title: The effect of two initiator/stabilizer concentrations in a metal primer on bond strengths of a composite to a base metal alloy.
abstract: This study examined the effect of three additives, amine, peroxide and stabilizer, in two concentrations in a metal primer on the adhesion between a cast metal alloy and a resin composite using a 23 factorial statistical design. The additives, benzoylperoxide (BPO) used at 1% or 2% w/w and N,N-dimethyl-p-toluidine (DMPT) at 0.5% or 1.8% w/w are polymerization initiators. The third additive, butylated hydroxytoluene (BHT) at 0.01% or 0.03% w/w, is used as a stabilizer. BPO and BHT were dissolved in an acetone solution containing 20% of the adhesive resin pyromellitic glyceroldimethacrylate (PMGDM). DMPT was in a separate acetone solution. Equal portions of each solution were mixed and applied to a sandpaper-abraded, air-blasted nickel-chrome alloy. Bonding resin and composite were applied over the primer and stored overnight in water. Bond strengths were determined by shearing the composite from the metal at a cross head speed of 0.5 mm/min. Increasing the concentration of BPO caused a statistically significant increase in bond strength. A 3-way analysis of variance (ANOVA) at p<0.05 showed that, of the interactions, only the one between DMPT and BPO was significant, with lower concentrations of DMPT being less sensitive to changes in BPO concentration.
authors.affiliation: American Dental Association Health Foundation-Paffenbarger Research Center, Gaithersburg, MD, USA.
authors.forename: N D
authors.initials: ND
authors.lastname: Richards
authors.forename: F
authors.initials: F
authors.lastname: Eichmiller
authors.forename: S V
authors.initials: SV
authors.lastname: Dickens
authors.forename: F V
authors.initials: FV
authors.lastname: Simoni
mesh_terms: D000704:Analysis of Variance; D001565:Benzoates / Q000737:chemistry; D001585:Benzoyl Peroxide / Q000737:chemistry; D002084:Butylated Hydroxytoluene / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements; D014052:Toluidines / Q000737:chemistry
chemical_list: D001565:Benzoates; D002858:Chromium Alloys; D003188:Composite Resins; D008689:Methacrylates; C090343:Mirage Dual Cure; D019279:Resin Cements; D014052:Toluidines; C080129:pyromellitic dianhydride glycerol dimethacrylate adduct; D002084:Butylated Hydroxytoluene; C036884:Rexillium III; C015835:dimethyl-4-toluidine; D001585:Benzoyl Peroxide