Influence of the microwave sintering period on the 3 point flexural strength and shade of zirconia restoration
10.14815/kjdm.2018.45.3.147
- Author:
Ji Hye KANG
1
;
Kyung Min YU
;
Ji Hyeon LEE
;
Da Yeon SONG
;
Jung Soo LEE
;
Ji Hawn KIM
;
Eun Jeong BAE
Author Information
1. Student, Department of Dental Laboratory Technology, Shingu University. Seongnam, Korea.
- Publication Type:Original Article
- Keywords:
Zirconia;
Microwave sintering time;
3 point flexural strength;
Shade
- MeSH:
Microwaves;
Prostheses and Implants
- From:
Korean Journal of Dental Materials
2018;45(3):147-154
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
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.
