Two vital bleaching commercial products and three types of glassionomer restorative materials were selected for this study. Bleachingmaterials used were Opalescence Xtra Boost (38% hydrogenperoxide with pH of 7) and Opalescence Quick (35% carbamideperoxide with PH of 6), both of which were manufactured by(Ultradent Inc., South Jordan, Utah, USA).Glass ionomer materials used were Ketac Fil (conventional glassionomer), Photac Fil (resin modified glass ionomer) and F2000 (polyacid modified composite resin), which were manufactured by 3M (Espe.StPaul, USA). Shade of all glass ionomer materials used was A2.
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