title: Bond strength of fiber posts in different root thirds using resin cement.
abstract: OBJECTIVE
  The aim of the study was to assess the in vitro bond strength (BS) of glass fiber posts (GF) and carbon fiber posts (CF) in the cervical, middle, and apical thirds of root canals cemented with RelyX-Unicem (RX) and Cement-Post (CP).
  
  
  METHODS
  Forty maxillary canines were divided into 4 groups (n = 10) according to the cement and post used: group 1: GF and RX; group 2: CF and RX; group 3: GF and CP; group 4: CF and CP. The push-out test was applied in the cervical, middle and apical thirds of each specimen to assess bond strength of the cement/post complex to the root canal wall. The data obtained were submitted to ANOVA (Bonferroni test, p < 0.05), and fracture analysis was done with SEM.
  
  
  RESULTS
  The GF posts presented the best results when cemented with RX and with CP (p < 0.05). RX presented the highest BS values for both GF and CF (p < 0.05). For all the groups, BS was higher in the cervical third, followed by the middle and apical thirds. Fracture analysis showed a predominance of cohesive fracture of posts for RX, and a predominance of adhesive fracture between dentin/cement, and mixed failure mode for CP.
  
  
  CONCLUSIONS
  GF posts cemented with RX presented the highest BS values in all root thirds.
authors: Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, São Paulo University, Ribeirão Preto, São Paulo, Brazil.
authors: Ana Paula
authors: AP
authors: Farina
authors: Doglas
authors: D
authors: Cecchin
authors: Lucas da Fonseca Roberti
authors: Lda F
authors: Garcia
authors: Lucas Zago
authors: LZ
authors: Naves
authors: Lourenço Correr
authors: LC
authors: Sobrinho
authors: Fernanda de Carvalho Panzeri
authors: Fde C
authors: Pires-de-Souza