| 지르코니아/알루미나 복합체의 In-vitro Hertzian 피로거동 |
| 이득용, 박일석1, 김대준2, 이세종3 |
대림대학 재료정보학과
1연세대학교 세라믹공학과
2세종대학교 신소재공학과
3경성대학교 신소재공학과 |
| In-vitro Hertzian Fatigue Behavior of Zirconia/Alumina Composites |
| Deuk-Yong Lee, Il-Seok Park1, Dae-Joon Kim2, Se-Jong Lee3 |
Department of Materials Engineering, Daelim College of Technology
1Department of Ceramic Engineering, Yonsei University
2Department of Advanced Materials Engineering, Sejong University
3Department of Advanced Materials Engineering, Kyungsung University |
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| ABSTRACT |
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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. |
| Key words:
Dental implant abutment, In-vitro, Zirconia/Alumina composites, Hertzian contact fatigue, Artificial saliva |
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