A method of gingival generation for bracketless orthodontics

Abstract

The invention relates to the three-dimensional image processing technology field, especially relates to a gingival generating method used for bracketless orthodontic treatment. The gingival generating method comprises steps that (1) a positive direction of a teeth model is set, and the model is arranged in a forward direction; (2) the teeth model is scanned to acquire the three-dimensional model of the teeth model, and the gingival part and the teeth part of the three-dimensional model, which are required to be kept, are segmented, and segmented edges are sequentially stored; (3) the points of all of the segmented edges are respectively extended along a Z axis negative direction or along the projection directions of the Z axis negative direction of the points of the edges to acquire the intersected points with a specific bottom surface, and therefore the contour line of the bottom surface of the gingival is acquired; (4) uniform sampling is carried out on the contour line of the bottom surface of the gingival, and therefore the width of the bottom surface of the gingival and distances between the bottom surface of the gingival and the segmented edges are acquired, and a number of layers is calculated; (5) the number of the sampling points of the bottom surface is calculated, and the contour points of every layer are sequentially generated according to the calculation result of the step (4); (6) the contour points of every layer are used to reconstruct triangular surfaces, and the gingival is acquired. By adopting the gingival generating method provided by the invention, the original form of the gingival of the key part is maintained, and the number of the triangular surfaces is reduced as much as possible, and then the size of the model is reduced.

Description

technical field [0001] The invention relates to the technical field of three-dimensional image processing, in particular to a method for generating gingiva for bracketless orthodontics. Background technique [0002] In invisible orthodontics without brackets, the three-dimensional data of the teeth is sent to the computer for virtual alignment; during this process and subsequent 3D printing, virtual gums provide support for the teeth. [0003] Among the currently common products, there are two mainstream gingival generation schemes: virtual model and completely real model. The virtual model is a method to completely regenerate the shape of the gums based on the key points or gum lines marked by the user on the teeth. The advantage is that the number and shape of the triangular pieces can be controlled, but because it is completely irrelevant to the patient's real gums, the doctor cannot observe the patient's Gum and periodontal health. In addition, when the patient's gum c...

AI Technical Summary

Problems solved by technology

The virtual model is a method to completely regenerate the shape of the gums based on the key points or gum lines marked by the user on the teeth. The advantage is that the number and shape of the triangular pieces can be controlled, but because it is completely irrelevant to the patient's real gums, doctors cannot observe the patient's gums. Gum and Periodontal Health

In addition, when the patient's gum condition is special, the appliance may squeeze or poke the gum, causing the patient to wear uncomfortable

The completely realistic model is a method to directly convert the patient's plaster model into a virtual gingiva, which is simple and convenient, and truly reflects the patient's gingiva condition, avoiding the situation where the appliance squeezes the patient's gingiva, but the volume of the general plaster model Larger (larger if equipped with a base), resulting in a rapid increase in the number of triangular pieces, and the shape of the triangular pieces cannot be predicted, which may cause unexpected errors

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