title: Effect of three endodontic sealers on the bond strength of prefabricated fiber posts luted with three resin cements.
abstract: BACKGROUND
  There is limited information in the literature regarding the effect of eugenol-based sealers on the bond strength of resin-bonded endodontic posts.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the effect of 1 resin-based and 2 different eugenol-based endodontic sealers on the bond strength of prefabricated fiber posts luted with 3 different resin cements.
  
  
  METHODS
  One hundred thirty-five prefabricated fiber posts were luted into extracted single-rooted teeth with 1 of 3 composite resin cements (Rely X Unicem, Paracore, and Variolink II). Specimens were divided into 3 groups with 45 teeth each. The first 2 groups were obturated with gutta percha and 1 of 2 eugenol-based endodontic sealers (Endofil, Tubli-Seal). The third group was obturated with a resin-based root canal sealer (AH26). The forces required for dislodgment of posts from their prepared post spaces were recorded by using a universal testing machine. Data were collected and a 2-way ANOVA was applied to the mean retentive strengths of various combinations of sealer and cement. A Tukey multiple comparison test was performed to determine which groups were significantly different (α=.05).
  
  
  RESULTS
  Endofil and Tubli-Seal (eugenol-based sealers) groups had significantly lower bond strengths for the posts than the AH26 group (P<.001). There was no significant difference between the means of post bond strength for the Endofil and Tubli-Seal groups. There was significant difference among the means of post bond strength for all 3 cement groups (P<.05).
  
  
  CONCLUSIONS
  Endofil and Tubli-Seal (eugenol-based) sealers demonstrated significantly reduced mean bond strength for prefabricated fiber posts luted with resin cement. Rely X Unicem resin cement exhibited higher mean bond strength than with Paracore and Variolink II resin cements when a eugenol sealer was used.
authors.affiliation: Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
authors.forename: Khalil
authors.initials: K
authors.lastname: Aleisa
authors.forename: Rawda
authors.initials: R
authors.lastname: Alghabban
authors.forename: Khalid
authors.initials: K
authors.lastname: Alwazzan
authors.forename: Steven M
authors.initials: SM
authors.lastname: Morgano
mesh_terms: D000704:Analysis of Variance; D001729:Bismuth; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D004853:Epoxy Resins; D006801:Humans; D011176:Post and Core Technique; D019279:Resin Cements; D012387:Root Canal Filling Materials; D012834:Silver; D018709:Statistics, Nonparametric; D014025:Titanium; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D003188:Composite Resins; 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