@ARTICLE{KhazaeiPoul, author = {Esmaeili, Behnaz and Ahmadizenouz, Ghazaleh and KhazaeiPoul, Faezeh and Samani, Yasaman and Gholinia, Hemmat and }, title = {Effects of Carbamide Peroxide Bleaching Gel on Color of Silorane- and Methacrylate-based Resin Composites}, volume = {4}, number = {3}, abstract ={Introdouction: Bleaching has become a common treatment for improving the appearance of natural teeth. However, the need to protect dental restorations from bleaching agent exposure is inevitable, as these agents may change the color of restorative materials by oxidation. Filtek P90 composite resin has recently been introduced with the aim of decreasing polymerization shrinkage. The purpose of this study was to compare the color changes of silorane- and methacrylate-based resin composites after exposure to various carbamideperoxide regimens. Materials and methods: Sixty-four disk-shaped specimens (10 × 2 mm) of a microhybrid composite, Z250, and a siloranebased composite, P90, were prepared and divided into four subgroups (n = 8). An unbleached group was used as a control, while the remaining specimens in the three subgroups were bleached with 10%, 16%, and 22% carbamide peroxide for 14 days. The color was measured with a spectrophotometer using Commission International de I’Eclairage L*, a*, and b* color scale. The data were analyzed using ANOVA, the t-test, and Tukey’s HSD test. Results: Color differences between bleaching and baseline values (&DeltaE) were }, URL = {http://3dj.gums.ac.ir/article-1-181-en.html}, eprint = {http://3dj.gums.ac.ir/article-1-181-en.pdf}, journal = {Journal title}, doi = {10.18869/acadpub.3dj.4.3.15}, year = {2015} }