title: Occlusal wear of a resin-modified glass ionomer cement following three surface treatments.
abstract: Unacceptable occlusal wear has been reported for resin-modified glass ionomer cements (RMGICs) placed in permanent molar teeth. Three different surface treatments of a RMGIC were evaluated over periods of up to 2 years for their effects on restoration wear behaviour: (a) sealing with a thin layer of low viscosity unfilled resin (sealed restoration), (b) sealing with a thicker layer of a lightly-filled pit and fissure sealant (sealant restoration), and (c) co-curing the RMGIC with a posterior resin composite (co-cured restoration). After 2 years the cumulative median (quartiles) wear was for (a) 100 (50-150) microns, (b) 25 (0-50) microns, and (c) 25 (25-38) microns. Although method (b) effectively reduced the surface wear of the RMGIC, this treatment required frequent re-sealing, involving 52% of the restorations. Sealing the surface of a RMGIC placed in permanent molars was not a satisfactory method for reducing occlusal wear. However, co-curing the RMGIC with a posterior resin composite reduced occlusal wear significantly (P < 0.0001), without the need for frequent reapplications of a pit and fissure sealant to the RMGIC.
authors.affiliation: Prince Philip Dental Hospital, 34 Hospital Rd., Hong Kong SAR, China.
authors.forename: C H
authors.initials: CH
authors.lastname: Wu
authors.forename: R J
authors.initials: RJ
authors.lastname: Smales
mesh_terms: D000293:Adolescent; D000328:Adult; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003731:Dental Caries / Q000628:therapy; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D005260:Female; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008963:Molar; D010895:Pit and Fissure Sealants / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013499:Surface Properties
chemical_list: D003188:Composite Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D010895:Pit and Fissure Sealants; D019279:Resin Cements; D012117:Resins, Synthetic; C420128:Spectrum composite resin; C113300:TPH hybrid; D017438:Bisphenol A-Glycidyl Methacrylate; C081713:Visio-Bond