push-out bond strength of intra-orifice barrier materials: bulk-fill composite versus calcium silicate cement

Background. the aim of this study was to compare the push-out bond strengths of calcium silicate-based proroot mta and biodentine cements and surefil sdr and everx posterior bulk-fill composite resins. methods. twenty-four single-rooted maxillary central incisors were sectioned below the cementoenamel junction, and the root canals were instrumented using rotary files. thereafter, a parallel post drill was used to obtain a standardized root canal dimension. the roots were randomly assigned to one of the following groups with respect to the intra-orifice barrier used: proroot mta; biodentine; surefil sdr; everx posterior. five 1-mm-thick sections were obtained from the coronal aspect of each root. push-out bond strength testing was performed and data were analyzed with kruskal-wallis and post hoc dunn tests (p<0.05). results. surefil sdr and everx posterior bulk-fill composite resins’ bond strengths were significantly higher than proroot mta and biodentine calcium silicate cements. however, no statistically significant differences were observed between bulk-fill composite resins values and calcium silicate cement values. conclusion. within the limitations of present study, calcium silicate-based proroot mta cement’s push-out bond strength was lower than those of biodentine, surefil sdr and everx posterior materials.