相同色号九种光固化复合树脂的无限光学厚度研究

Analysis of Infinity Optical Thickness between Nine Kinds of Composite Resins with the Same Color Mark

目的比较相同色号的9种光固化复合树脂的无限光学厚度。方法选用9种颜色标号为A2的光固化复合树脂为实验对象,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9种树脂的无限光学厚度有明显差异。超微填料树脂无限光学厚度较厚,混合填料树脂无限光学厚度较薄,含有遮色成分的树脂厚度最薄。结论相同色号的光敏树脂虽填料颗粒相同,但无限光学厚度存在差异,临床应用时最好预备多种树脂以备选色。

Objective This study compared the infinity optical thickness of composite resins with the same color marks.Methods In this test nine composite resins(shade A2)were used.A plastic mold(10mm in diameter,4mm in height)was used to prepare27disk specimens.Color was measured by CIE L*a*b*relative to CIE source against a white and a black background,using a colorimeter.Color difference(△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△E=1.5was calculated by regression formulation.Results The results indicated that composite resins with hybrid filler and opaque pigments were superior infinity optical thickness.Composite resins contain micro-filler were inferior infinity optical thickness.Conclusion Although composite resins with the same color mark had the similar fillers,they had different color and infinity optical thickness.