3D Element-libraries of geometric models for removable partial denture

Objectives: Re-developing the integer models of dentition and RPD, which have been accomplished in former studies, we discussed the method to design and establish basic model libraries for removable partial denture. Methods: This study included two steps. First step is to design a reasonable structure of the element libraries of RPD. We cut the integer models of RPD into several parts, which is called “library”, according to the textbook. then we would get the libraries of clasp, retainer, connector, and base of denture. Second step we established these model libraries respectively, with the help of some software for geometric modeling, such as PRO/E, POWERSHAPE, etc. Finally the integer models were cut; elements were trimmed, established and saved in IBL files. We also managed to use these elements by way of “call-in and built-up”. Results: Over 400 elements were established. Tree-structure libraries were made, four main libraries for clasps, retainers, bases and connectors. Each has subdirectories for details, such as occlusal rests, clasps, major or minor connectors, and etc. Conclusions: This research work established 3D geometric model libraries on the idea of database. Individual model can be built much faster comparing with the traditional modeling methods, and easily adopted in teaching and clinical works. Supported by grant of shanghai leading academic discipline fund (T0202)