Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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The effect of short and long duration sintering method on microstructure and flexural strength of zirconia

단시간과 장시간의 소결방법에 따른 지르코니아의 굴곡 강도와 미세구조의 변화

  • 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)
  • 이하빈 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 이태희 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김지환 (고려대학교 대학원 보건과학과 치의기공전공)
  • Received : 2020.03.09
  • Accepted : 2020.06.18
  • Published : 2020.06.30
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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.

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References

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