Effect of different post space irrigation procedures on the bond strength of a fiber post attached with a self-adhesive resin cement

Abstract

Statement of problem: The effects of different post space irrigation procedures on the bond strength of a self-adhesive resin cement to the root canal dentin are still unclear.

Purpose: The purpose of this in vitro study was to evaluate the effects of alternative post space irrigation procedures on the cement strengths of posts attached with a self-adhesive resin cement.

Material and methods: Forty single-rooted teeth were selected, and after root canal preparation and obturation, post spaces were prepared. The teeth were divided into 4 groups corresponding to the post space irrigation procedure and treated as follows: the distilled water (DW) group (control) received 15 mL of distilled water; the NaOCl+ethylenediaminetetraacetic acid (EDTA) group was treated with 5 mL of 5.25% NaOCl, 5 mL of 17% EDTA, and 5 mL of distilled water; the chlorhexidine (CHX) group was treated with 15 mL of 2% chlorhexidine solution; and the phosphoric acid (PA) group treatment consisted of etching the walls of the prepared post holes with 35% phosphoric acid. Fiber posts were attached with a self-adhesive resin cement, and specimens were cut horizontally for push-out testing. The statistical evaluation consisted of 1-way ANOVA with the post hoc Tukey honest significant differences test (α=.05).

Results: The NaOCl+EDTA treatment yielded a significantly higher bond strength than those used in the other 3 groups (P=.003). No statistically significant differences were found among any of the other groups, as different root regions showed similar bond strength values (P>.05).

Conclusions: The results showed that EDTA in combination with NaOCl could be advantageous for post space irrigation when fiber posts are bonded with a self-adhesive resin cement.