Tooth root crown fusion method and device combining CBCT and intraoral scanning technology

Abstract

The present application provides a method and device for fusion of tooth root and crown that combines CBCT and intraoral scanning technology. The method includes establishing a CBCT tooth model based on the acquired CBCT data; establishing an intraoral scan crown model and determining the crown surface color according to the acquired intraoral scan data; cutting the intraoral scan crown model and generating a standard crown model based on the preset cutting rules according to the CBCT tooth model, the intraoral scan crown model and the crown surface color; generating a complete tooth model based on the CBCT model and the standard crown model based on the preset model fusion rules. In this way, the tooth model can retain the accuracy of the standard crown model and present the root part according to the CBCT tooth model. The tooth model has the advantages of being intuitive and accurate, which is conducive to orthodontists to specify treatment plans according to the patient's tooth model.

Description

Technical Field

[0001] The present application relates to the field of image processing technology, and more specifically, to a tooth root crown fusion method and device combining CBCT and intraoral scanning technology. Background Art

[0002] In current orthodontic treatment, the treatment plan is usually adjusted in stages according to the patient's tooth correction situation. The plan formulation and effect prediction of each stage mainly rely on the personal experience accumulation of the orthodontist. This treatment method has the defects of unstable treatment effect and low treatment efficiency. The current orthodontic tooth arrangement operation is basically based on the patient's intraoral scanning data, and then digital teeth arrangement is performed based on the three-dimensional data generated by the intraoral scan. The intraoral scanning technology can only obtain the three-dimensional data of the crown part. In the process of digital tooth arrangement, only the crown model can be obtained, and the movement of the tooth root is not intuitive, which poses a great hidden danger. Summary of the invention

[0003] According to an embodiment of the present application, a tooth root crown fusion method and device combining CBCT and intraoral scanning technology are provided.

[0004] In a first aspect of the present application, a tooth root crown fusion method combining CBCT and intraoral scanning technology is provided. The method comprises:

[0005] According to the acquired CBCT data, a CBCT tooth model is established;

[0006] According to the acquired intraoral scanning data, an intraoral scan crown model is established and the crown surface color is determined;

[0007] Based on the preset cutting rules, according to the CBCT tooth model, the oral scan crown model and the crown surface color, the oral scan crown model is cut to generate a standard crown model;

[0008] Based on the preset model fusion rules, a complete tooth model is generated according to the CBCT model and the standard crown model.

[0009] Optionally, establishing an intraoral scan dental crown model and determining the surface color of the dental crown according to the acquired intraoral scan data includes:

[0010] Establish an oral scan crown model based on the intraoral scan data and determine the intraoral image information;

[0011] Based on a region division rule, the oral scanned crown model is divided into a plurality of regions;

[0012] The chromaticity of the crown surface of each area of ​​the oral scanned crown model is determined according to the intraoral image information and a preset chromaticity comparison table.

[0013] Optionally, the area division rule is characterized as:

[0014] Determine edge information of each crown according to the oral scanned crown model;

[0015] According to the edge information of each tooth crown, the labial side and the lingual side of the oral scanned tooth crown model are divided into multiple regions, and each region is a single side of a single tooth crown.

[0016] Optionally, the cutting rule is characterized as:

[0017] Determine a first landmark point according to the CBCT tooth model and the landmark point selection rule, wherein the first landmark point is multiple and all are located in the crown part of the CBCT tooth model;

[0018] Determine a second landmark point according to the oral scanned crown model and the landmark point selection rule, wherein the second landmark point is multiple;

[0019] In the same coordinate system, the first landmark point and the second landmark point are overlapped to determine the first difference between the crown part of the CBCT tooth model and the labial side of each crown in the oral scan crown model, and the second difference between the lingual side;

[0020] Determine a first cutting ratio for the labial side of each tooth crown and a second cutting ratio for the lingual side of each tooth crown according to the crown surface chromaticity and a preset cutting comparison table;

[0021] According to the first difference and the first cutting ratio, the cutting mouth scans the labial side of each crown in the crown model, and according to the second difference and the second cutting ratio, the cutting mouth scans the lingual side of each crown in the crown model to generate a standard crown model.

[0022] Optionally, the labial side surface of each crown in the cut-out scanned crown model includes the labial side surface of each crown in the cut-out scanned crown model along the outer contour shape of the cut-out scanned crown model;

[0023] The lingual side surface of each crown in the cut-mouth-scanned crown model includes the lingual side surface of each crown in the cut-mouth-scanned crown model cut along the outer contour shape of the cut-mouth-scanned crown model.

[0024] Optionally, scanning the labial side of each crown in the crown model at the cutting edge according to the first difference and the first cutting ratio includes:

[0025] Determine a first cutting thickness according to the first difference and the first cutting ratio, and then scan the labial side of each crown in the crown model according to the first cutting thickness cutting opening;

[0026] According to the second difference and the second cutting ratio, the cutting port scans the lingual side of each crown in the crown model, including:

[0027] The second cutting thickness is determined according to the second difference and the second cutting ratio, and the lingual side surface of each crown in the crown model is scanned according to the second cutting thickness cutting opening.

[0028] Optionally, the model fusion rule is characterized as:

[0029] In the same coordinate system, the first mark point and the second mark point are overlapped;

[0030] The overlapping part between the CBCT tooth model and the standard crown model is removed to generate a CBCT root model;

[0031] The CBCT root model and the standard crown model were bridged on the lingual side and processed together to generate a complete tooth model.

[0032] The present application provides a tooth root crown fusion device that combines CBCT and intraoral scanning technology, which can respectively obtain CBCT data and intraoral scanning data, establish a CBCT tooth model according to the CBCT data, establish an intraoral scanning crown model according to the intraoral scanning data and determine the crown surface color, and then based on the preset cutting rules, cut the oral scanning crown model according to the CBCT tooth model, the oral scanning crown model and the crown surface color to generate a standard crown model. This step can reduce the impact of impurities on the tooth surface on the crown model. Finally, based on the preset model fusion rules, a complete tooth model is generated according to the CBCT tooth model and the standard crown model, so that the tooth model can not only retain the accuracy of the standard crown model, but also present the root part according to the CBCT tooth model. The tooth model has the advantages of being intuitive and accurate, which is beneficial for orthodontists to specify treatment plans according to the patient's tooth model.

[0033] In a second aspect of the present application, a tooth root crown fusion device combining CBCT and intraoral scanning technology is provided. The device comprises:

[0034] A first model building module is used to build a CBCT tooth model based on the acquired CBCT data;

[0035] The second model building module is used to build an intraoral scan crown model and determine the crown surface color according to the acquired intraoral scan data;

[0036] A cutting module, for cutting the oral scanned crown model and generating a standard crown model based on a preset cutting rule according to the CBCT tooth model, the oral scanned crown model and the crown surface chromaticity;

[0037] A fusion module is used to generate a complete tooth model according to the CBCT model and the standard crown model based on a preset model fusion rule.

[0038] In a third aspect of the present application, an electronic device is provided, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, the method described above is implemented.

[0039] In a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method according to the first aspect of the present application is implemented.

[0040] It should be understood that the contents described in the Summary of the Invention are not intended to limit the key or important features of the embodiments of the present application, nor are they intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0042] Figure 1 A flowchart of a tooth root crown fusion method combining CBCT and intraoral scanning technology according to an embodiment of the present application is shown;

[0043] Figure 2 A block diagram of a tooth root crown fusion device combining CBCT and intraoral scanning technology according to an embodiment of the present application is shown;

[0044] Figure 3 A schematic diagram of the structure of a terminal device or server suitable for implementing an embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Cone-beam computed tomography (CBCT) has the advantages of low radiation, simple operation, short scanning time, high resolution, and clear display. It can show the structure of hard tooth tissues such as roots, jaws, and alveolar bones layer by layer. However, since patients are often in a cusp-interdigitated position and the cusps of the occlusal surface are interdigitated when taking CBCT, the model reconstructed based on CBCT segmentation is not satisfactory in restoring the anatomical structures of the cusps, pits, grooves, and ridges of the occlusal surface, and cannot reach the clinical accuracy. Oral scanning technology has the advantage of high-precision restoration of the shape of the tooth in the mouth (the crown part), and can scan and obtain soft tissue images such as the gums.

[0047] The present application discloses a tooth root crown fusion method combining CBCT and intraoral scanning technology, which can respectively obtain CBCT data and intraoral scanning data, establish a CBCT tooth model according to the CBCT data, establish an intraoral scanning crown model according to the intraoral scanning data and determine the crown surface color, and then based on a preset cutting rule, cut the oral scanning crown model according to the CBCT tooth model, the oral scanning crown model and the crown surface color to generate a standard crown model. This step can reduce the influence of impurities on the tooth surface on the crown model. Finally, based on the preset model fusion rule, a complete tooth model is generated according to the CBCT tooth model and the standard crown model, so that the tooth model can retain the accuracy of the standard crown model and present the root part according to the CBCT tooth model. The tooth model has the advantages of being intuitive and accurate, which is conducive to orthodontists specifying treatment plans according to the patient's tooth model.

[0048] Figure 1 A flowchart of a tooth root crown fusion method combining CBCT and intraoral scanning technology according to an embodiment of the present application is shown.

[0049] Step S100: Establish a CBCT tooth model based on the acquired CBCT data.

[0050] In an embodiment of the present application, the method of establishing a CBCT tooth model can be to first import CBCT data, then create a mask, binarize the CBCT data according to the tooth threshold, generate tooth two-dimensional data slices, match the two-dimensional data slices and increase the density to generate tooth three-dimensional data, smooth the generated three-dimensional data packet, and then generate a CBCT tooth model. During the smoothing process, the tooth three-dimensional data must be kept consistent with the two-dimensional data contour. This part is a conventional technical means of those skilled in the art and will not be elaborated here.

[0051] Step S200: Building an intraoral scan crown model and determining the crown surface color according to the acquired intraoral scan data.

[0052] In the embodiment of the present application, the method of generating the oral scan crown model can be to establish a three-dimensional model based on the intraoral scan data, then draw a cutting line based on the gingival boundary, segment the crown part and the gingival part, derive the segmented crown part and the three-dimensional data of the crown part, perform density processing on the crown part, and generate the oral scan crown model. This part is a conventional technical means of those skilled in the art and will not be elaborated here.

[0053] In an embodiment of the present application, the method for determining the crown surface chromaticity is to determine the intraoral image information based on the intraoral scanning data, and then divide the oral scan crown model into multiple areas based on the area division rules, and then determine the crown surface chromaticity of each area of ​​the oral scan crown model based on the intraoral image information and a preset chromaticity comparison table.

[0054] The regional division rule can be characterized as: determining the edge information of each crown according to the oral scan crown model, and the edge information can be the boundary between teeth. According to the edge information of each crown, the labial side and the lingual side of the oral scan crown model are divided into multiple regions, and each region is a single side of a single crown.

[0055] Step S300: based on the preset cutting rules, according to the CBCT tooth model, the oral scan crown model and the crown surface color, the oral scan crown model is cut to generate a standard crown model.

[0056] In the embodiment of the present application, the cutting rule is characterized as follows: according to the CBCT tooth model and the landmark point selection rule, a first landmark point is determined, and there are multiple first landmark points, all of which are located in the crown part of the CBCT tooth model. Then, according to the oral scan crown model and the landmark point selection rule, a second landmark point is determined, and there are also multiple second landmark points. Then, in the same coordinate system, the first landmark point and the second landmark point are overlapped so that the crown part of the CBCT tooth model can overlap closely with the oral scan crown model. Since there may be impurities on the surface of the crown model, the thickness of the labial side and the thickness of the lingual side of the oral scan crown model are both greater than the crown part of the CBCT tooth model. Therefore, the first difference between the labial side of the crown part of the CBCT tooth model and each crown in the oral scan crown model, as well as the second difference on the lingual side, can be determined.

[0057] Then, according to the crown surface color and the preset cutting comparison table, the first cutting ratio of the labial side of each crown and the second cutting ratio of the lingual side are determined. The first cutting thickness is determined according to the first difference and the first cutting ratio, and then the labial side of each crown in the crown model is scanned according to the cutting mouth attached after the first cutting. The second cutting thickness is determined according to the second difference and the second cutting ratio, and then the lingual side of each crown in the crown model is scanned according to the second cutting thickness cutting mouth to generate a standard crown model.

[0058] In a specific example, the cutting comparison table can be set based on historical data, and the degree of impurity adhesion on the crown surface can be determined based on the crown surface color, and then the proportion required for cutting can be determined. After determining the cutting proportion, the cutting thickness can be determined based on the thickness difference between the crown part of the CBCT tooth model and the oral scan crown model, so that the oral scan crown model after cutting is closer to the actual data of the patient's teeth.

[0059] In the embodiment of the present application, the landmark point selection rule may be: if the recognition model is a CBCT tooth model, the following steps are performed:

[0060] Step S311, midpoint of the line connecting the midlines of the incisor points of the upper and lower central incisors: determine the central incisor on the CBCT tooth model, flip up and down to obtain the mesial incisal angle of the central incisor and mark it, that is, the mesial point of the tooth body where the mesial central incisor image disappears last, and then determine the midpoint of the line connecting the two points; if they are not in the same plane, calculate the midpoints of the horizontal and vertical distances between the two points, and mark them on the corresponding layer.

[0061] Step S312, mesial contact point of the maxillary and mandibular canines: find the canine on the CBCT tooth model, flip through the CBCT tooth model from top to bottom, and find the point where the canine meets the lateral incisor at the mesial contact point; if there is no contact, the point is the mesial crown width point of the canine.

[0062] Step S313, mesial contact point of the first molars on both sides of the upper and lower jaws: find the first molar on the CBCT tooth model, flip through the CBCT tooth model from top to bottom, and find the point where the mesial contacts with the lateral incisor are the mesial contact points; if there is no contact, the point is the mesial crown width point of the first molar.

[0063] Step S314, the most protruding point of the tooth body on the buccal and labial sides of all teeth's mesiodistal sections: the labial and buccal crown thickness point on the CBCT tooth model, that is, the point closest to the labial side when flipping through the CBCT tooth model from top to bottom.

[0064] Step S315, the most protruding point of the tooth body on the lingual and palatal side of the mesiodistal section of all teeth: the anterior teeth are the lingual protrusion points, that is, the lingual and palatal crown thickness points of the anterior teeth on the CBCT tooth model; the posterior teeth are the lingual and palatal crown thickness points of the anterior teeth on the CBCT tooth model.

[0065] The above are all first landmark points.

[0066] If the identified model is a dental crown model, perform the following steps:

[0067] Step S321, maxillary and mandibular central incisor incision points: locate the maxillary (mandibular) central incisors on the scanned crown model respectively, and find the mesial incisal angles of the left and right maxillary (mandibular) central incisors as the landmark points.

[0068] Step S322, mesial contact point of the canines on both sides of the upper and lower jaws: locate the canine on the oral scan crown model, and find the point where it connects with the lateral incisor at the mesial level as the mesial contact point; if there is no contact, the point is the mesial crown width point of the canine.

[0069] Step S323, mesial contact point of the first molars on both sides of the upper and lower jaws: locate the first molar on the oral scan crown model, and find the point where it connects with the lateral incisor at the mesial contact point; if there is no connection, the point is the mesial crown width point of the first molar.

[0070] Step S324, the most protruding point of the tooth on the labial and buccal sides of all teeth's mesiodistal sections: adjust the oral scan crown model to check the labial and lingual directions of the tooth and locate the most protruding point on the labial side.

[0071] Step S325, the most protruding point of the tooth on the lingual and palatal sides of all teeth's mesiodistal sections: adjust the oral scan crown model to check the labial and lingual directions of the tooth and locate the most protruding point on the lingual side.

[0072] The above are all second landmark points.

[0073] In the embodiment of the present application, when the oral scan crown model is cut, the labial side and the lingual side of each crown in the oral scan crown model can be cut along the outer contour of the oral scan crown model.

[0074] Step S400: Generate a complete tooth model according to the CBCT model and the standard crown model based on a preset model fusion rule.

[0075] In the embodiment of the present application, the model fusion rule is characterized as follows: within the same coordinate system, the first landmark point and the second landmark point are overlapped so that the CBCT tooth model overlaps with the standard crown model, and then the overlapping part of the CBCT tooth model and the standard crown model is cut off to generate a CBCT root model; then the CBCT root model and the standard crown model are bridged on the lingual side and jointly processed to generate a complete tooth model.

[0076] Furthermore, the combined CBCT root model and the standard crown model can be meshed using the Boolean fill command, and the bridged tooth model can be processed into a solid.

[0077] The present application discloses a tooth root crown fusion method combining CBCT and intraoral scanning technology, which can perform cutting processing on the oral scan crown model before fusing the CBCT tooth model with the oral scan crown model to generate a standard crown model, so that the standard crown model part is closer to the patient's actual crown data, thereby improving the accuracy of the fused tooth model.

[0078] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present application.

[0079] The above is an introduction to the method embodiment. The following is a further explanation of the scheme described in this application through an apparatus embodiment.

[0080] Figure 2 The block diagram of a tooth root crown fusion device combining CBCT and intraoral scanning technology according to an embodiment of the present application is shown. The device includes:

[0081] A first model building module is used to build a CBCT tooth model based on the acquired CBCT data;

[0082] The second model building module is used to build an intraoral scan crown model and determine the crown surface color according to the acquired intraoral scan data;

[0083] A cutting module, for cutting the oral scanned crown model and generating a standard crown model based on a preset cutting rule according to the CBCT tooth model, the oral scanned crown model and the crown surface chromaticity;

[0084] A fusion module is used to generate a complete tooth model according to the CBCT model and the standard crown model based on a preset model fusion rule.

[0085] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described module can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0086] Figure 3 A schematic diagram of the structure of an electronic device suitable for implementing the embodiments of the present application is shown.

[0087] like Figure 3 As shown, the electronic device includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 302 or a program loaded from a storage part 308 into a random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the system 300 are also stored. The CPU 301, the ROM 302, and the RAM 303 are connected to each other via a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0088] The following components are connected to the I / O interface 305: an input section 306 including a keyboard, a mouse, etc.; an output section 307 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 308 including a hard disk, etc.; and a communication section 309 including a network interface card such as a LAN card, a modem, etc. The communication section 309 performs communication processing via a network such as the Internet. A drive 310 is also connected to the I / O interface 305 as needed. A removable medium 311, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 310 as needed, so that a computer program read therefrom is installed into the storage section 308 as needed.

[0089] In particular, according to an embodiment of the present application, the above reference flow chart Figure 1 The described process can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a machine-readable medium, and the computer program contains program code for executing the method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 309, and / or installed from the removable medium 311. When the computer program is executed by the central processing unit (CPU) 301, the above-mentioned functions defined in the system of the present application are executed.

[0090] It should be noted that the computer-readable medium shown in the present application 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 application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, 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 appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0091] 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 application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of the code, and the aforementioned module, 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 alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two 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 box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] The units or modules involved in the embodiments described in the present application may be implemented by software or hardware. The units or modules described may also be set in a processor. For example, they may be described as: a processor includes a first model building module, a second model building module, a cutting module, and a fusion module. The names of these units or modules do not, in some cases, constitute limitations on the units or modules themselves. For example, the first model building module may also be described as "a module for building a CBCT tooth model based on the acquired CBCT data."

[0093] As another aspect, the present application further provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable storage medium stores one or more programs, and when the above programs are used by one or more processors to execute a tooth root crown fusion method combining CBCT and intraoral scanning technology described in the present application.

[0094] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the aforementioned application concept. For example, the above features are replaced with (but not limited to) technical features with similar functions applied in the present application.

Claims

1. A tooth root crown fusion method combining CBCT and intraoral scanning technology, characterized in that: include: According to the acquired CBCT data, a CBCT tooth model is established; According to the acquired intraoral scanning data, an intraoral scan crown model is established and the crown surface color is determined; Based on the preset cutting rules, according to the CBCT tooth model, the oral scan crown model and the crown surface color, the oral scan crown model is cut to generate a standard crown model, and the cutting rules are characterized as follows: Determine a first landmark point according to the CBCT tooth model and the landmark point selection rule, wherein the first landmark point is multiple and all are located in the crown part of the CBCT tooth model; Determine a second landmark point according to the oral scanned crown model and the landmark point selection rule, wherein the second landmark point is multiple; In the same coordinate system, the first landmark point and the second landmark point are overlapped to determine the first difference between the crown part of the CBCT tooth model and the labial side of each crown in the oral scan crown model, and the second difference between the lingual side; Determine a first cutting ratio for the labial side of each tooth crown and a second cutting ratio for the lingual side of each tooth crown according to the crown surface chromaticity and a preset cutting comparison table; According to the first difference and the first cutting ratio, the cutting mouth scans the labial side of each crown in the crown model, and according to the second difference and the second cutting ratio, the cutting mouth scans the lingual side of each crown in the crown model to generate a standard crown model; Based on the preset model fusion rules, a complete tooth model is generated according to the CBCT tooth model and the standard crown model.

2. The tooth root crown fusion method combining CBCT and intraoral scanning technology according to claim 1, characterized in that: The step of establishing an intraoral scan dental crown model and determining the surface color of the dental crown according to the acquired intraoral scan data includes: Establish an oral scan crown model based on the intraoral scan data and determine the intraoral image information; Based on a regional division rule, the oral scanned crown model is divided into a plurality of regions; The chromaticity of the crown surface of each area of ​​the oral scanned crown model is determined according to the intraoral image information and a preset chromaticity comparison table.

3. The tooth root crown fusion method combining CBCT and intraoral scanning technology according to claim 2, characterized in that: The area division rule is characterized as follows: Determine edge information of each crown according to the oral scanned crown model; According to the edge information of each tooth crown, the labial side and the lingual side of the oral scanned tooth crown model are divided into multiple regions, and each region is a single side of a single tooth crown.

4. The tooth root crown fusion method combining CBCT and intraoral scanning technology according to claim 1, characterized in that: The labial side surface of each crown in the cut-out scanned crown model includes the labial side surface of each crown in the cut-out scanned crown model along the outer contour shape of the cut-out scanned crown model; The lingual side surface of each crown in the cut-mouth-scanned crown model includes the lingual side surface of each crown in the cut-mouth-scanned crown model cut along the outer contour shape of the cut-mouth-scanned crown model.

5. The tooth root crown fusion method combining CBCT and intraoral scanning technology according to claim 1, characterized in that: The cutting edge scanning of the labial side of each crown in the crown model according to the first difference and the first cutting ratio includes: Determine a first cutting thickness according to the first difference and the first cutting ratio, and then scan the labial side of each crown in the crown model according to the first cutting thickness cutting opening; According to the second difference and the second cutting ratio, the cutting port scans the lingual side of each crown in the crown model, including: The second cutting thickness is determined according to the second difference and the second cutting ratio, and the lingual side surface of each crown in the crown model is scanned according to the second cutting thickness cutting opening.

6. The tooth root crown fusion method combining CBCT and intraoral scanning technology according to claim 1, characterized in that: The model fusion rule is characterized as follows: In the same coordinate system, the first mark point and the second mark point are overlapped; The overlapping part between the CBCT tooth model and the standard crown model is removed to generate a CBCT root model; The CBCT root model and the standard crown model were bridged on the lingual side and processed together to generate a complete tooth model.

7. A tooth root crown fusion device combining CBCT and intraoral scanning technology, characterized in that: include: A first model building module is used to build a CBCT tooth model based on the acquired CBCT data; The second model building module is used to build an intraoral scan crown model and determine the crown surface color according to the acquired intraoral scan data; A cutting module, for cutting the oral scanned crown model and generating a standard crown model based on a preset cutting rule according to the CBCT tooth model, the oral scanned crown model and the crown surface chromaticity; The cutting rule is characterized as: Determine a first landmark point according to the CBCT tooth model and the landmark point selection rule, wherein the first landmark point is multiple and all are located in the crown part of the CBCT tooth model; Determine a second landmark point according to the oral scanned crown model and the landmark point selection rule, wherein the second landmark point is multiple; In the same coordinate system, the first landmark point and the second landmark point are overlapped to determine the first difference between the crown part of the CBCT tooth model and the labial side of each crown in the oral scan crown model, and the second difference between the lingual side; Determine a first cutting ratio for the labial side of each tooth crown and a second cutting ratio for the lingual side of each tooth crown according to the crown surface chromaticity and a preset cutting comparison table; According to the first difference and the first cutting ratio, the cutting mouth scans the labial side of each crown in the crown model, and according to the second difference and the second cutting ratio, the cutting mouth scans the lingual side of each crown in the crown model to generate a standard crown model; A fusion module is used to generate a complete tooth model according to the CBCT tooth model and the standard crown model based on a preset model fusion rule.

8. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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