Method for generating target tooth arrangement, and electronic device

Abstract

Provided are a method for generating a target tooth arrangement and an electronic device. The method comprises: acquiring an initial tooth arrangement to be orthodontically treated and status of gingival tissue, thereby generating a three-dimensional digital dental jaw model corresponding to the initial tooth arrangement (101); on the basis of the three-dimensional digital dental jaw model (102), determining a WALA ridge-based spatial orthodontic reference curve; and on the basis of the spatial orthodontic reference curve, adjusting the pose of each tooth in the three-dimensional space in the three-dimensional digital dental jaw model to generate a target three-dimensional digital dental jaw model (103), adjusting the center of resistance of the tooth to be at the same height with the corresponding position on the spatial orthodontic reference curve, and adjusting the horizontal distance between the FA point of the tooth and the corresponding position on the spatial orthodontic reference curve to be within a preset range. The accuracy of acquiring a target tooth arrangement can be improved, so as to achieve a target tooth arrangement that better meets the oral physiological conditions of a patient.

Description

Method and electronic device for generating target tooth arrangement CROSS-REFERENCE

[0001] This application is related to the Chinese Patent Application No. 2024113924783 entitled “Method and electronic device for generating target tooth arrangement” filed on September 30, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of orthodontic digital design, and in particular, to a method and electronic device for generating a target tooth arrangement. BACKGROUND

[0003] A shell-shaped tooth aligner is a kind of orthodontic treatment device, which is made of safe, elastic and transparent high molecular material. It has the advantages of full invisibility in the correction process, good appearance, simple operation, easy oral cleaning, etc. Moreover, due to its transparent and aesthetic characteristics, the correction process is almost completed without being noticed by others, and it has gradually become the first choice for orthodontic patients.

[0004] With the rapid development of computer technology, computer technology is increasingly used in dental diagnosis and treatment. For example, in orthodontic treatment using a shell-shaped tooth aligner, an initial arch curve is usually generated based on a three-dimensional digital model representing a dental arch in an initial tooth arrangement, the initial arch curve is adjusted to an ideal state, and the initial tooth arrangement is adjusted based on the arch curve in the ideal state, thereby obtaining a three-dimensional digital model representing the dental arch in a target tooth arrangement. However, it is found in actual application that the accuracy of the target tooth arrangement generated in this way mainly depends on the accuracy of the arch curve, and the accuracy of the arch curve in the ideal state depends on the accuracy of the initial arch curve. If the initial tooth arrangement is relatively chaotic, the difference between the obtained arch curve and the ideal state will be larger, and only considering the tooth arrangement without considering other physiological characteristics of the oral cavity may result in a target tooth arrangement that cannot be achieved. A current method is to adjust the generated arch curve according to the physiological characteristics of the oral cavity by a doctor or a professional designer, so as to obtain a target arch curve that is more in line with the physiological characteristics of the oral cavity of the patient and a target tooth arrangement that is more likely to be achieved. However, this method not only increases the manual adjustment process and has low adjustment efficiency, but also the quality of the adjusted arch curve is affected by the experience of the adjuster, thereby affecting the quality of the obtained target tooth arrangement. SUMMARY

[0005] The purpose of the present application is to provide a method and electronic device for generating a target tooth arrangement, which can improve the accuracy of obtaining a target tooth arrangement and obtain a target tooth arrangement that is more in line with the physiological conditions of the oral cavity of the patient.

[0006] To solve the above technical problems, the embodiment of the present application provides a method for generating a target tooth layout, comprising: acquiring an initial tooth layout to be corrected and a state of gingival tissue, thereby generating a three-dimensional dental arch digital model corresponding to the initial tooth layout; determining a spatial correction reference curve based on a WALA ridge (Willl Andrews Larry Andrews ridge Point) based on the three-dimensional dental arch digital model; adjusting the pose of each tooth in the three-dimensional space in the three-dimensional dental arch digital model based on the spatial correction reference curve to generate a target three-dimensional dental arch digital model; wherein it comprises: adjusting the impedance center of the tooth to be the same height as the corresponding position of the spatial correction reference curve, and adjusting the horizontal distance between the FA point (Facial-Axis point) of the tooth and the corresponding position of the spatial correction reference curve to be within a predetermined range.

[0007] Compared with the prior art, the embodiment of the present application utilizes the physiological characteristics of the WALA ridge corresponding to the position of the patient's alveolar bone in the oral cavity as a correction reference for spatial tooth arrangement, which not only facilitates obtaining a more accurate and more patient-specific tooth arrangement target, but also achieves a higher success rate. Moreover, the WALA ridge is not affected by tooth arrangement before and after tooth arrangement, which not only reduces the influence of the initial tooth arrangement on the tooth arrangement target, but also reduces the intermediate error caused by human adjustment of the tooth arrangement reference line, improves the degree of automation of the tooth arrangement process, and makes the automatic tooth arrangement result more accurate.

[0008] For example, based on the three-dimensional dental arch digital model, the spatial correction reference curve based on the WALA ridge is determined, comprising: presetting a local coordinate system of each tooth, which includes a labial-lingual axis and a root-crown axis; the intersection of the cross section composed of the labial-lingual axis and the root-crown axis of a tooth and the gingival part of the three-dimensional dental arch digital model is obtained to obtain an intersection line, and the most convex point on the labial side of the intersection line is selected as the WALA ridge convex point of the tooth; the WALA ridge convex points of the teeth are collected to form the WALA ridge. The present application limits the WALA ridge to be obtained from the intersection line obtained by intersecting the labial-lingual cross section of the gingival part, and the vertex most deviated to the labial side is obtained, and the WALA ridge is confirmed based on a series of the above vertices to realize the accuracy of the WALA ridge confirmation.

[0009] For example, after obtaining the WALA ridge, it comprises: smoothing the WALA ridge.

[0010] For example, the adjusting the impedance center of the tooth to be the same height as the corresponding position of the space orthodontic reference curve comprises: calculating an initial position of the impedance center of the tooth; wherein, if the three-dimensional dental model comprises a tooth root part, the initial position of the impedance center of the tooth is calculated according to the total height of the tooth; if the three-dimensional dental model comprises a tooth root part and an alveolar bone part, the initial position of the impedance center of the tooth is obtained by lowering a predetermined distance from a point on the intersection of the alveolar bone part and the tooth root part, which is mapped to the long axis of the tooth. The application defines the confirmation method of the impedance center, provides a calculation method in the case of having a tooth root or not having a tooth root, and facilitates the determination of the impedance center in different application scenarios.

[0011] For example, the predetermined distance is half the height of the tooth root.

[0012] For example, the adjusting the horizontal distance between the FA point of the tooth and the corresponding position of the space orthodontic reference curve within a preset range comprises: calculating an initial position of the FA point of each tooth; finding the nearest point of the FA point on the space orthodontic reference curve; and moving the tooth based on the FA point of the tooth until the horizontal distance between the tooth and the corresponding nearest point on the space orthodontic reference curve is within the preset range. The application defines the adjustment method of the FA point, so as to realize accurate and realizable tooth adjustment based on the FA point.

[0013] For example, the calculating the initial position of the FA point of each tooth comprises: presetting a local coordinate system of each tooth, which comprises a labial-lingual axis and a root-crown axis; obtaining an intersection line by intersecting a section formed by the labial-lingual axis and the root-crown axis of a tooth with the tooth part of the three-dimensional dental model; and selecting a segment on the intersection line from the gum line on the labial side to the height of the tooth crown as the FACC (Facial Axis of the Clinical Crown) axis line of the tooth; and selecting a midpoint on the FACC axis line as the initial position of the FA point of the tooth. The application defines the confirmation method of the FA point, realizes more accurate extraction of the FA point, and facilitates the accuracy of the reference data in the adjustment.

[0014] For example, the adjusting the horizontal distance between the FA point of the tooth and the corresponding position of the space orthodontic reference curve within a preset range comprises: determining the incisal edge feature point of each tooth based on the three-dimensional dental model; and adjusting the tooth until the incisal edge feature points of all the teeth after the adjustment form a smooth curve. Since the curve formed by the incisal edge feature points is smooth, the alignment of the teeth in the vertical direction can be confirmed, and since the incisal edge feature points of the teeth are aligned, a stable occlusion relationship can be realized. Therefore, the application defines the smooth curve formed by the incisal edge feature points after the adjustment of the teeth, so as to realize that the result of the tooth arrangement based on the FA point can ensure that the upper and lower teeth can be uniformly contacted when occluding, form a good and stable occlusion relationship, and help the force of the teeth to be uniformly distributed when occluding.

[0015] For example, the determination of the incisal edge feature point of each tooth comprises: when the tooth is a molar, the incisal edge feature point is a buccal cusp point; when the tooth is a premolar, the incisal edge feature point is a buccal cusp point or a buccal groove point; when the tooth is an incisor or a canine, the incisal edge feature point is an upper incisal edge point.

[0016] For example, the adjustment of the pose of each tooth in the three-dimensional space of the three-dimensional dental model based on the spatial correction reference curve to generate a target three-dimensional dental model comprises: adjustment of the attitude angle of the tooth; wherein the spatial position of each tooth is adjusted until the attitude angle is the standard attitude angle or within the allowable error of the standard attitude angle; wherein the standard attitude is determined based on a standard dental model; wherein the attitude angle comprises a torque angle, a torsion angle and / or an axial inclination angle of the tooth. Since the standard tooth is not completely vertical and has a certain inclination, the application limits the adjustment of the attitude angle in the arrangement of teeth so as to realize that the inclination degree of the tooth after the arrangement of teeth is more in line with the physiological characteristics of the tooth, so that the adjusted tooth is more in line with the physiological state of the standard tooth.

[0017] For example, the adjustment of the pose of each tooth in the three-dimensional space of the three-dimensional dental model based on the spatial correction reference curve to generate a target three-dimensional dental model comprises: gap detection and collision detection; wherein the length of the dental arch curve is obtained on the jaw plane based on the three-dimensional dental model; the sum of the widths of all teeth is obtained based on the three-dimensional dental model; the position of the tooth in the mesiodistal direction is adjusted according to the relationship between the length of the dental arch curve and the sum of the widths until the gap standard is met.

[0018] Embodiments of the application also provide a method for generating a target tooth arrangement, comprising: obtaining an initial upper jaw tooth arrangement and an initial lower jaw tooth arrangement to be corrected, thereby generating a corresponding three-dimensional upper jaw digital model and a three-dimensional lower jaw digital model; processing the three-dimensional lower jaw digital model based on the above-mentioned method for generating a target tooth arrangement to generate a target three-dimensional lower jaw digital model; obtaining the incisal edge point of each tooth of the lower jaw based on the target three-dimensional lower jaw digital model; collecting the incisal edge points of all teeth of the lower jaw to form a lower jaw incisal edge reference curve; adjusting the three-dimensional upper jaw digital model based on the lower jaw incisal edge reference curve to generate a target three-dimensional upper jaw digital model; which comprises: adjusting the incisal edge point of each tooth of the upper jaw to conform to the incisal edge reference curve.

[0019] The embodiment further applies to the common tooth arrangement of the upper jaw and the lower jaw based on the WALA ridge as the correction reference for the space tooth arrangement technology, arranges the teeth of the lower jaw based on the WALA ridge first, and arranges the teeth of the upper jaw based on the feature relationship between the lower jaw incisal edge point and the upper jaw incisal edge point, so that the tooth arch curve for tooth arrangement is not needed to be obtained separately for the upper jaw, the influence of the initial tooth arrangement of the upper jaw on the tooth arrangement target can be reduced, the intermediate error caused by the human adjustment of the tooth arrangement reference line can be reduced, the degree of automation of the tooth arrangement process is improved, and the automatic tooth arrangement result is more accurate.

[0020] For example, when adjusting the three-dimensional upper jaw digital model based on the lower jaw incisal edge reference curve, the lower jaw incisal edge reference curve is adjusted in the reference plane and the direction perpendicular to the reference plane respectively to obtain the upper jaw incisal edge reference curve of the corresponding upper jaw; the reference plane is a jaw plane or a horizontal plane; and the incisal edge feature position of the three-dimensional upper jaw digital model is adjusted based on the upper jaw incisal edge reference curve. Since the lower jaw incisal edge reference line and the upper jaw incisal edge reference line have a physiological corresponding rule, the upper jaw incisal edge reference curve obtained based on the tooth arrangement of the lower jaw is used to arrange the teeth of the upper jaw directly, without obtaining the tooth arch curve separately, and the influence of the arrangement of the initial teeth of the upper jaw on the arrangement of the teeth is reduced.

[0021] For example, the lower jaw incisal edge reference curve is adjusted in the direction perpendicular to the reference plane, including moving the front tooth area part of the lower jaw incisal edge reference curve downward by a first preset distance; and the lower jaw incisal edge reference curve is adjusted in the direction of the reference plane, including expanding the lower jaw incisal edge reference curve along the buccal side; the buccal side is expanded uniformly by a second preset distance; or the front tooth area is expanded by a third preset distance, and the back tooth area is expanded by a fourth preset distance, and the third preset distance is less than the fourth preset distance. The adjustment method for transforming the lower jaw incisal edge reference curve to the upper jaw incisal edge reference curve is limited, so that the upper jaw incisal edge reference curve can be obtained accurately and realized.

[0022] For example, the three-dimensional upper jaw digital model is adjusted based on the lower jaw incisal edge reference curve, including adjusting the occlusal feature position of the three-dimensional upper jaw digital model based on the lower jaw incisal edge reference curve; and the occlusal feature position includes the lingual incisal edge point of the front tooth area and the central groove point of the back tooth area. Since the accurate matching of the occlusal feature position can make the occlusal relationship after the tooth arrangement more stable, the occlusal feature position needs to be adjusted in the process of adjusting the tooth arrangement of the upper jaw, so that the occlusal relationship of the target tooth arrangement obtained is more stable.

[0023] In addition, the embodiment of the present application also provides an electronic device, comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method for generating a target tooth layout. BRIEF DESCRIPTION OF DRAWINGS

[0024] One or more embodiments are illustrated by way of example in the figures that are part of this document and which illustrate key / representative principles of the embodiments. The embodiments are not limited to the examples given herein. Elements having the same reference numbers designate like elements throughout the specification. The figures do not limit the scope of the embodiments, as the scope of the embodiments is given by the claims.

[0025] Fig. 1 is a flowchart of a method for generating a target tooth layout according to an embodiment of the present application;

[0026] Fig. 2 is a flowchart of a method for generating a WALA ridge in the method for generating a target tooth layout according to an embodiment of the present application;

[0027] Fig. 3 is a schematic diagram of a section line of a section of a labial-lingual axis and an axial axis of a crown of a tooth intersecting a three-dimensional digital model of a tooth according to an embodiment of the present application;

[0028] Fig. 4 is a schematic diagram of a position of a convex point of a WALA ridge according to an embodiment of the present application;

[0029] Fig. 5 is a schematic diagram of a position relationship between an FA point and a WALA ridge according to an embodiment of the present application;

[0030] Fig. 6 is a schematic diagram of another position relationship between an FA point and a WALA ridge according to an embodiment of the present application;

[0031] Fig. 7 is a schematic diagram of an adjustment of a tooth incisal edge feature point according to another embodiment of the present application;

[0032] Fig. 8 is a flowchart of a method for generating a target tooth layout according to another embodiment of the present application;

[0033] Fig. 9 is a schematic diagram of an electronic device according to another embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purposes, technical solutions and advantages of the present application clearer, some embodiments of the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and are not intended to limit the present application.

[0035] In order to make the purposes, technical solutions and advantages of the present application clearer, some embodiments of the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and are not intended to limit the present application.

[0036] In the embodiments of the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, some of the above terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances.

[0037] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] The "anterior tooth region" and "posterior tooth region" mentioned in the various embodiments of the present application are defined according to the classification of teeth in "Introduction to Oral Medicine", 2nd Edition, pp. 36-38, published by Peking University Medical Publishing House, including premolars and molars, which are shown as teeth 4-8 in FDI marking method, and the teeth in the anterior tooth region are shown as teeth 1-3 in FDI marking method. The teeth in the anterior tooth region include central incisors, lateral incisors and canines.

[0039] The "horizontal plane", "coronal plane", "sagittal plane" mentioned in various embodiments of the present application refer to the terms in biomedical anatomy: the horizontal plane, also known as the "transverse plane", is perpendicular to the vertical axis, and the section that divides the human body into upper and lower parts; the coronal plane is a section that divides the human body into front and back parts along the left and right directions; the sagittal plane is a section that divides the human body into left and right parts, and the left and right sections are the sagittal plane, and the left and right equal sections are called the median sagittal plane.

[0040] The present inventors found in the research on digital design of orthodontic treatment that in order to automatically arrange teeth by using computer technology, the dental arch curve is often used as a reference curve for tooth arrangement. However, in practice, the accuracy of this method is not high, and often requires a manual adjustment process. The reason is that on the one hand, the confirmation of the dental arch curve is based on the initial tooth arrangement, and when the initial tooth arrangement is relatively messy, the accuracy of the obtained dental arch curve is low; on the other hand, the accuracy of the dental arch curve is affected by manual experience during manual adjustment, which affects the quality of the obtained target tooth arrangement. In view of the above technical problems, the embodiments of the present application provide a method for generating a target tooth arrangement, which utilizes the physiological characteristics of the WALA ridge corresponding to the position of the patient's alveolar bone in the oral cavity as a treatment reference for spatial tooth arrangement. This method not only facilitates obtaining a more accurate and more patient-specific tooth arrangement target, but also has a higher success rate. In addition, the WALA ridge is not affected by tooth arrangement before and after tooth arrangement, which not only reduces the influence of the initial tooth arrangement on the tooth arrangement target, but also reduces the intermediate error caused by manual adjustment of the tooth arrangement reference line, thereby improving the degree of automation of the tooth arrangement process and making the automatic tooth arrangement result more accurate.

[0041] The implementation details of the method for generating a target tooth arrangement of the present application will be specifically described below. The following implementation details are provided for convenience of understanding only and are not essential for implementing the present solution.

[0042] It should be noted that the method for generating a target tooth arrangement in the embodiment can be implemented by hardware or a combination of computer software and hardware. For hardware implementation, the method for generating a target tooth arrangement can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic devices for implementing the function of the method for generating a target tooth arrangement, or a combination of the above.

[0043] The specific flow of the method for generating a target tooth arrangement provided in an embodiment of the present application can be as shown in FIG. 1, and specifically includes:

[0044] In step 101, an initial tooth arrangement and a state of gingival tissue to be corrected are obtained, thereby generating a three-dimensional dental model corresponding to the initial tooth arrangement.

[0045] The initial tooth arrangement is represented by a dental model, which can be a dental model of an actual case in an initial position, or a dental model of a test case in an initial position. The source of the model is determined according to needs, and is not listed one by one here. In some embodiments, the initial tooth arrangement can be a tooth arrangement before orthodontics, or a current tooth arrangement when the target tooth arrangement needs to be reconfirmed during the orthodontic process.

[0046] In some embodiments, the obtained initial tooth arrangement can be a dental grid model after incisor classification, in which each tooth is an independent model. In some embodiments, the initial tooth arrangement is a single arch, such as a single mandible.

[0047] In some embodiments, the state of the gingival tissue can be represented by a gingival digital model, which can be a generated virtual gingival digital model or an actual gingival digital model obtained by oral scanning, which is not limited here.

[0048] In step 102, a WALA ridge-based spatial correction reference curve is determined based on the three-dimensional dental model.

[0049] As shown in FIG. 2, the method for generating a WALA ridge includes:

[0050] In step 201, a local coordinate system of each tooth is preset, which includes a labial-lingual axis and a root-crown axis.

[0051] In some embodiments, the local coordinate system of a single tooth is generally constructed when the dental model is established, the data can be directly used, the three axes can adopt the crown-root direction, the mesial-distal direction, and the labial-lingual direction, and the coordinate origin of the local coordinate system can adopt the center point (such as the geometric center point, the gravity center point, etc., which will not be listed one by one) of the tooth. Further explanation about the labial-lingual direction, the labial-lingual direction is adopted for the teeth in the anterior region, the buccal-lingual direction is adopted for the teeth in the posterior region, and the labial-lingual direction is the labial-lingual direction passing through the center point of the tooth, and the buccal-lingual direction is the buccal-lingual direction passing through the center point of the tooth.

[0052] Step 202, the intersection of the section composed of the labial-lingual axis and the crown-root axis of a tooth and the gingival part of the three-dimensional dental model is obtained, and the intersection line is obtained.

[0053] In some embodiments, taking Fig. 3 as an example for further illustration, it can be seen that the profile line of the digital model can be obtained after the section intersects with the three-dimensional dental model, and the buccal gingival part a is selected.

[0054] Step 203, the most convex point of the intersection line on the labial side is selected as the WALA ridge convex point of the tooth.

[0055] In some embodiments, the method for confirming the WALA ridge convex point comprises: finding the vertex on the intersection line, which satisfies that the labial value of the vertex is greater than that of the adjacent vertices on both sides. Regarding the labial direction, for the teeth in the anterior region, the labial direction is taken as the labial direction, and for the teeth in the posterior region, the labial direction is taken as the buccal direction. It should be noted that the intersection line can be a curve segment, the end point of the curve segment near the crown is located on the gingival line, and the end point near the bottom is located on the boundary of the bottom surface of the gingival model. The vertices on a curve segment are limited, and the labial value of each vertex can be obtained by traversal calculation, or the calculation can be performed by sampling part of the points. Taking the intersection line a in Fig. 3 as an example, taking the direction from the tooth root to the tooth crown and the direction from the lingual side to the labial side as the positive directions of the two axes of the coordinate system, a series of vertices P on the intersection line a are defined, which are illustrated by Fig. 4, the labial value of the P point (Pj, Pg) is calculated, the labial value of the P point is Pj, and the point Px in the series of vertices P is selected, which satisfies that the labial values of Px-1 (the upper point of Px) and Px+1 (the lower point of Px) are greater than the labial values of Px-1 (the upper point of Px) and Px+1 (the lower point of Px), respectively. That is, Px is the confirmed WALA ridge convex point.

[0056] In some other embodiments, the method for identifying the Wala ridge convex point comprises: on the gingival surface, selecting a series of points as the gingival surface intersection points by the shortest geodesic line between each target gingival line buccal point and the corresponding boundary point, to form the curve point set; and selecting the most convex point among the gingival surface intersection points as the corresponding Wala point of the corresponding tooth. In this embodiment, the shortest geodesic line refers to the shortest distance between the target gingival line buccal point and the corresponding boundary point on the gingival surface, which can be directly obtained by using existing libraries, and thus will not be described herein. After obtaining the shortest geodesic line between the target gingival line buccal point and the corresponding boundary point on the gingival surface, a series of points are uniformly selected on the shortest geodesic line as the gingival surface intersection points.

[0057] As can be seen, the above provides a plurality of embodiments for selecting a vertex between a tooth gingival line buccal point and a corresponding bottom boundary point, collecting the vertices to obtain a curve point set, and selecting the most convex point in the curve point set as the Wala ridge convex point. In actual applications, other ways can also be used to select the most convex point, which will not be listed one by one herein.

[0058] Step 204: collecting the Wala ridge convex points of the teeth and connecting to form the Wala ridge.

[0059] In some embodiments, the Wala ridge convex points of the teeth can be sequentially connected to obtain an initial form of the Wala ridge. In some other embodiments, the Wala ridge convex points can also be fitted into an arch Wala ridge by using a beta curve, a parabola or an elliptical line, etc.

[0060] In one embodiment, after obtaining the initial form of the Wala ridge, the initial form of the Wala ridge can be mapped to the gingival buccal surface to obtain a Wala ridge located on the gingival buccal surface, and then the Wala ridge is used as a spatial correction reference curve.

[0061] In some embodiments, after obtaining the Wala ridge, the method can comprise: smoothing the Wala ridge. For example, a spline interpolation smoothing method or a Gaussian smoothing method can be used, and other smoothing algorithms can also be used in actual applications, which will not be listed one by one herein. It can be understood that the Wala ridge after smoothing is used as a spatial correction reference curve in this embodiment.

[0062] As can be seen, through the above steps 201 to 204, a Wala ridge curve on the buccal surface of the gingival model can be obtained. The curve is a three-dimensional curve, which not only represents the position of the patient's alveolar bone boundary, but also represents the vertical height of the teeth. In addition, the Wala ridge is obtained by the most convex point on the lip side of the corresponding tooth position of the gingival part in the present application, and the Wala ridge is identified based on a series of the above-mentioned vertices, so that the practicability and accuracy of the identification of the Wala ridge are realized.

[0063] At step 103, the position and posture of each tooth in the three-dimensional space in the three-dimensional dental model is adjusted based on the space orthodontic reference curve, to generate a target three-dimensional dental model.

[0064] In some embodiments, when adjusting the position and posture of the teeth in the three-dimensional space, two-dimensional adjustment can be included: (A) adjusting the impedance center of the tooth to the same height as the corresponding position of the space orthodontic reference curve, and (B) adjusting the horizontal distance between the FA point of the tooth and the corresponding position of the space orthodontic reference curve within a preset range.

[0065] Regarding (A) vertical adjustment of the tooth:

[0066] The impedance center of the tooth can be calculated first, and the calculation process includes: in some embodiments, the three-dimensional dental model includes a tooth root part, and the initial position of the impedance center of the tooth is calculated according to the total height of the tooth. In some embodiments, the height of the tooth root part is 1 / 2 of the impedance center.

[0067] In another embodiment, the three-dimensional dental model includes a tooth root part and an alveolar bone part, and the initial position of the impedance center of the tooth is calculated based on the mapping of the intersection of the alveolar bone part and the tooth root part to the tooth long axis, and the initial point is obtained based on the vertices of the intersection, such as taking the average of the vertices of the intersection as the initial point, and the initial point is moved downward by a predetermined distance to obtain the initial position of the impedance center of the tooth. The predetermined distance is half the height of the tooth root. In this embodiment, the distance between the point where the apex of the single digitized tooth model is mapped to the long axis and the point where the intersection of the digitized alveolar bone model and the digitized tooth model grid is mapped to the long axis is based on the point where the fitting plane of the gum line is mapped to the long axis. The position of the impedance center is the position of the digitized tooth root model in the direction of the distance half. Regarding the calculation of the apex, when there is one tooth root, the lowest point of the tooth root can be directly selected, and when there are multiple tooth roots, the average of the lowest points of the multiple tooth roots can be selected.

[0068] The above calculation process exemplarily lists various ways to confirm the impedance center, so that the impedance center can be accurately predicted in the presence of tooth roots and the absence of tooth roots, facilitating accurate determination of the impedance center in different application scenarios. It can be understood that in other embodiments, in addition to the above calculation methods, other ways of calculating the impedance center of the tooth can also be used, which are not listed one by one here.

[0069] In some embodiments, after the impedance center of the tooth is identified, the position and posture of the tooth can be adjusted based on the impedance center of the tooth. The impedance center of the tooth and the corresponding position of the space correction reference curve can be determined by the projection height value in the root crown direction, i.e., the initial position of the tooth impedance center and the nearest point on the space correction reference curve are projected onto the root crown axis of the tooth to obtain respective projection points, and the vertical height of the tooth is adjusted according to the deviation of the projection point height.

[0070] Regarding (B) horizontal adjustment of the tooth:

[0071] The initial position of the FA point of each tooth can be calculated first, and the calculation process in some embodiments includes: presetting a local coordinate system of each tooth, including a labial-lingual axis and a root crown axis; intersecting a section formed by the labial-lingual axis and the root crown axis of a tooth with the tooth part of the three-dimensional dental model to obtain an intersection line; selecting a segment on the intersection line from the gum line to the crown height on the labial side as the FACC axis of the tooth; and selecting the midpoint of the FACC axis as the initial position of the FA point of the tooth. The midpoint of the FACC axis is the center point of the curve segment. This embodiment limits the confirmation method of the FA point, realizes more accurate extraction of the FA point, and facilitates the accuracy of the reference data during adjustment.

[0072] In some embodiments, after the initial position of the FA point is determined, the horizontal distance between the FA point of the tooth and the corresponding position of the space correction reference curve is adjusted, so that the horizontal distance between the adjusted FA point of the tooth and the corresponding nearest point on the space correction reference curve is within a preset range. The initial position of the FA point of each tooth is calculated, the nearest point of the FA point on the space correction reference curve is found, and the tooth is moved based on the FA point until the horizontal distance between the tooth and the corresponding nearest point on the space correction reference curve is within the preset range. The adjustment method of the FA point is limited in this application to realize accurate and realizable adjustment of the tooth based on the FA point. The preset range can be set differently for different teeth, such as using a fixed value as the range, i.e., as shown in FIGS. 5 and 6, the distance between the FA point of the moved tooth and the nearest point on the space correction reference curve in the horizontal direction is a fixed value: 0.1 mm for incisors, 0.3 mm for lateral incisors, 0.6 mm for canines, 0.8 mm for first premolars, 1.3 mm for second premolars, 2.0 mm for first molars, and 2.2 mm for second molars. On the other hand, the upper and lower error ranges can also be set based on the above fixed values, such as setting the upper and lower error to be 10%, so that the preset range can be set accordingly. For example, for incisors, the fixed value is 0.1 mm, and the upper and lower error is 10%, so the corresponding preset range is 0.09 mm-0.11 mm. The same applies to other tooth positions, which are not listed here.

[0073] By adjusting (A) and (B) above, a target three-dimensional dental arch digital model corresponding to the target dental arrangement can be obtained. In some embodiments, the adjusting dimension further includes (C) mesiodistal adjustment:

[0074] The mesiodistal adjustment step includes gap detection and collision detection. The gap detection and collision detection include: obtaining the length of the dental arch curve on the jaw plane based on the three-dimensional dental arch digital model; obtaining the sum of the widths of all teeth based on the three-dimensional dental arch digital model; and adjusting the positions of the teeth in the mesiodistal direction according to the relationship between the length of the dental arch curve and the sum of the widths until the gap standard is met. According to the comparison between the length of the dental arch curve obtained on the jaw plane and the sum of the widths of all teeth, if the comparison result is that the length of the dental arch curve is too large, it is determined that the gap is too large, and if the comparison result is that the sum of the widths of all teeth is too large, there may be crowding or even collision, so the positions of the teeth in the mesiodistal direction that are too close to each other need to be adjusted. In practical applications, the gap standard can be set to 0.05 mm.

[0075] It can be understood that after automatic tooth arrangement, in order to verify the rationality of the tooth arrangement, it is necessary to verify that the target positions of the excluded teeth do not collide with each other, or the gap between the adjacent two teeth is not too large, so that when the irrationality is detected, the positions of the teeth in the mesiodistal direction are fine-tuned, so that the target dental arrangement obtained is more reasonable in the three-dimensional space.

[0076] It can be seen that, compared with the prior art, the physiological characteristics of the WALA ridge corresponding to the position of the alveolar bone in the oral cavity are used as a reference for space tooth arrangement for correction. Not only is it convenient to obtain a more accurate and more patient-specific tooth arrangement target, but also the success rate is higher. Since the WALA ridge is not affected by tooth arrangement before and after tooth arrangement, not only is the influence of the initial tooth arrangement on the tooth arrangement target reduced, but also the intermediate error caused by human adjustment of the tooth arrangement reference line is reduced, the degree of automation of the tooth arrangement process is improved, and the accuracy of the automatic tooth arrangement result is improved.

[0077] Another embodiment of the present application provides a method for generating a target tooth arrangement. Compared with the previous embodiment, the main improvement of the present embodiment is that the adjustment of the incisal edge feature points of the teeth is increased, so that the adjusted target tooth arrangement has a more stable occlusion relationship.

[0078] As shown in FIG. 7, in some embodiments, the process of adjusting the position and posture of the teeth further includes:

[0079] Step 701, determining the incisal edge feature points of each tooth based on the three-dimensional dental arch digital model.

[0080] In some embodiments, when the tooth is a molar, the incisal feature point is a buccal cusp point; when the tooth is a premolar, the incisal feature point is a buccal cusp point or a buccal groove point; and when the tooth is an incisor or a canine, the incisal feature point is an upper incisal edge point.

[0081] At step 702, the teeth are adjusted until the incisal feature points of all the teeth after adjustment form a smooth curve.

[0082] In this embodiment, since the curve formed by the incisal feature points is smooth, the alignment of the teeth can be confirmed in the vertical direction, and since the incisal feature points of the teeth are aligned, a stable occlusion relationship can be achieved. Therefore, the present application limits the curve formed by the incisal feature points after adjustment of the teeth to be smooth, so as to achieve a result based on the FA point arrangement that can ensure that the upper and lower teeth can be in uniform contact when occluded, forming a good stable occlusion relationship, which helps to evenly distribute the force on the teeth when occluded.

[0083] Another embodiment of the present application provides a method for generating a target tooth arrangement. This embodiment is further improved on the basis of the previous embodiment, and the main improvement is that the adjustment of the posture angle of the teeth is added, so that the target tooth arrangement after adjustment is more in line with the physiological state of the standard teeth.

[0084] In some embodiments, adjusting the posture angle of the teeth includes adjusting the spatial position of each tooth until the posture angle is the standard posture angle or within an allowable error of the standard posture angle; wherein the standard posture is determined based on a standard dental arch model. It can be seen that by assigning the standard posture angle of each tooth in the standard dental arch model to the tooth to be adjusted, it is a simple and effective adjustment method to determine the ideal posture angle of each tooth after adjustment.

[0085] In some embodiments, the posture angle of each tooth is first set to a standard value, and then optimized adjustment is performed on the basis of the standard value of the posture angle of each tooth, so as to obtain a more smooth occlusion side of the target tooth arrangement. It can be seen that fine-tuning on the basis of the standard value of the posture angle of each tooth can take into account the rationality of other feature positions, so that the occlusion side is smoother.

[0086] It should be noted that the posture angle includes the roll angle, the twist angle and / or the axial inclination angle of the tooth.

[0087] It can be seen that since the standard teeth are not completely vertical but have a certain inclination, the present application limits the adjustment of the posture angle in the tooth arrangement, so as to achieve an inclination degree of the teeth after tooth arrangement that is more in line with the physiological characteristics of the teeth, so that the adjusted teeth are more in line with the physiological state of the standard teeth.

[0088] It is worth mentioning that the above embodiments are mainly used to generate the target tooth arrangement of a single jaw, and in actual applications, the target tooth arrangement of the upper jaw or the lower jaw of a patient may need to be adjusted at the same time, so the double-jaw tooth arrangement will be further described.

[0089] Another embodiment of the present application provides a method for generating a target tooth arrangement, as shown in FIG. 8, which specifically comprises:

[0090] Step 801: obtaining the initial tooth arrangement of the upper jaw and the initial tooth arrangement of the lower jaw to be corrected, thereby generating a corresponding three-dimensional upper jaw digital model and a three-dimensional lower jaw digital model.

[0091] In some embodiments, the method for obtaining each model is similar to the method for obtaining the model in steps 101 to 103 described above, which will not be described here.

[0092] Step 802: processing the three-dimensional lower jaw digital model based on the method for generating a target tooth arrangement in the above embodiments to generate a target three-dimensional lower jaw digital model.

[0093] In some embodiments, the three-dimensional lower jaw digital model obtained in step 801 is processed according to the processing method in the above several embodiments in this step, that is, the three-dimensional lower jaw digital model is arranged by the WALA ridge of the lower jaw to obtain the target three-dimensional lower jaw digital model.

[0094] Step 803: obtaining the incisal point of each tooth of the lower jaw based on the target three-dimensional lower jaw digital model.

[0095] In some embodiments, the incisal point of the tooth can be obtained through the medical meaning of the feature point, or can be identified through a machine learning algorithm through a feature point identification model.

[0096] Step 804: collecting the incisal points of all teeth of the lower jaw to form a lower jaw incisal reference curve.

[0097] In some embodiments, the lower jaw incisal reference curve can be formed by sequentially connecting all incisal points, and it can be understood that the connected curve can be smoothed by a smoothing algorithm; in another embodiment, the lower jaw incisal reference curve can also be formed by fitting a three-dimensional curve for each incisal point. In actual applications, other methods can also be used to form the lower jaw incisal reference curve, which will not be listed one by one here.

[0098] Step 805: adjusting the three-dimensional upper jaw digital model based on the lower jaw incisal reference curve to generate a target three-dimensional upper jaw digital model.

[0099] In some embodiments, step 805 can comprise: adjusting the mandibular incisal reference curve in a direction perpendicular to a reference plane and in the reference plane respectively to obtain an upper incisal reference curve corresponding to the upper jaw; and adjusting the incisal feature position of the three-dimensional upper jaw digital model based on the upper incisal reference curve. The reference plane can be a jaw plane or a horizontal plane.

[0100] In some embodiments, adjusting the mandibular incisal reference curve in the direction perpendicular to the reference plane comprises: moving the anterior tooth area of the mandibular incisal reference curve downward by a first preset distance (e.g., 2 mm); and adjusting the mandibular incisal reference curve in the direction of the reference plane comprises: expanding the mandibular incisal reference curve along the buccal side.

[0101] In some embodiments, expanding the mandibular incisal reference curve along the buccal side comprises: expanding the anterior tooth area by a second preset distance (e.g., 2 mm); or in other embodiments, expanding the anterior tooth area by a third preset distance and expanding the posterior tooth area by a fourth preset distance, the third preset distance being smaller than the fourth preset distance. The adjustment method for transforming the mandibular incisal reference curve to the upper incisal reference curve is limited so as to accurately obtain the upper incisal reference curve. For example, when the preset target tooth arrangement is a shallow overlay, the setting method of different expansion amounts for the anterior tooth area and the posterior tooth area can be used, such as a third preset distance of 1 mm and a fourth preset distance of 3 mm.

[0102] In some embodiments, adjusting the three-dimensional upper jaw digital model based on the mandibular incisal reference curve comprises: adjusting the occlusal feature position of the three-dimensional upper jaw digital model based on the mandibular incisal reference curve; and the occlusal feature position comprises a lingual incisal point of the anterior tooth area and a central groove point of the posterior tooth area. Since the accurate matching of the occlusal feature position can make the occlusal relationship after tooth arrangement more stable, the present application limits that the occlusal feature position needs to be adjusted in the process of adjusting the upper tooth arrangement so as to obtain a more stable occlusal relationship of the target tooth arrangement.

[0103] It can be seen that, since the mandibular incisal reference curve and the upper incisal reference curve have a physiological corresponding rule, the present application limits that the upper incisal reference curve is obtained from the mandibular incisal reference curve obtained after the mandibular tooth arrangement, so that the upper jaw can be directly arranged according to the upper incisal reference curve, without obtaining the dental arch curve again, and without being affected by the uniformity of the initial upper tooth arrangement. The intermediate error caused by human adjustment of the tooth arrangement reference line is reduced, the degree of automation of the tooth arrangement process is improved, and the automatic tooth arrangement result is more accurate.

[0104] It is worth mentioning that the above examples of the present application are illustrative and do not limit the technical solutions of the present application.

[0105] The step division of the above various methods is only for the purpose of clear description, and can be combined into one step or split into multiple steps in implementation, as long as the same logical relationship is included, and all are within the protection scope of the patent; adding insignificant modifications or introducing insignificant designs in the algorithm or process, but not changing the core design of the algorithm and process, are within the protection scope of the patent.

[0106] Some other embodiments of the present application relate to an electronic device as shown in FIG. 9, comprising: at least one processor 901; and a memory 902 connected with the at least one processor 901 in communication; wherein the memory 902 stores instructions executable by the at least one processor 901, and the instructions are executed by the at least one processor 901 to enable the at least one processor 901 to perform the method for generating a target tooth layout in some of the above embodiments, or the digital modeling method of the dental orthodontic dental and jaw model in some of the above embodiments.

[0107] The memory and the processor are connected in a bus manner, the bus can include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors and memories together. The bus can also connect various other circuits such as peripheral devices, voltage stabilizers, and power management circuits, which are well known in the art, and 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, which provide units 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, and further, the antenna also receives data and transmits the data to the processor.

[0108] The processor 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. And the memory can be used to store the data used by the processor in the execution of the operation.

[0109] Some other embodiments of the present application relate to a computer readable storage medium storing a computer program. The computer program is executed by the processor to implement the method for generating a target tooth layout in some of the above embodiments, or the digital modeling method of the dental orthodontic dental and jaw model in some of the above embodiments.

[0110] That is, a person skilled in the art can understand that all or part of the steps in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a program stored in a storage medium, including a plurality of 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 aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0111] A person of ordinary skill in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A method for generating a target tooth arrangement, comprising: obtaining an initial tooth arrangement and a state of gingival tissue to be treated, thereby generating a three-dimensional digital model of the initial tooth arrangement; determining a WALA ridge-based spatial treatment reference curve based on the three-dimensional digital model; adjusting a position of each tooth in the three-dimensional digital model based on the spatial treatment reference curve, thereby generating a target three-dimensional digital model of the tooth arrangement; wherein the adjusting comprises: adjusting a position of an impedance center of each tooth to be the same as a corresponding position on the spatial treatment reference curve, and adjusting a horizontal distance between a FA point of each tooth and a corresponding position on the spatial treatment reference curve to be within a preset range.

2. The method for generating a target tooth layout of claim 1, wherein, The determining a WALA ridge-based spatial treatment reference curve based on the three-dimensional digital model comprises: presetting a local coordinate system of each tooth, wherein the local coordinate system comprises a labial-lingual axis and a root-crown axis; intersecting a cross section formed by the labial-lingual axis and the root-crown axis of a tooth with a gingival part of the three-dimensional digital model to obtain an intersection line, and selecting a most convex point on the intersection line on a labial side as a WALA ridge convex point of the tooth; collecting the WALA ridge convex points of the teeth, and connecting the WALA ridge convex points to form the WALA ridge.

3. The method for generating a target tooth layout of claim 2, wherein, After the WALA ridge is obtained, the method further comprises: smoothing the WALA ridge.

4. The method for generating a target tooth layout according to any one of claims 1-3, wherein, The adjusting the position of the impedance center of each tooth to be the same as the corresponding position on the spatial treatment reference curve comprises: calculating an initial position of the impedance center of each tooth, wherein if the three-dimensional digital model comprises a tooth root part, the initial position of the impedance center of each tooth is calculated according to a total height of the tooth; if the three-dimensional digital model comprises a tooth root part and an alveolar bone part, the initial position of the impedance center of each tooth is obtained by moving down a predetermined distance from a point on an intersection of the alveolar bone part and the tooth root part to a tooth long axis.

5. The method for generating a target tooth layout of claim 4, wherein, The predetermined distance is half a height of the tooth root.

6. The method for generating a target tooth layout of any one of claims 1-3, wherein, The adjusting the horizontal distance between the FA point of each tooth and the corresponding position on the spatial treatment reference curve to be within the preset range comprises: calculating an initial position of the FA point of each tooth; finding a nearest point of the FA point on the spatial treatment reference curve; moving the tooth based on the FA point of the tooth until a horizontal distance between the FA point and the nearest point on the spatial treatment reference curve is within the preset range.

7. The method for generating a target tooth layout of claim 6, wherein, The calculating the initial position of the FA point of each tooth comprises: presetting a local coordinate system of each tooth, wherein the local coordinate system comprises a labial-lingual axis and a root-crown axis; intersecting a cross section formed by the labial-lingual axis and the root-crown axis of a tooth with a tooth part of the three-dimensional digital model to obtain an intersection line, and selecting a segment of the intersection line from a gum line to a height of a tooth crown on a labial side as an FACC axis of the tooth; selecting a midpoint on the FACC axis as the initial position of the FA point of the tooth.

8. The method for generating a target tooth layout of claim 1, wherein, The adjusting the horizontal distance between the FA point of each tooth and the corresponding position on the spatial treatment reference curve to be within the preset range comprises: determining a feature point of a cutting edge of each tooth based on the three-dimensional digital model; adjusting the tooth until the feature points of the cutting edges of all the teeth form a smooth curve.

9. The method for generating a target tooth layout of claim 8, wherein, The incisal edge feature point of each tooth includes: when the tooth is a molar, the incisal edge feature point is a buccal cusp point; when the tooth is a premolar, the incisal edge feature point is a buccal cusp point or a buccal groove point; and when the tooth is an incisor or a canine, the incisal edge feature point is an upper incisal edge point.

10. The method for generating a target tooth layout of any one of claims 1-3, wherein, The adjusting of the positions of the teeth in the three-dimensional space based on the spatial orthodontic reference curve to generate a target three-dimensional dental model includes: adjusting the attitude angle of the teeth; wherein, The spatial positions of the teeth are adjusted until the attitude angle is a standard attitude angle or within an allowable error of the standard attitude angle; wherein the standard attitude is determined based on a standard dental model; and wherein the attitude angle includes a torque angle, a torsion angle and / or an axial inclination angle of the teeth.

11. The method for generating a target tooth layout of any one of claims 1-3, wherein, The adjusting of the positions of the teeth in the three-dimensional space based on the spatial orthodontic reference curve to generate a target three-dimensional dental model includes: gap detection and collision detection; wherein, The length of the dental arch curve is obtained on the jaw plane based on the three-dimensional dental model; The sum of the widths of all the teeth is obtained based on the three-dimensional dental model; The positions of the teeth in the mesiodistal direction are adjusted according to the relationship between the length of the dental arch curve and the sum of the widths until the gap standard is met.

12. A method for generating a target tooth layout, wherein, It includes: An initial dental layout of the upper jaw and an initial dental layout of the lower jaw to be corrected are obtained, thereby generating a corresponding three-dimensional upper jaw digital model and a three-dimensional lower jaw digital model; The three-dimensional lower jaw digital model is processed based on the method for generating a target dental layout according to any one of claims 1-11 to generate a target three-dimensional lower jaw digital model; The incisal edge points of each tooth of the lower jaw are obtained based on the target three-dimensional lower jaw digital model; The incisal edge points of all the teeth of the lower jaw are collected to form a lower jaw incisal edge reference curve; The three-dimensional upper jaw digital model is adjusted based on the lower jaw incisal edge reference curve to generate a target three-dimensional upper jaw digital model; It includes: adjusting the incisal edge points of each tooth of the upper jaw to meet the incisal edge reference curve.

13. The method for generating a target tooth layout of claim 12, wherein, The adjusting of the three-dimensional upper jaw digital model based on the lower jaw incisal edge reference curve includes: The lower jaw incisal edge reference curve is adjusted in the reference plane and the direction perpendicular to the reference plane to obtain the upper jaw incisal edge reference curve of the corresponding upper jaw; wherein the reference plane is a jaw plane or a horizontal plane; The incisal edge feature position of the three-dimensional upper jaw digital model is adjusted based on the upper jaw incisal edge reference curve.

14. The method for generating a target tooth layout of claim 13, wherein, The adjusting of the lower jaw incisal edge reference curve in the direction perpendicular to the reference plane includes: moving the front tooth area part of the lower jaw incisal edge reference curve downward by a first preset distance; The adjusting of the lower jaw incisal edge reference curve in the direction of the reference plane includes: expanding the lower jaw incisal edge reference curve along the buccal side; wherein the expansion is uniform at a second preset distance; or, The front tooth area is expanded by a third preset distance, and the back tooth area is expanded by a fourth preset distance, the third preset distance being smaller than the fourth preset distance.

15. The method for generating a target tooth layout of claim 12, wherein, The adjusting of the three-dimensional upper jaw digital model based on the lower jaw incisal edge reference curve includes: adjusting a position of an occlusal feature of the three-dimensional maxillary digital model based on the mandibular incisal reference curve; wherein the position of the occlusal feature comprises a lingual incisal point of an anterior region and a central groove point of a posterior region.

16. An electronic device, comprising: comprising: at least one processor; and, a memory communicatively connected to the at least one processor; wherein the memory has stored instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method for producing a target dental arrangement of any one of claims 1 to 15.

Images