Abstract
The objective of this study was to evaluate the effect of surface treatment with Er:YAG and Nd:YAG lasers on resin composite bond strength to recently bleached dentin. A total of 120 bovine incisors were distributed into two groups: C- without bleaching; and B- bleached with 35% hydrogen peroxide. Each group was divided into three subgroups: N- without laser treatment; Nd- Nd:YAG laser irradiation; and Er- Er:YAG laser irradiation. The adhesive system (Adper Single Bond 2) was applied and composite build-ups were constructed with Filtek Supreme (3 M/ESPE). The teeth were sectioned to obtain dentin–resin sticks (1 × 1 mm2) and tested by microtensile bond testing. The bond strength values in group B, subgroup N (16.1 ± 3.5 MPa) presented no significant difference compared with group B, subgroup Er (14.7 ± 6.1 MPa). Group C, subgroup N (26.8 ± 7.4 MPa) presented no significant difference compared with group B, subgroup Nd (28.8 ± 5.6 MPa). Group C, subgroup Nd (36.1 ± 7.9 MPa) presented a significant increase in bond strength compared with the other groups. The Er:YAG laser did not influence the bond strength of bleached specimens, and the use of the Nd:YAG laser on bleached specimens was able to reverse the immediate effects of bleaching, obtaining bond strength values similar to those of the control group.
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