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  • Title: [Research on the designing method of a special shade guide for tooth whitening].
    Author: Xu Y.
    Journal: Hua Xi Kou Qiang Yi Xue Za Zhi; 2015 Oct; 33(5):478-83. PubMed ID: 26688939.
    Abstract:
    OBJECTIVE: To investigate a method of designing an accurate and scientific shade guide, especially used for judging the effect of tooth whitening, by analyzing the colorimetric values of discolored teeth statistically. METHODS: One hundred thirty-six pictures of patients who had been receiving the Beyond cold light whitening treatment from February 2009 to July 2014 were analyzed, including 25 tetracycline teeth, 61 mottled-enamel teeth, and 50 yellow teeth. The colorimetric values of discolored teeth were measured. The L* values of shade tabs were calculated by hierarchical clustering of those of discolored teeth. The a* and b* values of shade tabs were the mean of those observed for discolored teeth. Accordingly, different shade guides were designed for each type of discolored teeth, and the effects were evaluated. RESULTS: A statistically significant difference in colorimetric values was found among the three types of discolored teeth. Compared with the Vitapan Classical shade guide, the shade guides designed through the present method were more scientific and accurate in judging the effect of tooth whitening. Moreover, the arrangement of shade tabs was more logical, and the color difference between shade tabs and discolored teeth was smaller. CONCLUSION: The proposed designing method is theoretically feasible, although its clinical effect has yet to be proven. 目的: 通过对变色牙色度值的分析，探讨通过统计学方法设计牙齿漂白专用的，可以科学、准确地评价漂白效果的比色板。 方法: 分析2009年2月—2014年7月就诊的Beyond冷光美白患者的136张临床照片，其中四环素牙25例，氟斑牙61例，黄牙50例，测量变色牙色度值；用系统聚类分析法确定色标L*值，根据变色牙的a*、b*均值确定色标a*、b*值，为3种变色牙分别设计漂白专用比色板，并评价其效果。 结果: 3种变色牙的色度值存在差异；所设计的比色板与Vitapan Classical比色板相比色标排列更有规律，对漂白效果的评价更准确、更科学，其色标与变色牙的色差值更小。 结论: 这种牙齿漂白专用比色板的设计方法理论上是可行的，其实际效果还有待临床检验。
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