title: Microleakage of resin-modified glass ionomer cement restorations: an in vitro study.
abstract: Microleakage of two resin-modified glass ionomer cement (GIC) restorative materials was compared with that of two conventional GIC restorative materials. Forty-five noncarious extracted human molars were prepared with standardized Class V cavity outlines on the buccal and lingual surfaces. The occlusal margin was in enamel and the gingival margin was in dentin/cementum. All were restored according to the manufacturers' instructions. After thermocycling, 30 teeth were placed in 2% basic fuchsin dye for 24 h, sectioned and viewed with a stereomicroscope to assess microleakage. The other 15 teeth were sectioned, replicated and prepared for marginal gap evaluation using a SEM. Differences in microleakage scores between materials were compared using Kruskal-Wallis and Mann-Whitney U tests. One resin-modified GIC restorative material showed significantly less microleakage against enamel and dentin/cementum compared to the conventional GIC restorative (p < 0.01). Marginal gap formation for both resin-modified GIC restorations was limited to the axial wall of the restorations.
authors.affiliation: Department of Pediatric Dentistry, University of Texas Health Science Center, San Antonio.
authors.forename: K B
authors.initials: KB
authors.lastname: Hallett
authors.forename: F
authors.initials: F
authors.lastname: Garcia-Godoy
mesh_terms: D000704:Analysis of Variance; D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry; D003763:Dental Leakage; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008298:Maleates; D016555:Matched-Pair Analysis; D008855:Microscopy, Electron, Scanning; D012117:Resins, Synthetic; D018709:Statistics, Nonparametric
chemical_list: D003188:Composite Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008298:Maleates; C081144:Photac-Fil; D012117:Resins, Synthetic; C037885:Fuji-ionomer; C040964:Ketac-Fil