相同系列不同颜色光固化树脂的无限光学厚度测试

Study on the Infinity Optical Thickness of Light-Cured Composite Resins and Attached Shade Guides

目的比较相同系列不同颜色标号的光敏树脂的遮色性能。方法选用3种系列23个颜色标号的光敏树脂为实验对象,应用美能达CS-321便携式色差仪,测试树脂不同厚度在标准黑白板上的色差值(△E),利用对数回归方程计算出△E=1.5时各树脂的无限光学厚度。结果不同树脂相同颜色标号的光敏树脂的无限光学厚度存在明显差异;同一颜色系列标号从小到大,无限光学厚度依次减低;从A至D标号,并非简单的依次减低,而是存在交叉现象。结论不同品牌树脂相同颜色标号的光敏树脂的无限光学厚度存在明显差异,超微填料复合树脂的无限光学厚度较其它种类填料复合树脂的厚。

Objective This study compared the opaque characteristics of light-cured composite resins and attached shade guides.Methods Three kinds of light-cured composite resins and attached shads guides were used.A plastic mold(10mm in diameter and4mm in height)was used to prepare disk specimens.Color was measured by CIE L*a*b*relative to CIE source against a white and a black background,using a colorimeter.Color change(△E)was calculated as△E=〔(△L*) 2 +(△a*) 2 +(△b*) 2 〕 1/2 .The heights of composite resins were recorded as△E≈1.5.The infinity optical thickness of composite resins when delta E*=1.5was calculated by regression formulation.Results There was significant difference in color difference and the infinity optical thickness among materials and shades.The infinity optical thickness gradual decreased in the same shade mark from1to4,and from A to D the results was not simple.Conclusion There was significant difference in the infinity optical thickness between the attached shade guides and the resins materials.Composite resins contain micro-filler were inferior in infinity optical thickness.