Objective: To investigate the effect of preoxidation technique on the metal-porcelain bond strength of the Cobalt-Chromium (Co-Cr) alloys porcelain, then provide reference for raising the rehabilitation achievement ratio. Methods: Co-Cr ceramic alloys and VMK95 porcelain powder were used in this study. A total of 60 pull-rod samples -were made and divided into 6 groups according to different preoxidation time for metal-porcelain bond strength measurement; 6 metal-porcelain compounds -were made and also divided into 6 groups for SEM observation and X-ray element energy analysis. Results: The bonding strength -was increased significantly in the groups of preoxidation 5,10 and 15 minutes -were reached the top at 5 minutes. Observed through the electron microscope, in the melt area, the metal-porcelain contact surface appearance was clear, micro-analysis on metal-porcelain interface showed that combination between metal and ceramic were tight and simonized in each other without any crack and bubble. And there was a continuous thin reaction layer. Conclusion: The preoxidation increases the metal-porcelain bond strength of the Co-Cr alloys porcelain, the 5 minutes preoxidation form a -well-distributed oxide film on the surface of the metal, and it's bonding strength reached the top. Prolong the preoxidation time can not increase the bonding strength.%目的:研究预氧化工艺对钴铬合金金-瓷结合界面的影响,以提高钴铬烤瓷合金的金-瓷结合强度.方法:选用BEGO公司钴铬烤瓷合金和VMK 95烤瓷粉,由同一技师按临床比例制成金-瓷棒盘试件60件,金-瓷片试件6件,根据预氧化时间的长短不同将金属试件随机分为6组,分别观察金-瓷结合强度和金-瓷界面的形貌及元素分布情况.结果:预氧化5,10,15 min组钴铬合金的金-瓷结合强度与对照组(不预氧化)相比有显著差异,并在预氧化5 min达到最大值,此后随着预氧化时间的延长,金-瓷结合强度变化不明显.扫描电镜下观察到,预氧化组熔区金-瓷界面形貌清晰,金-瓷间有明显的过渡层,金-瓷界面结合紧密,相互渗透,无裂纹和气泡,在界面处有连续的反应薄层,预氧化5 min时铬元素出现明显的界面附近聚集峰.结论:预氧化工艺提高了钴铬合金金-瓷结合强度,钴铬合金烤瓷界面实现了金-瓷之间的化学结合,预氧化5 min金-瓷结合强度达到最大值,但预氧化时间过长并不能提高钴铬合金的金-瓷结合强度.
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