Abstract: Objective　To evaluate the shear bond strength（SBS）of porcelain to Co-Cr and Ti-based alloys（Ti6Al4V）fabricated by casting，forging and selective laser melting（SLM）. Methods　Four groups of specimens，10 pieces in each，were prepared by the traditional techniques（casting and forging） and SLM with 10 mm diameter and 1 mm height，labeled as group casting Co-Cr（CC），group forging（DT），group SLM Co-Cr（SC），and group SLM Ti6Al4V（ST）. After sandblasting，surface roughness measurement of these specimens was accomplished by the confocal laser scanning microscope（CLSM），and specific dental porcelains were fused on the surface of Co-Cr and Ti6Al4V. SBS test was conducted，and fracture surface analysis was also performed to determine the failure modes by stereomicroscope. Statistical analysis was conducted to analyze the data. The interface characteristics of the metal-porcelain were determined by field emission scanning electron microscope（FE-SEM）after metallographic preparation. Results　There was no statistical difference in surface roughness（P > 0.05）. Among the specimens，comparison of group CC and SC showed no significant difference in SBS values ［（25.949 ± 2.708）MPa and（26.707 ± 1.559）MPa ］. They were much higher than group DT ［（18.259 ± 1.882）MPa］ and group ST ［（21.504 ± 3.019）MPa ］（P < 0.05），with group DT slightly lower than ST（P < 0.05）. After SBS test，specimens in all the test groups exhibited combined failure. The results of field emission scanning electron microscope（SEM）showed that the metal-porcelain interface of group SC and group CC was tightly integrated，while pores and cracks were occasionally observed in group DT and group ST. Conclusion　The bonding strength between Co-Cr and porcelain produced by SLM technique is comparable to that of traditional casting method，while Ti6Al4V porcelain adhesion can also be improved by SLM，compared with traditional forging method. As a new 3D printing technology，SLM has great potential in the field of prosthodontics.

Key words: selective laser melting, SLM；cobalt-chromium；titanium；bonding strength

摘要： 目的　比较激光选区熔化（selective laser melting，SLM）技术与传统方法制作的钴铬合金（Co-Cr）和钛合金（Ti6Al4V）在金瓷结合性能方面的差异。方法　分别采用传统方法（铸造法和锻造法）和SLM技术制作4组直径10 mm、厚1 mm的圆形片状试件，每组各10个，分别记为铸造Co-Cr（CC）组、锻造Ti6Al4V（DT）组、SLM Co-Cr（SC）组、SLM Ti6Al4V（ST）组。流水下打磨抛光试件，氧化铝喷砂剂喷砂后，激光扫描共聚焦显微镜（CLSM）检测试件表面粗糙度。室温下干燥后分别烧结瓷粉，采用剪切强度测试法测定各组的金瓷结合强度，并进行统计学分析。体视显微镜观察瓷层断裂模式。场发射扫描电镜（FE-SEM）对金瓷结合界面形貌进行分析。结果　各组试件表面粗糙度未见明显差异（P > 0.05）。CC组和SC组的剪切强度无明显差异，分别为（25.949 ± 2.708）MPa和（26.707 ± 1.559）MPa，均显著高于DT组［（18.259 ± 1.882）MPa］和ST组［（21.504 ± 3.019）MPa］（P < 0.05），其中DT组低于ST组（P < 0.05）。各组剪切强度测试后金瓷断裂模式均为混合断裂。FE-SEM下观察显示SC组和CC组金瓷界面结合紧密，DT组和ST组金瓷界面偶见气孔和裂隙。结论　SLM技术制作的Co-Cr金瓷结合强度与传统铸造法相当，SLM技术制作的Ti6Al4V金瓷结合强度明显高于传统锻造法。SLM技术作为一种新型的激光3D打印技术，在口腔修复学领域有极大的应用潜力。

关键词: 激光选区熔化, 钴铬, 钛, 结合强度