不同粘固剂对 IPS-Empress 2后牙全瓷冠边缘适合性的影响

目的 :探讨不同粘固剂粘固的IPS Empress 2后牙全瓷冠的边缘适合性。方法 :采用印模复制和扫描电镜技术 ,测量磷酸锌粘固剂、PanaviaF树脂粘结系统和Dyracteompomer粘结剂粘固的IPS Empress 2后牙全瓷冠咀嚼模拟试验前后的边缘粘固剂厚度 ,并观察粘固剂表面状态。结果 :3种粘固剂粘固的全瓷冠边缘粘固剂厚度无显著性差异 (P >0 .0 5 ) ;磷酸锌粘固剂粘固的全瓷冠边缘粘固层有明显缺损 ,且咀嚼模拟试验后缺损增多 ,而另两种树脂类粘固剂未见明显缺损。结论 :PanaviaF树脂粘结系统和Dyractcompomer粘结剂粘固的IPS Empress 2后牙全瓷冠具有良好而稳定的边缘适合性

Influence of different luting agents on the marginal adaptation of posterior IPS-Empress 2 all-ceramic crowns

Objective: To evaluate the marginal adaptation of IPS Empress 2 all ceramic crowns cemented onto posterior molars with Panavia F resin luting system, Dyract compomer cement and Harvard zinc phosphate cement.Methods: The three luting agents were used to lute IPS Empress 2 All ceramic crowns on maxillar third molar samples(8 for each agent). The marginal cement film thickness of IPS Empress 2 all ceramic crowns were measured and the margin areas were evaluated before and after chewing simulation using impression replica and SEM technique. Results: There was no significant difference of marginal cement film thickness among the three groups of the agents ( P >0.05); evident defects of cement and increase of the defects after chewing simulation test were found in zinc phosphate group, however there was no evident defect and no obvious change after the test in other two cements groups. Conclusion: IPS Empress 2 all ceramic crowns on posterior molar cemented with Panavia F resin luting system and Dyract compomer cement may result in stable marginal adaptation.