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Shear bond strength of a self-etch adhesive to Er:YAG laser-prepared dentin

The purpose of this study was to determine the shear bond strength of a self-etch adhesive to Er:YAG laser-prepared dentin and evaluate the resin-dentin interface. Extracted sound human molars were sectioned and wet-ground to expose flat dentin surfaces. These surfaces were subsequently irradiated by an Er:YAG laser with a wavelength of 2.94 μm and pulse repetition rate of 20 Hz. Energy density was set at 20 J/cm2 and spot size was 2 mm. The conventional bur was used as a control group. After surface treatments, a self-etch adhesive was bonded to the irradiated dentin surface and then a resin composite was applied to the dentin surface. Specimens were subjected to shear bond strength test after 24 h of storage in water. The bonding interface was examined by laser confocal scanning microscope (LCSM) after specimens were serially sectioned into multiple slices. The results revealed that Er:YAG laser irradiation did not present advantages compared to the conventional bur.