CN116229013A

CN116229013A - Dental crown generation method, device, equipment and medium

Info

Publication number: CN116229013A
Application number: CN202211639689.3A
Authority: CN
Inventors: 江腾飞; 张健; 甄圣贤; 陆炎; 贾颜铭
Original assignee: Shining 3D Technology Co Ltd
Current assignee: Shining 3D Technology Co Ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-06-06

Abstract

The embodiment of the disclosure relates to a method, a device, equipment and a medium for generating dental crowns, wherein the method comprises the following steps: obtaining dental data of a dental crown to be generated, processing the dental data to obtain a dental crown area, obtaining a target dental model from a preset dental model database based on the dental crown area and the dental data, and calculating the dental crown based on the target dental model and the dental data. By adopting the technical scheme, the dental crown meeting the requirements can be obtained by repeatedly modifying the dental data and/or the target tooth model, so that the manufacturing cost of the dental crown is reduced, and the manufacturing efficiency of the dental crown is improved.

Description

Dental crown generation method, device, equipment and medium

Technical Field

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

Background

In recent years, digital oral technology has been rapidly developed, and dental orthodontics has also been increasingly popular. After the user has planted his teeth, there is a period of recovery, in order to solve the patient's eating problems during this period, a temporary crown is needed to replace, and then a formal crown is worn.

In the related generation technology of temporary crowns or formal crowns, the first is a direct method, wherein the direct method refers to that the tooth body to be repaired is complete, and an impression is taken before tooth preparation; small defects can be trimmed with a knife on the stamp; if the tooth defect is larger, the defect part can be used for reproducing the impression by using wax to restore the shape; if the tooth defect is overlarge or the tooth defect exists, and the tooth is irregular, the effect after the temporary crown simulation repair is needed, a diagnosis model can be prepared, the tooth deficiency form is recovered on the model by using wax, the model is soaked in water for a plurality of minutes, and then an impression of the diagnosis model is obtained; the second is the indirect method, which refers to the operation outside the mouth, suitable for various types of repairs, with the disadvantage of requiring an infusion model, which increases the waiting time of the patient. Both of the above methods are relatively time consuming and not highly reproducible.

Disclosure of Invention

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

The embodiment of the disclosure provides a dental crown generation method, which comprises the following steps:

acquiring dental data of a dental crown to be generated;

processing based on the dental data to obtain a dental crown region;

acquiring a target tooth model from a preset tooth model database based on the dental crown region and the dental data;

and performing calculation processing based on the target tooth model and the dental data to obtain the dental crown.

The disclosed embodiments also provide a crown generation device, the device comprising:

the first acquisition module is used for acquiring dental data of the dental crown to be generated;

the first processing module is used for processing based on the dental data to obtain a dental crown area;

the second acquisition module is used for acquiring a target tooth model from a preset tooth model database based on the dental crown area and the dental data;

and the second processing module is used for performing calculation processing based on the target tooth model and the dental data to obtain the dental crown.

The embodiment of the disclosure also provides an electronic device, which comprises: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement a crown generation method according to an embodiment of the present disclosure.

The present disclosure also provides a computer-readable storage medium storing a computer program for executing the crown generation method as provided by the embodiments of the present disclosure.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages: according to the crown generation scheme provided by the embodiment of the disclosure, dental data of a crown to be generated is obtained, processing is performed based on the dental data to obtain a crown region, a target tooth model is obtained from a preset tooth model database based on the dental crown region and the dental data, and computing processing is performed based on the target tooth model and the dental data to obtain the crown. By adopting the technical scheme, the dental crown meeting the requirements can be obtained by repeatedly modifying the dental data and/or the target tooth model, so that the manufacturing cost of the dental crown is reduced, and the manufacturing efficiency of the dental crown is improved.

Drawings

The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.

Fig. 1 is a schematic flow chart of a method for generating a dental crown according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of another method for generating a dental crown according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a dental crown provided in an embodiment of the present disclosure;

FIG. 4a is a schematic illustration of an arch form provided by an embodiment of the present disclosure;

FIG. 4b is a schematic view of another dental crown provided by an embodiment of the present disclosure;

fig. 5 is a schematic structural view of a crown generating device according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.

The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

The names of messages or information interacted between the various devices in the embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

Fig. 1 is a flowchart of a method for generating a dental crown according to an embodiment of the present disclosure, where the method may be performed by a device for generating a dental crown, where the device may be implemented in software and/or hardware, and may be generally integrated in an electronic device. As shown in fig. 1, the method includes:

step 101, acquiring dental data of a dental crown to be generated.

The dental crown is used for temporarily replacing a real tooth to be restored of a person to participate in a special denture for normal occlusion of the tooth, namely, the dental crown can be a temporary crown or a formal crown. Generally, a crown is composed of an outer crown, which mainly participates in accomplishing a normal dental occlusion function, and an inner crown, which is used for fixing the crown.

The dental data comprises upper dental data and lower dental data, a three-dimensional digital model of a dental jaw can be obtained by scanning an oral cavity of a user, the three-dimensional digital model can be a three-dimensional point cloud model or a three-dimensional grid model, the curvature field, the dental arch shape and other data of each point in the three-dimensional digital model of the dental jaw are obtained based on the three-dimensional digital model of the dental jaw, and the three-dimensional data of each point, the curvature field, the dental arch shape and other data of each point in the three-dimensional digital model of the dental jaw are used as dental data.

Step 102, processing based on dental data to obtain a dental crown area.

In the embodiment of the present disclosure, the processing is performed based on dental data, and there are various ways to obtain the dental crown area, such as a watershed segmentation algorithm, an image segmentation algorithm based on edge detection, and the like, which are specifically selected and set according to the application scenario requirements.

As a specific implementation manner, a curvature field of dental data is calculated, an inner crown mark point and an outer crown mark point marked on the dental data in advance are obtained, and dental data is segmented based on the inner crown mark point, the outer crown mark point and the curvature field, so that a dental crown region is obtained.

Step 103, acquiring a target tooth model from a preset tooth model database based on the crown area and the dental data.

Wherein 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 various ways of acquiring a target tooth model from a preset tooth model database based on a crown region and dental data, in some embodiments, a dental arch state is determined based on dental data, a placement position of a candidate tooth model in the tooth model database is determined based on the crown region and the dental arch state, after the candidate tooth model is placed based on the placement position, a matching process is performed on the candidate tooth model and an adjacent tooth, a matching error is calculated, and a candidate tooth model corresponding to the minimum matching error is acquired as the target tooth model.

In other embodiments, candidate tooth models are determined from the tooth models according to the arch-shaped morphology differences of the tooth models and the dental data in the tooth model database, the placement positions of the candidate tooth models are determined according to the dental data and the dental crown area, after the candidate tooth models are placed based on the placement positions, matching calculation is performed on the candidate tooth models and adjacent teeth, and the candidate tooth model corresponding to the minimum matching error is obtained as the target tooth model.

The above two ways are merely examples of acquiring a target tooth model from a preset tooth model database based on the crown area and the dental data, and the embodiments of the present disclosure do not limit a specific implementation manner of acquiring the target tooth model from the preset tooth model database based on the crown area and the dental data.

And 104, performing calculation processing based on the target tooth model and the dental data to obtain the dental crown.

In the embodiment of the disclosure, the method for obtaining the dental crown by performing calculation processing based on the target tooth model and the dental data is various, and in some embodiments, the target tooth model and the dental data are directly subjected to boolean-difference operation to obtain the dental crown; in other embodiments, the target tooth model and the dental data are subjected to a boolean difference operation to obtain candidate crowns, an undercut region in an inner crown region of the candidate crowns is determined, and a target region corresponding to an outer crown region and the undercut region of the candidate crowns is removed to obtain a final crown.

The above two ways are only examples of obtaining a crown by performing calculation processing based on the target tooth model and the dental data, and the embodiments of the present disclosure do not specifically limit the implementation manner of obtaining a crown by performing calculation processing based on the target tooth model and the dental data.

According to the crown generation scheme provided by the embodiment of the disclosure, dental data of a crown to be generated is obtained, processing is performed based on the dental data to obtain a crown region, a target tooth model is obtained from a preset tooth model database based on the dental crown region and the dental data, and computing processing is performed based on the target tooth model and the dental data to obtain the crown. By adopting the technical scheme, the dental crown meeting the requirements can be obtained by repeatedly modifying the dental data and/or the target tooth model, so that the manufacturing cost of the dental crown is reduced, and the manufacturing efficiency of the dental crown is improved.

Fig. 2 is a schematic flow chart of another method for generating a dental crown according to an embodiment of the present disclosure, where the method for generating a dental crown is further optimized based on the above embodiment.

As shown in fig. 2, the method includes:

step 201, acquiring dental data of a dental crown to be generated.

Fig. 3 is a schematic view of a dental crown according to an embodiment of the present disclosure, and shows a schematic view of a dental crown, as shown in fig. 3, the dental crown is composed of two parts, an outer crown and an inner crown, the outer crown mainly participates in completing a normal dental occlusion function, and the inner crown plays a role in fixing the dental crown.

Step 202, calculating curvature fields of dental data, obtaining inner crown marking points and outer crown marking points marked on the dental data in advance, and dividing the dental data based on the inner crown marking points, the outer crown marking points and the curvature fields to obtain dental crown areas.

Specifically, a method of curve editing may be generally used to identify the crown region, and in the embodiment of the present disclosure, in order to increase the identification speed, a curvature-based watershed algorithm is used to perform initial segmentation and then fine adjustment.

Specifically, calculating a curvature field of dental data; wherein the curvature field comprises a curvature corresponding to each three-dimensional point, and the curvature is usually referred to as an extremely small curvature; more specifically, curvature analysis is performed on each three-dimensional point in the three-dimensional dental model corresponding to the dental data, curvature information of each three-dimensional point is obtained, and thus a curvature field of the dental data is obtained.

In an embodiment of the present disclosure, segmentation processing is performed based on an inner crown mark point, an outer crown mark point, and a curvature field, to obtain a crown region, including: the method comprises the steps of obtaining the point curvature of each three-dimensional point based on a curvature field, calculating a first distance value based on the point curvature of an inner crown mark point and the point curvature of an adjacent three-dimensional point, taking the adjacent three-dimensional point corresponding to the first distance value being larger than a preset first distance threshold as a first target mark point, calculating a second distance value based on the point curvature of an outer crown mark point and the point curvature of the adjacent three-dimensional point, taking the adjacent three-dimensional point corresponding to the second distance value being larger than a preset second distance threshold as a second target mark point, calculating the first distance value by taking the first target mark point as a new inner crown mark point, and taking the second target mark point as a new outer crown mark point, calculating a second distance value until the first target mark point and the second target mark point coincide, taking the set of the inner crown mark point and all the first target mark points as an inner crown area, taking the set of all outer crown mark points and the second target mark points as an outer crown area, and taking the inner crown area and the outer crown area as a dental crown area. The first distance threshold and the second distance threshold can be selectively set according to application scene requirements.

Specifically, one or more inner crown mark points and outer crown mark points are marked in advance, for example, the inner crown mark points are Pt1, pt2 and Pt3, the Pt1, pt2 and Pt3 are inner crown areas, the outer crown mark points are Pt4, pt5, pt6, pt7, pt8 and Pt9 are outer crown areas, and Pt1-Pt9 are used as mark points marked in advance, namely seed points, and are subjected to segmentation processing with a calculated curvature field, so that a dental crown area can be obtained.

It should be noted that the above-mentioned segmentation result does not meet the requirement, and can be manually adjusted to further meet the user requirement.

Step 203, determining the tooth arch state based on the dental data, and determining the placement position of the candidate tooth model in the tooth model database based on the crown area and the tooth arch state.

And 204, after the candidate tooth models are placed based on the placement positions, performing matching processing on the candidate tooth models and adjacent teeth, calculating a matching error, and obtaining a candidate tooth model corresponding to the minimum matching error as a target tooth model.

The dental arch shape refers to a square circular dental arch, a cusp circular dental arch, an oval dental arch and the like, and the dental arch shape can be determined by the length of the dental arch, the peripheral diameter of the dental arch, the inner peripheral warp and the peripheral warp of the dental arch, the width of a dental crown and the like, the crowding degree of the dental arch, the length and the width of an abutment bone and the like.

In an embodiment of the present disclosure, before determining the placement position of the tooth model in the tooth model database based on the crown region and the arch state, further comprising: acquiring a first characteristic histogram of a tooth model, acquiring a second characteristic histogram of dental data, calculating the first characteristic histogram and the second characteristic histogram, calculating, determining an arch form gap, and taking the tooth model with the arch form gap smaller than or equal to a preset gap threshold as a candidate tooth model.

In the disclosed embodiments, a first feature histogram of a tooth model, and a second feature histogram of dental data may be extracted by a pre-trained model.

Specifically, for teeth orthognathic matching and partial teeth matching, in order to quickly find a suitable tooth model in the database, a tooth feature histogram may be created by pre-computing some information, and the desired tooth may be quickly matched by the histogram. In general, describing an object feature tends to scale an object from different angles, where the object feature is scaled to obtain a parameter space, even if a feature histogram such as S= { S needs to be constructed ₁ ，s ₂ ，s ₃ ，…，s _a Two objects are close to each other by constructing a similarity function such as G (S, E) =g ({ S) ₁ ，s ₂ ，s ₃ ，…，s _a }，{e ₁ ，e ₂ ，e ₃ ，…，e _a -the selected similarity should have the following properties: if S= E, G takes a maximum value, G (S, E) = G (E, S) and G (S, E) > 0.

In particular, the feature histogram of dental data is primarily described by an arch, which generally has two feature tooth widths, tooth lengths, and arch shapes, such as the wide, normal, and narrow shapes shown in fig. 4 a; the tooth width generally takes the Euclidean distance length of the center of the No. 6 tooth, the tooth length generally takes the distance projection from the labial surface of the central incisor to the distal surface of the No. 6 tooth on the center line of the dental arch, the dental arch is generally divided into three types of oval, ellipse and square, and four-time equation is adopted here for convenience of description: y=ax ⁴ +bx ² +c, fitting an arch curve according to the crown geometric center. For each group of arches (a, b, c), the general front tooth area focuses more on the arches, the rear tooth area focuses more on the tooth width and the arches, and the most similar groups of data can be quickly matched as options to be selected by adjusting proper weights in actual calculation.

Specifically, the feature histogram of the tooth model has a relatively large difference in tooth morphology, which is manifested not only in age, but also in different tooth morphologies on different tooth positions of the same pair of teeth. The feature histogram of the tooth thus has different creation methods for different teeth, which are described in detail below. For example, the post-molar is generally composed of a first molar, a second molar and a third molar, and the shapes of the post-molar and the third molar are relatively close; premolars are different from the premolars and consist of a first premolars and a second premolars; the premolars have obvious tooth sockets which divide the teeth into two parts of a buccal side and a lingual side, wherein parameters such as the heights, the volumes, the surface areas and the like of the lingual side and the buccal side can be calculated as histogram features respectively; the cuspids (tiger teeth) are teeth between premolars and incisors, the cuspids are generally divided into a near cuspid, a middle cuspid, a far cuspid and a no cuspid, the cuspids are more troublesome to process, the symmetry errors are generally calculated, and parameters such as the subsection value of the cuspids in the near and far central lines, the tooth volume, the tooth surface area and the like are used as histogram features; incisors generally consist of a central incisor and a lateral incisor, and generally have no obvious features, and generally have parameters such as volume and surface area as histogram features.

Specifically, crown generation requires a tooth model database and dental data of the crown to be generated. The tooth model database comprises a plurality of tooth models which are prefabricated in advance, and a plurality of complete sets of tooth models exist in the tooth model database. Wherein, the external crown shape source of the dental crown and the dental database; the coping morphology is then generated with reference to the dental data of the crown to be generated.

In particular, it is desirable to screen out a target tooth model that is as close as possible to the actual model tooth. According to the identified crown area and the dental arch shape of the dental data, the placement position of the candidate model teeth can be determined, then the two adjacent teeth are subjected to fine matching according to a preset initial matrix, and finally the candidate model teeth with the smallest matching error are selected as the target tooth model according to the matching error.

It should be noted that, when there are a lot of candidate models, if matching is performed one by one, it is very time-consuming, in order to improve the selection efficiency, the difference between the arch shape of the tooth model and the arch shape of the dental data and the difference threshold value can be determined by pre-calculating the feature histogram of the tooth model and the feature histogram of the dental data, so as to screen out some tooth models, and further improve the processing efficiency.

Step 205, performing boolean difference operation on the target tooth model and the dental data to obtain the dental crown.

Specifically, there are generally three types of boolean operations between grids: boolean cross, boolean union, and boolean difference.

In the embodiment of the present disclosure, when generating a dental crown, the target tooth model is used here to subtract the dental data, i.e., a boolean difference operation is performed to obtain the dental crown.

And 206, acquiring a grid region corresponding to the inner crown region of the dental crown, rotating the concave direction of the grid region to the vertical direction, and acquiring the maximum distance between two three-dimensional points on the grid region in the horizontal direction.

Step 207, determining an undercut region in the grid region based on the maximum distance, and removing a target region corresponding to the undercut region from the outer crown region of the dental crown to obtain the target dental crown.

Specifically, the resulting crowns typically have undercut regions that cannot be brought up and the crowns have distinct characteristic edges (part a shown in fig. 4 b) that require a smooth transition.

Specifically, in an actual dental crown, the outer crown cannot be completely attached to the inner crown, and a certain gap must be left, so that the purpose of the method is to fill the gum, firstly, to play a role in buffering, and secondly, to ensure the contact water density.

Specifically, the undercut direction of the coping region is rotated to the vertical direction (i.e., the vertical z-axis), a mesh region of the coping region is created, the distance from the mesh point of the mesh region to the coping region is calculated, the undercut portion is detected, and the undercut portion is removed by refreshing from above, as shown in the right-hand diagram of fig. 4b, which is a target crown obtained by removing the undercut region.

According to the crown generation scheme provided by the embodiment of the disclosure, dental data of a crown to be generated is obtained, a curvature field of the dental data is calculated, an inner crown mark point and an outer crown mark point marked on the dental data in advance are obtained, the dental data is segmented based on the inner crown mark point, the outer crown mark point and the curvature field to obtain a dental crown region, a dental arch state is determined based on the dental jaw data, the placement positions of candidate tooth models in a dental model database are determined based on the dental crown region and the dental arch state, after the candidate tooth models are placed based on the placement positions, matching processing is performed on the candidate tooth models and adjacent teeth, a matching error is calculated, a candidate tooth model corresponding to the minimum matching error is obtained as a target tooth model, a Boolean difference operation is performed on the target tooth model and the dental data to obtain a dental crown, a grid region corresponding to the inner crown region of the dental crown is obtained, a maximum distance between two three-dimensional points on the grid region in a horizontal direction is obtained, the inverse concave region in the grid region is determined based on the maximum distance, and the target dental crown region corresponding to the outer crown region and the concave region in the dental crown region is removed. By adopting the technical scheme, the technical problems that the prior art consumes more energy, the user needs more skilled experience in generating the dental crowns, and the cost is high are avoided.

Fig. 5 is a schematic structural diagram of a crown generating device according to an embodiment of the present disclosure, where the device may be implemented by software and/or hardware, and may be generally integrated in an electronic device. As shown in fig. 5, the apparatus includes:

a first acquisition module 301 for acquiring dental data of a dental crown to be generated;

a first processing module 302, configured to perform processing based on the dental data to obtain a dental crown region;

a second obtaining module 303, configured to obtain a target tooth model from a preset tooth model database based on the crown area and the dental data;

and a second processing module 304, configured to perform calculation processing based on the target tooth model and the dental data, so as to obtain a dental crown.

Optionally, the apparatus further includes:

a third acquisition module, configured to acquire a mesh region corresponding to an coping region of the dental crown;

the rotating module is used for rotating the inverted concave direction of the grid area to the vertical direction;

a fourth acquisition module, configured to acquire a maximum distance between two three-dimensional points on the grid area in a horizontal direction;

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

and the removing module is used for removing the target area corresponding to the external crown area and the undercut area of the dental crown to obtain the target dental crown.

Optionally, the first processing module 302 includes:

a calculation unit for calculating a curvature field of the dental data;

an acquisition unit for acquiring an coping mark point and an exocoping mark point marked in advance on the dental data;

and the processing unit is used for carrying out segmentation processing on the dental data based on the inner crown marking point, the outer crown marking point and the curvature field to obtain the dental crown region.

Optionally, the processing unit is specifically configured to:

acquiring 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 mark point and the point curvature of the adjacent three-dimensional points, and taking the adjacent three-dimensional points corresponding to which the first distance value is larger than a preset first distance threshold value as first target mark points;

calculating a second distance value based on the point curvature of the outer crown mark point and the point curvature of the adjacent three-dimensional points, and taking the adjacent three-dimensional points corresponding to which the second distance value is larger than a preset second distance threshold value as second target mark points;

calculating a first distance value by taking the first target mark point as a new inner crown mark point and calculating a second distance value by taking the second target mark point as a new outer crown mark point until the first target mark point and the second target mark point coincide;

the method further includes using the set of the coping mark points and all of the first target mark points as coping regions, the set of all of the outer coping mark points and the second target mark points as outer coping regions, and the coping regions and the outer coping regions as the crown regions.

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

determining a dental arch state based on the dental data;

determining a pose location of a candidate tooth model in the tooth model database based on the crown region and the arch state;

after the candidate tooth model is placed based on the placement position, carrying out matching processing on the candidate tooth model and adjacent teeth, and calculating a matching error;

and acquiring a candidate tooth model corresponding to the minimum matching error as the target tooth model.

Optionally, the apparatus further includes:

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

a sixth acquisition module for acquiring a second feature histogram of the dental data;

the computing module is used for computing the first characteristic histogram and the second characteristic histogram and determining an arch shape difference;

and the third processing module is used for taking the tooth model with the arch shape difference smaller than or equal to a preset difference threshold as the candidate tooth model.

Optionally, the second processing module is specifically configured to:

and carrying out Boolean difference operation on the target tooth model and the dental data to obtain the dental crown.

The dental crown generation device provided by the embodiment of the disclosure can execute the dental crown generation method provided by any embodiment of the disclosure, and has the corresponding functional modules and beneficial effects of the execution method.

Embodiments of the present disclosure also provide a computer program product comprising a computer program/instructions which, when executed by a processor, implement the crown generation method provided by any of the embodiments of the present disclosure.

Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure. Referring now in particular to fig. 6, a schematic diagram of an electronic device 400 suitable for use in implementing embodiments of the present disclosure is shown. The electronic device 400 in the embodiments of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and stationary terminals such as digital TVs, desktop computers, and the like. The electronic device shown in fig. 6 is merely an example and should not be construed to limit the functionality and scope of use of the disclosed embodiments.

As shown in fig. 6, the electronic device 400 may include a processing means (e.g., a central processing unit, a graphics processor, etc.) 401, which may 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 means 408 into a Random Access Memory (RAM) 403. In the RAM403, various programs and data necessary for the operation of the electronic device 400 are also stored. The processing device 401, the ROM 402, and the RAM403 are connected to each other by a bus 404. An input/output (I/O) interface 405 is also connected to bus 404.

In general, the following devices may be connected to the I/O interface 405: input devices 406 including, for example, a touch screen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; an output device 407 including, for example, a Liquid Crystal Display (LCD), a speaker, a vibrator, and the like; storage 408 including, for example, magnetic tape, hard disk, etc.; and a communication device 409. The communication means 409 may allow the electronic device 400 to communicate with other devices wirelessly or by wire to exchange data. While fig. 6 shows an electronic device 400 having various means, it is to be understood that not all of the illustrated means are required to be implemented or provided. More or fewer devices may be implemented or provided instead.

In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a non-transitory computer readable medium, the computer program comprising program code for performing the method shown in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via communications device 409, or from storage 408, or from ROM 402. When the computer program is executed by the processing device 401, the above-described functions defined in the crown generation method of the embodiment of the present disclosure are performed.

It should be noted that the computer readable medium described in the present disclosure may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present disclosure, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, fiber optic cables, RF (radio frequency), and the like, or any suitable combination of the foregoing.

In some implementations, the clients, servers 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 a local area network ("LAN"), a wide area network ("WAN"), the internet (e.g., the internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed networks.

The computer readable medium may be contained in the electronic device; or may exist alone without being incorporated into the electronic device.

The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: obtaining dental data of a dental crown to be generated, processing the dental data to obtain a dental crown area, obtaining a target dental model from a preset dental model database based on the dental crown area and the dental data, and calculating the dental crown based on the target dental model and the dental data.

Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including, but not limited to, an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units involved in the embodiments of the present disclosure may be implemented by means of software, or may be implemented by means of hardware. Wherein the names of the units do not constitute a limitation of the units themselves in some cases.

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: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a Complex Programmable Logic Device (CPLD), and the like.

In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, 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 disc 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 comprising:

a processor;

a memory for storing the processor-executable instructions;

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

According to one or more embodiments of the present disclosure, there is provided a computer-readable storage medium storing a computer program for performing any one of the crown generation methods provided by the present disclosure.

The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by persons skilled in the art that the scope of the disclosure referred to in this disclosure is not limited to the specific combinations of features described above, but also covers other embodiments which may be formed by any combination of features described above or equivalents thereof without departing from the spirit of the disclosure. Such as those described above, are mutually substituted with the technical features having similar functions disclosed in the present disclosure (but not limited thereto).

Moreover, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

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

Claims

1. A method of generating a dental crown, comprising:

acquiring dental data of a dental crown to be generated;

processing based on the dental data to obtain a dental crown region;

2. The method of generating a dental crown according to claim 1, further comprising:

acquiring a grid area corresponding to an inner crown area of the dental crown;

rotating the grid region to a vertical direction in an inverted concave 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;

and removing the target area corresponding to the external crown area and the undercut area of the dental crown to obtain the target dental crown.

3. The method according to claim 1, wherein the processing based on the dental data to obtain a crown region comprises:

calculating a curvature field of the dental data;

acquiring an inner crown mark point and an outer crown mark point which are marked on the dental data in advance;

and dividing the dental data based on the inner crown mark points, the outer crown mark points and the curvature field to obtain the dental crown region.

4. A dental crown generation method according to claim 3, wherein the dividing based on the coping mark points, the outer coping mark points, and the curvature field to obtain the dental crown region comprises:

5. The method according to claim 1, wherein the acquiring a target tooth model from a preset tooth model database based on the crown region and the dental data comprises:

determining a dental arch state based on the dental data;

6. The method of generating a dental crown according to claim 5, further comprising, prior to determining the pose of the tooth model in the tooth model database based on the crown region and the arch state:

acquiring a first feature histogram of the tooth model;

acquiring a second characteristic histogram of the dental data;

calculating the first characteristic histogram and the second characteristic histogram, and determining an arch shape form gap;

and taking the tooth model with the arch shape gap smaller than or equal to a preset gap threshold as the candidate tooth model.

7. The method according to claim 1, wherein the performing calculation processing based on the target tooth model and the dental data to obtain a dental crown comprises:

8. A crown generating device, comprising:

9. An electronic device, the electronic device comprising:

a processor;

a memory for storing the processor-executable instructions;

the processor is configured to read the executable instructions from the memory and execute the instructions to implement the crown generation method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that the storage medium stores a computer program for executing the crown generation method according to any one of the preceding claims 1-7.