Preparation and properties of dental zirconia ceramics

Xinjie Liang1), Yuexiu Qiu1), Shaoxiong Zhou1), Xiaoyang Hu2), Guangyan Yu2), and Xuliang Deng2) 1) China Iron and Steel Research Institute Group, Beijing 100081, China 2) School and Hospital of Stomatology, Peking University, Beijing 100081, China

摘 要：Y2O3-stabilized tetragonal zirconia polycrystalline （Y-TZP） ceramics with high-performance were prepared for dental ap-plication by use of the micro-emulsion and two-step sintering method. The crystal phase, morphology, and microstructure of the re-action products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron mi-croscopy （TEM）. XRD results show that the ceramics mainly consist of tetragonal zirconia. Physical and mechanical properties test results show that the bending strength, fracture toughness, and the density of full sintered Y-TZP ceramics are 1150 MPa, 5.53 MPa·m1/2, and 6.08 g/cm3, respectively, which suggest that the material is relatively suitable for dental restoration. The dental base crown machined with this material by CAD/CAM system exhibits a verisimilitude configuration and the material’s expansion coeffi-cient well matches that of the glaze. These results further indicate that the product can be used as a promising new ceramic material to fabricate dental base crowns and bridges.

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