金泥用于镍铬烤瓷牙的金瓷结合强度及界面电镜观察

Effect of aurum-porcelain blended coat on bond strength and interface of porcelain layer and metal base in Nickel-Chrome porcelain fused metal crown

目的:观察用金泥涂布镍铬合金基底表面对其金瓷结合强度的影响。方法:用电子探针观察涂布金泥后的金瓷界面,并通过剪切强度测定金瓷结合强度。结果:发现金泥-金属间界面光滑无间隙,提示二者间主要为化学结合;金泥- 瓷层间则存在大量的机械锁结。金泥中可见散在微气泡。涂布金泥组的金瓷结合强度低于未涂布金泥组,两组测量值间有显著性差异。结论:本实验条件下涂布金泥使金瓷结合强度降低。

Objective： To observe the effects of aurum - porcelain blended coat on bond strength and interface between porcelain layer and mental base in nickel - chrome porcelain fused metal crown（PFM）. Methods： The interface between porcelain layer and mental base was observed under electronic microscope and the bond strength was examined by shear test. Results： The interface between aurum - porcelain blended coat and metal base was smooth without gaps, which indicated a chemical constitution between them. However, there were some scattered microbubbles between aurum - porcelain blended coat and porcelain layer, which indicated a mechanical constitution between them. Bond strcngth in aurum - porcelain blended coat group was lower than that in control and the difference of the bond strcngth was significant. Conclusion： Aurum - porcelain blended coat will cut down the bond strength between porcelain layer and metal base in PFM.