Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives
Objectives: To evaluate the effect of dark cure activators on shear bond strength of resin cements with self-etch-adhesive-luted, opaque and translucent, restorations on dentin.
Methods: Human third molars were ground flat to expose dentin and randomly divided into 9 groups. For groups 1, 2 and 3, RelyX™ Ultimate resin cement and Single Bond Universal adhesive (RXU+SBU) was used to bond the specimens with resin composite rods. Group 4, 5 and 6, used Nexus®3 resin cement and Optibond™ XTR (NX3+XTR). Group 7, 8 and 9 used Nexus®3 resin cement and Optibond™ All-In-One (NX3+AIO). In groups 1, 4 and 7, translucent shade resin composite rods were bonded to the dentin and then light cured for 20 seconds from 5 directions. In group 2, 5, and 8, opaque resin composite rods were light cured from the top for 20 seconds and then kept in a dark box for 6 minutes, while in group 3, 6 and 9, the specimens were not light cured but kept in a dark box for 6 minutes after bonding with opaque resin composite rods. All specimens were then stored in 37°C distilled water for 24 hours and fifteen from each group were tested for shear bond strength.
Results: Regarding curing mode, the groups with light curing from 5 directions showed significantly higher mean shear bond strengths than the groups with partial light curing. The groups without light curing showed the lowest mean shear bond strengths (p<0.05). In the groups with light curing, RXU+SBU showed significantly higher mean shear bond strengths than NX3+XTR and NX3+AIO (p<0.05). In the groups without light curing, there was no significant difference.
Conclusions: Without light curing, the means of shear bond strength of resin cements used with self-etch adhesives were very low. The dark cure activators in the resin cements might not allow complete polymerization of the adhesives.
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