Corrected tooth arrangement shape generation method and device

Abstract

A method for generating a corrective tooth arrangement shape for correcting teeth is disclosed. The corrective tooth arrangement shape generating method includes: a step of acquiring tooth shape information of a user; a step of extracting specific points of each tooth within a predetermined range based on the acquired tooth shape information for at least one of the upper jaw and the lower jaw of the user; a step of projecting the extracted specific points of each tooth onto a reference plane; a step of comparing the user's dental arch shape (arch form) connecting the specific points with a plurality of standard dental arch shapes stored in a database; a step of selecting a standard dental arch shape that is most similar to the user's dental arch shape from the stored plurality of standard dental arch shapes based on the comparison result; and a step of generating a corrective tooth arrangement shape based on the selected standard dental arch shape.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for generating a corrected tooth arrangement shape for correcting a user's dentition. Background Art

[0002] Orthodontics or orthodontics is usually performed to correct the position of teeth for medical or cosmetic purposes. The purpose of orthodontics is not only to simply straighten the teeth and align the deformed teeth, but also to correct various bone inconsistencies that occur during the growth process and life process, which helps to play a normal tooth function and thus provide healthy oral tissue. Bone inconsistencies not only affect the user's appearance but also the bone structure of the face, so it has become one of the important treatment targets.

[0003] In order to correct teeth to an accurate position or a normal angle during orthodontic treatment, materials are usually provided that apply a specified force to the teeth to move the teeth to a desired position within the alveolar bone. Orthodontic treatment can be performed in a variety of ways. As one example, an orthodontic device using brackets and wires made of metal or ceramic materials can be used. When using an orthodontic device, brackets are fixed to the surface of each tooth to be corrected, and correction wires are connected to multiple brackets. The elasticity or restoring force of the wires is used to apply correction force to the teeth, thereby gradually correcting deformed teeth.

[0004] In the process of orthodontic correction by providing orthodontic devices of various forms, it is necessary to generate a standard tooth arrangement shape as a target for correcting the dentition of a user and to manufacture the corrected tooth arrangement shape of the orthodontic device based on the standard tooth arrangement shape. Summary of the invention

[0005] Technical issues

[0006] The disclosed embodiments provide a method and apparatus for generating a corrective tooth arrangement shape for correcting a user's dentition.

[0007] Technical Solution

[0008] According to one embodiment, a method for generating a corrective tooth arrangement shape for correcting teeth includes: a step of acquiring the tooth shape information of the user; a step of extracting specific points of each tooth within a predetermined range based on the tooth shape information acquired for at least one of the upper jaw and the lower jaw of the user; a step of projecting the extracted specific points of each tooth onto a reference plane; a step of comparing the user's dental arch shape connecting the specific points with a plurality of standard dental arch shapes stored in a database; a step of selecting a standard dental arch shape that is most similar to the user's dental arch shape from the plurality of stored standard dental arch shapes based on the comparison result; and a step of generating a corrective tooth arrangement shape based on the selected standard dental arch shape.

[0009] Preferably, the specific point may be a facial axis point (FA point) of each tooth.

[0010] And, preferably, it also includes the step of projecting the extracted specific points of each tooth onto a reference plane, and comparing the user's dental arch shape (arch form) connected to the specific points projected onto the reference plane with the multiple standard dental arch shapes, thereby executing the comparison step.

[0011] Furthermore, preferably, the projection step includes: a step of determining the cheek points of each tooth within a predetermined range; a step of calculating the three-dimensional coordinates of the determined cheek points based on any reference point; a step of generating the reference plane using the calculated coordinates; and a step of projecting the cheek points onto the generated reference plane and calculating the two-dimensional coordinates of the cheek points projected onto the reference plane.

[0012] Furthermore, preferably, in the step of generating the reference plane, a reference plane having the smallest sum of perpendicular distances from the cheek points may be generated.

[0013] Furthermore, preferably, in the step of generating the reference plane, a vertical distance from each cheek point e1 to e n The reference plane with the minimum E value calculated by the following formula is represented as follows,

[0014]

[0015] Furthermore, preferably, the plurality of standard dental arch shapes are classified by statistical analysis based on a plurality of normal occlusal models, and can be represented by a cubic function on a two-dimensional plane formed by an x-axis and a y-axis.

[0016] And, preferably, the above-mentioned multiple standard dental arch shapes are as follows

[0017] The cubic function represents that each standard dental arch shape may have different coefficients β1 and β2.

[0018] And, preferably, in the above-mentioned comparing step, a curve represented by the above-mentioned cubic function in a manner most similar to the user's dental arch shape connecting the cheek points of the above-mentioned teeth is determined, and the determined above-mentioned curve can be compared with the above-mentioned multiple standard dental arch shapes.

[0019] And, preferably, in the above-mentioned comparing step, based on the minimum value of the area or distance of the space generated by overlapping multiple standard dental arch shapes with the above-mentioned user dental arch shape, a curve most similar to the above-mentioned user dental arch shape can be determined.

[0020] And, preferably, in the above-mentioned selection step, based on the differences between the coefficients β1 and β2 of the above-mentioned standard dental arch shapes and the coefficients β1 and β2 of the above-mentioned curve, a standard dental arch shape having a curvature most similar to the determined above-mentioned curve can be selected.

[0021] Furthermore, preferably, in the step of acquiring the tooth shape information of the user, a task of distinguishing the plurality of teeth and gums of the user from each other may also be performed.

[0022] Furthermore, preferably, the plurality of standard dental arch shapes may include three standard dental arch shapes having different values ​​of coefficients β1 and β2 for the upper jaw and the lower jaw, respectively.

[0023] According to an embodiment of the present invention, a device for generating a corrective tooth arrangement shape comprises: a processor; and a memory storing instructions executable by the processor, wherein the processor executes the instructions to obtain tooth shape information of the user, and for at least one of the upper jaw and the lower jaw of the user, based on the tooth shape information obtained, specific points of each tooth are extracted within a predetermined range, the extracted specific points of each tooth are projected onto a reference plane, and a dental arch shape connecting the specific points is compared with a plurality of standard dental arch shapes stored in a database, and based on the comparison result, a standard dental arch shape most similar to the dental arch shape is selected from the plurality of standard dental arch shapes stored, and a corrective tooth arrangement shape is generated based on the selected standard dental arch shape.

[0024] Preferably, the specific point may be a facial axis point (FA point) of each tooth.

[0025] Furthermore, preferably, the processor projects the extracted specific points of each tooth onto a reference plane, and can compare a user's dental arch shape connected to the specific points projected onto the reference plane with the plurality of standard dental arch shapes.

[0026] Furthermore, preferably, the processor determines the cheek points of each tooth within a predetermined range, calculates the three-dimensional coordinates of the cheek points determined by taking any reference point as a reference, generates the reference plane using the calculated coordinates, projects the cheek points on the generated reference plane, and calculates the two-dimensional coordinates of the cheek points projected onto the reference plane.

[0027] And, preferably, the processor can generate a reference plane with the smallest sum of vertical distances from the cheek points.

[0028] And, preferably, the processor can generate a vertical distance from each cheek point e1 to e n The reference plane with the minimum E value calculated by the following formula is represented as:

[0029]

[0030] Furthermore, preferably, the plurality of standard dental arch shapes are classified by statistical analysis based on a plurality of normal occlusal models, and can be represented by a cubic function on a two-dimensional plane formed by an x-axis and a y-axis.

[0031] And, preferably, the above-mentioned multiple standard dental arch shapes are as follows

[0032] The cubic function represents that each standard dental arch shape may have different coefficients β1 and β2.

[0033] And, preferably, the processor determines a curve represented by the cubic function in a manner most similar to the user's dental arch shape connecting cheek points of the teeth, and the determined curve can be compared with the plurality of standard dental arch shapes.

[0034] Furthermore, preferably, the processor may determine a curve most similar to the user's dental arch shape based on a minimum value of an area or distance of a space generated by overlapping a plurality of standard dental arch shapes with the user's dental arch shape.

[0035] And, preferably, the processor may select a standard dental arch shape having a curvature most similar to the determined curve based on the difference between the coefficients β1 and β2 of the standard dental arch shapes and the coefficients β1 and β2 of the curve.

[0036] And, preferably, the processor can distinguish between multiple teeth and gums of the user.

[0037] Furthermore, preferably, the plurality of standard dental arch shapes may include three standard dental arch shapes having different values ​​of coefficients β1 and β2 for the upper jaw and the lower jaw, respectively.

[0038] Effects of the Invention

[0039] According to the various embodiments of the present invention described above, a corrected tooth arrangement shape for correcting the user's dentition can be more quickly and conveniently correctly generated and applied to the user's dentition. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present disclosure can be easily understood by referring to the following detailed description in conjunction with the accompanying drawings, in which reference numerals refer to structural elements.

[0041] Figure 1 is a block diagram showing a device for generating a corrected tooth arrangement shape according to an embodiment,

[0042] Figure 2 is a flowchart for illustrating a method for generating a corrected tooth arrangement shape according to an embodiment.

[0043] Figure 3 is a diagram for explaining a dental arch shape according to an embodiment,

[0044] Figure 4 is a diagram for explaining a method for determining a facial axis point according to an embodiment.

[0045] Figure 5 is a diagram for explaining a cheek point setting method for a plurality of teeth according to an embodiment,

[0046] Figure 6a and 6b is a diagram for explaining a method for determining three-dimensional coordinates of cheek points about a plurality of teeth according to an embodiment,

[0047] Figure 7 is a diagram for explaining a reference plane setting method according to an embodiment,

[0048] Figure 8a and 8b is a diagram for explaining a standard dental arch shape according to an embodiment,

[0049] Fig. 9 is a diagram for explaining two-dimensional coordinates of cheek points reset on a reference plane according to an embodiment,

[0050] Fig.10 is a diagram for explaining a method for determining a cubic function curve based on two-dimensional coordinates of cheek points according to an embodiment,

[0051] Fig.11 is a diagram for explaining a method of comparing a cubic function curve of a cheek point with a standard dental arch shape according to an embodiment,

[0052] Fig.12 is a block diagram showing a system for generating a corrected tooth arrangement shape according to an embodiment. DETAILED DESCRIPTION

[0053] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. At this time, it should be noted that the same structural elements in the accompanying drawings are represented by the same reference numerals as much as possible. In addition, detailed descriptions of known functions and structures that may make the main purpose of the present invention unclear are omitted.

[0054] Some embodiments of the present disclosure may implement a function block structure and a variety of processing steps. Part or all of such function blocks may be implemented by a variety of hardware and / or software structures that perform specific functions. For example, the function blocks of the present disclosure may be implemented by more than one microprocessor, or may be implemented by a circuit structure for a specified function. And, for example, the function blocks of the present disclosure may be implemented by a variety of programming languages ​​or scripting languages. The function blocks may be implemented by algorithms executed in more than one processor. And, the present disclosure may adopt existing technologies for electronic configuration, signal processing and / or data processing, etc.

[0055] Furthermore, the terms "unit", "module" and the like recorded in this specification mean a unit that processes at least one function or action, which can be implemented by hardware or software or by a combination of hardware and software. "Unit" and "module" can also be implemented by a program stored in an addressable storage medium and activated by a processor.

[0056] For example, a "unit" or a "module" can be implemented by structural elements such as multiple software structural elements, multiple object-oriented software structural elements, multiple class structural elements, and multiple task structural elements, and multiple processors, multiple functions, multiple attributes, multiple procedures, multiple subroutines, multiple program code segments, multiple drivers, firmware, microcode, circuits, data, databases, multiple data structures, multiple tables, multiple displays, and variables.

[0057] Throughout the specification, when some parts are "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" with a device interposed therebetween. Throughout the specification, when some parts "include" some structural elements, this means that other structural elements may also be included, rather than excluded, unless there is any special record to the contrary.

[0058] Furthermore, the connecting lines or connecting parts between the multiple structural elements shown in the drawings are only exemplary functional connections and / or physical or circuit connections. The connections between the multiple structural elements may be presented according to a variety of functional connections, physical connections or circuit connections that can be replaced or added in the actual device.

[0059] The terms used in the present invention are only used to illustrate specific embodiments and do not limit the intent of the present invention. Singular expressions include multiple expressions as long as there is no obvious difference in the context. In the present invention, it should be understood that terms such as "including" or "having" specify the existence of features, numbers, steps, actions, structural elements, components or combinations thereof recorded in the specification, rather than excluding in advance the existence or additional possibilities of one or more other features or numbers, steps, actions, structural elements, components or combinations thereof. That is, the content described as "including" a specific structure in the present invention does not exclude structures other than the structure, but means that the additional structure may be included in the scope of the embodiment of the present invention or the technical idea of ​​the present invention.

[0060] Some structural elements of the present invention are not essential structural elements that perform essential functions in the present invention, but can be selective structural elements that are only used to improve performance. The present invention may include only structural parts required to realize the essence of the present invention other than structural elements used only to improve performance, and a structure that includes only essential structural elements other than selective structural elements used only to improve performance is also included in the scope of the present invention.

[0061] Figure 1 is a block diagram showing an apparatus for generating a corrected tooth arrangement shape according to an embodiment.

[0062] Reference Figure 1 , the orthodontic tooth arrangement shape generating device 100 may include a processor 110, a transceiver 120, a memory 130 and a display 140. However, Figure 1 The structural elements shown are not all necessary structural elements of the orthodontic tooth arrangement shape generating device 100. Figure 1 The tooth arrangement shape generating device 100 with more structural elements as shown can also be based on the structure compared to Figure 1 The tooth arrangement shape generating device 100 shown in the figure realizes correction with a small number of components.

[0063] The orthodontic tooth arrangement shape generating device 100 can obtain the user's tooth shape information. In order to correct teeth, it is necessary to measure the oral cavity of the user who is the correction object. The user's tooth shape information may include multiple tooth shapes formed in the user's oral cavity, the formation position and direction, etc. The tooth shape information may include the soft part of the gums below the gum line. The orthodontic tooth arrangement shape generating device 100 may also have a tooth shape information acquiring unit to directly acquire the user's tooth shape information, or may receive the user's tooth shape information generated in advance from the outside.

[0064] In the embodiment, the user's tooth shape information can be obtained by scanning. The scanning method is a method of obtaining the user's oral information using an information acquisition device such as an optical 3D scanner or a therapeutic CT, and processing the acquired information to obtain the overall tooth shape information. The scanning method using an optical 3D scanner or CT is useful because it can obtain tooth shape information even without physical contact with the user's teeth or gums.

[0065] In an embodiment, the tooth shape information can also be obtained in a plaster method. The plaster method is a method of inserting a solidified plaster material component into the user's mouth, and through the solidification shape, the teeth in the user's mouth are sampled to obtain the tooth shape information. The plaster method may cause discomfort to the patient and may take a relatively long time compared to the scanning method.

[0066] The information acquired by scanning or plastering can be converted into a 3D modeling form through digital processing. The user can check the tooth shape information converted into a 3D modeling form and output through the display 140.

[0067] In the embodiment, the tooth shape information may include the shapes of multiple teeth and gums. The orthodontic tooth arrangement shape generating device 100 may distinguish the multiple teeth and gums included in the tooth shape information from each other. For example, the orthodontic tooth arrangement shape generating device 100 may distinguish the multiple teeth and gums based on information such as the color difference, brightness difference, and a predetermined boundary between the teeth and gums. However, the information used by the orthodontic tooth arrangement shape generating device 100 for distinguishing actions is not limited to the above example.

[0068] For at least one of the upper and lower jaws of the user, the orthodontic tooth arrangement shape generating device 100 can extract specific points of each tooth within a predetermined range based on the acquired tooth shape information. The specific points can be the facial axis points (FA points) of each tooth. Figure 4 and 5 The relevant details will be discussed later.

[0069] The orthodontic tooth arrangement shape generating device 100 projects the extracted specific points onto a reference plane, and can compare the user's dental arch shape connected to the specific points projected onto the reference plane with a plurality of standard dental arch shapes stored in a database. The reference plane may be a plane with the smallest sum of vertical distances from the cheek points of each tooth. At this time, the orthodontic tooth arrangement shape generating device 100 calculates the three-dimensional coordinates of the cheek points of each tooth, and using the calculated coordinates, can generate a reference plane with the smallest sum of vertical distances from each cheek point.

[0070] Based on the comparison result, the orthodontic tooth arrangement shape generating device 100 can select a standard dental arch shape that is most similar to the user's dental arch shape from among the multiple standard dental arch shapes stored in the database. The multiple standard dental arch shapes can be classified by statistical cluster analysis of dental arch shapes studied as normal occlusal models. The results of a survey of hundreds of normal occlusal people who are not malocclusion patients show that the multiple standard dental arch shapes can be classified into a limited number of groups composed of dental arch shapes without distortions such as asymmetry through cluster analysis.

[0071] On the other hand, the orthodontic tooth arrangement shape generating device 100 can generate a corrected tooth arrangement shape based on the selected standard tooth arrangement shape information. The corrected tooth arrangement shape is the shape of the orthodontic device used to model the standard tooth arrangement shape of the selected user's teeth. In an embodiment, the corrected tooth arrangement shape can also be provided to transform the user's teeth into the standard tooth arrangement shape all at once, or can be provided multiple times to reduce the burden imposed on the user's teeth, so that it changes gradually, and its overall change target becomes the standard tooth arrangement shape.

[0072] The processor 110 controls the overall operation of the orthodontic tooth arrangement shape generating device 100. The processor 110 performs basic arithmetic, logic and input-output operations for acquiring and processing tooth arrangement shape information, and can process at least one instruction. The above instructions can be provided to the processor 110 from the memory 130. That is, the processor 110 can execute the instructions according to the program code stored in a recording device such as the memory 130. Alternatively, the instructions can also be received by the orthodontic tooth arrangement shape generating device 100 through the transceiver 120 and provided to the processor 110.

[0073] The transceiver 120 may include one or more components that enable communication between the orthodontic tooth arrangement shape generation apparatus 100 and a server or an external device.

[0074] The memory 130 may store a program for processing and controlling the processor 110, and may also store data input to or output from the orthodontic tooth arrangement shape generating apparatus 100. Also, the memory 130 may store a database including a plurality of standard tooth shape information.

[0075] The memory (130) may include at least one type of storage medium selected from the group consisting of a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., SD or XD memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and an optical disk.

[0076] The display 140 displays and outputs information processed in the orthodontic teeth arrangement shape generating device 100. For example, the display 140 may display a user interface for providing the user with the user's teeth arrangement shape information, standard teeth arrangement shape information as a correction target, or a corrected teeth arrangement shape for generating an orthodontic device.

[0077] The display 140 can be used as an input device in addition to an output device. The display 140 may include at least one of a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, a three-dimensional display, and an electrophoretic display.

[0078] Figure 2 is a flowchart for explaining a method for generating a corrected tooth arrangement shape according to an embodiment.

[0079] First, the user's tooth shape information is acquired (S210).

[0080] Then, for at least one of the upper jaw and the lower jaw of the user, specific points of each tooth are extracted within a predetermined range based on the acquired tooth shape information (S220). At this time, the specific points may be cheek points of each tooth.

[0081] Then, the extracted specific points of each tooth are projected onto a reference plane ( S230 ).

[0082] Furthermore, in the embodiment, the cheek points of each tooth are determined within a predetermined range, and the three-dimensional coordinates of the determined cheek points can be calculated based on any reference point. Using the calculated coordinates, a reference plane with the minimum sum of vertical distances from each cheek point can be generated, and each cheek point can be projected on the generated reference plane, and the two-dimensional coordinates of each cheek point projected on the reference plane can be calculated.

[0083] Subsequently, the user's dental arch shape connecting the specific points is compared with a plurality of standard dental arch shapes stored in the database (S240). At this time, a curve represented by a cubic function in a manner most similar to the user's dental arch shape connecting the cheek points of each tooth is determined, and the determined curve can be compared with a plurality of standard dental arch shapes.

[0084] Among them, Figure 3 As shown, the dental arch shape means the arc of the teeth shown on the occlusal plane surrounded by the curved shape.

[0085] Subsequently, based on the comparison result, a standard dental arch shape that is most similar to the user's dental arch shape is selected from the stored plurality of standard dental arch shapes (S250). At this time, based on the difference between the coefficients of each standard dental arch shape and the coefficients of the curve determined to be most similar to the user's dental arch shape, a standard dental arch shape having a curvature most similar to the determined curve may be selected.

[0086] Then, based on the selected standard dental arch shape, a corrected tooth arrangement shape is generated (S260).

[0087] Figure 4 FIG. 1 is a diagram for explaining a method for determining a facial axis point according to an embodiment. Figure 4 An example of a tooth including a crown and a root is shown.

[0088] Reference Figure 4 , the bisection point of the occlusion of the gingiva (gingiva) of the clinical crown (Clinical Crown) of each tooth, that is, the position corresponding to the intersection of the axes shown becomes the cheek point of the tooth. The orthodontic tooth arrangement shape generation device 100 determines the long axis of the tooth based on the shape of each tooth, and can determine the cheek point of each tooth based on this even without user input.

[0089] Figure 5 FIG. 1 is a diagram for explaining a cheek point setting method for a plurality of teeth according to an embodiment.

[0090] Reference Figure 5 , the cheek points of each tooth can be confirmed to be displayed as points. As described above, the line connecting the cheek points of each tooth can represent the dental arch form.

[0091] And, refer to Figure 5 , the cheek points of the plurality of teeth are selected independently of each other. Therefore, for each tooth, the movement amount of each cheek point can be calculated based on the preset weighting value.

[0092] Figure 6a and 6b FIG. 1 is a diagram for explaining a method of determining three-dimensional coordinates of cheek points about a plurality of teeth according to an embodiment.

[0093] The cheek points determined for multiple teeth can be represented by coordinates in three-dimensional space, such as Figure 6a As shown, the three-dimensional coordinates of each cheek point can be calculated based on any reference point. Preferably, for any reference point, the cheek point is set so as to be present inside the user's dental arch shape generated by connecting to each other.

[0094] Reference Figure 6b , extending the x, y, and z axes from any reference point, the three-dimensional coordinates of each cheek point can be calculated. At this time, the three-dimensional coordinates of the reference point become (0,0,0). Figure 6b For the sake of convenience, only the upper jaw is shown with the three-dimensional coordinates of the cheek points of each tooth.

[0095] Figure 7 It is a diagram for explaining a reference plane setting method according to an embodiment.

[0096] In one embodiment, a reference plane for regenerating the two-dimensional coordinates of cheek points of multiple teeth may be set, wherein the plane with the smallest sum of vertical distances from cheek points of all teeth within a predetermined range may be set as the reference plane.

[0097] Specifically, from each cheek point f1 to f n The vertical distance of any virtual plane can be set to e1 to e n . Figure 7 Indicates the vertical distance of any virtual plane from the 14th tooth to the 17th tooth.

[0098] At this time, the sum E of the vertical distances from the cheek points of all teeth within a predetermined range can be expressed by the following formula.

[0099]

Mathematical formula 1

[0100]

[0101] At this time, a virtual plane with the smallest E value can be set as a reference plane.

[0102] Figure 8a and 8b FIG. 1 is a diagram for explaining a standard dental arch shape according to an embodiment.

[0103] like Figure 8a As shown in FIG. 1 , a plurality of standard dental arch shapes can be classified by statistical cluster analysis of dental arch shapes studied with a normal occlusal model as an object. (a) shows a specimen related to the upper jaw analysis, and (b) shows a specimen related to the lower jaw analysis.

[0104] The results of a survey of several hundred people with normal occlusion who were not maloccluses showed that a plurality of standard dental arch shapes could be classified into a plurality of limited groups consisting of dental arch shapes without distortions such as asymmetry by cluster analysis.

[0105] Reference Figure 8b As shown in (a), the standard dental arch shape may include three standard dental arch shapes for the upper jaw, and as shown in (b), the standard dental arch shape may also include three standard dental arch shapes for the lower jaw. The three standard dental arch shapes may have different curvatures in at least one region.

[0106] However, this is exemplary, and according to an embodiment, the number of standard dental arch shapes for the upper jaw and the lower jaw may be more than 3. Furthermore, according to an embodiment, based on the race, gender, age distribution, etc. of the normal articulators as the cluster analysis object, different numbers and forms of standard dental arch shapes may be set.

[0107] On the other hand, the standard dental arch shape can be expressed by the following function on a two-dimensional plane formed by the x-axis and the y-axis.

[0108]

Mathematical formula 2

[0109] y=β1×x 3 +β2×x 2 (x>0)

[0110] y=-β1×x 3 +β2×x 2 (x<0)

[0111] At this time, each standard dental arch shape may have different coefficients β1 and β2.

[0112] Fig. 9 FIG. 4 is a diagram for explaining two-dimensional coordinates of cheek points reset on a reference plane according to an embodiment.

[0113] Fig. 9The cheek points of 14 teeth (11th to 17th, 21st to 27th) within a predetermined range are projected onto a two-dimensional reference plane. Each cheek point projected onto the reference plane has a two-dimensional coordinate (x, y) reset on the reference plane.

[0114] Fig.10 4 is a diagram for explaining a method for determining a cubic function curve based on two-dimensional coordinates of cheek points according to an embodiment.

[0115] like Fig.10 As shown, the user dental arch shape can be generated by connecting the cheek points projected onto the reference plane. If the user dental arch shape is generated, the generated user dental arch shape is compared with a plurality of standard dental arch shapes, and the standard dental arch shape most similar to the user dental arch shape can be selected.

[0116] Specifically, a curve represented by a cubic function in a manner most similar to the user's dental arch shape is determined, and a standard dental arch shape most similar to the user's dental arch shape is selected by comparing the determined curve with a plurality of standard dental arch shapes. The curve represented by a cubic function in a manner most similar to the user's dental arch shape can also be represented by a cubic function based on the above mathematical formula 2. That is, the coefficients β1 and β2 of the cubic function having a curve most similar to the user's dental arch shape can be found.

[0117] In one embodiment, in order to determine the similarity between the user's dental arch shape and the curve represented by the cubic function, as shown in FIG. Fig.10 As shown, the area of ​​space n1 generated by overlapping the user's dental arch shape and the curve can be used. By calculating the area of ​​n1 based on coefficients β1 and β2, a curve based on a cubic function of coefficients β1 and β2 that minimizes the area of ​​n1 can be determined.

[0118] Fig.11 : is a diagram for explaining a method of comparing a cubic function curve of cheek points with a standard dental arch shape according to an embodiment.

[0119] like Fig.11 As shown, the coefficients β1 and β2 based on the standard dental arch shapes and Fig.10 The difference between the coefficients β1 and β2 of the curve calculated by the process can select the standard dental arch shape with the curvature most similar to the curve.

[0120] For example, the β1 and β2 values ​​of the first standard dental arch shape (cluster 1) may be a1 and b1, respectively, the β1 and β2 values ​​of the second standard dental arch shape (cluster 2) may be a2 and b2, respectively, and the β1 and β2 values ​​of the third standard dental arch shape (cluster 3) may be a3 and b3, respectively. The β1 and β2 values ​​may be positive and / or negative. Fig.10 The coefficients β1 and β2 values ​​of the curve calculated by the process are compared with the coefficients β1 and β2 values ​​of the standard dental arch shape, and the standard dental arch shape with the smallest difference in coefficients can be selected.

[0121] Reference Fig.11 , the standard dental arch shape that is most similar to the cubic function curve calculated from the user's dental arch shape becomes the second standard dental arch shape or the third standard dental arch shape. In this case, the second standard dental arch shape that is most closely connected to the cubic function curve calculated from the user's dental arch shape can be selected as the standard dental arch shape for generating the tooth arrangement shape.

[0122] However, according to an embodiment, in order to make the tooth arrangement shape not too compact and include a spare space, a third standard dental arch shape having a curvature that includes the cubic function curve inside may be selected.

[0123] Fig.12 is a block diagram showing a system for generating a corrected tooth arrangement shape according to an embodiment.

[0124] Reference Fig.12 The orthodontic tooth arrangement shape generation system 1000 includes an orthodontic tooth arrangement shape generation device 1100 and a server 1200 .

[0125] The orthodontic tooth arrangement shape generation device 1100 can obtain the user's tooth shape information. The orthodontic tooth arrangement shape generation device 1100 has a tooth shape information acquisition unit, and can directly obtain the user's tooth shape information, or receive the user's tooth shape information generated in advance from the outside.

[0126] In an embodiment, the user's tooth shape information may also be obtained by scanning, and the tooth shape information may also be obtained by plastering.

[0127] In the orthodontic tooth arrangement shape generating device 1100, for at least one of the upper and lower jaws of the user, specific points of each tooth can be extracted within a predetermined range based on the acquired tooth shape information. The specific points can be facial axis points (FA points) of each tooth.

[0128] The orthodontic tooth arrangement shape generating device 1100 projects the extracted specific points onto a reference plane, and can compare the user's dental arch shape connected to the specific points projected onto the reference plane with a plurality of standard dental arch shapes stored in a database. The reference plane can be a plane with the smallest sum of vertical distances from the cheek points of each tooth.

[0129] Based on the comparison result, the orthodontic tooth arrangement shape generating device 1100 can select a standard dental arch shape that is most similar to the user's dental arch shape from among the multiple standard dental arch shapes stored in the database. The multiple standard dental arch shapes can be classified by statistical clustering analysis of dental arch shapes studied with the normal occlusal model as the object.

[0130] On the other hand, the orthodontic tooth arrangement shape generating device 1100 can generate a corrected tooth arrangement shape based on the selected standard tooth arrangement shape information. In an embodiment, the corrected tooth arrangement shape can also be provided to transform the user's teeth into the standard tooth arrangement shape all at once, or can be provided multiple times to reduce the burden imposed on the user's teeth, gradually change them, and make their overall change target the standard tooth arrangement shape.

[0131] The server 1200 communicates with the orthodontic tooth arrangement shape generating device 1100, and can provide information required for the orthodontic tooth arrangement shape to the orthodontic tooth arrangement shape generating device 1100. In addition, the server 1200 stores the orthodontic device modeling provided by the orthodontic tooth arrangement shape generating device 1100, and can provide the modeling to the orthodontic device generating device for realizing as an actual orthodontic device.

[0132] On the other hand, the above embodiments can be made into a program that can be started on a computer, and can be implemented in a general-purpose digital computer that uses a computer-readable medium to start the above program. In addition, the structure of the data used in the above embodiments can be recorded in a computer-readable medium by various means. In addition, the above embodiments can be implemented in the form of a recording medium including computer-executable instructions such as a program module started by a computer. For example, a software module or a method implemented by an algorithm can be stored in a computer-readable recording medium as a computer-readable and executable code or program instruction.

[0133] Computer readable media may be any recording medium that can be accessed by a computer, and may include volatile and non-volatile media, separate and non-separable media. Computer readable media may include magnetic storage media such as read-only memory, floppy disks, hard disks, etc., and may include optical readable media such as read-only CDs, DVDs and other storage media, but are not limited thereto. Furthermore, computer readable media may include computer storage media and communication media.

[0134] Furthermore, a plurality of computer-readable recording media may be distributed in computer systems connected via a network, and data such as program instructions and codes stored in the distributed recording media may be executed by at least one computer.

[0135] The specific embodiment described in this disclosure is only one embodiment, and any method cannot limit the scope of this disclosure. In order to simplify the description, the previous description of electronic structure, control system, software and other functional aspects of the above system may be omitted.

Claims

1. A method for generating a corrected tooth arrangement shape for orthodontic treatment, characterized in that: include: The step of obtaining the user's tooth shape information; For at least one of the upper jaw and the lower jaw of the user, based on the acquired tooth shape information, a step of extracting specific points of each tooth within a predetermined range; A step of comparing the user's dental arch shape connecting the specific points with a plurality of standard dental arch shapes stored in a database; Based on the comparison result, a step of selecting a standard dental arch shape that is most similar to the dental arch shape of the user from among the plurality of stored standard dental arch shapes; as well as The step of generating a corrected tooth arrangement shape based on the selected standard dental arch shape, The specific points are cheek points of each tooth, The method further comprises the step of projecting the extracted specific points of each tooth onto a reference plane. In the comparing step, the user's dental arch shape connected to the specific point projected onto the reference plane is compared with the plurality of standard dental arch shapes. The projecting step comprises: The step of determining the cheek point of each tooth within a given range; The step of calculating the three-dimensional coordinates of each cheek point determined based on any reference point; a step of generating the reference plane using the calculated coordinates; and The step of projecting the cheek points onto the generated reference plane and calculating the two-dimensional coordinates of the cheek points projected onto the reference plane.

2. The method according to claim 1, characterized in that In the step of generating the reference plane, a reference plane is generated in which the sum of perpendicular distances from the cheek points is minimized.

3. The method according to claim 2, characterized in that In the step of generating the reference plane, Generate the perpendicular distance from each cheek point e1 to e n The reference plane with the minimum E value calculated by the following formula is represented as:

4. The method according to claim 1, characterized in that: The plurality of standard dental arch shapes are classified by statistical analysis based on a plurality of normal occlusal models, and are represented by a cubic function on a two-dimensional plane formed by an x-axis and a y-axis.

5. The method according to claim 4, characterized in that The multiple standard dental arch shapes are as follows The cubic function indicates that each standard dental arch shape has different coefficients β1 and β2.

6. The method according to claim 5, characterized in that In the comparing step, A curve represented by the cubic function in a manner most similar to a user's dental arch shape connecting cheek points of the teeth is determined, and the determined curve is compared with the plurality of standard dental arch shapes.

7. The method according to claim 6, characterized in that In the comparing step, a curve most similar to the user's dental arch shape is determined based on a minimum value of an area or a distance of a space generated by overlapping a plurality of standard dental arch shapes with the user's dental arch shape.

8. The method according to claim 7, characterized in that In the step of selecting, Based on the difference between the coefficients β1 and β2 of the standard dental arch shapes and the coefficients β1 and β2 of the curve, a standard dental arch shape having a curvature most similar to the determined curve is selected.

9. The method according to claim 1, characterized in that: The acquiring step includes the step of distinguishing a plurality of teeth and gums of the user from each other.

10. The method according to claim 5, characterized in that The plurality of standard dental arch shapes include three standard dental arch shapes with different coefficients β1 and β2 values ​​for the upper jaw and the lower jaw, respectively.

11. A device for generating a corrective tooth arrangement shape, characterized in that: include: Processor; and a memory storing instructions executable by the processor, The processor executes the instruction to obtain the tooth shape information of the user, and for at least one of the upper jaw and the lower jaw of the user, based on the obtained tooth shape information, extracts specific points of each tooth within a predetermined range, projects the extracted specific points of each tooth onto a reference plane, compares a dental arch shape connecting the specific points with a plurality of standard dental arch shapes stored in a database, selects a standard dental arch shape that is most similar to the dental arch shape from the plurality of stored standard dental arch shapes based on the comparison result, and generates a corrected tooth arrangement shape based on the selected standard dental arch shape. The specific points are cheek points of each tooth, The processor projects the extracted specific points of each tooth onto a reference plane, and compares the user's dental arch shape connected to the specific points projected onto the reference plane with the plurality of standard dental arch shapes. The processor determines the cheek points of each tooth within a predetermined range, calculates the three-dimensional coordinates of each cheek point based on any reference point, generates the reference plane using the calculated coordinates, projects each cheek point on the generated reference plane, and calculates the two-dimensional coordinates of each cheek point projected onto the reference plane.

12. The device for generating a corrected tooth arrangement shape according to claim 11, characterized in that: The processor generates a reference plane that minimizes the sum of perpendicular distances from the cheek points.

13. The device for generating a corrected tooth arrangement shape according to claim 12, characterized in that: The processor generates a vertical distance from each cheek point e1 to e n The reference plane with the minimum E value calculated by the following formula is represented as:

14. The device for generating a corrected tooth arrangement shape according to claim 11, characterized in that: The plurality of standard dental arch shapes are classified by statistical analysis based on a plurality of normal occlusal models, and are represented by a cubic function on a two-dimensional plane formed by an x-axis and a y-axis.

15. The device for generating a corrected tooth arrangement shape according to claim 14, characterized in that: The multiple standard dental arch shapes are as follows The cubic function indicates that each standard dental arch shape has different coefficients β1 and β2.

16. The device for generating a corrected tooth arrangement shape according to claim 15, characterized in that: The processor determines a curve represented by the cubic function in a manner most similar to a user's dental arch shape connecting cheek points of the teeth, and compares the determined curve with the plurality of standard dental arch shapes.

17. The device for generating a corrected tooth arrangement shape according to claim 16, characterized in that: The processor determines a curve most similar to the user's dental arch shape based on a minimum value of an area or a distance of a space generated by overlapping a plurality of standard dental arch shapes with the user's dental arch shape.

18. The device for generating a corrected tooth arrangement shape according to claim 17, characterized in that: The processor selects a standard dental arch shape having a curvature most similar to the determined curve based on differences between the coefficients β1 and β2 of the standard dental arch shapes and the coefficients β1 and β2 of the curve.

19. The device for generating a corrected tooth arrangement shape according to claim 11, characterized in that: The processor distinguishes the plurality of teeth and gums of the user from one another.

20. The device for generating a corrected tooth arrangement shape according to claim 15, characterized in that: The plurality of standard dental arch shapes include three standard dental arch shapes with different coefficients β1 and β2 values ​​for the upper jaw and the lower jaw, respectively.

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