Color match of resin composite with two layer technique

为了研究不同层厚对光固化树脂颜色变化的影响，使用了四种不同色度的光固化树脂：EstiteΣ(德山牙科、ESOA2、ESA2)、GRadia Direct(GC CORPORATION、GDAO2、GDA2)、FILTEK SUPER(3MESPE、FSA2D、FSA2E)、Solare(GC Corp.、SOAO2、SOA2)。树脂盘(直径8 mm，不同厚度(0.1-4.0 mm))已经做好了准备。用快速分光光度计(CMS-35FS/c，Murakami Shikiai)在三色平板上固化后立即测量试件的比色值。采用CIE L色度计进行比色测定，并对所得数据进行Tukey HSD检验(α=0.0 5)，结果如下：1.不受黑白色板背景影响的树脂复合体厚度ES和GD分别为2.0 mm和3.0 mm。对于不受颜色影响的单层盘，遮色效果依次为GDAO2、GDAO2、FSA2D、ESOA2、ESA2、SOA2、FSA2E、GDA2.3。1.5 mm厚度的GDAO2阴影和0.2 mm或0.3 mm厚度的GDA2.4的组合可获得两层既能保持A4板的颜色又能再现A2颜色的层。结果表明，该方法对于评价颜色马赫稳定性是有效的。

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.