Indian Journal of Science and Technology

Abstract

The purpose of this in vitro study was to compare the effect of in-office bleaching application on the color, microhardness, and surface roughness of five different tooth-colored restorative materials. Thirty specimens were fabricated from each restorative materials nano-hybrid composite (Grandio/Voco), micro-hybrid composite (Filtek Z250/3M), flow able composite (Filtek P60/3M), compomer (Dyract AP/DentsplyDeTrey) and glass-ionomer cement (Ketac Molar Easymix/3M)] and divided into 3 subgroups. Specimens in group 1 were stored in distilled water at 37ºC (control) during the hiatus period. Specimens in group 2 and 3 were treated with 15% hydrogen peroxide (HP) and 25% hydrogen peroxide, respectively. The data were analyzed with ANOVA and T-test. 15% HP and 25% HP groups showed an apparent color change (∆E*) than control group. In particular, Dyract AP and Ketac Molar Easymix showed a noticeable color change and statistically significant differences (p<0.05). HP groups showed a reduction in microhardness. Filtek Z250 and Filtek P60 does not have a statistically significant difference (p>0.05), Dyract AP and Ketac Molar Easy mix showed a statistically significant difference (p<0.05). Surface roughness was increased in 25% HP group after bleaching. In-office bleaching agents may affect the surface of existing restorations. Bleaching agents should not be used indiscriminately when these restorations are present.
Keywords: Microhardness, Surfaceroughness, Tooth Bleaching, Tooth Color