effect of different endodontic sealers on the push-out bond strength of fiber posts

introduction: the aim of this in vitro study was to evaluate the effect of mta-based sealer (mta fillapex), eugenol-based sealer (dorifill) and an epoxy resin sealer (ah plus) on the bond strength of fiber posts cemented with a self-etch adhesive. materials and methods: the root canals of 72 maxillary incisors were prepared using the step-back technique after removing/cutting off the crowns. the samples were randomly divided to 4 groups ( n =18). in group 1 (the controls) gutta-percha was used without sealer. in groups 2, 3 and 4, the canals were filled with gutta-percha using ah plus, dorifill and mta fillapex sealers, respectively, by cold lateral compaction technique. after post space preparation, the fiber posts were cemented in the root canals using self-etch adhesive. then 1-mm-thick disks were prepared from the coronal thirds of all the root canals and subjected to a push-out test. data were analyzed using the one-way anova and post hoc tukey’s tests. results: the maximum (4.45±0.09 mpa) and minimum (1.02±0.03 mpa) bond strength values were recorded in the control and dorifill groups, respectively. the mean push-out bond strength values were similar for mta fillapex and ah plus sealers ( p >0.05). however these values were significantly higher than that of the dorifill sealer ( p <0.05). conclusion: sealer type affected the bond strength of the fiber posts and mta fillapex decreased the dislodgment resistant of the fiber post.