两种VITA比色板的色度学比较

目的：对两种VITA比色板的色度范围进行比较分析，并与中国人牙色度范围相比较，以便为临床选色和瓷粉的使用提供指导。方法：选用CIEl976—L^*a^*b^*色度系统，用Minolta CM—2600d分光测色计对两种VITA比色板的色度佰进行测定，对二者的色度范围做了比较分析。结果：与Vita C1assical比色板相比，Vita 3D Master比色片明度值在较低的区域也有分布，a^*增大，使颜色向黄红色调方向移动；b^*也增大，使颜色的饱和度增大。Vita 3D—Master比色板几乎全部涵盖了Vita Classical比色板的明度和饱和度范围。二者与中国人牙色度范围相比较，部缺乏明度较高的色片，Vita 3D Master比色板较Vita C1assical比色板能够更好的覆盖中国人牙色范围，二者的色度范围相加则更有代表性。结论：Vita 3D—Master比色板较Vita Classical比色板颜色分布的范围更符合中国人牙色度范围、排列更合理，为临床准确地选色、配色提供了可靠的依据。

Color comparison of two kinds of VITA shade guides

Objective: To analyze the color range of two kinds of Vita shade guides, and compare these color rangewith that of Chinese teeth. Methods: The color range and ordering of Vita Classical and Vita 3D-Master shade guides weremeasured and analyzed with MINOLTA CM-2600d spectraphotometer under D65 standard source CIE-1976-L*a*b* colorrange system was employed in this study. Results: Compared with Vita Classical shade guide, Vita 3D Master extended itscolor in a* ,b*, which include more yellow-reddish and more saturate color tabs. L* extended darker color, while in higherrange these two were the same. comparing these color range with that of Chinese teeth, we found the color range of Vita3D-Master was more preferable to that of Vita Classical. Conclusion: Due to the nature of larger teeth-color coveringrange and the logical arrangement, it's preferable to use Vita 3D-Master shade guide clinically.