Method for constructing realistic dentition model

Abstract

The invention provides a method for constructing a realistic dentition model, and belongs to the field of oral medicine. The method comprises the following steps: (1) acquiring a three-dimensional dental model and at least three intraoral illuminations, wherein the intraoral illuminations are color images of the oral cavity; (2) obtaining an optimal camera posture corresponding to each intraoral illumination by utilizing the three-dimensional dental model and the intraoral illuminations; and (3) mapping each intraoral illumination to the three-dimensional dental model according to the optimalcamera attitude corresponding to each intraoral illumination, finding a texture joint on the three-dimensional dental model, and then eliminating the texture joint to obtain a realistic dentition model. According to the method, the color dentition model with the real image texture can be semi-automatically constructed by using a small amount of simple manual operation, and the texture image on thedental model has no obvious distortion, dislocation or seam, so that a better simulation effect can be obtained; and by utilizing the method disclosed by the invention, the simulation effect of the dental model is improved in oral medical auxiliary systems such as dental aesthetic repair and the like, and manual intervention is reduced.

Description

technical field [0001] The invention belongs to the field of stomatology, and in particular relates to a method for constructing a realistic dentition model. Background technique [0002] With the development of stomatology, people's requirements for digital technology are getting higher and higher. Among them, the more demanding digital display and simulation effect is one of the current key research. Tooth color is of the utmost importance in dental restorations. Existing studies have found that tooth color is one of the important factors that affect the patient's aesthetic restoration results. Many patients expressed their interest in having realistic textures on digital restorations. In order to obtain a realistic color dentition model, one method is to obtain it directly through an expensive intraoral scanner. Obviously, this method is too expensive and will increase the operating costs of dental medical institutions. Moreover, the dentition models with colored text...

AI Technical Summary

Problems solved by technology

This method needs to mark a large number of feature points, the operation process is cumbersome, and requires high professional skills of personnel. The accuracy of the marked points directly affects the final registration accuracy. If the marked points do not correspond accurately, the final mapping result will be There is obvious misalignment

[0006] The second problem is how to perform multimodal data registration between 2D intraoral photos and 3D dentition models in the case of limited features

Unlike regular buildings or other objects with complete contours, the dentition model includes two parts, soft tissue and bone. In the multi-view-based 2D / 3D registration process, the 2D dental model projection image and the intraoral point, contour, There are too few similar features such as shape, and it is impossible to perform feature matching or calculate similarity measures through a single feature to achieve fully automatic registration, which will increase the difficulty of multi-modal data registration

[0007] The third problem is that when multiple photos are used for projection texture mapping, there will be obvious seams, which will affect the simulation effect

Because the intraoral photos taken at different angles have great differences in lighting conditions, colors, contrast, brightness and other characteristics, so when the intraoral photos correspond to the texture coordinates of the dental model, there will be obvious seams between adjacent textures, which means Seriously affect the final simulation effect

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