스크래치 시험을 이용한 치과용 지르코니아 블록의 가공성 연구
Processability study of dental zirconia block using scratch test
김영훈,
소속 상세정보
김영훈 ( Kim Yung-Hoon ) - 원광보건대학교 치기공과
Abstract
Purpose: This study was performed to investigate processability of the dental zirconia block. Most of the CAD/CAM zirconia restorations utilize the partially sintered blocks, which are sintered at a temperature lower than 1100℃.
Methods: Partially sintered zirconia samples were prepared 40×30×10 ㎜ and surface treatment by #2000 sandpaper. Scratch hardness was determined by the procedure of ASTM G171-03 using a scratch hardness tester(KS TECH, Korea) equipped with a real time load detector to measure tangential force during scratching. The scratch rate was 30 ㎜/min.
Results: Scratch hardness(Hs) increases steeply with increase in the loads. The highest Hs was sampl 1.42 GPa and lowest was sample 0.42 GPa.
Conclusion : The machinability of partially sintered CAD/CAM zirconia blocks can be optivized by manipulation of
키워드
CAD/CAM; Zirconia; Machinability; Scratch hardness; Mechanical property
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