Compared study of cyclic fatigue behaviors in two kinds of dental ceramic layers structures / 华西口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To compare the difference in strength degradation and morphology damage of two dental ceramic materials after Hertzian contact cyclic fatigue.</p><p><b>METHODS</b>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.</p><p><b>RESULTS</b>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.</p><p><b>CONCLUSION</b>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.</p>