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http://dx.doi.org/10.4191/KCERS.2004.41.1.069

In-vitro Hertzian Fatigue Behavior of Zirconia/Alumina Composites  

Lee, Deuk-Yong (Department of Materials Engineering, Daelim College of Technology)
Park, Il-Seok (Department of Ceramic Engineering, Yonsei University)
Kim, Dae-Joon (Department of Advanced Materials Engineering, Sejong University)
Lee, Se-Jong (Department of Advanced Materials Engineering, Kyungsung University)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.1, 2004 , pp. 69-75 More about this Journal
Abstract
The degree of the indentation damage and strength degradation for 3Y-TZP ceramics and (Y,Nb)-TZP/$Al_2O_3$ dental implant composites was investigated under the Hertzian cyclic fatigue. Fatigue tests were conducted at contact loads of 500 to 3000 N and up to $10^6$ cycles in exact in vitro environments. At 500 N, no strength degradation and crack generation was observed up to $5{\times}10^5$ contact cycles. Fatigue properties of 3Y-TZP ceramics was superior to (Y,Nb)-TZP/ㅍ composites due to stress relief caused by the phase transformation from tettagonal to monoclinic phase. As contact load increased, the drastic reduction in strength was found when the damage transition from ring to radial crack occurred. The extent of strength degradation was more pronounced in vitro environments probably due to chemical corrosion of artificial saliva through cracks introduced during large numbers of contacts.
Keywords
Dental implant abutment; In-vitro; Zirconia/Alumina composites; Hertzian contact fatigue; Artificial saliva;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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