Effects of different irrigation agents on the bond strength of fiber posts to dentin structure

Purpose: This study aims to investigate the push-out bond strength of fiber-reinforced posts following passive ultrasonic activation of the post space using EDTA, MTAD, Dual Rinse, and SmearOFF as final irrigation solutions, and to classify the associated modes of bond failure.
Methods: A total of 60 human mandibular premolar teeth were instrumented and obturated using a bioceramic-based root canal sealer. Post spaces were prepared using a fiber post drill set, maintaining 5 mm of the apical canal filling remained, and the samples were randomly divided into four groups (EDTA; MTAD; Dual Rinse; SmearOFF) (n=15). Intermittent passive ultrasonic activation protocols were applied to the final rinsing solutions. Fiber-reinforced posts were cemented into the post spaces using the self-adhesive resin cement Panavia SA Cement Universal.
Results: No statistically significant differences were found among the different final irrigation protocols applied. Although there was no statistical difference in the main effect, the main effect strength was highest in the EDTA group and lowest in the Dual Rinse group. Adhesive failure was the most frequently observed failure mode, while cohesive failures were observed at the lowest level.
Conclusion: EDTA, Dual Rinse, MTAD, and SmearOFF solutions have demonstrated comparable effects for post-space irrigation.

Keywords: Dual rinse, EDTA, SmearOFF, MTAD, push-out.