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    Int J Prosthodont. 2010 Jul-Aug;23(4):350-2.

    The effect of framework design on fracture resistance of metal-ceramic implant-supported single crowns.

    de Oliveira JL, Martins LM, Sanada J, de Oliveira PC, do Valle AL.

    Source

    Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Brazil. zezogoes@uol.com.br

    Abstract

    This study evaluated the effect of framework design on the fracture resistance of metal-ceramic implant-supported crowns. Screw-retained molar crowns with a screw access hole composed of metal or porcelain were compared to a cement-retained crown (control). For each group (n = 10), five crowns were subjected to dynamic loading (1,200,000 x 100 N x 2 Hz at 37 degrees C). Afterward, all specimens were loaded to failure using a universal testing machine. Significant differences could be established between the cement- and screw-retained groups (P = or < .05), but no difference was found between the screw-retained groups and the specimens subjected to dynamic loading. Occlusal discontinuity of screw-retained crowns affects their resistance, and the metallic support on the screw access hole did not reinforce the crowns.

    PMID:
    20617225
    [PubMed - indexed for MEDLINE]

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