Abstract

ALEIXO, Renata Schepak et al. Effect of bleaching on staining susceptibility of a composite resin. Odontol. Clín.-Cient. (Online) [online]. 2013, vol.12, n.1, pp. 59-63. ISSN 1677-3888.

Objective: to evaluate the effect of at-home and in-office bleaching on staining susceptibility of a resin composite with immersion in staining solutions. Thirty specimens of a microhybrid composite were first evaluated with a spectrophotometer (Vita Easyshade), and randomly divided into 6 groups: G1: no bleaching, immersion in coffee; G2: no bleaching, immersion in red wine; G3: bleaching with 10% carbamide peroxide (PC10%) and immersion in coffee; G4: bleaching with PC10% and immersion in wine; G5: bleaching with 35% hydrogen peroxide (PH35%) and immersion in coffee; G6: PH35% and immersion in wine. The final color was evaluated for all groups. Color change values (CIELab), by means of L values - luminosity - were evaluated and statistically analyzed by ANOVA and Tukey's post-test. Results: means(standard-deviation) for initial L values were: G1:88.22(1.62); G2:86.76(0.86); G3:82.52(2.90); G4:84.72(1.24); G5:85.64(1.92); G6:86.30(1.13), e final L values were: G1:78.32(2.24); G2:76.46(1.61); G3:74.60(0.92); G4:65.00(3.97); G5:75.56(1.76); G6:72.48(4.69). ΔE values were also calculated, according to NBS criteria. Conclusion: there was an increased staining susceptibility of the resin composite submitted to at-home bleaching when immersed in red wine, compared to the another groups, by means of luminosity.

Keywords : Composite resin; Bleaching; Color change; Spectrophotometer.