title: Push-out bond strength of fiber posts to root dentin using glass ionomer and resin modified glass ionomer cements.
abstract: OBJECTIVE
  The purpose of this study was to assess the push-out bond strength of glass fiber posts to root dentin after cementation with glass ionomer (GICs) and resinmodified glass ionomer cements (RMGICs).
  
  
  METHODS
  Fifty human maxillary canines were transversally sectioned at 15 mm from the apex. Canals were prepared with a step back technique until the application of a #55 K-file and filled. Post spaces were prepared and specimens were divided into five groups according to the cement used for post cementation: Luting & Lining Cement; Fuji II LC Improved; RelyX Luting; Ketac Cem; and Ionoseal. After cementation of the glass fiber posts, all roots were stored at 100% humidity until testing. For push-out test, 1-mm thick slices were produced. The push-out test was performed in a universal testing machine at a crosshead speed of 0.5 mm/minute and the values (MPa) were analyzed by Kolmogorov-Smirnov and Levene's tests and by two-way ANOVA and Tukey's post hoc test at a significance level of 5%.
  
  
  RESULTS
  Fiber posts cemented using Luting & Lining Cement, Fuji II LC Improved, and Ketac Cem presented the highest bond strength to root dentin, followed by RelyX Luting. Ionoseal presented the lowest bond strength values (P>0.05). The post level did not influence the bond strength of fiber posts to root dentin (P=0.148). The major cause of failure was cohesive at the cement for all GICs and RMGICs.
  
  
  CONCLUSIONS
  Except for Ionoseal, all cements provided satisfactory bond strength values.
authors.affiliation: University of Southern Santa Catarina, Tubarão, SC, Brazil.
authors.forename: Jefferson Ricardo
authors.initials: JR
authors.lastname: Pereira
authors.affiliation: Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Ricardo Abreu da
authors.initials: RA
authors.lastname: Rosa
authors.affiliation: Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Marcus Vinícius Reis
authors.initials: MV
authors.lastname: Só
authors.affiliation: University of Southern Santa Catarina, Tubarão, SC, Brazil.
authors.forename: Daniele
authors.initials: D
authors.lastname: Afonso
authors.affiliation: Department of Endodontics, School of Dentistry, Univ. Estadual Paulista, Araraquara, SP, Brazil.
authors.forename: Milton Carlos
authors.initials: MC
authors.lastname: Kuga
authors.affiliation: Department of Pediatric Dentistry, Orthodontics and Community Health, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Heitor Marques
authors.initials: HM
authors.lastname: Honório
authors.affiliation: Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Accácio Lins do
authors.initials: AL
authors.lastname: Valle
authors.affiliation: Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors.forename: Hugo Alberto
authors.initials: HA
authors.lastname: Vidotti
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods; D003804:Dentin / Q000187:drug effects*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D011076:Polycarboxylate Cement / Q000737:chemistry; D011176:Post and Core Technique; D011897:Random Allocation; D015203:Reproducibility of Results; D019279:Resin Cements / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry; D013718:Tensile Strength; D014092:Tooth Root / Q000187:drug effects*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; C093696:Ionoseal; D011076:Polycarboxylate Cement; D019279:Resin Cements; D012117:Resins, Synthetic; C084550:Vitremer; D008277:Magnesium Oxide; C040235:Ketac-cem; D015034:Zinc Oxide