口腔修復(fù)金屬基底冠CAD關(guān)鍵技術(shù)研究與實現(xiàn).pdf

1、南京航空航天大學(xué)碩士學(xué)位論文口腔修復(fù)金屬基底冠CAD關(guān)鍵技術(shù)研究與實現(xiàn)姓名：聶欣申請學(xué)位級別：碩士專業(yè)：航空宇航制造工程指導(dǎo)教師：程筱勝20080201口腔修復(fù)金屬基底冠 CAD 關(guān)鍵技術(shù)研究與實現(xiàn) ii ABSTRACT In the prosthodontics domain， metal crown is the important component of PFM crown, and therefore the shape

2、 and the precision is particularly is important. The traditional manufacturing process is time-consuming and over labor. With the development of computer technology, developing the computer-aided design software of metal

3、 crown have important value in practice use. Based on clinical science of stomatology and the digital model of STL file, this paper studies relevant algorithms on triangular mesh about designing metal crown. The main inn

4、ovative contributions of this dissertation are as follows： Firstly, reconstructing the topology relation of the discrete surface model efficiently with the red-black tree data structure. Through the points near the real

5、preparation line picked up interactively, this paper use the “tracking on direction” method to determine the initial contour between very two adjacent points, and optimize it to preparation line with Snake energy model.

6、According to closed characteristics of the preparation line, using seed method, the inner surface of crown can be extracted and the border of which will be effectively optimized. This paper using offset method to create

7、outer surface. Two offsetting algorithms are researched. One is basing on normal and the other is basing on implicit surface. How to create implicit surface equation based on radial basis functions is elaborated. After t

8、hat, an improved MC algorithm and optimizing implicit triangular surface can create the high quality outer surface. Because the existing common mesh transition and mesh blend algorithm can not resolving the transition of

9、 inner and outer surface of metal crown. In the analysis of the characteristics of the border and drawing on the ideological of parameters surface, this paper present a transition algorithm which is particularly used in

10、designing a crown. This method is fast and the mesh is smooth, high quality and can meet the medical needs. Based on the algorithms which has been researched and using VC++6.0 and HOOPS library ,this paper developed the