Abstract
The study aimed to evaluate the influence of 0.01% hydrogen peroxide (H2O2) containing dentifrice and brushing on color stability, micro-hardness, and surface roughness of resin based composites (RBCs). Twenty disks each (10 mm x 2 mm), for five different RBCs [IPS Empress (R) Direct (IPSE); Filtek (TM) Z350 XT (FZXT); Herculite, Kerr (EXRV); Aelite T (AA); and Esthet X (R) HD (EXHD)] were prepared. Each specimen was photo-polymerized for 40 seconds (sec). The specimens of each RBC were assigned randomly to two groups (n = 10) based on brushing specimens with distilled water or with dentifrice (0.01% H2O2). Surface roughness (Ra), color difference (Delta E), and Vickers micro- hardness (VHN) were measured before and after brushing. Data were analyzed using one-way ANOVA and Tukey's post hoc test. Surface roughness after brushing with dentifrice (H2O2) was significantly higher for FZXT and EXHD as compared to samples brushed with distilled water (p < 0.05). Only IPSE exhibited significantly lower hardness value when brushed in the presence of dentifrice (H2O2) than distilled water (p < 0.05). AA (p = 0.003) and HXRV (p = 0.002) showed significant change in color compared to controls (brushing with distilled water) when brushed with dentifrice (H2O2). In conclusion, brushing with whitening dentifrice containing 0.01% H2O2 had material specific adverse effect on surface properties of dental composite.