Glass-alumina Composites Prepared by Melt Infi1tration: III. In-vitro Fatigue Behavior

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doi:2003.40.7.662

J. Korean Ceram. Soc. > Volume 40(7); 2003 > Article

Journal of the Korean Ceramic Society 2003;40(7): 662.
doi: https://doi.org/10.4191/kcers.2003.40.7.662

용융침투법으로 제조한 유리-알루미나 복합체: III. In-vitro 피로거동

이득용, 이세종¹, 박일석², 장주웅³, 김병수³

대림대학 재료정보학과
¹경성대학교 재료공학과
²연세대학교 세라믹공학과
³(주) 우리동명 치과재료연구소

Glass-alumina Composites Prepared by Melt Infi1tration: III. In-vitro Fatigue Behavior

ABSTRACT

Hertzian cyclic fatigue properties of the alumina-glass dental ceramics were evaluated in exact in vitro environment at contact loads from 200 N to 1000 N and up to 10$^$6/ cycles to investigate the indentation damage and strength degradation. At 200 N, no strength degradation and crack generation was observed up to 10$^$6/ contact cycles. As load increased from 200 N to 1000 N, 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 reaction of artificial saliva with glass phase through radial cracks introduced during large numbers of contacts.

Key words: Dental crowns, In-vitro, Glass-alumina composites, Hertzian contact fatigue, Artificial saliva