Efeito de dentifrícios branqueadores em resina composta

Abstract

Introduction: Whitening dentifrices are cosmetic products used together with a toothbrush to perform oral hygiene. Different whitening technologies are found in the components of toothpastes, which may be represented by mechanical, chemical, optical and adsorptive agents; and described as abrasives, peroxides, blue covarine and activated carbon, respectively. These agents are part of toothpastes components in isolation or in association. Objective: To evaluate in vitro the effect of dentifrices containing different whitening agents on the color, roughness and mass of a nanoparticle composite resin, after brushing with an electric toothbrush. Material and Methods: 110 test specimens (PC) of FILTEK Z350XT composite resin were randomly distributed into two experiments according to the dentifrices under study. Experiment I - 5 groups (n=10): GC (distilled water) and 4 test groups (GT1 - Colgate Total 12 Clean Mint®, GT2 - Colgate Luminous White Instant®, GT3 - Colgate Luminous White Glow® and GT4 - Colgate Luminous White Activated Carbon®); and Experiment II - 6 groups (n=10): GC (distilled water) and 5 test groups (GT1 - Colgate Total 12 Clean Mint®, GT2 - New White®, GT3 - White Carvo Mint®, GT4- New White® + Colgate Total 12 Clean Mint® and GT5 - White Carvo Mint® + Colgate Total 12 Clean Mint®). All groups were subjected to brushing with an electric toothbrush for periods of 1, 3 and 6 months and, after brushing, color, roughness and mass were evaluated. Results: In Experiment I, after six months of brushing, when compared to CG, the L* value was higher in groups GT1, GT2 and GT3 (p<0.05). At the same time, there was a reduction of the a* value in groups GT1 and GT2 when compared to CG (p<0.05), while only GT1 differed from CG regarding parameter b* (p<0.05). Regarding roughness, groups GT2, GT3 and GT4 presented greater roughness than CG (p<0.05), although there was no variation in mass. In Experiment II, at the final brushing time, groups GT1, GT4 and GT5 differed from CG, with an increased parameter L* (p<0.05). Regarding the a* value, only GT1 differed from CG (p<0.05), while for the b* value, all test groups differed from CG (p<0.05). An analysis of the variable roughness after six months of brushing demonstrated that all test groups differed from the GC (p<0.05) and only GT5 differed from GT1 (p<0.05), although no mass loss was observed. Conclusion: Brushing with whitening dentifrices, either as cream or powder, regardless of the whitening strategy presented in the formulation, promoted a whitening effect similar to that found in a conventional dentifrice and neither did it cause mass loss of the nanoparticulate composite resin, despite the variation in roughness.