title: Fracture resistance of amalgam/glass-polyalkenoate open sandwich Class II restorations: an in vitro study.
abstract: OBJECTIVE
  To investigate the effect of two glass-polyalkenoate restorative materials used as root-dentin replacements on the fracture strength of Class II amalgam restorations.
  
  
  METHODS
  Class II slot preparations extending 2mm apical to the cemento-enamel junction were made in 30 teeth and randomly assigned to three groups. Group 1 (Control): restored entirely with amalgam (Tytin, Sybron Kerr, Orange, CA, USA). Group 2: The root-dentin area was restored with a viscous conventional glass-polyalkenoate restorative material (Fuji IX GP, GC America, Alsip, IL, USA), and the remainder of the preparation restored with amalgam. Group 3: The root-dentin area was restored with a resin-modified glass-polyalkenoate restorative material (Fuji II LC, GC America) and the remainder restored with amalgam. The amalgam restorations were loaded in compression to failure and the data analyzed using one-way ANOVA (alpha=0.05).
  
  
  RESULTS
  No significant differences in fracture strength were found.
  
  
  CONCLUSIONS
  Root-dentin replacement with the tested glass-polyalkenoate materials did not affect the fracture strength of Class II amalgam restorations.
authors.affiliation: USAF Dental Evaluation and Consultation Service, Great Lakes, IL, USA.
authors.forename: Howard W
authors.initials: HW
authors.lastname: Roberts
authors.forename: Kraig S
authors.initials: KS
authors.lastname: Vandewalle
authors.forename: David G
authors.initials: DG
authors.lastname: Charlton
authors.forename: David W
authors.initials: DW
authors.lastname: Berzins
mesh_terms: D000704:Analysis of Variance; D003723:Dental Amalgam / Q000737:chemistry* / Q000627:therapeutic use; D003737:Dental Cavity Preparation / Q000379:methods; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D005899:Glass Ionomer Cements / Q000737:chemistry* / Q000627:therapeutic use; D006801:Humans; D008334:Mandible; D008422:Materials Testing; D008437:Maxilla; D008964:Molar, Third; D011897:Random Allocation; D017213:Root Caries / Q000628:therapy*; D013314:Stress, Mechanical; D019237:Tooth Cervix / Q000601:surgery
chemical_list: D005899:Glass Ionomer Cements; C110713:fuji IX; D003723:Dental Amalgam