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[Development of partially sintered alumina block for dental CAD/CAM and mechanical properties testing]
1College of Stomatology, West China University of Medical Science, Chengdu 610041.
Objective:
It is a new way to fabricate all ceramic crowns by combining dental CAD/CAM with glass infiltration technology.
Methods:
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.
Results:
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.
Conclusion:
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.