Effects of Two Luting Agents and VariousSpecimen Thicknesses on The push-Out BondStrength of Fibre Posts to Root Canal Dentine

Objectives: The aim of this in vitro study was to investigate the effects of two luting agents and various specimen thicknesses on the bond strength of fibre posts to root canal dentine. Methods: Sixty central incisors were sectioned below the cement enamel junction. Following standardized post-space preparations, the roots were divided into two luting agent groups, and further divided into three subgroups of 10 specimens each for the push-out test of the specimen thicknesses. Three specimens with different thicknesses were taken from the cervical, middle, and apical parts of each root. Push-out test was performed. Statistical analysis was performed with three-way ANOVA followed by independent t tests (α = 0.05). Results: Luting agent (P<0.001), specimen thicknesses (P<0.001), and the root regions (P<0.001) significantly affected bond strength values. Panavia F provided significantly higher mean bond strengths than Duo-Link (P<0.05). The highest values were obtained for 1-mm test specimens for all groups (P<0.05). The apical region of the root dentine had significantly higher bond strengths compared to the middle and cervical regions for Duo-Link (P<0.05). The region of the root did not affect the bond strengths to root dentine for Panavia F (P>0.05). Conclusion: Bond strengthswere affected significantly by luting agents and specimen thicknesses.