Color match of resin composite with two layer technique

本研究的目的是研究不同层厚对光固化树脂颜色变化的影响。使用EsteliteΣ（Tokuyama Dental, ESOA2, ESA2）， gradient Direct(GC Corp., GDAO2, GDA2), Filtek Supreme (3MESPE, FSA2D, FSA2E), Solare （GC Corp., SOAO2, SOA2）。制备了直径为8mm，厚度为0.1 ~ 4.0 mm的树脂盘。固化后立即用快速分光光度计（CMS-35FS/c, Murakami Shikisai）对三种有色板进行比色测量。颜色的测定采用CIE L^*a^*b^*色系。数据采用Tukey HSD检验（α=0.05）。实验结果如下：1.实验结果表明：不受黑白色板背景影响的树脂复合材料，ES和GD的OA2阴影厚度为2.0 mm， FSA2D的厚度为3.0 mm。这些不透明的遮光树脂对任何背景色都表现出可接受的掩蔽效果。对于不受颜色影响的单层圆盘，接受屏蔽效果的顺序为GDAO2、GDAO2、FSA2D、ESOA2、ESA2、SOA2、FSA2E、GDA2.3。采用厚度为1.5 mm的GDAO2遮光剂与厚度为0.2或0.3 mm的GDA2.4遮光剂组合，得到了既能呈现A4板颜色又能再现A2颜色的两层遮光剂。结果表明，本研究是评价颜色稳定性的有效方法。

The purpose of this study was to investigate effect of various layer thicknesses on color changes of light-cured resins, Four light-cured resins with different shades ; EsteliteΣ(Tokuyama Dental, ESOA2, ESA2), Gradia Direct(GC Corp., GDAO2, GDA2), Filtek Supreme (3MESPE, FSA2D, FSA2E), Solare (GC Corp., SOAO2, SOA2) were used. Resin disks (8mm in diameter with different thickness (0.1-4.0 mm.) were prepared. Colorimetric values of the specimens were measured immediately after curing against three colored plate using a fast spectro-photometer (CMS-35FS/c, Murakami Shikisai). The CIE L^*a^*b^* color system was used for the determination of the color.The data was subjected to Tukey HSD test (α=0.05).The results were as follows ;1. The thickness of the resin composite which was not influence by the white and black colored plates background was 2.0 mm for OA2 shade of ES and GD and 3.0 mm for FSA2D. These opaque shade resins exhibited acceptable masking effect against any background colors.2.As for the single layer disk which is not influenced color, color-shielding effect was accepted in order of GDAO2,GDAO2,FSA2D, ESOA2,ESA2,SOA2,FSA2E and GDA2.3. Two layer that could mach the color of A4 plate as well as reproduce A2 color was obtained with the combinations of 1.5 mm thickness of GDAO2 shade and 0.2 or 0.3 mm thicknesses GDA2.4. It was shown that this study is effective as how to evaluate color mach stability.