title: Bonding of hybrid composite resin to the surface of gold-alloy used in porcelain-fused-to-metal restorations.
abstract: The aim of this study was to determine the bond strength of hybrid composite resin to the surface of a gold alloy used in porcelain-fused-to-metal restorations. The surface of the gold alloy was either ground with a sintered diamond burr, sandblasted with Al2O4 or ground with a silicon-carbide stone. The composite resin was bonded to the surface of the gold alloy with or without a commercial silane primer. Bond strength was tested with a three-point loading test, and the elemental composition of the surface of the gold alloy after various mechanical treatments was analysed by SEM/EDS method. Replicas of the fracture surface of the test specimens were examined by SEM to determine whether or not composite resin particles left on the surface had adhered after the loading test. The results showed that mechanical treatment of the surface of the gold alloy affects the bond strength of the composite resin (P < 0.001) but that silane treatment of the surface did not affect the bond strength (P = 0.217). SEM/EDS analysis showed evenly distributed aluminium on the surface of sandblasted gold alloy and silicon on the surface that had been ground with the silicon-carbide stone. This study suggests that sandblasting of the gold alloy surface considerably enhances the strength of its bond to hybrid composite resin.
authors.affiliation: Department of Prosthetic Dentistry, Institute of Dentistry, University of Turku, Finland.
authors.forename: P K
authors.initials: PK
authors.lastname: Vallittu
mesh_terms: D000134:Acid Etching, Dental; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003775:Dental Polishing; D003776:Dental Porcelain; D003793:Dental Restoration, Permanent / Q000379:methods* / Q000706:statistics & numerical data; D006047:Gold Alloys / Q000032:analysis; D006801:Humans; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D006047:Gold Alloys; D003776:Dental Porcelain