title: Effects of three canal sealers on bond strength of a fiber post.
abstract: BACKGROUND
  This study evaluated the effects of three different endodontic sealers on the bond strength of a fiber post cemented with adhesive resin cement.
  
  
  METHODS
  Forty-eight extracted maxillary central incisors were prepared with the step-back technique and randomly divided into four groups (n=12 for each group): group 1, control group (gutta-percha points only, no sealer); group 2, resin-based sealer (AH plus; Dentsply De Trey GmbH, Konstanz, Germany); group 3, zinc oxide-eugenol-based sealer (Endofill; Produits Dentaires SA, Vevey, Switzerland); and group 4, calcium hydroxide-based sealer (Sealapex; Kerr, Romulus, MI). The roots were obturated with gutta-percha using the cold lateral compaction technique. Fiber posts were cemented into the prepared post spaces with the adhesive resin cement Panavia F 2.0 (Kuraray Medical, Okayama, Japan). A push-out test was performed in a universal machine, and failure modes were observed. Morphologic changes of the root canal dentin surfaces were examined with scanning electron microscopy (SEM).
  
  
  RESULTS
  One-way analysis of variance revealed that sealers have significant effects on bond strength (p<0.05). The control group had the highest mean push-out bond strength. No statistical difference was detected between the eugenol-based sealer group and the resin-based sealer group (p>0.05). The root surfaces were covered with the smear layer and debris in all the groups after post space preparation in SEM analysis. However, some of the dentin tubules were partially open in the control and calcium hydroxide-based sealer groups after the application of the resin monomer.
  
  
  CONCLUSIONS
  The results of this study showed that the type of canal sealer and chemomechanical preparation of the root canals affect the bond strength of a fiber post cemented with resin cement.
authors.affiliation: Department of Dentistry, Samsun, Turkey. eozsezer@omu.edu.tr
authors.forename: Ebru Ozsezer
authors.initials: EO
authors.lastname: Demiryürek
authors.forename: Safak
authors.initials: S
authors.lastname: Külünk
authors.forename: Gözde
authors.initials: G
authors.lastname: Yüksel
authors.forename: Duygu
authors.initials: D
authors.lastname: Saraç
authors.forename: Bilinç
authors.initials: B
authors.lastname: Bulucu
mesh_terms: D000704:Analysis of Variance; D002484:Cementation; D001840:Dental Bonding; D017005:Dental Debonding; D017268:Dental Prosthesis Retention; D003786:Dental Pulp Cavity / Q000187:drug effects / Q000648:ultrastructure; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D004853:Epoxy Resins / Q000737:chemistry* / Q000627:therapeutic use; D006171:Gutta-Percha / Q000737:chemistry / Q000627:therapeutic use; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D008437:Maxilla; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry* / Q000627:therapeutic use; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000627:therapeutic use
chemical_list: D004853:Epoxy Resins; C438843:Panavia-Fluoro; D019279:Resin Cements; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; D006171:Gutta-Percha