Vitapan3D-Master比色板与南京地区人群天然牙色度空间的比较

目的研究Vitapan 3D-Master比色板与天然牙在色度空间上的适合性。方法采用CIE L*a*b*色度系统，用ShadeEye NCC测色仪对南京地区居民271人的2 159颗天然牙和Vitapan 3D-Master比色板进行色度值测定，分析天然牙和比色板的色度空间分布，比较二者的适合性。结果1）天然牙比Vitapan 3D-Master比色板色度空间分布区域广，切牙组与比色板的适合性较差，尖牙-前磨牙组适合性较好。2）在色度空间上，切牙色度a*值偏向绿色方向（-a*），比色板色度a*值偏向红色方向（+a*）；切牙比色时缺乏L*值为71～78、a*值为-1.5～-0.2色度空间范围内的比色片。3）按照可感知色差阈值△E*ab<1.4的标准，天然牙与Vitapan 3D-Master比色板相比，理论符合率为：切牙组33％，尖牙-前磨牙组50％。结论Vitapan 3D-Master比色板不能满足南京地区居民牙齿临床比色要求。

A comparison of color space of Vitapan 3D-Master shade guides to nature teeth from Nanjing population

  Abstract] Objective To study the fitness of color dimension between Vitapan 3D-Master shade guides and nature teeth. Methods 2 159 nature teeth from Nanjing population and Vitapan 3D -Master shade guides were analyzed by dental chromameter ShadeEye NCC on CIE L*a*b* color system. Results 1）The color dimension of natural teeth displayed a broader range than those from Vitapan 3D-Master shade guides. Comparing with incisor group, canine -premolar group had better fitness with Vitapan 3D-Master shade guides. 2）In color space, incisor values a* shifted toward green（-a*）, while the shade guide values a* located toward red（+a*）. The shade guide lacked tabs of values L* 71—78 and a* -1.5—-0.2 for natural incisor. 3）According to the perceptibility threshold △E*ab<1.4, the match rates with Vitapan 3D-Master shade guides was 33% in incisor group and 50% in caninepremolar group. Conclusion Vitapan 3D-Master shade guides had inferior match with nature teeth from Nanjing population, especially in incisor.