Int Endod J April 2011 - Effect of root canal sealers on bond strength of fibreglass posts cemented with self-adhesive resin cements

Effect of root canal sealers on bond strength of fibreglass posts cemented with self-adhesive resin cements.

D. Cecchin, A. P. Farina, M. A. Souza, B. Carlini-Ju ́ nior & C. C. R. Ferraz

Aim 

This study evaluated the effects of different root canal sealers on the bond strength of a fibreglass post cemented with self-adhesive resin cements. 

Methodology 

The root canals of 50 extracted max- illary single-rooted canine teeth were prepared with the crown-down technique and randomly divided into five groups according to the sealer used: group 1: control group, gutta-percha points only (no sealer); group 2: AH Plus (resin-based sealer); group 3: self-etch Epip- hany (resin-based sealer); group 4: Sealer 26 (calcium hydroxide-based sealer); and group 5: Endomethasone (zinc oxide eugenol-based sealer). The root canals were filled with gutta-percha, the cold lateral compaction technique, except for group 3 where Resilon was used. Post spaces were prepared, and fibreglass posts were cemented with the self-adhesive cement RelyX Unicem. Bonded specimens were sectioned into 1-mm-thick slabs, and a push-out test was performed in a universal machine. Failure modes were observed and classified into five types: (i) adhesive between the post and resin cement; (ii) mixed, with resin cement covering 0–50% of the post diameter; (iii) mixed, with resin cement covering 50–100% of the post surface; (iv) adhesive between resin cement and root canal; and (v) cohesive in dentine. Data of bond strength were submitted to anova and Tukey test (a = 0.05).

Results 

No significant difference was detected between control group, AH Plus, Epiphany and Sealer 26 (P > 0.05). The Endomethasone group had signif- icantly lower bond strength values than the other sealers (P < 0.05). The prevalence of mixed fractures and adhesive cement-dentine failure was verified in the eugenol-containing sealer group; in the control group, the resin-based and calcium hydroxide-based sealer groups, the predominant mode of failure was the mixed type.

Conclusion 

Endomethasone interfered negatively with the bond to root dentine; however, AH Plus, Epiphany and Sealer 26 did not interfere in the bond strength of a fibreglass post cemented with self-adhesive resin cements.

Keywords: bond strength, fibreglass post, push-out, root canal sealers, self-adhesive.

International Endodontic Journal, 44, 314–320, 2011.

Download Paper in PDF