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http://dx.doi.org/10.14347/kadt.2018.40.1.27

Processability study of dental zirconia block using scratch test  

Kim, Yung-Hoon (Department of Dental Laboratory Technology, Wonkwang Health Science University)
Publication Information
Journal of Technologic Dentistry / v.40, no.1, 2018 , pp. 27-32 More about this Journal
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 $1100^{\circ}C$. Methods: Partially sintered zirconia samples were prepared $40{\times}30{\times}10mm$ 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 mm/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 Hs.
Keywords
CAD/CAM; Zirconia; Machinability; Scratch hardness; Mechanical property;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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