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Zirconia; leucite; metal–ceramic bond; mechanical properties.

The dental zirconia–leucite composites were synthesized by high temperature solid-state method using potash feldspar, potassium carbonate and zirconia as raw materials. The mechanical properties and the coefficient of thermal expansion (CTE) of the prepared zirconia–leucite composites were tested. The results show that the bending strength, the fracture toughness and the metal–ceramic bonding strength of the prepared samples are about 110 MPa, 3.5 MPa/m^1/2 and 45 MPa, respectively. The CTE was about 13.73×10$^{-6}\ ^\circ $C^-1 and close to that of Ni–Cr dental alloy (14.0×10$^{-6}\ ^\circ $C^-1). The results indicate that the introduction of zirconia is beneficial to the improvement in the mechanical properties and CTE adjustment of porcelain material. The clinical application of the zirconia–leucite composites with good metal–ceramic bonding strength in the dental restoration could be envisioned.

Ming Kang^{1 2} Xiaoming Liao¹ Guangfu Yin¹ Xun Sun³ Xing Yin⁴ Lu Xie⁴ Jun Liu²

1. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China
2. College of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
3. Department of Urology, People’s Hospital of Jinghong, Jinghong 666100, China
4. West China College of Stomatology, Sichuan University, Chengdu 610041, China

Published

December 2010

Manuscript received

11 May 2009

Manuscript revised

11 July 2009