摇椅形唇弓矫治力系统的三维非线性有限元研究

The three-dimensional nonlinear finite element analysis of force system of the "rocking-chair archwire

目的 通过建立有限元模型对摇椅弓施予牙弓中各个牙的初始力系统进行定性与定量研究。方法 采用有限元分析软件建立摇椅弓的三维有限元模型 ,用非线性分析法分析其施予各牙的力系统。结果 在摇椅弓作用下 ,切牙受龈向力、唇向力、根舌向转矩、近中唇向扭矩 ;尖牙受向力、根舌向转矩、冠远中倾斜力矩及近中唇向扭矩 ;双尖牙受向力、根舌向转矩及近中唇向扭矩 ;磨牙受到龈向力、颊向力、根颊向转矩、近中唇向扭矩。结论 作为连续唇弓 ,摇椅弓施予牙弓中每个牙的初始力系统 ,都是包含多个力及力矩的三维复杂力系。在压低切牙磨牙、升高双尖牙的同时 ,还有引起牙齿轴向扭转及倾斜度变化的趋势。

Objective The purpose of this study was to qualitatively and quantitatively analyze the initial force system of 'rocking-chair archwire' on every tooth. Methods Three-dimensional finite element model of 'rocking-chair archwire' was set up,and nonlinear method was used to analyze the force system. Results The archwire exerted intruding force,labial force,lingual-root torque and mesial-labial moment on incisors; Extruding force,lingual-root torque and mesial-labial moment were applied on caninesand premolars; The archwire also created intruding force,buccal force,buccal-root torque and mesial-labial moment on molars.Conclusions 'rocking-chair archwire' produced a complicated force system . While intruding incisors,molars and extruding premolars. It has a tendency to induce tooth rotation and tipping .