牙用烤瓷支架钴铬钼合金的支架及冠适合性的研究

Objective: To investigate the crown and framework fitness of the Co-Cr-Mo alloy, and for clinic use. Methods: ①20 maxillary dentue mould which lose 651∣156, The speciments were grouped equally into ten. Waved and casted with DA9-4 alloys and Reminium 2000 alloys, respectively. Measure the distance of wax and the framework with microscope. And then calculate the amount of shrink after cast. ②Thirty crown speciments, the shape as per-molar after preparation. The speciments were grouped equally into ten. Cast with DA9-4 alloys; Reminium 2000 alloys and VB alloys, respectively. Each speciment was sandblasted with alumina and bonded with Hy-Bond Glassionomer. After bond, the speciments were embed with self- coagulated plastic and cut longitudinal at the middle. Measure 10 spots of the thick between the crown and the speciments with stereomicroscope. Results: The cast shrink between DA9-4 alloys and Reminium 2000 alloys are no significant difference(P>0.05). And the fitness of the crown are: the margin gap of the crown is 71.3±8.34μm, the shoulder gap is 53.4±4.83μm, the axial wall gap is 1.85±8.08μm, the occlusal lift amount is 55.2±9.21μm. Conclusion: The result showed that the alloy has good fitness and can meet the require of clinic.