title: Leakage patterns associated with glass-ionomer-based resin restorations.
abstract: This study compared microleakage patterns for glass-ionomer-cement-based resin systems with and without a separating agent placed between the glass ionomer and resin. Results indicated significant leakage (100%) at the dentin glass-ionomer interface for specimens without a separating agent. Those with a separating agent showed almost no leakage between the dentin and glass ionomer (10%) and some leakage at the resin/glass ionomer interface (40%). These results suggest that the forces of polymerization shrinkage are stronger than the chemical bond between glass-ionomer cement and dentin. This bond fails during resin polymerization, eliminating any supplementary retention gained through chemical adhesion to dentin and opening a pathway for microleakage.
authors.affiliation: State University of New York at Buffalo, School of Dental Medicine.
authors.forename: G
authors.initials: G
authors.lastname: Wieczkowski
authors.forename: R B
authors.initials: RB
authors.lastname: Joynt
authors.forename: E L
authors.initials: EL
authors.lastname: Davis
authors.forename: X Y
authors.initials: XY
authors.lastname: Yu
authors.forename: K
authors.initials: K
authors.lastname: Cleary
mesh_terms: D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008963:Molar; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; C074319:GC Lining Cement; C061499:Ketac-Bond