title: Significant shear bond strength improvements of a resin-modified glass ionomer cement with a resin coating.
abstract: Previous evidence has suggested that resin-modified glass ionomer cements (RMGICs) may be sensitive to temperature and moisture changes for the first 24 hours after photopolymerization. To test the hypothesis that a resin coating placed over the surface of an RMGIC restoration would decrease the susceptibility to moisture and temperature conditions, 44 RMGIC samples were prepared in inverted-cone recesses drilled in epoxy resin plates. After abrasion of all samples with 800-grit silicon carbide paper to simulate a diamond bur finish on the surface, a coat of highly filled resin was applied to the experimental group (n = 22) and cured according to the manufacturer's instructions. The plates were thermocycled 500 times between 5°C and 55°C and then maintained at 37°C with 95% humidity. The thermocycled samples were bonded to a second epoxy resin plate filled with RMGIC and subjected to shear bond strength testing. The resin-coated group had a significantly greater mean shear bond strength than the control group (P < 0.05). The resin coating also appeared to affect the mode of failure by significantly increasing the number of mixed failures (P < 0.05). The results suggest that a resin coating protects RMGIC from moisture- and temperature-induced damage and increases shear bond strength.
authors.forename: Michael T
authors.initials: MT
authors.lastname: Stallings
authors.forename: Daniel C
authors.initials: DC
authors.lastname: Stoeckel
authors.forename: Kenneth G
authors.initials: KG
authors.lastname: Rawson
authors.forename: Dan B
authors.initials: DB
authors.lastname: Welch
mesh_terms: D003188:Composite Resins / Q000627:therapeutic use*; D001840:Dental Bonding / Q000379:methods* / Q000592:standards; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000627:therapeutic use*; D006801:Humans; D033081:Shear Strength
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements
keywords: glass ionomer cement; resin coating; resin-modified glass ionomer cement