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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Suphapraphawanit S, Kanjantra P, Thong-ngarm W. Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives: Original articles. CM Dent J [Internet]. 2017 Jan 06 [cited 2024 Nov 18];38(1):49-62. Available from: https://www.dent.cmu.ac.th/cmdj/frontend/web/?r=site/viewarticle&id=183

Suphapraphawanit, S., Kanjantra, P. & Thong-ngarm, W. (2017). Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives. CM Dent J, 38(1), 49-62. Retrieved from: https://www.dent.cmu.ac.th/cmdj/frontend/web/?r=site/viewarticle&id=183

Suphapraphawanit, S., Kanjantra Pavisuth and Thong-ngarm Weeranuch. 2017. "Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives." CM Dent J, 38(1), 49-62. https://www.dent.cmu.ac.th/cmdj/frontend/web/?r=site/viewarticle&id=183

Suphapraphawanit, S. et al. 2017. 'Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives', CM Dent J, 38(1), 49-62. Retrieved from https://www.dent.cmu.ac.th/cmdj/frontend/web/?r=site/viewarticle&id=183

Suphapraphawanit, S., Kanjantra, P. and Thong-ngarm, W. "Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives", CM Dent J, vol.38, no. 1, pp. 49-62, Jan. 2017.

Suphapraphawanit Siwaphon , Kanjantra Pavisuth, Thong-ngarm Weeranuch "Effect of Dark Cure Activators in Resin Cements on Shear Bond Strength of Self-etch Adhesives." CM Dent J, vol.38, no. 1, Jan. 2017, pp. 49-62, https://www.dent.cmu.ac.th/cmdj/frontend/web/?r=site/viewarticle&id=183