WO2024131158A1

WO2024131158A1 - Dental crown production method and apparatus, device, and medium

Info

Publication number: WO2024131158A1
Application number: PCT/CN2023/118329
Authority: WO
Inventors: 江腾飞; 张健; 甄圣贤; 陆炎; 贾颜铭
Original assignee: 先临三维科技股份有限公司
Priority date: 2022-12-19
Filing date: 2023-09-12
Publication date: 2024-06-27
Also published as: CN116229013A

Abstract

Embodiments of the present disclosure relate to a dental crown production method and apparatus, a device, and a medium. The method comprises: acquiring jaw data of a dental crown to be produced; performing processing on the basis of the jaw data to obtain a dental crown area; acquiring a target tooth model from a preset tooth model database on the basis of the dental crown area and the jaw data; and performing calculation on the basis of the target tooth model and the jaw data to obtain a dental crown. According to the technical solution, the jaw data and/or the target tooth model can be repeatedly modified to obtain a dental crown meeting requirements, so that manufacturing costs of the dental crown are reduced, and manufacturing efficiency of the dental crown is improved.

Description

A method, device, equipment and medium for generating a tooth crown

This disclosure claims priority to a Chinese patent application filed with the Chinese Patent Office on December 19, 2022, with application number 202211639689.3 and invention name “A method, device, equipment and medium for generating a dental crown”, the entire contents of which are incorporated by reference in this disclosure.

Technical Field

The present disclosure relates to the field of digital oral technology, and in particular to a method, device, equipment and medium for generating a tooth crown.

Background technique

In recent years, digital dental technology has developed rapidly, and orthodontics has gradually become popular. After users have dental implants, there is a recovery period. In order to solve the patient's dietary problems during this period, temporary crowns are needed to replace them, and then formal crowns are worn.

Among the related production technologies of temporary crowns or formal crowns, the first is the direct method. The direct method refers to the complete tooth to be repaired, and the impression is taken before preparing the tooth; small defects can be trimmed with a knife on the impression; if the tooth defect is large, the defect can be restored with wax and then the impression is made; if the tooth defect is too large or there is a tooth defect or uneven teeth, it is necessary to simulate the effect of the restoration through a temporary crown, and a diagnostic model can also be made. On the model, the shape of the missing tooth is restored with wax, and the model is soaked in water for a few minutes, and then the impression of the diagnostic model is obtained; the second is the indirect method, which refers to the operation outside the mouth, which is suitable for various types of restorations. The disadvantage is that the model needs to be perfused, which prolongs the patient's waiting time. The above two methods are time-consuming and have low repeatability.

Summary of the invention

In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a method, device, equipment and medium for generating a dental crown.

The present disclosure provides a method for generating a tooth crown, the method comprising:

Acquire the tooth jaw data of the tooth crown to be generated;

Processing is performed based on the tooth and jaw data to obtain a crown area;

Acquire a target tooth model from a preset tooth model database based on the tooth crown area and the tooth jaw data;

The target tooth model and the tooth jaw data are calculated and processed to obtain a tooth crown.

The present disclosure also provides a tooth crown generation device, the device comprising:

A first acquisition module is used to acquire the tooth and jaw data of the tooth crown to be generated;

A first processing module, used for processing based on the tooth and jaw data to obtain a crown area;

A second acquisition module, configured to acquire a target tooth model from a preset tooth model database based on the tooth crown region and the tooth jaw data;

The second processing module is used to perform calculation processing based on the target tooth model and the tooth and jaw data to obtain a crown.

An embodiment of the present disclosure also provides an electronic device, comprising: a processor; a memory for storing executable instructions of the processor; the processor is used to read the executable instructions from the memory and execute the instructions to implement the crown generation method provided in the embodiment of the present disclosure.

The embodiment of the present disclosure further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to execute the method for generating a dental crown as provided in the embodiment of the present disclosure.

The embodiment of the present disclosure further provides a computer storage medium, wherein the computer storage medium may store a program, and the program executes the method for generating a dental crown as provided in the embodiment of the present disclosure.

The technical solution provided by the embodiment of the present disclosure has the following advantages over the prior art: the crown generation solution provided by the embodiment of the present disclosure obtains the jaw data of the crown to be generated, processes the jaw data to obtain the crown area, obtains the target tooth model from the preset tooth model database based on the crown area and the jaw data, and performs calculation processing based on the target tooth model and the jaw data to obtain the crown. By adopting the above technical solution, the jaw data and/or the target tooth model can be repeatedly modified to obtain a crown that meets the requirements, thereby reducing the crown production cost and improving the crown production efficiency.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

FIG1 is a schematic diagram of a process of a method for generating a tooth crown according to an embodiment of the present disclosure;

FIG2 is a schematic diagram of a process of another method for generating a tooth crown according to an embodiment of the present disclosure;

FIG3 is a schematic diagram of a dental crown provided by an embodiment of the present disclosure;

FIG4a is a schematic diagram of a dental arch morphology provided by an embodiment of the present disclosure;

FIG4b is a schematic diagram of another dental crown provided by an embodiment of the present disclosure;

FIG5 is a schematic structural diagram of a tooth crown generation device provided by an embodiment of the present disclosure;

FIG6 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

FIG1 is a flow chart of a method for generating a tooth crown according to an embodiment of the present disclosure. The method can be performed by a tooth crown generating device, wherein the device can be implemented by software and/or hardware and can generally be integrated in an electronic device. As shown in FIG1 , the method includes:

Step 101: Obtain the dental data of the dental crown to be generated.

Among them, a crown is a special denture used to temporarily replace the real tooth to be repaired to participate in the normal occlusion of the tooth. That is, the crown can be a temporary crown or a formal crown. Usually, the crown consists of an outer crown and an inner crown. The outer crown mainly participates in the normal tooth occlusion function, and the inner crown is used to fix the crown.

The tooth and jaw data include upper and lower tooth and jaw data, which can be The oral cavity is scanned to obtain a three-dimensional digital model of the jaw. The three-dimensional digital model can be a three-dimensional point cloud model or a three-dimensional mesh model. Based on the three-dimensional digital model of the jaw, the curvature field, dental arch morphology and other data of each point therein are obtained. The three-dimensional data of each point in the three-dimensional digital model of the jaw, the curvature field of each point, the dental arch morphology and other data are used as the jaw data.

Step 102: Process the dental data to obtain the crown area.

Among them, the crown area refers to the location area where the crown is placed. In the embodiment of the present disclosure, there are many ways to obtain the crown area based on the dental data, such as through a watershed segmentation algorithm, an image segmentation algorithm based on edge detection, etc., and the specific setting is selected according to the application scenario.

As a specific implementation method, the curvature field of the dental data is calculated, the inner crown marking points and outer crown marking points pre-marked on the dental data are obtained, and the dental data is segmented based on the inner crown marking points, outer crown marking points and the curvature field to obtain the crown area.

Step 103: Obtain a target tooth model from a preset tooth model database based on the crown area and the jaw data.

The target tooth model refers to a model that is close to the actual tooth model.

In the embodiments of the present disclosure, there are many ways to obtain a target tooth model from a preset tooth model database based on the crown area and jaw data. In some implementations, the dental arch morphology is determined based on the jaw data, and the placement position of the candidate tooth model in the tooth model database is determined based on the crown area and the dental arch morphology. After the candidate tooth model is placed based on the placement position, the candidate tooth model and the adjacent teeth are matched, and the matching error is calculated to obtain the candidate tooth model corresponding to the minimum matching error as the target tooth model.

In other embodiments, a candidate tooth model is determined from each tooth model according to the arch morphology difference between each tooth model and the jaw data in the tooth model database, and the placement position of the candidate tooth model is determined according to the jaw data and the crown area. After the candidate tooth model is placed based on the placement position, a matching calculation is performed on the candidate tooth model and the adjacent teeth to obtain the candidate tooth model corresponding to the minimum matching error as the target tooth model.

The above two methods are merely examples of obtaining the target tooth model from a preset tooth model database based on the crown area and jaw data. The embodiments of the present disclosure do not limit the specific implementation method of obtaining the target tooth model from a preset tooth model database based on the crown area and jaw data.

Step 104: Perform calculations based on the target tooth model and the dental data to obtain a crown.

In the embodiments disclosed herein, there are many ways to obtain a crown based on calculations and processing of the target tooth model and the jaw data. In some embodiments, a Boolean difference operation is directly performed on the target tooth model and the jaw data to obtain a crown. In other embodiments, a Boolean difference operation is performed on the target tooth model and the jaw data to obtain a candidate crown, and the undercut area in the inner crown area of the candidate crown is determined, and the outer crown area of the candidate crown and the target area corresponding to the undercut area are removed to obtain the final crown.

The above two methods are merely examples of obtaining a crown by performing calculations based on a target tooth model and jaw data. The embodiments of the present disclosure do not impose specific restrictions on the implementation method of obtaining a crown by performing calculations based on a target tooth model and jaw data.

The crown generation scheme provided by the embodiment of the present disclosure obtains the jaw data of the crown to be generated, processes the jaw data to obtain the crown area, obtains the target tooth model from a preset tooth model database based on the crown area and the jaw data, and performs calculation processing based on the target tooth model and the jaw data to obtain the crown. With the above technical scheme, the jaw data and/or the target tooth model can be repeatedly modified to obtain a crown that meets the requirements, thereby reducing the crown production cost and improving the crown production efficiency.

FIG2 is a flow chart of another method for generating a tooth crown according to an embodiment of the present disclosure. Based on the above embodiment, this embodiment further optimizes the above method for generating a tooth crown. As shown in FIG2 , the method includes:

Step 201: Obtain the dental data of the dental crown to be generated.

Exemplarily, Figure 3 is a schematic diagram of a dental crown provided in an embodiment of the present disclosure. The figure shows a schematic diagram of a dental crown. As shown in Figure 3, the dental crown consists of two parts, an outer crown and an inner crown. The outer crown is mainly involved in completing the normal tooth occlusion function, and the inner crown plays the role of fixing the dental crown.

Step 202, calculate the curvature field of the dental data, obtain the inner crown marking points and outer crown marking points pre-marked on the dental data, and segment the dental data based on the inner crown marking points, outer crown marking points and the curvature field to obtain the crown area.

Specifically, the crown area can be identified by using a curve editing method. In the embodiment of the present disclosure, in order to improve the recognition speed, a watershed algorithm based on curvature is used for initial segmentation. Fine-tune after cutting.

Specifically, the curvature field of the dental data is calculated; wherein the curvature field includes the curvature corresponding to each three-dimensional point, and the curvature usually refers to the minimum curvature; more specifically, a curvature analysis is performed on each three-dimensional point in the three-dimensional dental model corresponding to the dental data to obtain the curvature information of each three-dimensional point, thereby obtaining the curvature field of the dental data.

In the disclosed embodiment, segmentation processing is performed based on the inner crown marker, the outer crown marker and the curvature field to obtain the crown region, including: obtaining the point curvature of each three-dimensional point based on the curvature field, calculating the first distance value based on the point curvature of the inner crown marker and the point curvature of the adjacent three-dimensional points, taking the adjacent three-dimensional points corresponding to the first distance value greater than the preset first distance threshold as the first target marker, calculating the second distance value based on the point curvature of the outer crown marker and the point curvature of the adjacent three-dimensional points, taking the adjacent three-dimensional points corresponding to the second distance value greater than the preset second distance threshold as the second target marker, taking the first target marker as a new inner crown marker to calculate the first distance value, and taking the second target marker as a new outer crown marker to calculate the second distance value, until the first target marker and the second target marker coincide, taking the inner crown marker and the set of all the first target markers as the inner crown region, taking the set of all the outer crown markers and the second target marker as the outer crown region, and taking the inner crown region and the outer crown region as the crown region. Wherein, the first distance threshold and the second distance threshold can be selected and set according to the needs of the application scenario.

Specifically, one or more inner crown marking points and outer crown marking points are pre-marked, for example, the inner crown marking points are Pt1, Pt2 and Pt3, Pt1, Pt2 and Pt3 are the inner crown area, and the outer crown marking points are Pt4, Pt5, Pt6, Pt7, Pt8 and Pt9 are the outer crown area. Pt1-Pt9 are used as pre-marked marking points, i.e., seed points, and are segmented with the calculated curvature field to obtain the crown area.

It should be noted that if the above segmentation results do not meet the needs, they can be manually adjusted to further meet the user's needs.

Step 203: determine the dental arch shape based on the dental jaw data, and determine the placement position of the candidate tooth model in the tooth model database based on the crown area and the dental arch shape.

Step 204: After the candidate tooth model is placed based on the placement position, the candidate tooth model and the adjacent teeth are matched, and the matching error is calculated to obtain the candidate tooth model corresponding to the minimum matching error as the target tooth model.

Among them, dental arch shape refers to square dental arch, pointed round dental arch and elliptical dental arch, etc. The dental arch shape can be determined by the length of the dental arch, the circumference of the dental arch, the inner and outer diameters of the dental arch, the width of the crown, the degree of dental arch crowding, the length and width of the basal bone, etc.

In the embodiment of the present disclosure, before determining the placement position of the tooth model in the tooth model database based on the crown area and the dental arch morphology, it also includes: obtaining a first feature histogram of the tooth model, obtaining a second feature histogram of the dental jaw data, calculating the first feature histogram and the second feature histogram to determine the arch morphology gap, and taking the tooth model with an arch morphology gap less than or equal to a preset gap threshold as a candidate tooth model.

In the embodiment of the present disclosure, a first feature histogram of a tooth model and a second feature histogram of dental data may be extracted through a pre-trained model.

Specifically, for whole-jaw matching and partial-tooth matching, in order to quickly find a suitable tooth model in the database, some information can be pre-calculated to create a tooth feature histogram, and the required teeth can be quickly matched through the histogram. Generally, describing the features of an object often measures an object from different angles. Here, the parameter space for measuring the features of the object is the feature histogram that needs to be constructed, such as S = {s ₁ , s ₂ , s ₃ , ..., s _n }. The similarity between two objects can be constructed by constructing a similarity function such as G(S, E) = G({s ₁ , s ₂ , s ₃ , ..., s _n }, {e ₁ , e ₂ , e ₃ , ..., e _n }). The properties of the selected similarity should be as follows: if S == E, then G takes a maximum value, G(S, E) = G(E, S) and G(S, E) ≥ 0.

Specifically, the characteristic histogram of dental data is mainly described by the arch shape. The arch shape generally has two characteristics: tooth width, tooth length, and arch shape, such as wide, normal, and narrow as shown in Figure 4a; the tooth width is generally taken as the Euclidean distance length of the center of tooth No. 6, and the tooth length is generally taken as the distance projection from the labial surface of the central incisor to the distal surface of tooth No. 6 on the midline of the dental arch. The dental arch shape is generally divided into three types: oval, elliptical, and square. For the convenience of description, the quartic equation is used here: y=ax ⁴ +bx ² +c, and the dental arch curve is fitted according to the geometric center of the crown. For each group of arch shapes (a, b, c), the anterior teeth area generally pays more attention to the arch shape, and the posterior teeth area pays more attention to the tooth width. As well as the bow shape, in actual calculation, the closest groups of data can be quickly matched as candidates by adjusting the appropriate weights.

Specifically, the characteristic histogram of the tooth model shows that the morphology of teeth varies greatly, not only in terms of age, but also in different positions of the same set of teeth. Therefore, the characteristic histogram of teeth has different creation methods for different teeth, and the following describes them in detail for different teeth. For example, the posterior molars are generally composed of the first, second, and third molars, which are similar in shape; the premolars are different from the posterior molars. The premolars are composed of the first premolar and the second premolar; the premolars have obvious alveoli, which divide the teeth into buccal and lingual parts. Here, the height, volume, surface area and other parameters of the lingual and buccal sides can be calculated as histogram features; the canines (tigers) are teeth between the premolars and incisors. The tips of the canines are generally divided into mesial tips, mesial tips, distal tips, and no tips. The canines are more troublesome to process. Here, the symmetry error, the distribution value of the tip on the mesial and distal midline, the tooth volume, the tooth surface area and other parameters are generally calculated as histogram features; the incisors are generally composed of the central incisor and the lateral incisor. Incisors generally have no obvious features, and the volume and surface area and other parameters are generally used as histogram features.

Specifically, crown generation requires a tooth model database and the number of jaws to be generated. The tooth model database includes multiple prefabricated tooth models, and the tooth model database contains multiple complete sets of tooth models. The outer crown shape of the crown is derived from the tooth database; the inner crown shape is generated by referring to the jaw data of the crown to be generated.

Specifically, it is necessary to select a target tooth model that is as close as possible to the actual model tooth. The placement of the candidate model teeth can be determined based on the crown area identified above and the dental arch morphology of the jaw data, and then the two adjacent teeth are precisely matched according to the preset initial matrix, and finally the candidate model tooth with the smallest matching error is selected as the target tooth model based on the matching error.

It should be noted that when there are many teeth in the candidate model, it will be very time-consuming to match them one by one. In order to improve the selection efficiency, the feature histogram of the tooth model and the feature histogram of the dental data can be calculated in advance to determine the gap between the arch shape of the tooth model and the arch shape of the dental data and the gap threshold, so as to screen out some tooth models and further improve the processing efficiency.

Step 205: Perform a Boolean difference operation on the target tooth model and the tooth and jaw data to obtain a tooth crown.

Specifically, there are generally three types of Boolean operations between meshes: Boolean intersection, Boolean union, and Boolean difference.

In the disclosed embodiment, when generating a dental crown, the target tooth model is used to subtract the tooth jaw data, that is, a Boolean difference operation is performed to obtain the dental crown.

Step 206: Obtain the grid area corresponding to the inner crown area of the tooth crown, rotate the undercut direction of the grid area to the vertical direction, and obtain the maximum distance between two three-dimensional points in the grid area in the horizontal direction.

Step 207: determine the undercut area in the grid area based on the maximum distance, remove the outer crown area of the crown and the target area corresponding to the undercut area, and obtain the target crown.

Specifically, the generated crown usually has an undercut area that cannot be brought up, and the crown has a distinct characteristic edge (part A shown in FIG. 4 b ) that requires a smooth transition.

Specifically, in an actual dental crown, the outer crown cannot fit perfectly with the inner crown, and a certain gap must be left. The purpose of this is to fill the gap with glue, which firstly serves as a buffer and secondly ensures the contact water density.

Specifically, the undercut direction of the inner crown area is rotated to the vertical direction (i.e., vertical z-axis), a grid area of the inner crown area is created, the distance from the grid point of the grid area to the inner crown area is calculated, the undercut part is detected, and it is refreshed from top to bottom to remove the undercut part. The target crown obtained by removing the undercut area is shown in the right side of Figure 4b.

The crown generation scheme provided by the disclosed embodiment obtains the dental data of the to-be-generated crown, calculates the curvature field of the dental data, obtains the inner crown marking points and outer crown marking points pre-marked on the dental data, performs segmentation processing on the dental data based on the inner crown marking points, outer crown marking points and curvature field to obtain the crown area, determines the dental arch morphology based on the dental data, determines the placement position of the candidate dental model in the dental model database based on the dental crown area and the dental arch morphology, and after placing the candidate dental model based on the placement position, performs matching processing on the candidate dental model and the adjacent teeth, calculates the matching error, obtains the candidate dental model corresponding to the minimum matching error as the target dental model, performs Boolean difference operation on the target dental model and the dental data to obtain the crown, obtains the grid area corresponding to the inner crown area of the crown, rotates the undercut direction of the grid area to the vertical direction, obtains the maximum distance between two three-dimensional points on the grid area in the horizontal direction, determines the undercut area in the grid area based on the maximum distance, removes the outer crown area of the crown and the target area corresponding to the undercut area, and obtains the target crown. Using the above technical scheme, The existing technology is energy-consuming, and the generation of dental crowns requires users to have relatively skilled experience and high costs. The disclosed embodiment provides a method for digitally generating dental crowns, which has a relatively simple process and can be repeatedly modified, thereby reducing the cost of making temporary dental crowns and improving the efficiency of making temporary dental crowns.

FIG5 is a schematic diagram of the structure of a tooth crown generation device provided by an embodiment of the present disclosure, which can be implemented by software and/or hardware and can generally be integrated into an electronic device. As shown in FIG5 , the device includes:

The first acquisition module 301 is used to acquire the tooth and jaw data of the tooth crown to be generated;

A first processing module 302 is used to process the tooth and jaw data to obtain a crown area;

A second acquisition module 303 is used to acquire a target tooth model from a preset tooth model database based on the tooth crown area and the tooth jaw data;

The second processing module 304 is used to perform calculation processing based on the target tooth model and the tooth and jaw data to obtain a tooth crown.

Optionally, the device further includes:

A third acquisition module is used to acquire a grid area corresponding to the inner crown area of the crown;

A rotation module, used for rotating the undercut direction of the grid area to a vertical direction;

A fourth acquisition module, used for acquiring a maximum distance between two three-dimensional points on the grid area in a horizontal direction;

A determination module, configured to determine an undercut region in the grid region based on the maximum distance;

The removal module is used to remove the outer crown area of the crown and the target area corresponding to the undercut area to obtain a target crown.

Optionally, the first processing module 302 includes:

A calculation unit, used for calculating the curvature field of the dental jaw data;

An acquisition unit, used for acquiring the inner crown marking points and the outer crown marking points pre-marked on the tooth and jaw data;

A processing unit is used to segment the tooth and jaw data based on the inner crown marking points, the outer crown marking points and the curvature field to obtain the crown area.

Optionally, the processing unit is specifically used to:

Acquire the point curvature of each three-dimensional point based on the curvature field;

Calculating a first distance value based on the point curvature of the inner crown marking point and the point curvature of the adjacent three-dimensional point, and taking the adjacent three-dimensional point corresponding to the first distance value greater than a preset first distance threshold as the first target marking point;

Calculate a second distance value based on the point curvature of the outer crown marking point and the point curvature of the adjacent three-dimensional point, and take the adjacent three-dimensional point corresponding to the second distance value greater than the preset second distance threshold as the second target marking point;

The first target marking point is used as a new inner crown marking point to calculate a first distance value, and the second target marking point is used as a new outer crown marking point to calculate a second distance value, until the first target marking point and the second target marking point coincide with each other;

The set of the inner crown marking points and all the first target marking points is taken as the inner crown area, the set of all the outer crown marking points and the second target marking points is taken as the outer crown area, and the inner crown area and the outer crown area are taken as the crown area.

Optionally, the second acquisition module 303 is specifically configured to:

Determine the dental arch morphology based on the dental jaw data;

Determining the placement position of the candidate tooth model in the tooth model database based on the tooth crown area and the dental arch morphology;

After placing the candidate tooth model based on the placement position, matching the candidate tooth model with adjacent teeth and calculating a matching error;

The candidate tooth model corresponding to the minimum matching error is obtained as the target tooth model.

Optionally, the device further includes:

A fifth acquisition module, used for acquiring a first feature histogram of the tooth model;

A sixth acquisition module, used for acquiring a second characteristic histogram of the dental data;

A calculation module, used for calculating the first characteristic histogram and the second characteristic histogram to determine the bow shape difference;

The third processing module is used to take the tooth model whose arch shape difference is less than or equal to a preset difference threshold as the candidate tooth model.

Optionally, the second processing module is specifically used for:

The target tooth model and the tooth data are subjected to a Boolean difference operation to obtain the Tooth crown.

The tooth crown generation device provided in the embodiments of the present disclosure can execute the tooth crown generation method provided in any embodiment of the present disclosure, and has the corresponding functional modules and beneficial effects of the execution method.

The embodiments of the present disclosure also provide a computer program product, including a computer program/instruction, which, when executed by a processor, implements the method for generating a dental crown provided by any embodiment of the present disclosure.

FIG6 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. Referring specifically to FIG6 below, it shows a schematic diagram of the structure of an electronic device 400 suitable for implementing the embodiment of the present disclosure. The electronic device 400 in the embodiment of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. The electronic device shown in FIG6 is merely an example and should not impose any limitations on the functions and scope of use of the embodiment of the present disclosure.

As shown in FIG6 , the electronic device 400 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a storage device 408 to a random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the electronic device 400 are also stored. The processing device 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An input/output (I/O) interface 405 is also connected to the bus 404.

Typically, the following devices may be connected to the I/O interface 405: input devices 406 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 407 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 408 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 409. The communication device 409 may allow the electronic device 400 to communicate wirelessly or wired with other devices to exchange data. Although FIG. 6 shows an electronic device 400 with various devices, it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have alternatively.

In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart may be is implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 409, or installed from the storage device 408, or installed from the ROM 402. When the computer program is executed by the processing device 401, the above functions defined in the crown generation method of the embodiment of the present disclosure are executed.

It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

In some embodiments, the client and server may communicate using any currently known or future developed network protocol such as HTTP (Hyper Text Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include local area networks ("LANs"), broadband A Wide Area Network ("WAN"), an inter-network (eg, the Internet), and a peer-to-peer network (eg, an ad hoc peer-to-peer network), as well as any network currently known or developed in the future.

The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

The above-mentioned computer-readable medium carries one or more programs. When the above-mentioned one or more programs are executed by the electronic device, the electronic device: obtains the tooth and jaw data of the crown to be generated, processes based on the tooth and jaw data to obtain the crown area, obtains the target tooth model from a preset tooth model database based on the crown area and the tooth and jaw data, and performs calculation processing based on the target tooth model and the tooth and jaw data to obtain the crown.

Computer program code for performing the operations of the present disclosure may be written in one or more programming languages or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and/or flow chart, and the combination of the square boxes in the block diagram and/or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, constitute a limitation on the unit itself.

The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip (SOCs), complex programmable logic devices (CPLDs), and the like.

In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

According to one or more embodiments of the present disclosure, the present disclosure provides an electronic device, including:

processor;

a memory for storing instructions executable by the processor;

The processor is used to read the executable instructions from the memory and execute the instructions to implement any of the tooth crown generation methods provided in the present disclosure.

According to one or more embodiments of the present disclosure, the present disclosure provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to execute any of the tooth crown generation methods provided by the present disclosure.

The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the following. The technical solutions formed by the specific combination of the above technical features should also include other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in this disclosure.

In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

Although the subject matter has been described in language specific to structural features and/or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Industrial Applicability

The dental crown generation method provided by the present disclosure can repeatedly modify the dental jaw data and/or the target tooth model to obtain a dental crown that meets the requirements, thereby reducing the cost of dental crown production and improving the efficiency of dental crown production, and has strong industrial applicability.

Claims

A method for generating a tooth crown, comprising:

Acquire the tooth jaw data of the tooth crown to be generated;

Processing is performed based on the tooth and jaw data to obtain a crown area;

Acquire a target tooth model from a preset tooth model database based on the tooth crown area and the tooth jaw data;

The target tooth model and the tooth jaw data are calculated and processed to obtain a tooth crown.
The method for generating a tooth crown according to claim 1, further comprising:

Acquire a grid area corresponding to the inner crown area of the tooth crown;

Rotating the concave direction of the grid area to a vertical direction;

Obtaining the maximum distance between two three-dimensional points on the grid area in the horizontal direction;

determining an undercut region in the grid region based on the maximum distance;

The outer crown area of the crown and the target area corresponding to the undercut area are removed to obtain a target crown.
The method for generating a tooth crown according to claim 1 or 2, characterized in that the step of processing based on the tooth and jaw data to obtain a tooth crown region comprises:

Calculating the curvature field of the dental jaw data;

Acquire the inner crown marking points and the outer crown marking points pre-marked on the tooth and jaw data;

The dental data is segmented based on the inner crown marking points, the outer crown marking points and the curvature field to obtain the dental crown region.
The method for generating a tooth crown according to claim 3, characterized in that the segmentation process based on the inner crown marking point, the outer crown marking point and the curvature field to obtain the tooth crown region comprises:

Acquire the point curvature of each three-dimensional point based on the curvature field;

Calculating a first distance value based on the point curvature of the inner crown marking point and the point curvature of the adjacent three-dimensional point, and taking the adjacent three-dimensional point corresponding to the first distance value greater than a preset first distance threshold as the first target marking point;

The second distance value is calculated based on the point curvature of the outer crown marking point and the point curvature of the adjacent three-dimensional point, and the adjacent three-dimensional point corresponding to the second distance value greater than the preset second distance threshold is regarded as Mark the point for the second target;

The first target marking point is used as a new inner crown marking point to calculate a first distance value, and the second target marking point is used as a new outer crown marking point to calculate a second distance value, until the first target marking point and the second target marking point coincide with each other;

The set of the inner crown marking points and all the first target marking points is taken as the inner crown area, the set of all the outer crown marking points and the second target marking points is taken as the outer crown area, and the inner crown area and the outer crown area are taken as the crown area.
The method for generating a tooth crown according to any one of claims 1 to 4, characterized in that the step of obtaining a target tooth model from a preset tooth model database based on the tooth crown region and the tooth jaw data comprises:

Determine the dental arch morphology based on the dental jaw data;

Determining the placement position of the candidate tooth model in the tooth model database based on the tooth crown area and the dental arch morphology;

After placing the candidate tooth model based on the placement position, matching the candidate tooth model with adjacent teeth and calculating a matching error;

The candidate tooth model corresponding to the minimum matching error is obtained as the target tooth model.
The method for generating a tooth crown according to claim 5, characterized in that before determining the placement position of the tooth model in the tooth model database based on the tooth crown area and the dental arch morphology, it further comprises:

Acquire a first feature histogram of the tooth model;

Acquire a second characteristic histogram of the dental data;

Calculating the first characteristic histogram and the second characteristic histogram to determine the bow shape difference;

The tooth model whose arch shape difference is less than or equal to a preset difference threshold is used as the candidate tooth model.
The method for generating a tooth crown according to any one of claims 1 to 6, characterized in that the step of performing calculations based on the target tooth model and the tooth and jaw data to obtain a tooth crown comprises:

The target tooth model and the tooth jaw data are subjected to a Boolean difference operation to obtain the tooth crown.
A tooth crown generation device, characterized in that it comprises:

A first acquisition module is used to acquire the tooth and jaw data of the tooth crown to be generated;

A first processing module, used for processing based on the tooth and jaw data to obtain a crown area;

A second acquisition module, configured to acquire a target tooth model from a preset tooth model database based on the tooth crown region and the tooth jaw data;

The second processing module is used to perform calculation processing based on the target tooth model and the tooth and jaw data to obtain a crown.
An electronic device, characterized in that the electronic device comprises:

processor;

a memory for storing instructions executable by the processor;

The processor is used to read the executable instructions from the memory and execute the instructions to implement the dental crown generation method described in any one of claims 1-7.
A computer-readable storage medium, characterized in that the storage medium stores a computer program, and the computer program is used to execute the tooth crown generation method described in any one of claims 1-7.