Influence of surface and heat treatments on the flexural strength of a glass-infiltrated alumina/zirconia-reinforced dental ceramic
DOI: 10.1016/j.dental.2004.07.010
Title: Influence of surface and heat treatments on the flexural strength of a glass-infiltrated alumina/zirconia-reinforced dental ceramic
Journal Title: Dental Materials
Volume: 21
Issue: 5
Publication Date: May 2005
Start Page: 454
End Page: 463
Published online: online 16 November 2004
ISSN: 0109-5641
Author: Massimiliano Guazzato, Mohammad Albakry, Linda Quach, Michael V. Swain
Affiliations:
  • Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, United Dental Hospital, 2 Chalmers Street, Surry Hills, NSW 2010, Australia
  • Accepted: 13 July 2004
    Received: 14 August 2003
    Revised: 8 May 2004
    Keywords: Dental ceramics; Strength; Surface treatment; Heat treatment; Alumina; Glass; Zirconia
    Result: A thin layer of glass was present on the surface of the specimens after heat treatment and contributed to an improvement of the flexural strength. Surface treatment (not followed by heat treatment) generated phase transformation which, however, was not sufficient to avoid strength degradation caused by the flaws introduced with the surface treatments. Sandblasting caused the most marked strength degradation. Polishing alone increased the reliability, but did not improve the strength. The orientation of grinding in respect of the direction of the tensile stresses did not influence the ultimate tensile strength.SignificanceThe present study suggests that any surface treatment performed on In-Ceram Zirconia should always be followed by heat treatment to avoid strength degradation.
    Tel: +61 2 9351 1814
    Fax: +61 2 9351 1815
    Email: mgua2483@mail.usyd.edu.au

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