Yap A U, Sim C P, Loh W L, Teo J H
National University of Singapore, Faculty of Dentistry, Department of Restorative Dentistry, Singapore.
Oper Dent. 1999 Nov-Dec;24(6):358-63.
This project compared the difference in color matching between human-eye assessment and computerized colorimetry. Fifty dental personnel were asked to color match Vita Lumin shade tabs to seven different randomly arranged test tabs from the Z100 shade guide. All evaluators were blinded to the shades of the test tabs and were asked to match only body shade of the Vita Lumin tab to the middle third or body of each test tab. The results obtained were subsequently computed into Lab* values and compared with results obtained by computerized colorimetry. Results indicate that the difference in color matching between human-eye assessment and computerized colorimetry is shade dependent. Discrepancy was significant for b* coordinates for shades A1 and B2 and L* and b* coordinates for shade C4. For all shades evaluated, color difference between human-eye and computerized color matching is perceivable under clinical settings, as delta E values are greater than 3. There is a need for correction factors in the formal specification of the color-matching software due to the discrepancy between human-eye and computerized colorimetric color matching.
本项目比较了人眼评估与计算机比色法在颜色匹配上的差异。五十名牙科工作人员被要求将Vita Lumin比色片与Z100比色指南中七个随机排列的不同测试片进行颜色匹配。所有评估人员均对测试片的色号不知情，并被要求仅将Vita Lumin比色片的主体色号与每个测试片的中间三分之一或主体部分进行匹配。随后将获得的结果计算为Lab值，并与计算机比色法获得的结果进行比较。结果表明，人眼评估与计算机比色法在颜色匹配上的差异取决于色号。对于A1和B2色号，b坐标以及对于C4色号，L和b坐标的差异具有显著性。对于所有评估的色号，由于人眼与计算机比色法颜色匹配之间存在差异，在临床环境下，人眼与计算机颜色匹配之间的色差是可感知的，因为ΔE值大于3。由于人眼与计算机比色法颜色匹配之间的差异，在颜色匹配软件的正式规范中需要校正因子。
