WO2021004346A1

WO2021004346A1 - Method and system for constructing natural tooth library

Info

Publication number: WO2021004346A1
Application number: PCT/CN2020/099685
Authority: WO
Inventors: 于海洋; 刘春煦
Original assignee: 四川大学
Priority date: 2019-07-05
Filing date: 2020-07-01
Publication date: 2021-01-14
Also published as: CN110334444A; CN110334444B

Abstract

A method and system for constructing a natural tooth library. The method comprises the following steps: 1. recording information of a subject; 2. obtaining a digital model; 3. segmenting dentition data; 4. trimming a tooth form; 5. performing mirroring processing; 6. performing tooth anatomical marker area editing; 7. performing dentition data location editing; and 8. importing a natural tooth library. According to the method and system, a natural tooth library is constructed, so as to solve the problem that existing dental restoration digital design has unmatched teeth, is single in form, lack of natural form textures, poor in aesthetics and the like; moreover, the natural tooth library constructed with the present method can be applied in any digital restoration design to design crowns, bridges, veneers, inlays, removable partial dentures, complete dentures and the like; furthermore, matched tooth data can be selected according to personal conditions and characteristics of a patient.

Description

Method and system for constructing natural tooth type database

Technical field

The invention relates to the technical field of biological information, in particular to a method and system for constructing a natural tooth type database.

Background technique

The production of dental prosthesis is a crucial step in the treatment of dental prosthetics. With the widespread use of digital technology in the field of dental prosthetics, the production of artificial teeth for dentures has gradually changed from wax, porcelain, and tooth arrangement to digital design and CNC cutting. With 3D printing, doctors and technicians' cognition and use of tooth shape has also changed from the previous cognition of tooth anatomy to a three-dimensional digital model. Especially in crown and bridge restoration, veneer restoration, implant restoration, and full denture restoration, the application of CAD/CAM is very popular. The rapid development of digital technology in the field of dental prosthesis is due to its intelligence, convenience and efficiency. The overall design process of dentures includes digital scanning models, digital design of restorations, and finally CNC cutting or 3D printing; only simple steps are required The production of the restoration is completed, and most of the procedures are completed by the computer. Compared with the traditional denture processing process that requires more than 30 processing steps, the advantages of digital technology are very obvious.

In the process of digital production of restorations, the only step that requires more human involvement is the digital design of CAD. The corresponding design must be completed before it can be cut or printed. The current digital design does not design the restoration out of thin air in the software, but uses the existing finished tooth data or 3D tooth model to pour it into the design interface, complete the arrangement and appropriate carving processing, and then form the restoration. Basically refer to the tooth profile data to directly design the restoration. All dental professional design software has a tooth profile database (Tooth Library) for designers to use. Therefore, the quality of the tooth profile database is particularly important for restoration design, and the quality and shape of the final solid restoration are also directly affected by the tooth profile database.

However, most dental professional design software's built-in tooth shape database is more suitable for white people, and the number is limited and there are fewer classifications. Moreover, the tooth profile database in mainstream design software is made manually, and lacks the unique texture of natural teeth. Therefore, most of the restorations made by denture processing factories have a single shape and lack individuality. It is difficult to meet the needs of every country, every patient, doctor and technician. Therefore, how to solve the above problems on the basis of ensuring the original digital denture processing flow without increasing the difficulty and design steps of the restoration design, there is an urgent need for a new and personalized natural tooth profile database suitable for the Chinese.

Summary of the invention

The technical problem to be solved by the present invention is that the existing tooth type database lacks universal applicability and lacks the unique texture of natural teeth, which is difficult to meet the needs of various types of patients and doctors. The purpose is to provide a construction of a natural tooth type database. Method and system to solve the above problems.

The present invention is realized through the following technical solutions:

A method for constructing a natural tooth profile database includes the following steps: S1: screening out subjects and recording the subject’s information; S2: scanning all natural teeth of the subject’s upper and lower arches and constructing a three-dimensional based on the scanning results Model; S3: Separate each natural tooth on the three-dimensional model separately, and the segmentation process does not destroy the hard tissue morphology of the tooth; S4: trim the divided natural tooth, remove the soft tissue part around the tooth, and retain Hard tissues of the tooth, and smooth processing of rough triangular faces and scanning defects; S5: mirror image processing of the trimmed tooth on the same side to generate symmetrical tooth data with the same shape and size; S6: according to the type and size of the tooth Edit the dental anatomical landmark area on the symmetrical tooth data to form the tooth data and pontic data; S7: match the tooth data of each tooth with the position of the corresponding tooth in the three-dimensional model to obtain Position arrangement data of each tooth; S8: match the tooth body data, pontic data and position arrangement data with the information of the test subject to form a natural tooth profile database.

When the present invention is applied, a sample of the database is first required, and the formation of the database sample needs to follow certain requirements. Therefore, in the present invention, the subject is first screened out and the subject’s information is recorded for subsequent database generation; then the subject is scanned All the natural teeth of the upper and lower arches of the object, and construct a three-dimensional model based on the scanning results. The construction method can be completed by various existing auxiliary software and tools; then each natural tooth on the three-dimensional model is segmented separately, The model includes soft tissues and tooth hard tissues. In order to facilitate the proposal of soft tissues, the present invention first performs segmentation here for subsequent processing; then the segmented teeth are trimmed. The trimming content includes removing soft tissues, and scanning and constructing Deal with defects in the mold.

As the denture itself is not symmetrical during clinical denture production, it will not only cause unsightly teeth, but also cause some unfavorable physiological reactions after dental implantation. In order to avoid this, the present invention creatively adopts mirroring technology. Mirror the teeth on the same side. The teeth on the same side here refer to the teeth on the left side or the teeth on the right side.

Then according to the type and position of the tooth, the symmetrical tooth data is edited in the dental anatomical landmark area to form the tooth data and pontic data; due to the different anatomical characteristics, the characteristics of the front and rear teeth are different. The meaning is for different types of teeth. The teeth need to be edited differently, and the part of the tooth refers to the crown and pontic. The editing of the two is also different. The database can be more perfect by subdividing the type and part of the tooth.

After the data of all the teeth themselves are extracted, the teeth need to be positioned and the specific three-dimensional coordinates of each tooth can be obtained to achieve the complete information of the entire set of specific combinations of teeth. Finally, the tooth data, pontic data, and position arrangement data are all matched with the information of the test subject to form a natural tooth profile database; the matching here means that the information of the test subject is combined with the tooth obtained from the test subject. Volume data, pontic data, and position arrangement data are mapped into a map. In actual use, when a new user needs dental implants and other dental treatments, the characteristics of the new user can be compared to the subjects in the database Then find the most matching test subject, and then extract the best matching test subject’s dental data, pontic data and position arrangement data to be used as treatment parameters. It can be seen that the database generated by the present invention has excellent application Sex. The invention scans the healthy natural teeth of different groups of people and records their characteristics through digital technology. Through the three-dimensional modeling, digital design, three-dimensional dental analysis, virtual dental sculpture, the specific teeth are performed according to the algorithm required by the design software. Body anatomy editing to complete the construction of the natural tooth profile database. This database can be imported and used in all types of restoration designs according to the conventional design process. It can be directly used for digital design, which improves the efficiency of denture processing and improves the aesthetics of the restoration. Performance, the designed natural tooth profile database has the characteristics, contours and textures of natural teeth.

Further, in step S1: the screening content includes: no dental treatment; no periodontal disease or caries; no developmental deformity; natural teeth have applicable anatomical characteristics; the information of the subject includes records Subject's name, age, gender, race, occupation, birthplace, body type classification, frontal facial type classification, lateral facial type classification, dental arch morphology classification, central incisor morphology classification, occlusal classification and wear classification.

When the present invention is applied, in order to ensure the accuracy and applicability of the data obtained by the database, the test subject needs to be clearly screened. In the present invention, in order to facilitate matching after the database is generated, the recorded information of the test subject is also carried out. clear.

Further, in step S6: the editing of the dental anatomical landmark area includes: coordinates, occlusal surface, incisal margin, contour high-point line, cervical margin, groove fissure, contact area, tooth cusp, cusp apex, ridge, occlusal Area and bottom of pontic.

When the present invention is applied, the dental professional database editing software is used to perform anatomical editing on each tooth data, including coordinates (Axes), occlusal surface (Chewing surface), incisal edge (Incisal edge), and contour high point line (Equator). ), Cervical border, Fissure, Approx contact, Cusp1-5, Cusp tips, Ridge, Desired occlusion area , 12 items at the bottom of the pontic (Bottom); due to the different anatomical characteristics, the characteristics of the front and rear teeth are different.

Further, step S6 includes the following sub-steps: editing the incisal edge of the anterior teeth; editing the occlusal surface, cusp, cusp apex, furrow and occlusal area of the premolar and molar; The 3D model is closed and the bottom of the bridge is edited.

When the present invention is applied, due to different restoration methods, the editing of the crown and the pontic is also different. The pontic needs to close the gap at the root, and then edit the bottom of the pontic, that is, the crest.

Further, step S7 includes the following sub-steps: using a network matching algorithm to match the tooth data of each tooth with the position of the corresponding tooth in the three-dimensional model.

When the present invention is applied, the dental professional database editing software is used to edit the three-dimensional position arrangement of each tooth data, and the mesh matching algorithm is used to match each tooth data with the corresponding tooth of the original dentition data. So as to obtain the three-dimensional position information of the database teeth at every moment.

A construction system for a natural tooth profile database, including: a database unit: used to form, store and call a natural tooth profile database; a screening unit: used to screen out subjects and record the subject’s information and store them in the database unit; 3D modeling unit: used to scan all the natural teeth of the upper and lower arches of the subject and construct a 3D model according to the scanning results; segmentation unit: used to separate each natural tooth on the 3D model and segment it The process does not destroy the hard tissue morphology of the tooth; the trimming unit: used to trim the segmented natural tooth, remove the soft tissue around the tooth, preserve the hard tissue of the tooth, and smoothly treat the rough triangle surface and scanning defects ; Mirror unit: used to mirror the trimmed teeth on the same side to generate symmetrical tooth data with the same shape and size; dental anatomy landmark area editing unit: used to align the symmetrical tooth data according to the type and location of the tooth Edit the dental anatomy landmark area to form tooth data and pontic data; dentition data positioning editing unit: used to match the tooth data of each tooth with the position of the corresponding tooth in the three-dimensional model to obtain The position arrangement data of each tooth is obtained; the database unit matches the tooth body data, pontic data and position arrangement data with the information of the test subject to form a natural tooth shape database.

Further, in the screening unit: the screening content includes: not undergoing any dental treatment; no periodontal disease or caries; no developmental deformities; natural teeth with applicable anatomical characteristics; information about the subject Including recording the subject’s name, age, gender, race, occupation, birthplace, body type classification, frontal facial type classification, lateral facial type classification, dental arch shape classification, central incisor shape classification, occlusal classification and wear classification.

Further, in the dental anatomical landmark area editing unit: the dental anatomical landmark area editing includes: coordinates, occlusal surface, incisal margin, contour high-point line, cervical margin, groove fissure, contact area, tooth tip , Apex, ridge, occlusal area and bottom of pontic.

Further, the dental anatomy landmark area editing unit is used to: edit the incisal edge of the anterior teeth; edit the occlusal surface, cusp, cusp apex, groove and occlusal area of the premolar and molar; for the pontic To close the three-dimensional model and edit the bottom of the bridge.

Further, the dentition data positioning editing unit uses a network matching algorithm to match the dentition data of each tooth with the position of the corresponding tooth in the three-dimensional model.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. A method and system for constructing a natural tooth profile database of the present invention scans healthy natural teeth of different groups of people and records their characteristics through digital technology, and through 3D modeling, digital design, 3D tooth profile analysis, Virtual tooth shape carving, specific tooth anatomy editing according to the algorithm required by the design software, complete the construction of the natural tooth shape database, this database can be imported and used in all types of restoration designs according to the conventional design process, and can be directly used for digitization The design improves the efficiency of denture processing and the aesthetic performance of the restoration. The designed natural tooth profile database has the characteristics, contours and textures of natural teeth;

2. A method and system for constructing a natural tooth profile database of the present invention. All steps and methods such as the use and design of the natural tooth profile database are exactly the same as the traditional digital design, with simple operation and convenient and quick design;

3. A method and system for constructing a natural tooth profile database according to the present invention. The selection of the natural tooth profile database is based on the case and patient's conditions, matching the information of the subject, and selecting the most suitable individualized natural tooth profile for the case ；

4. A method and system for constructing a natural tooth profile database of the present invention. The natural tooth profile database has strong compatibility and can complete the design of restorations in all modules in the design software, including crowns, bridges, veneers, inlays, Removable partial dentures and complete dentures;

5. A method and system for constructing a natural tooth profile database of the present invention solves the problem of the lack of personalized elements in digital restorations, provides more restoration designs, and is more suitable for Asian tooth type selection.

Description of the drawings

The drawings described here are used to provide a further understanding of the embodiments of the present invention, constitute a part of the application, and do not constitute a limitation to the embodiments of the present invention. In the attached picture:

Figure 1 is a schematic diagram of the steps of the present invention;

Figure 2 is a schematic diagram of a three-dimensional model obtained by scanning in the present invention;

Figure 3 is a schematic diagram of the segmented dentition of the present invention;

Figure 4 is a schematic diagram of the modified tooth morphology of the present invention;

Figure 5 is a schematic diagram of mirroring processing of the present invention;

Fig. 6 is a schematic diagram of editing the dental anatomy landmark area of the present invention;

7 is a schematic diagram of positioning and editing dentition data of the present invention;

Figure 8 is a schematic diagram of the application of the natural tooth profile database of the present invention in the digital design of fixed restorations;

Figure 9 is a schematic diagram of the application of the natural tooth profile database of the present invention in the digital design of active restorations;

Figure 10 is a side view of teeth in the shaping database of the present invention;

Figure 11 is a top view of the teeth in the shaping database of the present invention.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the embodiments and drawings. The exemplary embodiments of the present invention and the description thereof are only used to explain the present invention, not As a limitation of the present invention.

Example

As shown in Figure 1, a method and system for constructing a natural tooth profile database of the present invention includes the following steps: S1: screening out subjects and recording the subject’s information; S2: checking all the upper and lower arches of the subject Scan the natural teeth and construct a three-dimensional model based on the scan results; S3: separate each natural tooth on the three-dimensional model separately, and the segmentation process does not destroy the hard tissue morphology of the tooth; S4: trim the segmented natural tooth , Remove the soft tissue around the tooth, retain the hard tissue of the tooth, and smoothly process the rough triangular facets and scanning defects; S5: mirror the trimmed tooth on the same side to generate a symmetrical tooth with the same shape and size Volume data; S6: According to the type and position of the tooth, edit the dental anatomical landmark area to form the dental data and pontic data; S7: Combine the dental data of each tooth with the three-dimensional model Match the position of the corresponding tooth to obtain the position arrangement data of each tooth; S8: match the tooth data, pontic data and position arrangement data with the information of the test subject to form a natural tooth profile database.

In the implementation of this embodiment, a sample of the database is first required, and the formation of the database sample needs to follow certain requirements. Therefore, in the present invention, the subject is first screened out and the subject’s information is recorded for subsequent database generation; then the subject is scanned. All the natural teeth of the upper and lower arches of the test object are constructed, and a 3D model is constructed according to the scanning results. The construction method can be completed by using various existing auxiliary software and tools; then each natural tooth on the 3D model is separately segmented, The three-dimensional model includes soft tissue and tooth hard tissue. In order to facilitate the proposal of soft tissue, the present invention first performs segmentation here for subsequent processing; then the segmented teeth are trimmed. The trimming content includes removing soft tissue, and scanning and Defects in modeling are dealt with.

In order to further illustrate the working process of this embodiment, in step S1: the screening content includes: no dental treatment; no periodontal disease or caries; no developmental deformity; natural teeth have applicable anatomical characteristics; The information of the subject includes recording the subject’s name, age, gender, race, occupation, place of birth, body type, frontal facial type, lateral facial type, dental arch morphology, central incisor morphology, and occlusion And wear classification.

During the implementation of this embodiment, in order to ensure the accuracy and applicability of the data obtained by the database, the test subject needs to be clearly screened. In the present invention, in order to facilitate matching after the database is generated, the recorded information of the test subject is also processed. Made clear.

In order to further illustrate the working process of this embodiment, in step S6: the dental anatomical landmark area editing includes: coordinates, occlusal surface, incisal margin, contour high-point line, cervical margin, groove fissure, contact area, tooth tip , Apex, ridge, occlusal area and bottom of pontic.

In the implementation of this embodiment, the dental professional database editing software is used to perform anatomical editing on each tooth data, including coordinates (Axes), occlusal surface (Chewing surface), incisal edge (Incisal edge), and contour high point line ( Equator, Cervical border, Fissure, Approx contact, Cusp1-5, Cusptips, Ridge, Desired occlusion area ), 12 items at the bottom of the bridge (Bottom); due to different anatomical characteristics, the characteristics of the front and rear teeth are different.

In order to further illustrate the working process of this embodiment, step S6 includes the following sub-steps: editing the incisal margin of the anterior teeth; editing the occlusal surface, cusp, cusp apex, furrow and occlusal area of the premolar and molar ; For the bridge, close the three-dimensional model and edit the bottom of the bridge.

During the implementation of this embodiment, due to the different restoration methods, the editing of the crown and the pontic is also different. The pontic needs to close the gap at the root, and then edit the bottom of the pontic, that is, the crest.

In order to further explain the working process of this embodiment, step S7 includes the following sub-steps: using a network matching algorithm to match the tooth data of each tooth with the position of the corresponding tooth in the three-dimensional model.

In the implementation of this embodiment, the professional dental database editing software is used to edit the three-dimensional position arrangement of each tooth data, and the mesh matching algorithm is used to match each tooth data with the corresponding tooth of the original dentition data. , So as to obtain the three-dimensional position information of the database teeth at every moment.

In order to further illustrate the working process of this embodiment, in the screening unit: the screening content includes: no dental treatment; no periodontal disease or caries; no developmental deformity; natural teeth have applicable anatomical characteristics ; The information of the subject includes recording the subject’s name, age, gender, race, occupation, birthplace, body type classification, front facial type classification, lateral facial type classification, dental arch morphology classification, central incisor morphology classification, Occlusion classification and wear classification.

In order to further illustrate the working process of this embodiment, in the dental anatomical landmark area editing unit: the dental anatomical landmark area editing includes: coordinates, occlusal surface, incisal edge, contour high point line, neck edge, Fissures, contact areas, cusps, cusps, ridges, occlusal areas, and pontic bottoms.

In order to further explain the working process of this embodiment, the dental anatomy landmark area editing unit is used to: edit the incisal margin of the anterior teeth; perform the occlusal surface, cusp, cusp apex, furrow and fissure of the premolar and molar Editing of the occlusal area; for the bridge, the three-dimensional model is closed and the bottom of the bridge is edited.

To further illustrate the working process of this embodiment, the dentition data positioning editing unit uses a network matching algorithm to match the dentition data of each tooth with the position of the corresponding tooth in the three-dimensional model.

In order to specifically illustrate the working process of this embodiment, the construction method includes the following steps:

(1) Record object information: Screen out subjects who have not undergone any dental treatment, periodontal disease, caries, developmental deformities, and natural teeth with good anatomical characteristics, and record their name, age, sex, Race, occupation, birthplace, body type classification, frontal facial type classification, lateral facial type classification, dental arch shape classification, central incisor shape classification, occlusal classification, and wear classification.

(2) Acquire a digital model: use the 3shape intraoral scanner to scan all the natural teeth of the upper and lower arches, and then export them to a common 3D format file. Figure 2 shows a schematic diagram of obtaining a digital model.

(3) Segmentation of dentition data: Use the cutting tool of the 3D design software Materialise Magics to segment each natural tooth on the dentition without destroying any hard tissue morphology of the tooth. The cutting gap is set to 0, each The teeth are kept separately. Figure 3 shows a schematic diagram of the segmented dentition.

(4) Trimming the morphology of the tooth: without destroying any hard tissue morphology of the tooth, use the 3D design software exocad DentalCAD's engraving tool to remove the soft tissue around the tooth, retain the hard tissue, and take some rough triangular faces And scan defects for smooth processing. Figure 4 shows a schematic diagram of the modified tooth morphology.

(5) Mirror image processing: Use the mirror image tool in the 3D design software Materialise Magics to mirror the teeth on the same side to obtain symmetrical teeth data with exactly the same shape and size. Figure 5 shows a schematic diagram of mirroring processing.

(6) Tooth type anatomy landmark area editing: use the dental professional database editing software ToothModelEditor to edit the anatomy of each tooth data, including coordinates (Axes), occlusal surface (Chewing surface), and incisal edge (Incisal edge) , Equator, Cervical border, Fissure, Approx contact, Tooth tip (Cusp1-5), Tooth tip (Cusp tips), Ridge (Ridge), Desired occlusion area, bottom of pontic (Bottom) 12 items; due to different anatomical characteristics, the characteristics of the front and rear teeth are different, in which the incisal margin is edited only for the anterior teeth, while the occlusal surface, cusp and apex Only the premolars and molars can be edited in the area of sulcus, fissure and occlusal. Due to the different restoration methods, the editing of crown and pontic is also different. The pontic needs to close the gap at the root, and then fix the bottom of the pontic, which is the crest. Department for editing. Figure 6 shows the editing diagram of the dental anatomy landmark area.

(7) Positioning and editing of dentition data: use the professional dental database editing software exocad DentalCAD to edit the three-dimensional position arrangement of each tooth data, and use the mesh matching algorithm to convert each tooth data to the original dentition data The corresponding tooth body is matched, so as to obtain the three-dimensional position information of the database tooth shape at each moment. Figure 7 shows a schematic diagram of dentition data positioning and editing.

(8) Import of natural tooth type database: After all editing is completed, we can obtain three kinds of data, namely tooth data, pontic data and position arrangement data, and put each file of these three kinds of data in three folders , The folder is named after the retrieval information, and then the tooth data is stored in the "library-teeth" folder, the pontics data is stored in the "library-pontics" folder, and the positional data is stored in the "library-metadata" file In the folder; during design, select the name of the named folder in the tooth profile database selection interface and load, then the tooth profile data can be loaded.

The corresponding natural tooth type database can be obtained through the technical solutions provided in the embodiments, and all tooth type three-dimensional model data in the natural tooth type database can be used in all design dental restoration modules of the software.

As shown in Figure 10 and Figure 11, the tooth data of the natural tooth profile database is shown in the figure. It can be clearly seen from the figure that in this embodiment, the designed natural tooth profile database has the characteristics, contours and contours of natural teeth. Texture.

In order to illustrate the effect of the use of the database generated in this embodiment, the database is produced by any of the foregoing embodiments method, and the use method specifically includes the following content:

(1) Application in the digital design of fixed restoration: After completing the design of the edge line and the bonding gap, the natural tooth database can be loaded, and then follow the conventional design steps to arrange the teeth, calculate the edges, adjust the contacts and occlusion, Finally, it is refined to form the final restoration. Figure 8 shows the application of the natural tooth profile database in the digital design of fixed restorations.

(2) Application in the digital design of active restorations: load the teeth directly into the natural tooth profile database, and then arrange the teeth, adjust the occlusion, adjust the adjacent area, and draw the base area to complete the final restoration. Figure 9 shows the application of the natural tooth profile database in the digital design of active restorations.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in further detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection, any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention.

Claims

A method for constructing a natural tooth type database is characterized in that it comprises the following steps:

S1: Screen out the subject and record the subject’s information;

S2: Scan all natural teeth of the subject's upper and lower arches and construct a three-dimensional model according to the scan results;

S3: Separate each natural tooth on the three-dimensional model separately, and the segmentation process does not destroy the hard tissue morphology of the tooth;

S4: Trimming the segmented natural tooth, removing the soft tissue around the tooth, retaining the hard tissue of the tooth, and smoothing the rough triangular facets and scanning defects;

S5: Perform mirror image processing on the trimmed tooth on the same side to generate symmetric tooth data with the same shape and size;

S6: According to the type and position of the tooth, edit the dental anatomical landmark area to form the dental data and pontic data;

S7: Match the tooth body data of each tooth with the position of the corresponding tooth body in the three-dimensional model to obtain the position arrangement data of each tooth;

S8: Match the tooth data, pontic data and position arrangement data with the information of the test subject to form a natural tooth profile database.
The method for constructing a natural tooth type database according to claim 1, wherein in step S1:

The screening content includes: no dental treatment; no periodontal disease or caries; no developmental deformities; natural teeth with applicable anatomical characteristics;

The information of the subject includes recording the subject’s name, age, gender, race, occupation, place of birth, body type classification, front facial type classification, lateral facial type classification, dental arch morphology classification, central incisor morphology classification, occlusion Classification and wear classification.
The method for constructing a natural tooth type database according to claim 1, wherein in step S6:

The editing of the dental anatomical landmark area includes: coordinates, occlusal surface, incisal edge, contour high point line, neck edge, groove fissure, contact area, tooth cusp, tooth apex, ridge, occlusal area and pontic bottom.
The method for constructing a natural tooth type database according to claim 3, wherein step S6 includes the following sub-steps:

Edit the margin of the front teeth;

Edit the occlusal surface, cusp, apex, furrow and occlusal area of premolars and molars;

For the bridge, the three-dimensional model is closed and the bottom of the bridge is edited.
The method for constructing a natural tooth type database according to claim 1, wherein step S7 includes the following sub-steps:

A network matching algorithm is used to match the tooth data of each tooth with the position of the corresponding tooth in the three-dimensional model.
A construction system of a natural tooth type database, which is characterized in that it comprises:

Database unit: used to form, store and call the natural tooth type database;

Screening unit: used to screen out the subject and record the subject’s information and store it in the database unit;

Three-dimensional modeling unit: used to scan all natural teeth of the upper and lower arches of the subject and construct a three-dimensional model according to the scanning results;

Segmentation unit: It is used to segment each natural tooth on the three-dimensional model separately, and the segmentation process does not destroy the hard tissue morphology of the tooth;

Trimming unit: used to trim the segmented natural tooth, remove the soft tissue around the tooth, preserve the hard tissue of the tooth, and smoothly process the rough triangular facets and scanning defects;

Mirror unit: used to mirror the trimmed tooth on the same side to generate symmetric tooth data with the same shape and size;

Tooth anatomy landmark area editing unit: used to edit the dental anatomy landmark area of the symmetrical tooth data according to the type and position of the tooth to form tooth data and pontic data;

The dentition data positioning and editing unit: used to match the tooth body data of each tooth with the position of the corresponding tooth body in the three-dimensional model to obtain the position arrangement data of each tooth;

The database unit matches the dental data, pontic data and position arrangement data with the information of the test subject to form a natural dental database.
The construction system of a natural tooth type database according to claim 6, wherein in the screening unit:

The screening content includes: no dental treatment; no periodontal disease or caries; no developmental deformities; natural teeth with applicable anatomical characteristics;

The information of the subject includes recording the subject’s name, age, gender, race, occupation, place of birth, body type classification, front facial type classification, lateral facial type classification, dental arch morphology classification, central incisor morphology classification, occlusion Classification and wear classification.
The system for constructing a natural tooth type database according to claim 6, wherein in the dental anatomical landmark area editing unit:

The editing of the dental anatomical landmark area includes: coordinates, occlusal surface, incisal edge, contour high point line, neck edge, groove fissure, contact area, tooth cusp, tooth apex, ridge, occlusal area and pontic bottom.
The construction system of a natural tooth type database according to claim 8, wherein the tooth type anatomical landmark area editing unit is used for:

Edit the margin of the front teeth;

Edit the occlusal surface, cusp, apex, furrow and occlusal area of premolars and molars;

For the bridge, the three-dimensional model is closed and the bottom of the bridge is edited.
The system for constructing a natural tooth profile database according to claim 6, wherein the dentition data positioning and editing unit uses a network matching algorithm to compare the dental data of each tooth with the corresponding tooth in the three-dimensional model. Body position to match.