Alumina additions may improve the damage tolerance of soft machined zirconia-based ceramics.

Marit Oilo, Helene M Tvinnereim, Nils Roar Gjerdet

Journal: The International journal of prosthodontics 2011;24(2):172-4

PMID: 21479287

Abstract

The aim of this study was to evaluate the damage tolerance of different zirconia-based materials. Bars of one hard machined and one soft machined dental zirconia and an experimental 95% zirconia 5% alumina ceramic were subjected to 100,000 stress cycles (n = 10), indented to provoke cracks on the tensile stress side (n = 10), and left untreated as controls (n = 10). The experimental material demonstrated a higher relative damage tolerance, with a 40% reduction compared to 68% for the hard machined zirconia and 84% for the soft machined zirconia.

Address: Department of Clinical Dentistry, University of Bergen, Norway. [email protected]

MeSH Terms: Aluminum Oxide, Dental Polishing, Dental Porcelain, Dental Stress Analysis, Elastic Modulus, Hardness, Humans, Materials Testing, Pliability, Stress, Mechanical, Surface Properties, Temperature, Water, Yttrium, Zirconium