Effect of novel whitening toothpastes on the surface roughness, microhardness, and color stability of anterior Extra Bleach White (XBW) composite: an in-vitro study

Abstract

Aim: The current study investigated the effect of three different whitening tooth paste on surface roughness, microhardness and color stability of Gænial Anterior Extra Bleach White (XBW) composite resin.Materials and Methods: Total of 42 composite resin discs were prepared using a split Teflon mold. The specimens were distributed to 3 different groups (n=14). The specimens of each group were brushed with different whitening toothpaste. First group (C1), toothpaste containing charcoal (CURAPROX), second group (C2), toothpaste containing blue sapphire (CLOSEUP GOLD WHITE NOW) and third group (C3), toothpaste containing diamond powder and gold nanoparticles (SPLAT SPECIAL GOLD TOOTHPASTE). Surface roughness, microhardness and color stability of the tested samples were assessed before and after simulated tooth brushing and immersion in coffee. Shapiro-Whilk test and Levene’s test used to test normality and homogeneity. One way ANOVA test was used to compare several groups followed by Tukey’s post hoc test. t-test were used for intragroup comparisons. Results: whitening toothpaste containing charcoal showed the worst roughness after simulated tooth brushing and immersion in coffee. Surface hardness decreased in all groups, but whitening toothpaste containing diamond and gold nanoparticles showed nonsignificant best microhardness readings and significantly better color stability Conclusions: it was concluded that whitening toothpaste containing diamond and gold nanoparticles showed promising color stability with acceptable surface roughness and microhardness with anterior Extra Bleach White (XBW) composite. However, additional clinical studies are essential to confirm these results.