title: Adhesive composite resins for artificial teeth: a laboratory investigation of bond strength to a cobalt-chromium alloy.
abstract: Adhesive resin systems are reported to improve the bond strength between resins and cast cobalt-chromium alloy. This investigation compares the behaviour of three resin systems. Cylinders and beams of cobalt-chromium, with 0.6-mm-diameter retention beads regularly cast onto the bonding surfaces, were air-abraded and ultrasonically cleaned. Resin veneers 4 mm deep on the cylinders and 2 mm on the bars were polymerized by heat and pressure or by light. Specimens were water-stored for 7 or 90 days, including thermocycling between 4, 37 and 60 degrees C, before testing in a Universal Testing Machine to examine the shear bond strength or the effect of the bonded resin spine on the flexural strength of the beams using a three-point bend test. Specimens were examined with an optical microscope to attempt to determine the nature of the failures that occurred. The investigation showed that, overall, the heat- and pressure-cured urethane dimethacrylate resin with and adhesive based upon methacrylic acid performed significantly less well than a conventional acrylic resin, or a hybrid composite resin with and adhesive monomer.
authors.affiliation: Department of Prosthetic Dentistry, Eastman Dental Institute for Oral Health Care Sciences, London, UK.
authors.forename: N A
authors.initials: NA
authors.lastname: Orchard
authors.forename: J A
authors.initials: JA
authors.lastname: Howlett
authors.forename: E H
authors.initials: EH
authors.lastname: Davies
authors.forename: G J
authors.initials: GJ
authors.lastname: Pearson
mesh_terms: D002857:Chromium; D003035:Cobalt; D003722:Dental Alloys / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D013718:Tensile Strength; D014093:Tooth, Artificial
chemical_list: D003722:Dental Alloys; D003738:Dental Cements; D002857:Chromium; D003035:Cobalt