Avaliação da eficácia dos tratamentos de superfície do esmalte na prevenção do manchamento dentário pós clareamento

Abstract

Objectives - The aim of this in vitro study was to evaluate the efficacy of varied surface treatments on the bleached enamel with 35% hydrogen peroxide for the prevention of coffee stain absorption. Methods - Fifty-five bovine incisors were subjected to bleaching with 3 applications of35% hydrogen peroxide and randomly distributed into five groups, treated as follows: Group I (control group) remained stored in distilled water while the other groups were treated, Group II was treated with acidulated fluoride (1,23%), Group III was treated with neutral fluoride (2%), Group IV was treated with casein phosphopeptideamorphous calcium phosphate fluoride (CPP-ACPF) and Group V was treated with Keep White Rinse (DMC). After the surface treatments all the specimens were immersed in coffee for 24 hours and the stain absorption was evaluated. All the specimens were assessed using a spectrophotometer at the baseline and after bleaching and staining for color analysis according to the CIELab system, and data were analyzed with ANOVA and Tukey test for multiple comparisons. Results - The stain absorption with the surface treatment with neutral fluoride (7.70), CPP-ACPF (6.71) and Keep White Rinse (7.22) on bovine bleached enamel surface was significantly reduced when compared to the control group (10.12) while the surfacetreatment with acidulated fluoride increased the stain absorption (13.43).Significance - Neutral fluoride, CPP-ACP and Keep White Rinse can reduce the stain absorption after tooth bleaching, which would make the result achieved with in-office bleaching last longer.