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http://dx.doi.org/10.14347/kadt.2020.42.2.73

The effect of short and long duration sintering method on microstructure and flexural strength of zirconia  

Lee, Ha-Bin (Department of Dental Laboratory Science & Engineering, College of Health Science, Korea University)
Lee, Tae-Hee (Department of Dental Laboratory Science & Engineering, College of Health Science, Korea University)
Kim, Ji-Hwan (Department of Dental Laboratory Science & Engineering, College of Health Science, Korea University)
Publication Information
Journal of Technologic Dentistry / v.42, no.2, 2020 , pp. 73-79 More about this Journal
Abstract
Purpose: The aim of this study was to investigate the influence of short and long duration sintering on microstructure and flexural strength of zirconia. Methods: To conduct three-point bending test, Zirconia specimens are milled according to ISO 6872 guidelines(N=18, n=9 per group). Two specimens group(n=8) is sintered for 10 hours(Standard schedule) and 3 hours(Speed schedule) at the peak temperature of 1550℃ with silicon carbide sintering furnace. Flexural strength of specimens are measured by instron. After coating each specimen(n=1), microstructure of specimens is observed using Scanning Electron Microscope(SEM). T-test was utilized to statistically assess the data. Results: The mean and standard deviation value of the flexural strength for standard schedule group are 578.15±57.48Mpa, that of speed schedule are 465.9±62.34Mpa. T-test showed significant differences in flexural strength between two zirconia specimen group which applied standard schedule and speed schedule respectively(p<0.05). Conclusion: The result of this study showed that the increase in sintering time led to increased grain size, and also to a positive effect on the flexural strength.
Keywords
3-point bending test; Flexural strength; Microstructure; SIC Furnace; Sintering schedule; Zirconia;
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Times Cited By KSCI : 2  (Citation Analysis)
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