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  • Title: Fracture resistance of amalgam/glass-polyalkenoate open sandwich Class II restorations: an in vitro study.
    Author: Roberts HW, Vandewalle KS, Charlton DG, Berzins DW.
    Journal: J Dent; 2008 Nov; 36(11):873-7. PubMed ID: 18692947.
    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. MATERIALS AND 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. CONCLUSION: Root-dentin replacement with the tested glass-polyalkenoate materials did not affect the fracture strength of Class II amalgam restorations.
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