[Compared study of cyclic fatigue behaviors in two kinds of dental ceramic layers structures].
OBJECTIVE
To compare the difference in strength degradation and morphology damage of two dental ceramic materials after Hertzian contact cyclic fatigue.


METHODS
Hertzian contact technique was used to investigate the response of Empress II glass ceramic and GI- II glass-infiltrated alumina ceramic to cyclic fatigue. Critical loads of specimens after different fatigue cycles were recorded.


RESULTS
For Empress II glass ceramic, critical load had significantly difference between specimens after 10(5) cycles loading. No significant difference of critical load was found in GI- II glass-infiltrated alumina ceramic after cycles loading.


CONCLUSIONS
GI- II glass-infiltrated alumina ceramic has better capability in resistance to cyclic loading. It may attribute to microstructure of material. Empress II glass ceramic shows a brittle damage model.
Su
Jian-Sheng
JS
Dept. of Prosthodontics, Oral Hospital of Tongdi University, Shanghai.
Guo
Ling-Yun
LY
Liu
Wei-cai
WC
D000537:Aluminum Oxide; D000538:Aluminum Silicates; D002516:Ceramics; D003776:Dental Porcelain; D005898:Glass; D006801:Humans; D008422:Materials Testing
D000538:Aluminum Silicates; C075815:IPS-Empress ceramic; D003776:Dental Porcelain; C023506:Glass ceramics; D000537:Aluminum Oxide