Push-out bond strength for bioceramic and epoxy resin-based sealers

The push-out bond strength between bioceramic and epoxy resin-based cement materials that treat endodontically treated teeth is of interest to dentist. The push-out bond strength tests were applied to forty premolars after instrumenting and obturating them with either bioceramic or epoxy resin-based sealer materials. The bond strength measurements during the push-out test indicated epoxy resin-based sealer achieved 6.4 ± 0.6 MPa while the bioceramic sealer produced 5.2 ± 0.8 MPa with p < 0.05 indicating substantial statistical difference. The main failure mode in samples with bioceramic sealer involved adhesive breakdown whereas epoxy resin-based sealers demonstrated both cohesive and mixed failure patterns. The bond strength results indicate epoxy resin-based products outperform other products in both adhesion and mechanical interlocking properties which merits deeper examination about their extended clinical utilization.