2007 Volume 50 Issue 4 Pages 493-499
During whitening procedures, not only teeth but also the restorative materials and periodontal tissue in the oral environment are exposed to the whitening agents. Although there have been several reports on the influence of whitening agents on restorative materials, controversial conclusions have been drawn. The purpose of this study was to investigate the effect of 30% hydrogen peroxide on color changes of three light-cured resin composites, Gradia Direct (GC), Filtek Supreme (3M ESPE)and Estelite Σ (Tokuyama Dental). Stained bovine teeth were prepared and resin composites were filled into the cavity. Resin composite columns were made as references. Then the specimens were soaked in 30% hydrogen peroxide, and color changes were evaluated using a Spectro-Photo Meter (CMS-35FS/c, Murakami Shikisai). From the results of this study, L* values of the filled resin composites as well as stained teeth increased significantly. It was concluded that the color changes of resin composites filled into the cavity depended on color changes of background teeth.
