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It is pointed out that the color of composite resin is changing according to it's ploymerization and this color change is a harmful effect for the clinical satisfacion of composite resin restoration. The purpose of this study was to compare the changes of color of newly developed composite resins between before and after exposure of activating light. Five Compostie resins (8 shades) were employed: Palfique Estelite(UL, U, DY, G ; Tokuyama), Photo Clearfil A (US : Kuraray), Photo Clearfil Bright (US ; Kuraray), GC Graft LC(A3 ; GC), Silux Plus(U; 3M), Tristirnulus values of each material were determined before and after curing-light exposure by using a Micro Multi Photometer (MMP-1001, Nihon Denshoku Kogyo). The values were transformed into $L^*\;a^*\;b^*$ 수식 이미지 system and color changes of the resins were evaluated by the changes of $L^*$ 수식 이미지, $a^*$ 수식 이미지 and $b^*$ 수식 이미지 values for the individual shades. In addition, the effects of resin thickness and background color on color changes were also studied The finding were as follows: 1. Color changes of $L^*$ 수식 이미지, $a^*$ 수식 이미지 and $b^*$ 수식 이미지 values were recognized due to the light exposure for all products. The $b^*$ 수식 이미지 values of Palfique Estelite showed negligible changes for all shades. 2. The $b^*$ 수식 이미지 values were affected strongly by the background color, especially when decreasing the brightness on the background color.(Request original article reprints to Dr. Aoshima)
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