Effect of pre-mixing temperature of resin cement on the push-out bond strength of fiber posts to intraradicular dentin

Abstract

Various factors influence the interfacial bond between fiber posts and intraradicular dentin. The aim of the present study was to evaluate the effect pre-warming of resin cement on the push-out bond strength of fiber posts to various segments of intraradicular dentin. Materials and methods: In this in vitro study, 40 single-rooted human premolars were decoronated and underwent root canal treatment along with post space preparation. The samples were randomly divided into two groups: In group 1, Panavia 0.2 cement was used at room temperature; in group 2, the same cement was warmed to 55-60C before mixing. After fiber posts were placed and cemented in the root canals, 3 dentin/post sections (coronal, middle and apical) with a thickness of 2 mm was prepared. A universal testing machine was used to measure push-out bond strength in MPa. Data was analyzed with two-factor ANOVA and a post hoc Tukey test at =0.05. Results: There were significant differences in the means of push-out bond strength values between the two resin cement temperatures and between different root segments; however, the interactive effect of temperature and various root segments was not significant. Conclusion: Pre-warming of Panavia 0.2 resin cement up to 55-60C reduces bond strength to intraradicular dentin.