Abstract
This study evaluated the effect of antioxidant agents on microtensile bond strengths (µTBS) of composite to bleached enamel. Fifteen freshly extracted human third molars were selected and randomly assigned to 6 groups (n = 5): (NB) enamel not bleached, (B) bleached enamel, (BR7) bleached enamel and restored 7 days later, (BSA) bleached enamel+sodium ascorbate, (BMC) bleached enamel+malvidin chloride, (BPC) bleached enamel+pelargonidin chloride. The groups were bleached with 38% hydrogen peroxide (HP - Opalescence Xtra Boost) and restored with Single Bond+Filtek Z350. The specimens were thermocycled and submitted to a microtensile load at 1 mm/min crosshead speed. The data were evaluated by ANOVA and Tukey test at 5% of significance. The mean and standard-deviation for all groups were: NB: 30.95(±11.97)a; BSA: 30.34(±8.73)a, BPC: 22.81(6.00)b, BR7: 21.41(±6.12)b, B: 14.10(±4.45)c, BMC: 13.25(±6.02)c. Sodium ascorbate reversed the bond strengths to enamel immediately after bleaching.
Highlights
This study evaluated the effect of antioxidant agents on microtensile bond strengths of composite to bleached enamel
The bond strength of adhesive restorations to teeth structures is reduced after bleaching procedures[1,2], due to the presence of residual peroxide, which interferes with the resin polymerization[3]
The aim of this study was to evaluate the effect of different antioxidant agents on the microtensile bond strengths of composite restorations to enamel bleached with 38% hydrogen peroxide
Summary
The bond strength of adhesive restorations to teeth structures is reduced after bleaching procedures[1,2], due to the presence of residual peroxide, which interferes with the resin polymerization[3]. The recommended post bleaching waiting period for bonding procedures varies from 24 hours to 4 weeks[1,4,5]. This period is important for stabilization of dental color in order to obtain better aesthetics results while the selection of the color of composite resin to be used. This waiting period makes it impossible to perform restorative procedures immediately after the bleaching. Further research is necessary to identify possible techniques that may reduce this post bleaching waiting period
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