2020 Volume 30 Issue 3 Pages 71-76
We examined the adhesion of resin composite restorations with the one-step self-etch bonding system to dentin irradiated by Er:YAG laser. We used two one-step self-etch bonding systems and one two-step self-etch bonding system. Flat bovine dentin surfaces were prepared using a model trimmer and water-resistant paper （#600）, and were irradiated with Er:YAG laser （100mJ, 10pps）. Non-irradiated specimens were used as a control.
After bonding procedures, the specimens were stored in 37℃ distilled water for 24h. Thereafter, a tensile bond strength test was performed in each group （n＝5）. In the two-step bonding system, a significant difference was found in the tensile bond strength between the non-irradiated dentin and the dentin irradiated by Er:YAG laser, but was not found in the one-step bonding system. It is suggested that with the one-step bonding system, the laser irradiation has a small influence on the adhesion of resin composite restorations to dentin irradiated by Er:YAG laser.
