bone finite element model when the tooth finite element model in the dental arch finite element model reaches the target design layout includes: Selecting the boundary conditions of the dental arch finite element model by using the orthodontic appliance finite element model, and the boundary conditions of the dental arch finite element model include the pose change and / or the load received by the dental arch finite element model; Using the dental arch finite element model and the corresponding boundary conditions to obtain a second dental arch finite element model and performing nonlinear finite element calculation to obtain the stress distribution data of the alveolar bone finite element model.

12. The design method of the dental orthodontic system according to claim 10, wherein The alveolar bone remodeling threshold is the critical stress value that triggers alveolar bone remodeling.

13. The design method of the dental orthodontic system according to any one of claims 1-6 and 8-12, characterized in that, The correction parameters include one or more of the single-step movement amounts of different movement modes of each tooth in the patient's dental arch, and the different movement modes of each tooth include one or more of the movement modes of overall movement, rotation, torque, uprighting, elongation, and intrusion of the tooth.

14. The design method of the dental orthodontic system according to claim 13, characterized in that, The adjusting of the correction parameters includes: Determining the characteristic teeth in the patient's dental arch; Adjusting at least one correction parameter in the characteristic teeth.

15. The design method of the dental orthodontic system according to claim 13, characterized in that, The adjusting of the correction parameters includes: Determining the first movement mode of each tooth in the patient's dental arch, and the first movement mode is obtained based on the expression rate of each tooth position tooth in each of the movement modes; Adjusting the correction parameter corresponding to the first movement mode of at least one tooth to be moved.

16. The design method of the dental orthodontic system according to claim 15, characterized in that, The tooth to be moved is the characteristic tooth in the patient's dental arch determined in advance.

17. A design device for a dental orthodontic system, characterized in that, Including: A dental arch layout obtaining module, configured to obtain a first dental arch digital model and a second dental arch layout, and the first dental arch digital model represents the first dental arch layout of the patient's dental arch; An orthodontic treatment plan cyclic design module, configured to obtain a series of first digital target dental arch models by using the interpolation method based on the first dental arch digital model, the second dental arch layout, and the correction parameters, and the series of first digital target dental arch models correspond to a series of tooth orthodontic states that gradually move the patient's dental arch from the dental arch layout represented by the first dental arch digital model to the second dental arch layout; The simulation verification module is used to sequentially obtain the digital models of the orthodontic appliances corresponding to each of the first digital target dental arch models, and based on the combination of the digital model of the orthodontic appliance and the previous first digital target dental arch model of the current first digital target dental arch model, simulate the wearing process of the orthodontic appliance to verify the orthodontic effect of the digital model of the orthodontic appliance. If the orthodontic effect of the digital model of the orthodontic appliance meets the correction index, return to the current simulation verification module, and continue to simulate the wearing of the orthodontic appliance based on the combination of the next digital model of the orthodontic appliance and the previous first digital target dental arch model corresponding to the current first digital target dental arch model until the wearing simulation result based on the digital model of the orthodontic appliance representing the second dental arch layout meets the corresponding correction index, and enter the orthodontic treatment plan generation module, where the first dental arch digital model serves as the previous first digital target dental arch model of the first orthodontic appliance digital model; otherwise, start the adjustment module; The adjustment module is used to obtain the previous first digital target dental arch model of the current first digital target dental arch model as the first dental arch digital model, adjust the correction parameters, and return to the orthodontic treatment plan loop design module; The orthodontic treatment plan generation module is used to obtain all the first digital target dental arch models that meet the correction index as a series of digital target dental arch models of the final design plan, and the series of digital target dental arch models are used to gradually move the patient's teeth from the first dental arch layout to the second dental arch layout.

18. A manufacturing method of a dental orthodontic system, characterized in that, It includes the following steps: Obtain a series of digital target dental arch models based on the design method described in any one of claims 1-16; Manufacture the male mold of the orthodontic appliance according to the digital target dental arch model; Use the hot-press film forming or additive manufacturing process to produce a series of shell-shaped dental appliances, and the series of shell-shaped dental appliances are used to gradually move the patient's teeth from the first dental arch layout to the second dental arch layout.

19. An electronic device, wherein, It includes: At least one processor; And a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the design method of the dental orthodontic system described in any one of claims 1 to 16 or the manufacturing method of the dental orthodontic system described in claim 18.

20. A computer-readable storage medium stores a computer program, wherein, When the computer program is executed by the processor, it implements the design method of the dental orthodontic system described in any one of claims 1 to 16 or the manufacturing method of the dental orthodontic system described in claim 18.

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