Objective To evaluate the marginal fit in vitro between selective laser melting deposition basal crowns and cobalt chromi-um alloy casting base crowns.Methods Twenty working dies were created from a single master die and were used to fabricate twenty copings in each as the following groups:A(selective laser melting deposition basal crowns,n=1 0),B(cobalt-chrome alloy basal crown, n=1 0).All the metal copings were fabricated according to manufacturers.The restorations were seated on the master die,and high-reso-lution digital photographs were taken of the marginal area on all four sides.The vertical marginal gap was then measured using a calibra-ted digital software program.Analysis of Variance was used to determine the differences using SPSS 20.0 software package.Results The mean marginal gaps were:group A:(48.20 ±4.61 )μm;group B:(77.90 ±6.26)μm .There was significant difference between two groups.Conclusions The marginal gaps of two different metal copings are clinically acceptable.The selective laser melting deposi-tion copings resulted in smaller marginal gaps than cobalt-chrome copings,which shows that the marginal fit of elective laser melting deposition copings is better than cobalt-chrome copings.%目的：评价选择性激光熔化钴铬合金烤瓷冠和传统铸造钴铬合金烤瓷冠的边缘适合性。方法制作下颌第一磨牙全冠牙体制备标准金属代型1个，复制并灌注石膏模型后，制作选择性激光熔化钴铬合金基底冠和铸造钴铬合金基底冠各10个，依次将其就位于金属标准代型上。在体式显微镜下，对基底冠边缘与金属代型肩台之间的适合度进行观察，用 CCD 数字图像捕捉系统进行成像，并用专业测量软件测量边缘缝隙宽度。最后计算各组10个样本的平均值，采用 SPSS 20．0软件包对数据进行统计学处理。结果选择性激光熔化钴铬合金基底冠和传统铸造钴铬合金基底冠平均边缘缝隙宽度分别为（48．20±4．61）μm、（77．90±6．26）μm，选择性激光熔化钴铬合金基底冠边缘缝隙宽度显著小于传统铸造钴铬合金基底冠（P ＜0．01）。结论2种瓷熔附金属基底冠的边缘适合度均在临床可接受范围内，而选择性激光熔化钴铬合金基底冠边缘适合度显著高于传统铸造钴铬合金基底冠。
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