Effect of Air Abrasion and Erbium-Doped Yttrium Aluminum Garnet (Er: YAG) laser preparation on Shear Bond Strength of Composite to Dentin

Abstract Introduction: The aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment.Methods: ۴۰ human extracted molars divided into ۴ groups (n=۱۰) received the following treatments. Group ۱: carbide bur, Group ۲: air abrasion with aluminum oxide ۵۰ μm, Group ۳: irradiated with Erbium-Doped Yttrium Aluminum Garnet (Er: YAG) laser (۱۵۰ mJ/۲۰Hz), Group ۴: irradiated with Er:YAG laser (۱۵۰ mJ/۲۰Hz)+ air. Specimens in all groups were chemically etched with phosphoric acid ۳۷% and treated with bonding agent (single bond ۳M). Then, composite build-up was performed by tygon tube. After storage in distilled water at ۳۷°c for one week, all specimens were subjected to a shear bond strength test with universal testing machine. Data were analyzed with ANOVA and T-Test.Results: The mean and standard deviation of shear bond strength of the ۴ groups were ۲۰.۸±۶.۷۶, ۱۴.۹۸±۳.۹۸, ۱۱.۴۳±۴.۳۶ and ۱۴.۹۵± ۳.۱۸ MPa, respectively.Conclusion: Air abrasion after laser treatment improved the shear bond strength. Keywords: Er-YAG laser dental air abrasion dentin