a comparison of push-out bond strength of two endodontic sealers to root canal dentin: an in vitro study

statement of problem: adhesion to root canal dentin is one of the necessary characteristics of endodontic sealers. mta fillapex (angelus, londria, pr, brazil) is one of the recently introduced mta-based sealer. only a limited number of studies have evaluated the bonding of this sealer to the dentin, with conflicting results. objectives: the purpose of this study was to evaluate the bond strength of mta fillapex sealer) to root canal dentin compared to an epoxy resinbased sealer (ah26 sealer). materials and methods: twenty root blocks (6mm length) were acquired from the middle part of the extracted single-rooted central or lateral maxillary incisor roots and their lumens were enlarged to achieve a diameter of 1.3 mm. mta fillapex and ah26 were placed in the lumens of root blocks (n = 10). the specimens were kept in an incubator for 7 days, the roots were sectioned perpendicular to their long axis to achieve slices with thickness of 1 mm and the push-out test was carried out by a universal testing machine. results: the mean value of bond strength was 1.84 ± 0.7 mpa for ah26 and 0.19 ± 0.1 mpa for mta fillapex. the difference between the two groups was statistically significant (p < 0.001). conclusions: with in the limitation of this study, ah 26 showed significantly higher bond strength in comparison to mta fillapex. statement of problem: adhesion to root canal dentin is one of thenecessary characteristics of endodontic sealers. mta fillapex (angelus,londria, pr, brazil) is one of the recently introduced mta-based sealer.only a limited number of studies have evaluated the bonding of this sealerto the dentin, with conflicting results.objectives: the purpose of this study was to evaluate the bond strengthof mta fillapex sealer) to root canal dentin compared to an epoxy resinbasedsealer (ah26 sealer).materials and methods: twenty root blocks (6mm length) were acquiredfrom the middle part of the extracted single-rooted central or lateralmaxillary incisor roots and their lumens were enlarged to achieve adiameter of 1.3 mm. mta fillapex and ah26 were placed in the lumens ofroot blocks (n = 10). the specimens were kept in an incubator for 7 days,the roots were sectioned perpendicular to their long axis to achieve sliceswith thickness of 1 mm and the push-out test was carried out by a universaltesting machine.results: the mean value of bond strength was 1.84 ± 0.7 mpa for ah26and 0.19 ± 0.1 mpa for mta fillapex. the difference between the twogroups was statistically significant (p < 0.001).conclusions: with in the limitation of this study, ah 26 showed significantlyhigher bond strength in comparison to mta fillapex.