The Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing 210029, China） [Abstract] Objective To study the effects of two different endodontic sealers on the bond strength of two fiber posts cemented with adhesive resin cement. Methods Twenty-eight crownless human maxillary central incisors were prepared with the step-back technique and randomly divided into four groups according endodontic sealer and fiber: Group A, Cortisomol sealer+Matchpost fiber post; Group B, Cortisomol sealer+Macrolock fiber post; Group C, Guttaflow sealer+Matchpost fiber post; Group D, Guttaflow sealer+Macrolock fiber post. One week after fiber posts were bonded, a thin-slice push-out test was performed in a universal machine. Morphologic structure of the root canal dentin surfaces etched and the adhesive interfaces were examined by scanning electron microscopy（SEM）. Results The bond strengths of 4 groups were （7.06±3.22）, （9.31±3.61）, （6.90±3.13）, （9.71±3.42）MPa. The bond strengths of group B and D were significantly higher than that of group A and C（P0.05）. The cervical third had the highest mean push-out bond strength, next to middle third and apical third（P
