INFLUÊNCIA DE PRODUTOS OVER-THE-COUNTER NAS PROPRIEDADES FÍSICAS DE UMA RESINA COMPOSTA NANOHÍBRIDA

Abstract

The objective of this study was to evaluate, in vitro, the physical properties of surface roughness and color change of a nanohybrid resin after simulated brushing with over-the-counter products. A total of 48 cylindrical samples (9mm x 2mm) of nanohybrid composite enamel resin (B1E - Form; Ultradent) were fabricated and randomly divided into 4 groups (n=12) according to the treatments: distilled water (control), Colgate Maximum Cavity Protection - regular toothpaste (CMPA), Colgate Luminous White Coffee Lovers (CLWL), and Rizu Toning Serum (RIZU). Color analysis (ΔL, Δa, Δb, ΔEab, and ΔE00) was performed using a reflectance spectrophotometer, and roughness profile (Ra) was measured using a roughness tester at the following time points: baseline (T1), after staining (T2), and after brushing (T3). Data were assessed for normality using the Shapiro-Wilks test, and then different statistical tests were applied: ANOVA with Benjamini, Krieger, and Yekutieli post-test for ΔL, Δb, and sample roughness; Kruskal-Wallis and ANOVA for ΔE00 and Δa; and non-parametric tests of Kruskal-Wallis and Dunn for ΔEab. A significance level of α=0.05 was considered for all analyses. The results for ΔL and Δb showed statistically significant differences among the groups at T3 (p<0.05). For Δa, there were no statistically significant differences between groups, regardless of the evaluated time. Additionally, ΔEab and ΔE00 values were not statistically significant for any group, regardless of the evaluated time. Among the evaluated toothpaste groups, the CMPA group showed a significant increase in average roughness at T3. It can be concluded that none of the tested toothpastes caused a color change based on ΔEab and ΔE00 indices of the composite resin, indicating no notable changes in the intrinsic color variation of the material. Simulated brushing for 1 month with whitening toothpaste was unable to alter the roughness of the composite resin. However, treatment with regular toothpaste was the only one that caused an increase in the roughness of the nanohybrid composite resin.