应用Crystaleye比色仪评价复合树脂厚度对颜色的影响

The evaluatin of the thickness on the color of Composite resin by Crystaleye

目的:应用Crystaleye比色仪评价厚度对复合树脂表面颜色的影响。方法:根据Vita比色板A3色调选取新鲜人离体上颌中切牙56颗,随机分为8组,每组7颗牙。实验组7组,将不同厚度(0.8 mm,1.0 mm,1.2 mm,1.4 mm,1.6 mm,1.8 mm,2.0 mm)的Filtek TM Z350复合树脂光固化于每组牙齿的唇面,对照组牙齿表面不作任何处理,使用Crystaleye比色仪测定每组牙齿表面的颜色,计算在相同底色材料下,不同厚度复合树脂牙齿表面的色差△E*。采用SPSS14.0软件对实验数据进行统计学分析。结果:随着Filtek TM Z350复合树脂厚度的增加,牙齿表面的L*值、a*值与b*值均逐渐降低,各组间差异有统计学意义;在与对照组之间的色差值比较中,1.2 mm和1.4 mm厚度组与对照组之间的色差值均小于1.5 NBS。在厚度组两两之间的比较中,相邻厚度组之间的色差均小于1.5 NBS,其他任意不相邻厚度组之间的色差比较均大于1.5 NBS。结论:复合树脂的厚度变化可明显改变牙齿表面的颜色。

Objective： To evaluate the effect of the thickenss of composite resin on the final color of teeth by Crystal- eye. Method： According to the Vita shade guide color A3, fivty-six extracted human maxillary central incisor were collect- ed, dived into eight groups, experimental groups were seven, FiltekTM Z350 composite resin were fabricated at thickness of 8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm and 2.0 mm.None was fabricated in the control group.The CIE L＊a＊b＊ values of teeth were measured by a colorimeter （Crystaleye）to determine the colorimetric difference, when different thickness of composite resin were overlaid at the same backgrounds. SPSS14.0 software package was used for statistical analysis. Result： With the increase of the thickness of composite resin, the L＊ value, a＊ value and b＊ value were gradually decreased, statisti- cally significant were found. In the comparison of color, the color difference values of 1.4 mm thickness group and the con- trol group, 1.6 mm thickness group and the control group were less than 1.5 NBS; the color values between thickness groups of the adjacent body resin were greater than 1.5 NBS, and the color values among the other arbitrary thickness groups of body resin were greater than 1.5 NBS. Conclusion： The final color of teeth were significant affected by the change of the thickness of composite resin.