Luo X, Zhao Y, Tian J
College of Stomatology, West China University of Medical Science, Chengdu 610041.
Zhonghua Kou Qiang Yi Xue Za Zhi. 1999 Jul;34(4):202-4.
It is a new way to fabricate all ceramic crowns by combining dental CAD/CAM with glass infiltration technology.
A partially alumina sintered block made of a high purity, fine alumina powder was shaped by isostastic pressure and sintered at 1,400 degrees C. Its mechanical properties were tested and microstructure was observed by SEM.
The Vicker's hardness, three-point bending strength, fracture toughness of partially sintered alumina block were 1.65 MPa, 210 MPa, 1.90 MPam1/2 respectively. Micrographs of SEM indicated that partially sintered alumina contained the structure of continuous three-dimensional open pores through the neck growth and surface diffusion of the interparticles.
The partially sintered alumina block that developed in this way may be used to mill for CAD/CAM and fabricate the shrinkage-free all ceramic crown.
将牙科CAD/CAM与玻璃渗透技术相结合是制造全瓷冠的一种新方法。
由高纯度细氧化铝粉末制成的部分烧结氧化铝块通过等静压成型，并在1400℃下烧结。测试其力学性能，并通过扫描电子显微镜观察微观结构。
部分烧结氧化铝块的维氏硬度、三点弯曲强度、断裂韧性分别为1.65MPa、210MPa、1.90MPam1/2。扫描电子显微镜照片表明，部分烧结氧化铝通过颗粒间的颈部生长和表面扩散含有连续三维开孔结构。
以这种方式开发的部分烧结氧化铝块可用于CAD/CAM研磨并制造无收缩全瓷冠。
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