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KMID : 0362120180400010027
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Journal of Technologic Dentistry
2018 Volume.40 No. 1 p.27 ~ p.32
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Processability study of dental zirconia block using scratch test
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Kim Yung-Hoon
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Abstract
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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
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KEYWORD
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CAD/CAM, Zirconia, Machinability, Scratch hardness, Mechanical property
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