【摘要】 目的　探讨计算机辅助设计和制造 (CAD CAM)切削陶瓷VitaMarkⅡ的遮色能力 ,及此能力与厚度和色系间的关系。方法　VitaMarkⅡA3C 18和A2C 18两个色系的 0 5mm ,1 0mm和 1 5mm厚度的试件样本各 5个 ,覆盖在模拟变色牙的底质上 ,测量其颜色变化。结果　不同厚度和色系的VitaMankⅡ的遮色能力之间存在显著性差异 (P <0 0 1) ,0 5mm ,1 0mm和 1 5mmVitaMarkⅡA3C 18和A2C 18遮色后 ,△E分别为 15 181,17 6 91,19 6 6 7和 15 6 5 3,16 880 ,18 0 0 2。结论　VitaMarkⅡ具有良好的遮色能力 ,且随厚度增加而增加 ;在作为瓷贴面时 ,A2C 18遮色能力略好于A3C 18;而作为嵌体等修复时 ,A3C 18遮色能力更强。更多还原

【Abstract】 Objective The purpose of this study was to evaluate the color masking ability of Computer Aided Design/ Computer Aided Manufacture(CAD/CAM) machining ceramic Vita Mark II, this ability was affected by thickness and shade.Methods Each of 5 specimens of 0.5 mm, 1.0 mm and 1.5 mm Vita Mark II A3C/18 and A2C/18 were prepared and the color change was measured after the substrate simulating stained teeth was covered with the specimen.Results Statistically significant differences (P<0.01) were recorded in the substrates covered with different thickness and shade of Vita Mark II. The color changes (△E) were 15.181, 17.691, 19.667 and 15.653, 16.880, 18.002 after the substrates were covered with 0.5 mm, 1.0 mm and 1.5 mm Vita MarkⅡ A3C/18 and A2C/18.Conclusion As a dental material, CAD/CAM Vita Mark II has high quality to mask the underlying color. Being a veneer, the masking ability with A2C/18 is better than that with A3C/18, but being an inlay, the result is reverse.更多还原