Effect of Different Sealers and Irrigants on the Push-Out Bond Strength of Fiber Posts to The Root Canal.

INTRODUCTION

This study evaluated the effects of bioceramic and resin-based root canal sealers and different irrigation protocols on the push-out bond strength (PBS) of fiber posts.

METHODS

Fifty-four freshly extracted mandibular canines were instrumented and irrigated with NaOCl and EDTA. The specimens were first divided into two groups based on the sealer used: a bioceramic sealer (Bioserra) or a resin-based sealer (AH Plus) (n=27 per group). Each group was then randomly subdivided into three subgroups (n=9) based on the irrigation solution used for smear layer removal during post space preparation: distilled water, 17% EDTA, or 0.2% chitosan. Fiber posts were cemented with self-adhesive resin cement. Sections (1.5-mm thick) from the coronal third were subjected to a push-out bond strength test. Data was analyzed using two-way ANOVA and post hoc Bonferroni tests (α=0.05).

RESULTS

Both the type of sealer and the irrigation protocol significantly influenced PBS values (P<0.05). The highest PBS was observed in the bioceramic sealer+chitosan group (16.08±0.48 MPa), whereas the lowest value was recorded in the bioceramic sealer+distilled water group (11.20±0.58 MPa).

CONCLUSION

Root canal sealer type and irrigation protocol during post space preparation significantly affected the bond strength of fiber posts. Chitosan irrigation demonstrated superior performance, suggesting its potential to improve post retention.