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KMID : 0362720110490050260
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Journal of the Korean Dental Association
2011 Volume.49 No. 5 p.260 ~ p.264
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Properties of Dental CAD/CAM Zirconia
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Bae Tae-Sung
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Abstract
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Zirconia (ZrO2) is a crystalline dioxide of zirconium. Dental zirconia blocks for CAD/CAM are usually fabricated with powders of tetragonal zirconia polycrystals (TZP) stabilized with 3mol% yttria. Because of its mechanical properties similar to those of metals and color similar to tooth, it is evaluated to attain the two purposes at a time, strength and aesthetic in prosthetic dentistry. The ability of transformation of Y-TZP from tetragonal to monoclinic helps to prevent crack propagation and contributes the increase of strength and fracture toughness. Two different types of blocks, soft and hard, are used to prepare the zirconia frameworks. The fully-sintered block is difficult in machining, so pre-sintered soft 3Y-TZP block is usually used to mill by computer aided machining.
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KEYWORD
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tetragonal zirconia polycrystals(TZP), stress-induced phase transformation
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