title: Push-out Bond Strength of Glass Fiber Posts Cemented in Weakened Roots with Different Luting Agents.
abstract: OBJECTIVE
  To evaluate the push-out bond strength (BS) of direct anatomic posts (DAPs) and conventional fiber posts (CFPs) cemented with different luting agents in different thirds of flared root canals.
  
  
  METHODS
  A total of 60 human single-rooted canine teeth were transversally sectioned 16 mm from the radicular apex. After endodontic treatment, canals were flared with diamond burs. Samples were divided into six groups according to post type and luting agent: DAP and RelyX U100 (RXU); DAP and RelyX ARC (RXA); DAP and RelyX Luting 2 (RXL); CFP and RXU; CFP and RXA; CFP and RXL. Roots were sectioned transversely into six 1-mm-thick slices. The push-out test was performed and failure modes were observed.
  
  
  RESULTS
  The DAP groups (7.23 ± 2.05) showed highest BS values (p < 0.05) when compared with CFP (5.93 ± 1.76). RelyX U100 (8.17 ± 1.70) showed higher BS values (p < 0.05) than RXA (6.46 ± 1.38), and RXL (5.10 ± 1.65) showed the lowest values. Bond strength on the apical third was statistically lower (p < 0.05) than that on the other thirds of the root canals. There was a predominance of adhesive failure for all groups.
  
  
  CONCLUSIONS
  The DAPs improved retention in flared root canals, and RXU was the most effective luting agent. The apical third showed the lowest BS values.
  
  
  CONCLUSIONS
  The relining procedure of fiber posts with composite and the proper selection of luting resin cement are important for increasing bonding effectiveness in flared root canals.
authors.affiliation: Health Sciences Postgraduate Program, Health Sciences School, University of Brasilia, UnB, Brasilia, Distrito Federal, Brazil.
authors.forename: Daniele M
authors.initials: DM
authors.lastname: da Silveira-Pedrosa
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba Sao Paulo, Brazil.
authors.forename: Luis Rm
authors.initials: LR
authors.lastname: Martins
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba Sao Paulo, Brazil.
authors.forename: Mário Ac
authors.initials: MA
authors.lastname: Sinhoreti
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, UNICAMP, Piracicaba Sao Paulo, Brazil.
authors.forename: Lourenço
authors.initials: L
authors.lastname: Correr-Sobrinho
authors.affiliation: Department of Restorative Dentistry, Ribeirão Preto Dental School, University of Sao Paulo, USP, Ribeirão Preto, Sao Paulo, Brazil.
authors.forename: Manoel D
authors.initials: MD
authors.lastname: Sousa-Neto
authors.affiliation: Department of Dentistry, Health Sciences School, University of Brasilia, UnB, Brasilia, Distrito Federal, Brazil.
authors.forename: Edson D
authors.initials: ED
authors.lastname: Costa
authors.affiliation: Department of Dentistry, Health Sciences School, University of Brasilia, UnB, Brasilia, Distrito Federal, Brazil.
authors.forename: Celso
authors.initials: C
authors.lastname: de F Pedrosa-Filho
authors.affiliation: Professor, Department of Dentistry, Health Sciences School, Campus Universitario Darcy Ribeiro, Departamento de Odontologia-FS/UnB. Asa Norte, CEP: 70910-900 Brasilia, DF, Brazil, Phone: +556131071802, e-mail: jacy@unb.br.
authors.forename: Jacy Ribeiro
authors.initials: JR
authors.lastname: de Carvalho
mesh_terms: D003188:Composite Resins; D003481:Cuspid; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry; D003793:Dental Restoration, Permanent / Q000295:instrumentation*; D003799:Dental Stress Analysis; D005898:Glass; D006801:Humans; D066298:In Vitro Techniques; D011176:Post and Core Technique; D018915:Root Canal Preparation; D014092:Tooth Root
chemical_list: D003188:Composite Resins; D003738:Dental Cements; C009753:fiberglass
keywords: Dentin; Fiber posts; Push-out bond strength; Resin composite cements; Self-adhesive resin cements.