两种金处理方法对镍铬金属烤瓷冠结合强度影响的研究

Effects of different Au preparation techniques on bond strength of porcelain fused to Ni-Cr alloy

目的:研究溅射金介质层和金沉积对Ni-Cr合金与瓷结合强度的影响并探讨其作用机制,为临床应用提供一定的实验依据。方法:采用溅射金介质层和金沉积为Ni-Cr合金与瓷的中间介质,通过剪切试验测试溅射金介质层组和金沉积组金瓷结合强度;扫描电镜观察2组试件界面结合形貌并运用能谱仪检测合金中Ni、Cr元素与瓷内Si、Al元素和Au元素,在界面扩散分布情况,运用XRD对试件表面相组成进行分析。结果:溅射金介质层组金瓷结合强度为(98.095±2.73)MPa,金沉积组为(94.705±2.62)MPa,2组差异无统计学意义(P>0.05)。但溅金组金瓷界面表面颗粒明显细化、分布均匀且清洁度好。结论:溅射金介质层可替代金沉积来增强金瓷结合强度,它是一种理想的改善金瓷结合的工艺。

Objective：To study the effects of sputtering Au and AGC intermediate layer on bonding strength of porcelain fused to Ni-Cr alloy and its mechanism, and to provide data for clinic application. Methods：Modified metal-porcelain interface （Ni-Cr alloy/Vita） by sputtering Au and AGC layer on surface of Ni-Cr, and formed Au in- termediate layer between Ni-Cr/porcelain interface. The bonding strength of metal-porcelain of two groups of specimens with Au intermediate layer was measured by shear bonding test. The interfacial state between Ni-Cr alloy and porcelain was observed by SEM. The ion concentration （Ni, Cr, A1, Si, Au） at interfacial zone was analyzed by EDAX, and surface morphology was analyzed by XRD. Results：The shear bonding strength of sputtering Au group was （29.923± 1. 395） MPa, and AGC group was （19. 997 ± 1. 828） MPa. The statistics showed no significant difference between two groups（ P 〉 0.05 ）, but external granule of sputtering Au group showed obviously smaller uni- formity and cleanliness than AGC group. Conclusion：The sputtering Au intermediate layer can replace AGC to improve the bonding strength of metal-porcelain, which is a good method to porcelain fused to Ni-Cr alloy.