Dental Materials
Volume 23, Issue 2 , Pages 177-185, February 2007

Cyclic fatigue in water of veneer–framework composites for all-ceramic dental bridges

  • André R. Studart

      Affiliations

    • Department of Materials, ETH-Zürich, Zurich, Switzerland
    • Corresponding Author InformationCorrespondence to: Department of Materials, Nonmetallic Inorganic Materials, Wolfgang–Pauli-Strasse 10, ETH Hönggerberg, HCI G 539, 8093 Zürich, Switzerland. Tel.: +41 44 632 37 18; fax: +41 44 632 11 32.
    • ,
  • Frank Filser

      Affiliations

    • Department of Materials, ETH-Zürich, Zurich, Switzerland
    • ,
  • Peter Kocher

      Affiliations

    • Department of Materials, ETH-Zürich, Zurich, Switzerland
    • ,
  • Heinz Lüthy

      Affiliations

    • Dental School, University of Basel, Basel, Switzerland
    • ,
  • Ludwig J. Gauckler

      Affiliations

    • Department of Materials, ETH-Zürich, Zurich, Switzerland

Received 3 August 2005; accepted 9 January 2006.

Abstract 

Objectives

Ceramic materials applied in dentistry may exhibit significant subcritical crack growth due to the severe cyclic loading in the aqueous environment encountered in the mouth during mastication. The authors report on the subcritical crack growth behavior of three dental restoration systems (Empress 2/IPS Eris, TZP/Cercon S and Inceram-Zirconia/Vita VM7) under cyclic loading in water, in order to establish guidelines for the use and design of long-lifetime all-ceramic posterior bridges.

Methods

Inert strength and lifetime tests under cyclic loading in an aqueous environment were performed in a mechanical bending apparatus and evaluated with Weibull statistics.

Results

Subcritical crack growth occurred predominantly in the outer veneer layer of the veneer–framework composites. The apatite-based veneer (IPS Eris) was more susceptible to subcritical crack propagation compared to the feldspathic glass veneers (Cercon S and Vita VM7).

Significance

Dental restoration systems containing apatite-based veneers and weak frameworks (Empress 2/IPS Eris) are not recommended for the fabrication of all-ceramic bridges in the molar region. Conversely, veneer–framework systems consisting of feldspathic glass veneers and tough zirconia-based frameworks (TZP/Cercon S and Inceram-Zirconia/Vita VM7) may exhibit lifetimes longer than 20 years if the bridge connector is properly designed.

Keywords: Dental bridge, Fixed partial denture, Ceramics, Zirconia, Alumina, Porcelain, Cyclic fatigue, Subcritical crack growth, Lifetime

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PII: S0109-5641(06)00012-1

doi:10.1016/j.dental.2006.01.011

Dental Materials
Volume 23, Issue 2 , Pages 177-185, February 2007

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