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KMID : 0362120200420020073
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Journal of Technologic Dentistry
2020 Volume.42 No. 2 p.73 ~ p.79
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The effect of short and long duration sintering method on microstructure and flexural strength of zirconia
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Lee Ha-Bin
Lee Tae-Hee
Kim Ji-Hwan
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Abstract
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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.
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KEYWORD
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3-point bending test, Flexural strength, Microstructure, SIC Furnace, Sintering schedule, Zirconia
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