Experimental Test And Numerical Simulation For Controllable Orthodontic Movement Simulation Based On Wax Model

In orthodontics,the design of treatment plan and the prediction of tooth movement mainly rely on experience of orthodontist,so,it is quite difficult to achieve accurate control on the tooth movement with quantitative data absent.It is an urgent problem to be solved in the present orthodontic research to establish a relationship model between the force applied and the tooth movement.Due to the complex reconstruction process of periodontal tissue and alveolar bone,there is no an effective biomechanical model can detailed describe the process currently.This paper will replace the biomechanical model with the mechanical model of teeth in the wax model to simulate the movement of the teeth.Through the theoretical mechanics knowledge and ABAQUS simulation software,determined the tooth orthodontic force size,direction and the optimum location of orthodontic force loading in the teeth.The main work and achievements are as follows:(1)The basic mechanical properties and viscoelastic effect of wax model in the different temperatures were researched and analyzed by the viscoelastic properties experiment of wax model,and so the necessary material parameters and data for the follow-up to simulation studies were obtained.(2)The wax material constitutive model was selected according to the viscoelastic characteristics of the wax model.Based on the secondary development platform of ABAQUS software,the material UMAT subroutine was programmed with Fortran language.The numerical simulation results coincide with the experimental results and can effectively describe the mechanical behavior of wax model.(3)By building an experimental platform,the resistance characteristics of copper bar in the wax models with different moving patterns were analyzed and studied,establishing the mathematical relationship model of resistance and moving speed of copper bar under differentmovement patterns,laying the foundation for the subsequent implementing orthodontic movement.(4)Finally,a new method of orthodontic movement control was described.By designing and building the three-dimensional finite element model of orthodontic,the feasibility of the orthodontic movement control method was verified based on the numerical calculation and simulation analysis of three mobile control,achieving the desired objectives.