title: Influence of surface treatment on bond strength between a heat-activated and a light-activated resin composite.
abstract: The shear bond strength of two light-activated resin composite materials to a preformed heat-polymerized resin material was measured. The substrate was a urethane dimethacrylate material designed for use as a direct bonded pontic. In the first phase of the study, the shear bond strength between the substrate and a urethane-based resin composite and seven surface treatments was evaluated. In the second phase, a Bis-GMA resin composite and three surface treatments were studied. The study showed that a bonding agent was essential for the achievement of an adequate bond strength between the light-activated and heat-polymerized resin. However, there was a significant difference in bond strength depending on the type of light-activated resin composite and bond agent used. A Bis-GMA-based light-activated composite, together with its bond system (22.82 MPa), provided higher bond strength than a urethane-based resin composite and its bonding system (14.45 MPa). There was a direct relationship between cohesive failure and bond strength; as bond strength increased, the number of cohesive failures increased as well.
authors.affiliation: Dental Materials Laboratory, School of Dentistry, Indiana University, Indianapolis 46202, USA.
authors.forename: A
authors.initials: A
authors.lastname: Guzman
authors.forename: B K
authors.initials: BK
authors.lastname: Moore
mesh_terms: D000096:Acetone; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods; D017220:Dentin-Bonding Agents; D006358:Hot Temperature; D006858:Hydrofluoric Acid; D008027:Light; D008422:Materials Testing; D008689:Methacrylates; D020366:Methylmethacrylate; D008768:Methylmethacrylates; D011140:Polyurethanes; D019279:Resin Cements; D012821:Silanes; D013499:Surface Properties
chemical_list: D003188:Composite Resins; C096536:Dene Bridge composite resin; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; C088316:Optibond Dual Cure; D011140:Polyurethanes; C088833:Prisma TPH resin composite; D019279:Resin Cements; D012821:Silanes; C062652:Prisma Universal Bond; C065770:Herculite XR; C029824:urethane dimethacrylate luting resin; D000096:Acetone; D020366:Methylmethacrylate; D017438:Bisphenol A-Glycidyl Methacrylate; D006858:Hydrofluoric Acid