Method for extracting, processing and reconstructing point cloud data of dental crown by adopting digital laminar shear

Abstract

The invention provides a method for extracting, processing and reconstructing point cloud data of the dental crown by adopting digital laminar shear, aiming at converting point cloud data into a gray level image with the topological structure. The method comprises the following steps: first, cutting a dental model into a plurality of pieces of three-dimensional stratified data with the same thickness, then, carrying out two dimensionalization on the three-dimensional stratified data, extracting the cross-section data such as the outer contour of the dental crown on the basis, and carrying out data analysis treatment, thus obtaining the gray level image with the topological structure, which is convenient for further generating of data capable of realizing 3D printing. In match with the correcting scheme of an orthodontic doctor, the moving methods including the inclined movement, root control movement, translation movement, rotation movement, vertical movement and the like for the teeth are realized in the digital dental model, and in addition, the method closely combines the dynamic mask imaging technology realizing DLP (facial exposure) 3D printing formation, and the purpose of rapid formation is realized.

Description

technical field [0001] The invention relates to a processing method for extracting section information such as the inner contour of a tooth crown in a jaw model, in particular to a method for extracting, processing and reconstructing point cloud data of a tooth crown by digital layer cutting. [0002] technical background [0003] With the rapid development of computer graphics technology and scanning technology, invisible orthodontic technology without brackets has been widely used in clinical orthodontics. Bracketless invisible aligner is a computer-aided design and production of transparent elastic material movable orthodontic device, which is a series of continuous orthodontic devices, through continuous small-scale movement to achieve the purpose of orthodontic teeth. [0004] When making clear aligners without brackets, the patient's dental model must be digitized first. The digitization of the model is mainly based on the impression of the patient's dental model and t...

AI Technical Summary

Problems solved by technology

However, this kind of operation is too much based on personal experience, and often due to the deviation of manual operation, it will lead to the failure of subsequent production of invisible aligners and even the treatment of patients.

[0006] The general inverse method cannot obtain some data inside the model, and CT and MRI tomography imaging, the thickness of the slice is generally difficult to control, generally at 0.08mm, for the smaller model data such as the crown, some information is difficult to be clear are extracted and cannot be processed