title: Influence of Cement Type and Relining Procedure on Push-Out Bond Strength of Fiber Posts after Cyclic Loading.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of cement type and relining procedure on push-out bond strength of fiber posts (FPs) after cyclic loading.
  
  
  METHODS
  Forty bovine incisor roots were divided into four groups: group 1, FP luting with RelyX Unicem; group 2, FP relined with resin composite (FPC) luting with RelyX Unicem; group 3, FP luting with RelyX ARC; group 4, FPC luting with RelyX ARC. Afterwards, half the specimens were exposed to 250,000 cycles in a controlled chewing simulator. With the other half of the specimens in each group, the push-out test was performed 24 hours after FP luting (immediate groups). All roots were sectioned transversely, producing 1-mm-thick slices, and the push-out test was performed. Statistical analysis was performed using ANOVA and the Tukey test for post hoc comparisons (α = 0.05).
  
  
  RESULTS
  FPC had higher bond strengths than FP (p < 0.05). RelyX Unicem showed higher bond strength than RelyX ARC (p < 0.05). Cyclic loading did not significantly affect the bond strength value (p > 0.05).
  
  
  CONCLUSIONS
  The relining procedure and the cement type are important factors for the bond strength of FPs to root dentin.
authors: Department of Restorative Dentistry, Passo Fundo Dental School, State University of Campinas, Piracicaba, Brazil.
authors: Ana Paula
authors: AP
authors: Farina
authors: Department of Restorative Dentistry, Passo Fundo Dental School, State University of Campinas, Piracicaba, Brazil.
authors: Henrique
authors: H
authors: Chiela
authors: Department of Restorative Dentistry, Passo Fundo Dental School, State University of Campinas, Piracicaba, Brazil.
authors: Bruno
authors: B
authors: Carlini-Junior
authors: Department of Prosthodontics and Periodontology, Piracicaba School of Dentistry, UNICAMP, Piracicaba, Brazil.
authors: Marcelo Ferraz
authors: MF
authors: Mesquita
authors: Department of Restorative Dentistry, State University of Campinas, Piracicaba, Brazil.
authors: Daniela Cristina
authors: DC
authors: Miyagaki
authors: Department of Restorative Dentistry, State University of Campinas, Piracicaba, Brazil.
authors: Caio Cezar
authors: CC
authors: Randi Ferraz
authors: Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, IL.
authors: Cristina Mattos Pimenta
authors: CM
authors: Vidal
authors: Department of Restorative Dentistry, Passo Fundo Dental School, State University of Campinas, Piracicaba, Brazil.
authors: Doglas
authors: D
authors: Cecchin
mesh_terms: D000818:Animals; D002417:Cattle; D001840:Dental Bonding; D003738:Dental Cements; D003804:Dentin; D005899:Glass Ionomer Cements; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements
chemical_list: D003738:Dental Cements; D005899:Glass Ionomer Cements; D019279:Resin Cements
keywords: Bond strength; cyclic loading; fiber post; resin cement; root canal