title: In vitro evaluation of the effect of different endodontic sealers on retentive strength of fiber posts.
abstract: OBJECTIVE
  There is limited information in the literature regarding the effect of different endodontic sealers on the bond strength of fiber posts luted with core buildup materials. The purpose of this study was to evaluate the effect of three different root canal sealers on the retentive strength of prefabricated fiber posts luted with a composite resin cement.
  
  
  METHODS
  Fifty-four extracted single-rooted mandibular premolar teeth were prepared and randomly divided into three groups. The first two groups were obturated with gutta-percha and one of two eugenol-based root canal sealers (Endofil, Tubli-Seal). The third group (control) was obturated with gutta-percha and a resin-based root canal sealer (AH26). Prefabricated fiber posts were luted into the prepared post spaces with a composite resin cement (Multicore Flow). The pullout forces required for dislodgment of posts from their prepared post spaces were recorded. Data were collected and statistically analyzed.
  
  
  RESULTS
  The AH26 group had significantly greater retentive strengths for the posts when compared with the Endofil and Tubli-Seal (eugenol-based sealers) groups (p<0.0001). There was no significant difference between the means of the retentive strengths for the Endofil and Tubli-Seal groups (p=0.745).
  
  
  CONCLUSIONS
  The chemical formulation of root canal sealers significantly affected the retentive strength for prefabricated fiber posts luted with a resin cement. Eugenol-based sealers significantly reduced the bond strength of prefabricated fiber posts luted with resin cement.
authors.forename: K
authors.initials: K
authors.lastname: AlEisa
authors.forename: Z N
authors.initials: ZN
authors.lastname: Al-Dwairi
authors.forename: E
authors.initials: E
authors.lastname: Lynch
authors.forename: C D
authors.initials: CD
authors.lastname: Lynch
mesh_terms: D001641:Bicuspid; D001729:Bismuth / Q000627:therapeutic use; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D004853:Epoxy Resins / Q000627:therapeutic use; D006801:Humans; D066298:In Vitro Techniques; D011176:Post and Core Technique; D019279:Resin Cements / Q000627:therapeutic use*; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012834:Silver / Q000627:therapeutic use; D014025:Titanium / Q000627:therapeutic use; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use
chemical_list: D004853:Epoxy Resins; D019279:Resin Cements; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C074417:Endo-Fill; D012834:Silver; C028044:epoxy resin AH-26; C048769:tubliseal; D014025:Titanium; D001729:Bismuth