选择性激光熔融技术成形牙科钴铬合金性能的初步研究

目的:通过测试选择性激光熔融(selective laser melting,SLM)技术制作的牙科钴铬(Co-Cr)合金的部分机械性能、表面显微结构、瓷熔附后的界面情况,以期为该技术的应用提供基础资料。方法:使用SLM技术制作牙科钴铬合金样品,用扫描电镜观察样品的表面形貌和显微结构、测试样品的密度和硬度;将样品经过除气-预氧化处理,用扫描电镜观察样品表面氧化膜的形貌和显微结构;将经过除气-预氧化处理的样品进行瓷熔附,用扫描电镜观察样品金-瓷界面的显微结构。结果:SLM制作的钴铬合金的硬度明显高于铸造钴铬合金;经过除气-预氧化处理后的氧化膜细密均匀;两种方法制作的合金在瓷熔附处理后的金-瓷界面均没有发现明显裂纹。结论:SLM技术比传统铸造技术具有一定的优越性,技术细节有待深入研究。

Basic Study on Selective Laser Melting Technique Formed to Dental Co-Cr Alloy

Objective: To investigate the surface condition and ion releasing behavior of cobalt-chromium(Co-Cr) dental alloy formed by selective laser melting(SLM) technique.Methods: Before porcelain fused sintering process,the surface condition was observed using a scanning electron microscope(SEM),and then the density and hardness of the two alloys were examined.After porcelain fused firing,the interface of porcelain and alloy was observed.Results: SLM technique provide Co-Cr alloy higher hardness than traditional casting method,hwever the density of two alloys were same.After degassing-preoxidation procedure and porcelain fused firing,the interface of the two alloys with porcelain all showed excellent combination.Conclusions: Considering the properties before and after porcelain fused sintering process,SLM technique is suitable to form dental Co-Cr alloy.