新、旧Vita比色板的色度学比较研究

Comparative study on the shade of two kinds of Vita shade-guide

目的 :测定并比较新、旧Vita比色板 (VITAPAN 3D Master和LUMINRVACUUM Farbskala)的色度差异 ,为新型Vita比色板的临床应用提供参考。方法 :采用美能达彩色色差计 (CR 32 1型 ,Minolta ,Japan)对两种比色板进行色度学测量。D6 5为测试光源。颜色的表达采用CIE1976L a b 表色系统。测试部位选择在色标的中 1 3部分 ,每个色标测 3次 ,取平均值作为该色标的色度值。结果 :新比色板的明度范围较大 ,增加了明度较低的色片 ;色片向红色做了较大偏移 ,而绿色调色片相对不足 ,黄蓝色调范围扩大 ,偏黄色片基本可以满足中国人牙的要求 ,而蓝色调色仍显相对不足。两种比色板并无一一对应关系 ,只有少数色片的颜色差别肉眼无法辨别。结论 :虽然VITAPAN 3D Master比色板比旧比色板增加了 10个色片 ,且覆盖的色度空间有所扩大 。

Objective: To measure and compare the color of a new and a conventional Vita shade guide(VITAPAN 3D-Master and LUMIN RVACUUM-Farbskala) in order to provide the references for clinical application.Methods: Color in the two shade guides was measured with Minolta colorimeter CR-321 under the light of D 65 and reported in CIE1976L*a*b* color system. Each tab was detected 3 times in the same dimensions at the middle facial surface. Mean values were calculated as the shade of the tab.Results: The range of color value in VITAPAN 3D-Master was larger than that in LUMIN R VACUUM-Farbaskala because the lower value tab was added. The distrbution of a* deviated to the red color , while the green color was relatively deficient. The yellow color could cover the color space of Chinese teeth, and the blue was not enough, although the distribution of b* was enlarged. The tabs of the two shade guides did not match with each other. Only a few tabs could not tell in shade by naked eyes. Conclusion: VITAPAN 3D -Master shade guide can not cover the color of Chinese teeth although it has 10 tabs added and color space enlarged.