title: Bond strength of composite to alloy treated with bonding systems.
abstract: OBJECTIVE
  The in-vitro bond strengths of a composite bonded to a nickel-chromium-beryllium alloy treated by eight bonding systems were measured after three storage conditions.
  
  
  METHODS
  Nickel-chromium-beryllium alloy samples were treated by eight commercial bonding systems including adhesive composite cements, all-purpose bonding agents, and silica-coating systems. A composite was bonded to the alloy samples. Sample groups were stored in water for 24 hours at 23 degrees C, or thermocycled, or stored for 6 months at 23 degrees C and then debonded in tension.
  
  
  RESULTS
  Bond strengths after 24 hours storage were: adhesive composite cements, 14.2 to 22.1 MPa; all-purpose bonding agents, 11.4 to 14.6 MPa; and silica-coating systems, 18.6 to 20.2 MPa. Bond strengths after thermocycling were: adhesive composite cements, 12.6 to 20.6 MPa; all-purpose bonding agents, 9.9 to 17.7 MPa; and silica-coating systems, 11.1 to 19.2 MPa. Bond strengths after 6 months were: adhesive composite cements, 12.0 to 13.1 MPa; all-purpose bonding agents, 8.7 to 14.1 MPa; and silica-coating systems, 14.8 to 18.4 MPa.
  
  
  CONCLUSIONS
  Only two bonding systems showed decreased bond strength after thermocycling, as compared with 24 hours' storage; whereas four bond systems showed decreased bond strength after 6 months' storage. Bond strengths measured after thermocycling were not predictive of those measured after 6 months' storage.
authors.affiliation: Department of Removable Prosthodontics, University of Texas Houston Health Science Center, Dental Branch.
authors.forename: J C
authors.initials: JC
authors.lastname: Chang
authors.forename: J M
authors.initials: JM
authors.lastname: Powers
authors.forename: D
authors.initials: D
authors.lastname: Hart
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D001896:Boron Compounds; D002858:Chromium Alloys; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D008422:Materials Testing; D008689:Methacrylates; D008768:Methylmethacrylates; D012821:Silanes; D013718:Tensile Strength
chemical_list: C074864:All-Bond system; D001896:Boron Compounds; D002858:Chromium Alloys; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; C076811:Rocatec; D012821:Silanes; C062652:Prisma Universal Bond; C074811:Tenure adhesive; D017438:Bisphenol A-Glycidyl Methacrylate; C049495:Super-bond