title: Influence of endodontic sealers on the bond strength of carbon fiber posts.
abstract: 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 degrees 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 degrees 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 (alpha = 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%).
  
  
  CONCLUSIONS
  The use of EndoREZ sealer promoted higher bond strength in root coronal and middle portions when carbon post was fixed with a resin cement.
authors.affiliation: School of Dentistry, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
authors.forename: C S
authors.initials: CS
authors.lastname: Teixeira
authors.forename: B
authors.initials: B
authors.lastname: Pasternak-Junior
authors.forename: A H
authors.initials: AH
authors.lastname: Borges
authors.forename: S M
authors.initials: SM
authors.lastname: Paulino
authors.forename: M D
authors.initials: MD
authors.lastname: Sousa-Neto
mesh_terms: D002244:Carbon; D000077482:Carbon Fiber; D003188:Composite Resins; D001840:Dental Bonding; D017268:Dental Prosthesis Retention; D004708:Endodontics; D006801:Humans; D010895:Pit and Fissure Sealants; D011176:Post and Core Technique; D019279:Resin Cements; D012390:Root Canal Therapy
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; C481259:EndoRez; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D002244:Carbon