目的测量Ceramco、Shofu、Noritake和Vita等4个品牌22种不同颜色的乳光瓷样本的透明度、对比率和遮色效果3个透射参数,并比较其相关性,为正确选择及使用乳光瓷粉提供参考。方法在反射模式和不同背景下,采用分光光谱仪测量乳光瓷样本的L*、a*、b*值,计算色差、透明度参数(TP)和遮色效果(ME)。在400～750 nm光谱范围内测量样本的光反射率,计算对比率(CR)。TP、ME和CR等3个透射参数分别按品牌和颜色因素用完全随机设计的方差分析进行分析,组间比较用SNK-q检验(α=0.05);3个参数的相关性分析采用直线相关与回归分析和多元线性回归分析(α=0.05)。结果相同品牌不同颜色乳光瓷透射参数的均数总体不等或不全相等(P<0.05)。遮色效果与透明度参数、对比率与透明度参数、遮色效果与对比率的相关性都具有统计学意义(P<0.05)。透明度参数与其他参数的多元线性回归具有统计学意义(P<0.05),偏回归系数都有统计学意义(P<0.05),对比率对透明度参数的回归所起的作用最大。结论使用乳光瓷粉时,应根据其透射参数加以选择;对比率代表不透明度,反映乳光瓷的不透明特性,较遮色效果更具有代表性。Objective To measure the translucency parameter(TP),masking effect(ME),and contrast ratio(CR) of opal porcelain of Ceramco,Shofu,Noritake,and Vita,and to compare the correlations among the three transmission parameters,in order to provide reference for selecting opal porcelain correctly.Methods The color of specimens was measured according to CIE L*a*b* under different background and reflectance mode with a Color-Eye 7000A spectrophotometer.The color difference,TP,and ME value were calculated.Within 400-750 nm spectra,the ratio of light reflectance was measured,and CR was also calculated.The data was compared by ANOVA and SNK-q test(α=0.05).The correlation and multiple linear regression between TP,CR,and ME were analyzed(α=0.05).Results There were statistical difference with different shade of the same brands(P<0.05).The correlations between ME and TP,TP and CR,ME and CR were existed(P<0.05).TP was correlated not only with ME but also with CR based on multiple regression analysis(P<0.05).The partial correlation coefficients were statistically significant(P<0.05).CR was the main devotion to translucency parameter on multiple regressions.Conclusion It is recommended to select opal porcelains based on transmission parameters.CR value has an inner significance of opaque property of opal porcelain and can express opacity property of opal porcelain more appropriately than ME
