Method for simulating gum deformation

Abstract

The invention discloses a method for simulating gum deformation. The method mainly includes the steps: determining a control point, a deformation point and a fixed point on a gum model; calculating Laplace expressions of the control point, the deformation point and the fixed point; calculating a rotated value of the Laplace expression of each point by the aid of a Laplace deformation equation anda rotated matrix of each point, performing repeatedly iterating to calculate coordinates of points after deformation; updating the coordinates of the points after deformation into the gum model. According to the method, micro-details of the gum model can be kept in the deformation process of the gum model, and the deformed gum model is more real.

Description

technical field [0001] The invention belongs to the field of dental invisible correction, and relates to a method for simulating deformation of gums. Background technique [0002] With the continuous improvement of people's material living standards, the cleanliness of teeth is regarded as an important part of grooming, and has attracted public attention. Under the trend of the orthodontic market gradually shifting from young to adult, invisible aligners meet people's aesthetic needs in the orthodontic process. Due to the different gingiva shapes of each patient, in the process of computer virtual design of invisible braces, it is necessary to simulate the deformation of each individual's gingiva to achieve personalized customization. In this deformation process, it is of great significance to preserve the detailed information of the patient's own gums. [0003] For the deformation research of the model, there are mainly three ways: finite element model, mass spring model ...

AI Technical Summary

Problems solved by technology

However, after ordinary Laplace deformation, some burrs appear in the small structural parts, which have a great influence on the accuracy and aesthetics.

[0007] There is also a combination of the particle spring model and the deformation of Laplace. For example, Chinese patent, patent number 201610878247.X proposes a gingival deformation simulation method based on the particle spring model of the long axis of the tooth. The method not only needs to calculate the Laplace representation of each point, but also needs to establish a particle motion system, which requires a lot of calculation, and this method does not take the rotation of the Laplace representation into consideration, and the small size of the deformed model Part accuracy may be reduced

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