HfO2와 CeO2가 첨가된 3Y-TZP 치과용 블록의 제조 및 특성 평가
Preparation and characteristics of HfO2 and CeO2 doped 3Y-TZP block for dental ceramic block
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초록
CAD/CAM 가공이 가능한 치과용 3Y-TZP블록을 제조하였다. 블록 제조를 위하여 3Y-TZP분말에 HfO2와 CeO2 분말을 첨가하여 800~1100℃에서 열처리 한 후 1450℃에서 소결하였으며, 이때 HfO2와 CeO2 분말의 첨가량 및 열처리 조 건에 따른 블록의 기계적 특성 및 화학적 특성을 조사하였다. EDS mapping 이미지를 통하여 HfO2와 CeO2 분말이 3Y-TZP 에 비교적 분산이 잘되어 있음을 확인하였다. 본 실험에서는 3 wt% HfO2가 첨가된 블록이 가장 높은 굽힘 강도(1 GPa)를 나타내었으며, 3 wt% CeO2가 첨가된 블록은 수열분위기하에서의 t-ZrO2의 안정성을 향상 시키는 것으로 확인되었다.
Abstract
3Y-TZP block doped with HfO2 and CeO2 for dental ceramic block to the proliferation of CAD/CAM systems was prepared by heating at 800~1100℃ and then sintering at 1450℃. The influences of heating temperature and addition of HfO2 and CeO2 on the mechanical and chemical properties of 3Y-TZP block were investigated. Using the EDS mapping images, HfO2 and CeO2 was well dispersed in the 3Y-TZP matrix. 3 wt% HfO2 doped block showed the optimum biaxial strength (1 GPa), while 3 wt% CeO2 doped block enhanced the stability of t-ZrO2 under hydrothermal atmosphere.
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