Korean J Dent Mater.  2018 Sep;45(3):147-154. 10.14815/kjdm.2018.45.3.147.

Influence of the microwave sintering period on the 3 point flexural strength and shade of zirconia restoration

  • 1Student, Department of Dental Laboratory Technology, Shingu University. Seongnam, Korea.
  • 2Professor, Department of Dental Laboratory Technology, Shingu University, Seongnam, Korea.
  • 3Professor, Research Institute of Health Sciences, Korea University, Seoul, Korea.
  • 4Research professor, Department of Mechanical Robotics and Energy Engineering, Dongguk University, Seoul, Korea. bej1119@naver.com


In this study, we tried to confirm clinically applicable applicability by comparing the difference in 3 point flexural strength and shade of the prosthesis depending on microwave sintering time of dental CAD / CAM zirconia. 3 Point flexural strength specimens (n=30) and shade measurement specimens (n=28) were prepared and sintered at different sintering times. 3 point flexural strength and shade were measured and analyzed by independent t-test (α=0.05). Measurement result of 3 point flexural strength the average of short-term sintering (STS) was 245.47±29.89 MPa, the average of long-term sintering (LTS) was 284.27±31.56 MPa, and there was a statistically significant difference (p < 0.05). The shade measurement result ⊿E*(ab) showed the average STS of 1.51±0.48 and the LTS of 1.52±0.41, but there was no statistically significant difference (p>0.05). The 3 point flexural strength of the zirconia restorations fabricated by short time and long time was high in long time sintering. However, other conditions may be required for clinical applications. Since the shade test did not show any significant color difference according to sintering time, it is considered to be sufficient for clinical application.


Zirconia; Microwave sintering time; 3 point flexural strength; Shade

MeSH Terms

Prostheses and Implants
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