Properties of Dental CAD/CAM Zirconia

Bae,  Tae-Sung

J Korean Dent Assoc > Volume 49(5); 2011 > Article

The Journal of The Korean Dental Association 2011;49(5):260-264.
Published online May 31, 2011.

CAD/CAM 지르코니아 재료의 특성

배태성

전북대학교 치의학전문대학원 치과생체재료학교실

Properties of Dental CAD/CAM Zirconia

Tae-Sung Bae

Department of Dental Biomaterials, School of Dentistry, Chonbuk National University

Abstract

Zirconia (ZrO_2) 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 fuzzy-sintered block is difficult in machining, so pre-sintered soft 3Y-TZP block is usually used to mill by computer aided machining.

Key Words: tetragonal zirconia polycrystals(TZP);stress-induced phase transformation;