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Objective: The objective of this study was to compare the effect of immediate and delayed light activation of resin composite on the microtensile bond strength (µTBS) of self-etch adhesive and universal adhesive in self-etch mode under dynamic pulpal pressure.
Materials and Methods: Thirty dentin discs were prepared from extracted third molar without any pathological conditions. Smear layers were created by coarse diamond bur. The dynamic pulpal pressure model was set at 15 cm H2O and connected to the tooth specimen. A two-step self-etch adhesive (Clearfil SE Bond) and two universal adhesives applied in self-etch mode (Clearfil Universal Bond Quick and G-Premio BOND) were applied to dentin surfaces according to the manufacturer’s instructions. Each adhesive was divided into 2 groups: immediate light activation (IM) and delayed light activation (DL). For IM group, the resin composite was placed over the bonded dentin disc and light activated immediately while the resin composite in DL group was placed and left for 150 sec before light activation. Specimens were stored in distilled water at 37°C for 24 h and subjected to µTBS test using a universal testing machine at crosshead speed of 1 mm/min until failure occurred. The µTBS data were analyzed using two-way ANOVA and Tukey’s multiple comparison tests.
Results: Two-way ANOVA showed that the effect of delayed light activation was not significant on the µTBS (p>0.05), but the effect of adhesives was significant (p<0.001). There was no significant interaction between adhesive and time (p>0.05). The highest bond strength was observed in Clearfil SE Bond while no statistically significant difference was detected when compared with G-Premio BOND.
Conclusion: Delayed light activation of resin composite for 150 sec does not affect dentin bond strengths of self-etch adhesive and universal adhesive in self-etch mode.
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