CN-115375720-B - Gum edge line generation method, device, computer equipment and storage medium

CN115375720BCN 115375720 BCN115375720 BCN 115375720BCN-115375720-B

Abstract

The application relates to a gum edge line generation method, a gum edge line generation device, a gum edge line generation computer apparatus, a gum edge line generation storage medium and a gum edge line generation program product. The method comprises the steps of obtaining a single tooth edge line to obtain a tooth gum edge line, calculating a gum contour line according to the tooth gum edge line, calculating a gum edge line according to the gum contour line, and updating the gum edge line according to a tooth displacement data table to obtain an updated gum edge line. The method can automatically cut the dental appliance, improves the production efficiency of the dental appliance and reduces the production cost, and simultaneously improves the accuracy of cutting the gingival margin of the dental appliance, so that a user does not damage the gingiva when wearing the dental appliance, and the comfort of wearing the dental appliance by the user is improved.

Inventors

LIU DAPENG
ZHENG YANFANG
JING ZHANGLEI
TANG XIAOHAN

Assignees

上海麦牙科技有限公司
上海微云实业集团有限公司

Dates

Publication Date: 20260508
Application Date: 20220826

Claims (8)

1. A method of generating a gum edge line, the method comprising: Acquiring a single tooth edge line to obtain a tooth gum edge line; calculating a gum contour line according to the tooth gum edge line, and calculating a gum edge line according to the gum contour line; Updating the gum edge line according to the tooth displacement data table to obtain an updated gum edge line; the calculating the gum contour line according to the tooth gum edge line, the calculating the gum edge line according to the gum contour line comprises: performing spatial arrangement and plane fitting on all the tooth gum edge lines; Processing the gum edge line of the tooth based on the tooth position of the single tooth to obtain the gum contour line; screening the lowest point and the highest point of each tooth in the first direction according to the gum contour line, calculating the height difference between the lowest point and the highest point, and obtaining point cloud data of a tooth model in the height difference; Translating the gum contour in a first direction of the tooth; and traversing the points on the gum in the point cloud data according to the normal vector of each point on the gum contour line after translation, and fitting to form the gum edge line.
2. The method of claim 1, wherein the processing the tooth gum edge line based on the tooth positions of the individual teeth to obtain the gum contour line comprises: extracting and splicing the gingival margin lines of the teeth after the plane fitting based on the tooth positions of the single teeth to obtain an original gingival contour line; and integrating the original gum contour line to obtain the gum contour line.
3. The method of claim 2, wherein the extracting the split of the plane-fitted gum edge line of the teeth based on the tooth positions of the individual teeth to obtain an original gum contour line comprises: taking the lowest point of the tooth gum edge line in the first direction as a characteristic point; forming a triangular area according to the two adjacent characteristic points and concave points of tooth gaps between adjacent teeth; mapping the triangular area based on a three-dimensional model to obtain a triangular area contour line segment; and splicing all the triangular area contour line segments to obtain an original gum contour line.
4. The method of claim 1, wherein updating the gum edge line based on the tooth displacement data table results in an updated gum edge line, comprising: translating and spatially rotating the gum edge line according to the offset of the teeth in the tooth displacement data table; Mapping the translated and spatially rotated gum edge line to a three-dimensional model, traversing the point cloud data of the three-dimensional model, and fitting to obtain an updated gum edge line.
5. The method of any one of claims 1 to 4, wherein the acquiring a single tooth edge line, the tooth gum edge line comprising: calculating to obtain a single tooth edge line by adopting a gradient limit mode based on a single tooth model; Removing noise of the single tooth edge line aiming at the single tooth edge line, and filtering out a dividing line between the tooth and the adjacent tooth; The tooth gum edge line is obtained by uniform distribution of curve vectors.
6. A gum edge line generating device, the device comprising: The acquisition module is used for acquiring a single tooth edge line to obtain a tooth gum edge line; A computing module for computing a gum contour line from the tooth gum edge line, computing a gum edge line from the gum contour line; the updating module is used for updating the gum edge line according to the tooth displacement data table to obtain an updated gum edge line; The computing module is specifically configured to perform spatial arrangement and plane fitting on all the tooth gum edge lines, process the tooth gum edge lines based on tooth positions of single teeth to obtain the gum contour line, screen lowest points and highest points of each tooth in a first direction according to the gum contour line, calculate height differences of the lowest points and the highest points, obtain point cloud data of a tooth model in the height differences, translate the gum contour line in the first direction of the tooth, traverse points on the gum in the point cloud data according to normal vectors of each point on the gum contour line after translation, and perform fitting to form the gum edge line.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.

Description

Gum edge line generation method, device, computer equipment and storage medium Technical Field The present application relates to the field of manufacturing customized products, and in particular, to a gum edge line generating method, apparatus, computer device, storage medium, and computer program product. Background In the production of the invisible dental appliance, trimming of the invisible dental appliance is a necessary procedure. The edge of the invisible appliance needs to be cut according to the gum line of the user. At the same time, multi-stage concealed appliances are produced at different stages of the tooth straightening, that is to say multiple trimming is required. In the traditional technology, the manual scribing mode is adopted for cutting, so that the production efficiency is low, larger errors are easy to generate, and the cutting accuracy is low. Disclosure of Invention In view of the foregoing, it is desirable to provide a gum edge line generation method, apparatus, computer device, computer readable storage medium, and computer program product that improve the efficiency and accuracy of the production of a concealed dental appliance. In a first aspect, the present application provides a gum edge line generation method. The method comprises the following steps: Acquiring a single tooth edge line to obtain a tooth gum edge line; Calculating a gum contour line according to the tooth gum edge line, and calculating a gum edge line according to the gum contour line; updating the gum edge line according to the tooth displacement data table to obtain an updated gum edge line. In one embodiment, calculating a gum contour line from a tooth gum edge line, calculating a gum edge line from the gum contour line, includes: Performing spatial arrangement and plane fitting on all tooth gum edge lines; Processing the gum edge line of the tooth based on the tooth position of the single tooth to obtain a gum contour line; Based on the gingival contour line in combination with the gingival tissue data, a gingival margin line is calculated. In one embodiment, processing a tooth gum edge line based on the tooth positions of a single tooth to obtain a gum contour line includes: based on the tooth positions of the single teeth, extracting and splicing the tooth gum edge lines after plane fitting to obtain an original gum contour line; and integrating the original gum contour line to obtain the gum contour line. In one embodiment, the extraction and splicing of the gingival margin lines of the teeth after the plane fitting based on the tooth positions of the individual teeth to obtain an original gingival contour line comprises: taking the lowest point of the tooth gum edge line in the first direction as a characteristic point; forming a triangular area according to the two adjacent characteristic points and concave points of tooth gaps between adjacent teeth; mapping the triangular area based on a three-dimensional model to obtain a triangular area contour line segment; and splicing all the triangular area contour line segments to obtain an original gum contour line. In one embodiment, calculating the gum edge line based on the gum contour line in combination with the gum tissue data includes: Screening the lowest point and the highest point of each tooth in the first direction according to the gum contour line, calculating the height difference between the lowest point and the highest point, and obtaining point cloud data of a tooth model in the height difference; Translating the gum contour in a first direction of the tooth; And traversing the points on the gum in the point cloud data according to the normal vector of each point on the gum contour line after translation, and fitting to form a gum edge line. In one embodiment, updating the gum edge line according to the tooth displacement data table, resulting in an updated gum edge line, comprises: translating and spatially rotating the gum edge line according to the offset of the teeth in the tooth displacement data table; mapping the translated and spatially rotated gum edge line to the three-dimensional model, traversing the point cloud data of the three-dimensional model, and fitting to obtain an updated gum edge line. In one embodiment, obtaining a single tooth edge line comprises: calculating to obtain a single tooth edge line by adopting a gradient limit mode based on a single tooth model; and removing noise of the edge line of the single tooth aiming at the edge line of the single tooth, filtering out a dividing line between the tooth and the adjacent tooth, and obtaining the gum edge line of the tooth through uniform distribution of curve vectors. In a second aspect, the application also provides a gum edge line generating device. The device comprises: The acquisition module is used for acquiring a single tooth edge line to obtain a tooth gum edge line; the computing module is used for computing a gum contour line according to the tooth gum edge