Research And Development Of Virtual Orthodontic System

Traditional metal orthodontics not only has disadvantages such as abrading nonnasality, cleansing and taking off difficulty as well as influencing appearance, but also hardly forecast orthodontic effect in the process of orthodontics. Developing virtual orthodontic system which have process simulation and effect forecast can preplan order, position, range, and force of each stage in tooth movement, accordingly it is have important value in practice use.Firstly, on the basis of analyzing the properties of the STL file, the topological reconstruction method of hierarchy and circularity of data structure are presented. Therefore, the efficiency of following lookup, the space of memory and data processing are greatly improved; A sort of vector approximation searching boundary point method of tissue segmentation is present by analyzing 3D mesh segmentation, and single tooth is divided by citing solid incision method in Rapid Protoyping technique.Secondly, based on the properties of the physical deformation, a simplified mass-spring model is established by analyzing deformed model in common use, then its dynamics characteristic is analyzed, finally, numerical solution of the Lagrange equation is presented.Finally, according to the relationship of orthodontic force and tooth movement, the collision detection algorithm of the tooth movement is investigated by using hierarchy bounding boxes thinking. The real-time processing problem of the collision detection is settled in tooth movement.The subject is developed with VC++6.0 and OpenGL. The system is divided into several modules by using object-oriented programming ideas. The function and implement approach of every module are introduced, and the simulation results are presented. Finally, the shortcomings of the paper are analyzed, and some requests are put forward in the future.