Effect of Different Adhesive Systems on Repair Bond Strength of Resin Composites

Purpose: Purpose of this study was to evaluate the effects of different adhesive systems on repair bond strength of a resin composite. Material and Methods: 60 composite discs were build. Half of the discs were subjected to thermal aging. Aged and non-aged specimens were repaired with resin composite using three different adhesive systems; then subjected to micro-shear forces. data were analyzed statistically (p 0,05). Results: Adhesive systems and aging affected the bond strengths (p 0,001). In non-aged groups; there was no statistical difference between groups bonded with 2 step self-etch and 1 step total-etch adhesive. Other groups were statistically different (p 0,05). In aged groups; there were statistical difference between groups bonded with 2 step self-etch and 1 step self-etch adhesive. Other groups were not statistically different (p 0,05). Conclusion: 2 step self-etch and 1 step total-etch adhesives exhibited higher micro shear bond stregth values of aged composites.