title: Effect of surface treatments on fracture resistance of root filled teeth with bonded fibre posts.
abstract: OBJECTIVE
  This study examined the effect of several dentin surface treatments on fracture resistance of root filled teeth containing bonded fibre posts.
  
  
  METHODS
  The roots of 84 single-canal premolars were instrumented, filled with gutta-percha and randomly divided into seven groups. The coronal 9 mm of gutta-percha was removed to create a post space. In the experimental groups, canals were irrigated with distilled water, 37% phosphoric acid, 5% sodium hypochlorite, 17% EDTA, 5% sodium hypochlorite followed by 17% EDTA or 5% sodium hypochlorite followed by 10% ascorbic acid. Fibre posts were cemented using Panavia F2.0 resin cement, and the specimens were mounted in acrylic resin blocks. Following 1-week storage in an incubator, specimens were thermocycled and their fracture resistance was determined using a universal testing machine. Data were analysed using the Kruskal-Wallis test.
  
  
  RESULTS
  Mean fracture resistance values ranged from 465.8 N in specimens treated with sodium hypochlorite and ascorbic acid to 739.1 N for those treated with sodium hypochlorite only. However, differences in fracture resistance were not statistically significant (P = 0.114).
  
  
  CONCLUSIONS
  None of the surface treatments improved vertical fracture resistance of root filled teeth containing bonded fibre posts.
authors.affiliation: Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Atiyeh
authors.initials: A
authors.lastname: Feiz
authors.forename: Pooran
authors.initials: P
authors.lastname: Samimi
authors.forename: Ali
authors.initials: A
authors.lastname: Karami
authors.forename: Hamid
authors.initials: H
authors.lastname: Badrian
authors.forename: Hossein
authors.initials: H
authors.lastname: Goroohi
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Swift
mesh_terms: D001840:Dental Bonding; D006801:Humans; D066298:In Vitro Techniques; D011176:Post and Core Technique; D012389:Root Canal Obturation; D013499:Surface Properties; D014082:Tooth Fractures
keywords: fibre posts; fracture resistance; root canal irrigation; vertical root fracture