Modeling method and system of periodontal ligament finite element model

Abstract

The invention discloses a modeling method and system for a periodontal ligament finite element model, and relates to the field of oral mechanics analysis. The modeling method mainly comprises the steps that: a tooth face mesh model and an alveolar bone face mesh model are obtained according to a CT image of a tooth jaw tissue of a patient; according to the tooth surface mesh model and the alveolar bone surface mesh model, an overlapping area between the tooth surface mesh model and the alveolar bone surface mesh model is obtained, and according to the overlapping area, a periodontal membrane solid model is obtained through curved surface processing; the periodontal ligament entity model is processed through grid division to obtain a periodontal ligament body grid model; and the elastic mechanical behavior and the viscous mechanical behavior of the periodontal ligament are defined through the hyperelastic model and the relaxation function model respectively, and a periodontal ligament finite element model obtained after periodontal ligament body mesh model material assignment is obtained. Boolean operation is performed on the tooth surface mesh model and the alveolar bone surface mesh model to obtain the overlapping region, and the periodontal membrane entity model is constructed according to the overlapping region, so that periodontal membrane identification under the condition that the periodontal membrane is difficult to distinguish from other periodontal tissues is realized.

Description

technical field [0001] The invention relates to the field of oral mechanics analysis, in particular to a modeling method and system for a periodontal ligament finite element model. Background technique [0002] In oral biomechanical analysis, finite element analysis is an important research method, which is widely used in orthodontics, jaw restoration and dental implantation. Before using the finite element analysis method to study oral biomechanics, the corresponding finite element model of the dental tissue should be established based on the patient's actual dental tissue structure, including teeth, periodontal ligament, and alveolar bone. Among them, periodontal ligament is a layer of connective fibrous tissue between teeth and alveolar bone, which plays a vital role in stimulating periodontal tissue remodeling and inducing tooth movement. Therefore, in order to correctly understand the tooth movement under the action of orthodontic force, it is necessary to construct a ...

AI Technical Summary

Problems solved by technology

However, as a human oral soft tissue, the periodontal ligament is small in size and thin in thickness, and the gray value of its CT image is also very low compared with teeth and alveolar bone, so it is difficult to distinguish the periodontal ligament from other periodontal tissues. Boundary, modeling efficiency and accuracy need to be improved

In addition, the definition of the material properties of the periodontal ligament generally uses a linear elastic model. However, the periodontal ligament has strong hyper-viscoelastic properties, and inappropriate material property definitions will greatly reduce the accuracy of the periodontal ligament finite element model.

Images