Onay, Emel OlgaUngor, MeteAri, HaleBelli, SemaOgus, Ersin2020-03-262020-03-2620091079-2104https://dx.doi.org/10.1016/j.tripleo.2009.01.023https://hdl.handle.net/20.500.12395/23800Conference of the International-Association-of-Dental-Research-Pan-European-Federation -- SEP 10-12, 2008 -- London, ENGLANDObjective. The objective of this study was to compare the interfacial strengths and failure modes of new polymeric endodontic obturation systems consisting of different material combinations. Study design. Extracted human single-rooted teeth (n = 105) were instrumented using HERO Shaper rotary instruments and obturated with different combinations of core and sealer as follows: group 1, RealSeal/Resilon; group 2, RealSeal/Herofill; group 3, Hybrid Root Seal/Resilon; group 4, Hybrid Root Seal/Herofill; group 5, MM-Seal/Resilon; group 6, MM-Seal/Herofill; group 7 ( control). Failure modes of root slices (1.00 +/- 0.05-mm thick) after push-out testing were examined with stereomicroscope and scanning electron microscopy. Results. Hybrid Root Seal/Resilon combination had significantly greater bond strength than all the other groups (P < .001); RealSeal/Resilon combination proved to have the second highest bond strength (P < .001). Bond failure was mainly mixed failure in both adhesive and cohesive modes at the dentin/sealer interface. Conclusion. The push-out bond strengths of methacrylate-based sealers (Hybrid Root Seal and RealSeal) and thermoplastic synthetic-polymer-based core material (Resilon) combinations were higher than epoxy-resin-based sealer (MM-Seal) and gutta-percha (Herofill) combination. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2009;107:879-885)en10.1016/j.tripleo.2009.01.023info:eu-repo/semantics/closedAccessArticle107687988519386522N/AWOS:000266278300033Q2