Microleakage of glass ionomer/composite resin restorations: a laboratory study. 1. The influence of glass ionomer cement.
Acid-etching of enamel margins, often combined with bevelling and use of a low viscosity resin, has resulted in improved sealing of composite restorations. When enamel is absent and margins involve dentine or cementum, microleakage is more often observed. The use of glass ionomer cement, as both a restorative material and as a base combined with a veneer of composite resin, has been advocated as a means of minimizing microleakage where margins are placed in dentine or cementum. Four restorative techniques incorporating glass ionomer cement were used, in vitro, to restore cervical cavities. After thermal cycling, dye penetration was scored along occlusal and gingival margins. In all instances the gingival margin exhibited a less reliable seal than the occlusal margin. The sandwich restorations produced a superior seal at both occlusal and gingival margins when compared with glass ionomer restorative cement.
Smith
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ED
Department of Operative Dentistry, University of Sydney.
Martin
F E
FE
D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003738:Dental Cements / Q000737:chemistry; D003739:Dental Cementum / Q000648:ultrastructure; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage; D003793:Dental Restoration, Permanent / Q000379:methods; D003804:Dentin / Q000648:ultrastructure; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008298:Maleates / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements; D013499:Surface Properties
D000180:Acrylic Resins; D000538:Aluminum Silicates; D004396:Coloring Agents; D003188:Composite Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; D008298:Maleates; D011109:Polymethacrylic Acids; D019279:Resin Cements; C061499:Ketac-Bond; C067790:Vitrabond; D017438:Bisphenol A-Glycidyl Methacrylate; C006903:carbopol 940; C039733:Chemfil; C040964:Ketac-Fil; C041330:Scotchbond