The aim of this study was to evaluate the effect of different surface treatments on shear bond strength (SBS) of resin composites to dentin using total etch adhesives.
Method:
Sixty extracted human molars were embedded in polyester resin and sectioned horizontally leaving an exposed dentin surface. The samples were divided into three groups (n=20): Group 1. Er:YAG laser (QSP mode, 120mJ/10Hz )+ Optibond FL + resin composite; Group 2. Er:YAG laser (MSP mode, 120mJ/10Hz) + Optibond FL + resin composite; Group 3. Etch with %37 phosphoric acid + Optibond FL + resin composite. After the specimens were prepared, the SBS test was performed at a crosshead speed of 1 mm/min. The fractured specimens were examined under a stereomicroscope to evaluate the fracture pattern. Statistical analyses were performed with one-way ANOVA and Tukey HSD tests.
Result:
The dentin surfaces treated with phosphoric acid (group 3) showed higher bond strength than the other groups (p<0.05). But there was no statistically significant differences between the laser treated groups (p>0.05).
Conclusion:
Using different modes (QSP and MSP) of Er:YAG laser for the dentin surface treatment before application of total etch adhesives is still not an effective alternative compared to acid etching.