Nd:YAG Laser Irradiation of Etched/Unetched Dentin Through an Uncured Two-step Etch-and-Rinse Adhesive and its Effect on Microtensile Bond Strength

摘要: PURPOSE To evaluate whether Nd:YAG laser irradiation of etched and unetched dentin through an uncured adhesive affected the microtensile bond strength (µTBS). MATERIALS AND METHODS Flat surfaces were created in 19 extracted human third molars. Adper Single Bond (SB) was applied over (groups 1 to 3) or 4 6). The then irradiated with a adhesive, using 0.75 W power settings, except for control groups 4). light cured composite crowns built up. After 24 h, teeth sectioned into beams, cross-sectional areas 0.49 mm2, stressed under tension. Data statistically analyzed two-way ANOVA Tukey's test (α = 5%). Dentin fractured specimens interfaces untested beams observed scanning electron microscopy (SEM). RESULTS Acid etching, irradiation, their interaction significantly bonding (p 0.05). However, higher µTBS means found on lased 5 6), but only comparison group 4, where neither lasing nor etching performed. Groups 6 showed lowest among all tested < Laser did not change characteristics hybrid layers created, while solidification globules SEM. CONCLUSION improve suggested manufacturer's technique.