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Volume 24 , Issue 2
March/April 2011

Pages 172–174


Alumina Additions May Improve the Damage Tolerance of Soft Machined Zirconia-Based Ceramics

Marit Řilo, DDS, PhD/Helene M. Tvinnereim, DDS, PhD/Nils Roar Gjerdet, DDS, PhD


PMID: 21479287

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. Int J Prosthodont 2011;24:172–174.


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