title: Microleakage of Class V compomer and light-cured glass ionomer restorations.
abstract: BACKGROUND
  Resin-modified (light-cured) glass ionomer and polyacid-modified composite resin (compomer) restorations are popular choices for the restoration of root caries and cervical abrasion/erosion lesions, but clinical studies are relatively few and have been published primarily as abstracts.
  
  
  OBJECTIVE
  In the absence of adequate clinical data, the marginal integrity of restorations of the above two types of material was compared in vitro. The microleakage of restorations of two light-cured glass ionomer restorative materials and of one compomer material was evaluated.
  
  
  METHODS
  Restorations of the three materials were placed in facial and lingual Class V cavity preparations in bovine incisors. All preparations were centered on the cementoenamel junction and were prepared with 45-degree enamel bevels. After thermal cycling, teeth were immersed in methylene blue dye, then sections of the restorations (n = 16) were visually evaluated.
  
  
  RESULTS
  Dye penetration was observed at approximately 20% of restoration margins for all three materials, with the greatest incidence of severe leakage in the compomer restorations.
  
  
  CONCLUSIONS
  No significant difference in microleakage among the three materials (ANOVA; p > 0.05) was found.
authors.affiliation: Department of General Dentistry, College of Dentistry, University of Tennessee-Memphis, USA.
authors.forename: W W
authors.initials: WW
authors.lastname: Brackett
authors.forename: T D
authors.initials: TD
authors.lastname: Gunnin
authors.forename: R O
authors.initials: RO
authors.lastname: Gilpatrick
authors.forename: W D
authors.initials: WD
authors.lastname: Browning
mesh_terms: D000818:Animals; D002417:Cattle; D020770:Compomers; D003188:Composite Resins; D003763:Dental Leakage; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D005899:Glass Ionomer Cements; D008689:Methacrylates; D017640:Silicates
chemical_list: D020770:Compomers; D003188:Composite Resins; C088486:Dyract; D005899:Glass Ionomer Cements; D008689:Methacrylates; D017640:Silicates; C084550:Vitremer; C084541:Fuji glass-ionomer lining cement