Research On The 3D Model Generation Method Of Invisible Braces

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, in this paper we smooth the teeth model surface which was been adjustment combined with the Laplace operator and Kuwahara filtering operator. The Laplace operator is suitable for the non-acute character region that can rapidly produce the desired overall smoothing effect. While Kuwahara filtering operator fits for the adjustment in the normal direction for the character region of the model, and remove noise while retaining the original characteristics.Secondly, after a wide comparing with other methods, we propose a new method of man-machine interaction to generate transition surface. After adjustment, the teeth model is repaired for the hole and smoothed for the appearance combined with the smooth treatment on the surface.Finally, a new layer on the surface of teeth model is generated after offset for the same displacement for the model after adjustment and repaired. Then the new layer is considered as the outer surface of the braces. Through the arc surface connection, the two-tier surface of the model will generate the braces.The subject is developed with VC++6.0 and OpenGL. The system is divided into several modules, which is realized separately by using object-oriented programming ideas. Finally, all modules will be combined to form an overall orthodontics system. 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.