effect of different irrigants applied after post space preparation on pushout bond strength of a self-etch resin cement

Objectives: the aim was to investigate the effect of intracanal irrigants and agents on the bond strength of intraradicular fiber posts to dentin. materials and methods: root canals of 72 decoronated single-rooted premolars were cleaned, shaped, and obturated with gutta-percha and ah26. the specimens were incubated at 37oc and 100% humidity for seven days. next, the coronal 10 mm of the canals were prepared to receive size 2 d.t. light fiber post, and the specimens were randomly allocated into six groups according to the irrigants used after post space preparation: normal saline (control group), 5.25% sodium hypochlorite (naocl)/15 seconds, 17% ethylenediaminetetraacetic acid (edta)/60 seconds, 2% chlorhexidine (chx)/5 minutes, mtad/5 minutes, and acid-etching/15 seconds. all canals were rinsed with normal saline and dried. fiber posts were cemented using panavia f2.0. after 24 hours, two mid-root slices of 1mm thickness were obtained from each specimen. push-out bond strength test was performed in a universal testing machine at 0.5mm/minute. the maximum applied load was recorded, and the bond strength was calculated in megapascal (mpa). data were analyzed by one-way analysis of variance (anova) and tukey's test. results: the mean shear bond strengths of etched (53.21±12.11 mpa), mtad (52.47±14.75 mpa) and edta (49.08±10.19 mpa) groups were significantly higher than that of the control group (39.82±10.04 mpa). the difference was marginally significant for chx group (49.8±13.57 mpa) and not significant for naocl group (47.15±17.64 mpa). conclusions: etching or irrigating the root canals with mtad or edta after post space preparation increases the bond strength of panavia f2.0 to dentin.