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Materials 2010, 3(5), 2975-2985; doi:10.3390/ma3052975

Long Term Fatigue Behavior of Zirconia Based Dental Ceramics

Dental Biomaterials Department, Faculty of Dentistry, Champolion Street, Alexandria University, Egypt
Received: 3 February 2010 / Revised: 3 April 2010 / Accepted: 12 April 2010 / Published: 28 April 2010
(This article belongs to the Special Issue Ceramics for Healthcare)
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This study evaluated the influence of cyclic loading on zirconia bar-shaped specimens after being subjected to three different surface treatments: particle abrasion with either 50 μm or 110 μm alumina and grinding with diamond points, while polished specimens served as a control. Statistical analysis revealed significant reduction (38-67%) in flexure strength (P < 0.001) after three million cycles of dynamic loading for all surface treatments. Scanning electron imaging revealed grain boundary thickening, grain pull-out, and micro-cracking as the main structural defects. The results suggest that various surface treatments of zirconia based dental ceramics may significantly influence their long term fatigue resistance in the oral environment.
Keywords: surface damage; surface roughness; fatigue; flexure strength surface damage; surface roughness; fatigue; flexure strength
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Aboushelib, M.N. Long Term Fatigue Behavior of Zirconia Based Dental Ceramics. Materials 2010, 3, 2975-2985.

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