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Quintessence International
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Quintessence Int 38 (2007), No. 5     27. Apr. 2007
Quintessence Int 38 (2007), No. 5  (27.04.2007)

Page 387-394, PubMed:17568837


Effect of the activation mode of post adhesive cementation on push-out bond strength to root canal dentin
Boff, Luis Leonildo / Grossi, Márcio Lima / Prates, Luiz Henrique Maykot / Burnett, Luiz Henrique / Shinkai, Rosemary Sadami Arai
Objective: To evaluate the effect of the activation mode of adhesive cementation on push-out bond strength of fiber-reinforced resin posts to root canal dentin.
Method and Materials: Forty mandibular premolars were endodontically treated and randomly divided into 4 equal groups. In groups G-1, G-2, and G-3, Single Bond (3M Espe) was applied and light polymerized for 20 seconds; in group G-4, Scotchbond Multi-Purpose Plus (3M Espe) was used as an autopolymerized adhesive. The dual-cure resin cement Rely X ARC (3M Espe) was light polymerized in G-2 and G-3 but not in G-1 and G-4. The translucent post Light-Post (Bisco) was used in G-3 and the opaque post Aestheti-Plus (Bisco) in the other groups. The roots were sectioned in 3 parts (cervical, middle, apical); each slice was submitted to the push-out test at a crosshead speed of 0.5 mm/min. Data were analyzed by analysis of variance and Tukey test (a = .05).
Results: Light polymerization of both the adhesive and resin cement in G-2 led to significantly higher bond strength than in G-1, where only the adhesive was light polymerized. No difference was found between G-2 (opaque post) and G-3 (translucent post). The autopolymerized adhesive showed the highest bond strength in all root regions. The middle and apical post/root regions had similar bond strength, but it was significantly lower than that in the cervical region (P < .001).
Conclusion: Bond strength to root dentin varied as a function of the activation mode of post adhesive cementation and post/root regions.

Keywords: adhesive systems, fiber-reinforced resin post, push-out bond strength