Influence of endodontic sealers on the bond strength of carbon fiber posts

Objective: The aim of this study was to verify the influence of endodontic sealers on the bond strength of an adhesive system and a resin cement used for carbon posts cementation. Methods: Thirty extracted human premolars were instrumented and randomly divided into three groups according to the tested sealer: EndoFill, Sealapex, or EndoREZ. Specimens were stored at 37°C. After 48 h, half of specimens were prepared to receive the post and the others after 7 days. The posts were cemented with Adper Single Bond/Rely X ARC and stored in distilled water at 37°C for 7 days. After this period, the specimens were sectioned in three slices (coronal, middle, and apical). The push‐out test was performed in a universal machine and the debonded area was examined in a stereomicroscope. Results: Data were submitted ANOVA and Tukey test ( α = 0.05). The EndoFill showed lower bond strength than other sealers ( p < 0.01). The EndoREZ sealer was statistically greater than other groups for coronal and middle portions and similar for apical portion ( p > 0.05). Coronal and middle portions showed the best results for all groups, mainly when the canal preparation was performed after 48 h ( p < 0.01). Mixed failure occurs with more frequency (55.6%) followed by failure in adhesive‐dentin interface (34.4%) and adhesive‐post interface (10.0%). Conclusion: The use of EndoREZ sealer promoted higher bond strength in root coronal and middle portions when carbon post was fixed with a resin cement. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 2008