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Comparative mechanical property characterization of 3 all-ceramic core materials
by Wen MY, Mueller HJ, Chai J, Wozniak WT.
American Dental Association Health Foundation, Paffenbarger Research Center, Gaithersburg, Maryland, USA.


The biaxial flexural strength and fracture toughness for 3 representative types of ceramic core materials (leucite-reinforced glass, a glass-infiltrated sintered alumina, and a high-purity, high-density alumina) were studied. The biaxial flexural strengths of the high-purity, high-density alumina and glass-infiltrated sintered alumina ceramic core types were significantly higher than that of the leucite-reinforced glass ceramic type. The glass-infiltrated sintered alumina was significantly higher in fracture toughness than the high-purity, high-density alumina type, which was significantly higher than the leucite-reinforced glass. The glass-infiltrated sintered alumina and the high-purity, high-density alumina types were significantly stronger and tougher than currently used core materials.

In-Ceram vs. Procera vs. Empress:
"The glass-infiltrated sintered alumina (In-Ceram) was significantly higher in fracture toughness than the high-purity, high-density alumina type (Procera),
which was significantly higher than the leucite-reinforced glass (Empress).�?