title: Bond strength of self-adhesive resin cements to different treated indirect composites.
abstract: OBJECTIVE
  The objective of this study was to determine microtensile bond strength (μTBS) to dentin of three self-adhesive and a total-etch resin cements used for luting different treated indirect composites.
  
  
  METHODS
  Composite overlays (Filtek Z250) were prepared. Their intaglio surfaces were ground with 600-grit SiC papers and randomly assigned to three different surface treatments: no treatment, silane application (RelyX Ceramic Primer), and silane agent followed by a bonding agent (Adper Scotchbond 1 XT). The composite overlays were luted to flat dentin surfaces of extracted human third molars using the following self-adhesive resin cements: RelyX Unicem, Maxcem Elite and G-Cem, and a total-etch resin cement, RelyX ARC. The bonded assemblies were stored in water (24 h, 37 °C) and subsequently prepared for μTBS testing. Beams of approximately 1 mm(2) were tested in tension at 1 mm/min in a universal tester (Instron 3345). Data were analyzed by two-way ANOVA and Student-Newman-Keuls tests (α = 0.05).
  
  
  RESULTS
  A significant influence of the resin cement used was detected. Composite surface treatment and the interaction between the resin cement applied and surface treatment did not affect μTBS.
  
  
  CONCLUSIONS
  Surface treatment of indirect resin composite did not improve the μTBS results of dentin/composite overlay complex. Self-adhesive resin cements tested obtained lower μTBS than the total-etch resin cement RelyX ARC. Specimens luted with Maxcem Elite exhibited the highest percentage of pretesting failures.
  
  
  CONCLUSIONS
  Surface treatment of indirect resin composite with silane or silane followed by a bonding agent did not affect bond strength to dentin.
authors.affiliation: Department of Stomatology, Health Sciences Faculty, Rey Juan Carlos University, Avda. Atenas s/n, Alcorcón, Madrid, 28922, Spain. victoria.fuentes@urjc.es
authors.forename: M Victoria
authors.initials: MV
authors.lastname: Fuentes
authors.forename: Laura
authors.initials: L
authors.lastname: Ceballos
authors.forename: Santiago
authors.initials: S
authors.lastname: González-López
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D019279:Resin Cements; D012821:Silanes; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D019246:Tooth Preparation
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; C528107:G-Cem resin cement; C515955:Maxcem; D011109:Polymethacrylic Acids; C483701:Rely X Unicem; C462240:RelyX ARC; D019279:Resin Cements; D012821:Silanes; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C041330:Scotchbond