Research On The Design Method Of Dental Prosthesis Crown Bridge With Reverse Engineering

The theory and methods of CAD for three-unit fixed partial dental prosthesis crown bridge are studied, which is based on the design technology of single dental prosthesis crown bridge design. An integrated route of the design of crown bridge is put forward. The main work of this paper is as fellows:Firstly, three-dimensional rote scanner is used for the model of tooth based on the feature of tooth crown surface, and the scanning data is reconstructed, to obtain the original data for the design of denture crown bridge. In order to avoid the influence of invisible area, varied orientation is adopted in the process of scanning, and this provides the exact reference for the design of crown bridge.Secondly, the position and dimension of the crown bridge is limited with"integer feature curve", in terms of the features of the nature tooth and the meshed tooth. And the crown bridge occlude surface shape is adjusted by chin feature curve. Then the tangent area of chin is slightly adjusted with method of interference, which makes the bridge and the tooth of chin in the corresponding position.Thirdly, based on the original data from basic tooth and nature tooth, geometry model of the interior and exterior surface of retainers is constructed, keeping the normal touch for retainers and the next tooth, and three-unit fixed crown bridge is built with retainers and connectors.Fourthly, the effect factors for crown bridge is analyzed by means of FEM. Through adjusting the geometry parameters, the shape and dimension of connector is confirmed, and the design optimization is achieved.