三种比色板的色度分析

Determining Color Dimensions of Three Shade Guides

目的 :测定、分析三种比色板色度值。方法 :采用国际照明委员会 (CIE) 1976L a b 色度系统 ,用Shade EyeNCC测色仪和ShadeEyeViewer分析软件 ,对Vitapan 3D -Master、VitaLuminVacuum和IvoclarChromascop三种比色板进行色度值测定、分析 ,并与中国人天然牙色度值比较。结果 :三种比色板的L 值范围接近 ,但与中国人天然牙相比 ,L 值的上限都偏低 ,缺乏 75～ 86之间的高明度值 ;VitaLuminVacuum比色板在相近L 值水平集聚了过多的色片 ,并且其a 、b 值范围都太窄 ;IvoclarChromascop比色板缺乏b 值小的色片。结论 :Vitapan 3D -Master与中国人牙色度值匹配最好 ,缺点是缺少高明度色片 ;IvoclarChromascop缺乏饱和度较低的黄色调色片 ;VitaLuminVacuum的L 、a 、b 值分布都不合理 。

Objective:To study color dimensions of three shade guides.Methods:Three kinds of shade guide, including Vitapan 3D-Master,Ivoclar Chromascop and Vita Lumin Vacuum,were measured by ShadeEye NCC spectrocolorimeter,and analyzed by ShadeEyeViewer software on CIE 1976L *a *b * color system.The result was compared with Chinese nature teeth. Results:The L * was similar among the three shade guides,but it was not high enough comparing with Chinese nature teeth,especially between 75～86. For Vita Lumin Vacuum,there were clustering of colors in certain L * level ,and the a * and b * did not extend through the volume of Chinese nature teeth required. Ivoclar Chromascop lacked tabs of lower b *.Conclusions:Comparing with Chinese nature teeth, Vitapan 3D-Master was the most suitable one,except lacking high Value tabs. Ivoclar Chromascop lacked ligh yellow tabs. Vita Lumin Vacuum`s color dimensions were far away from Chinese nature teeth.