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Aim: To make a comparative evaluation of the effect of different post space irrigation procedures on the push-out bond strength of prefabricated fiber posts luted with self-adhesive resin cement in different root thirds (coronal, middle, and apical). Materials and methods: Sixty freshly extracted single-rooted teeth were selected, and after root canal preparation and obturation, standardized post spaces were prepared. Teeth were then randomly divided into four groups (n = 15), according to the different post space irrigants used: group I—distilled water (control); group II—17% ethylenediaminetetracetic acid (EDTA) + 2.5% sodium hypochlorite (NaOCl); group III—99% ethanol; group IV—SmearOFF. All solutions were maintained in the root canals for 60 seconds and dried with paper points. Prefabricated fiber posts were luted using the self-adhesive resin cement. The push-out test was carried out by applying a load using Instron Universal Testing Machine. Results: The results of the analysis of variance (ANOVA) and the post hoc Bonferroni tests revealed that the push-out bond strength was significantly affected by the different post space irrigants (p < 0.001). However, no significant difference in push-out bond strength was attained with reference to the different locations inside the canal (i.e., coronal, middle, and apical) (p > 0.05). Conclusion: Pretreatment of the post space using 99% ethanol resulted in highest bond strength with respect to prefabricated fiber posts luted with self-adhesive resin cement. The push-out bond strengths exhibited by both, the newly launched irrigant: SmearOFF and the combination of EDTA + NaOCl, were comparable. Clinical significance: Irrigation of post space after mechanical post space preparation is the central key to remove smear layer, open dentinal tubules along with achieving superior bond strength of fiber posts cemented with a self-adhesive resin cement to root dentin.

journal of operative dentistry and endodontics

Effect of Post Space Irrigation using Novel Irrigant: SmearOFF (containing Chlorhexidine and EDTA) on the Push-out Bond Strength of Fiber Posts luted with Self-adhesive Resin Cement