the effects of various endodontic irrigants on the push-out bond strength of calcium-enriched mixture cement and mineral trioxide aggregate

introduction: the aim of this in vitro study was to evaluate the effect of various irrigants on the push-out bond strength of calcium-enriched mixture (cem) cement and mineral trioxide aggregate (mta). methods and materials: a total of 140 dentin disks with a thickness of 1.5±0.2 mm and lumen size of 1.3 mm, were randomly divided into 12 groups ( n =10) and 4 control groups ( n =5). the lumen of disks in groups 1, 2, 3, 7, 8, 9 were filled with cem and groups 4, 5, 6, 10, 11, 12 were filled with mta. control groups were filled with cem and mta. specimens were incubated at 37 ° c for one day in groups 1 to 6 and seven days in groups 7 to 12. after incubation the samples were divided into three subgroups ( n =10) that were either immersed for 30 min in 5.5% sodium hypochlorite (naocl), 2% chlorhexidine (chx) or saline solution. the push-out bond strength values were measured by using a universal testing machine. the nature of the failures were determined by light microscope. data was analyzed using the three-way anova to evaluate the effect of material type, different irrigants and time intervals. post hoc tukey’s test was used for two-by-two comparison of the groups. results: cem cement significantly showed a higher push-out bond strength in comparison with mta ( p =0.001). the elapse of time significantly increased the bond strength ( p =0.001). there was no significant difference between the irrigants used in this study ( p =0.441). bond failure was predominantly of mixed type in mta and of cohesive type in cem samples. conclusion: based on this study, endodontic irrigants did not influence the push-out bond strength of mta and cem cement.