Salicylate resin-based sealer: effects on the adhesiveness of fiber posts

Method: Sixty bovine roots (16mm-length) were divided into six groups (n=10), considering an experimental design with 2 factors (factorial 3x2): endodontic sealer factor in 3 levels (epoxy resin-based sealer [AH Plus], eugenol-based sealer [Endofill], salicylate-based sealer plus MTA [MTA Fillapex]) and time for post cementation factor in 2 levels (immediate fiber post luting or cementation after 15 days). The posts were luted with adhesive system and dual resin cement. The roots were sectioned transversally to produce 1-mm-thick slices to be micro-pushed-out. The failure modes were analyzed under 40x stereomicroscope and scored as: adhesive at cement/dentin interface; adhesive at cement/post interface; cement cohesive; post cohesive; dentin cohesive; or mixed. Data were analyzed using two-way ANOVA and Tukey post-hoc test (P<0.05). 

Result: When the glass fiber posts were luted immediately after the root canal filling, the bond strengths were similar, independently of the endodontic sealer. However, after fifteen days, the epoxy resin-based sealer presented higher bond strength than the other sealers. The main failure type was adhesive at dentin/cement interface. 

Conclusion: The bond strength of glass fiber posts is more related to the kind of endodontic sealer; but time for cementation had no effect for each endodontic sealer.