Two-Step Sintering of Partially Stabilized Zirconia for Applications in Ceramic Crowns
1
School of Materials Science and Engineering, Chonnam National University, Gwangju 61186, Korea
2
Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea
*
Authors to whom correspondence should be addressed.
†
Current affiliation: School of Mechanical Engineering, Chonnam National University.
Materials 2020, 13(8), 1857; https://doi.org/10.3390/ma13081857
Received: 5 March 2020
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Revised: 9 April 2020
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Accepted: 13 April 2020
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Published: 15 April 2020
(This article belongs to the Special Issue Sintering and Grain Growth Behavior of Ceramics)
Partially-stabilized zirconia is used in ceramic crowns due to its excellent mechanical properties and bio-inertness but does not match the natural color and translucency of tooth enamel. To reduce scattering of light and improve translucency, the grain size of zirconia ceramics should be less than the wavelength of visible light (0.4–0.7 μm), and porosity should be eliminated. The aim of the present work was to study the effect of two-step sintering of a commercial powder (Zpex Smile, Tosoh Corp., Tokyo, Japan) on the grain size and translucency of zirconia for use in ceramic crowns. Samples were sintered at a first step temperature (T1) of 1300, 1375 and 1400 °C for 5 min, followed by a decrease to the second step temperature (T2) and holding at T2 for 5–20 h. Samples were also conventionally sintered at 1450 °C for 2 h for comparison. Two-step sintered samples with an almost equal density, smaller grain size and narrower grain size distribution compared to conventionally sintered samples could be sintered. However, the translucency of two-step sintered samples had lower values compared to conventionally sintered samples. This is due to the slightly higher porosity in the two-step sintered samples. Density and translucency of both conventionally and two-step sintered samples could be increased further by using a ball milled powder.
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Keywords:
zirconia; two-step sintering; microstructure; translucency
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MDPI and ACS Style
Darmawan, B.A.; Fisher, J.G.; Trung, D.T.; Sakthiabirami, K.; Park, S.-W. Two-Step Sintering of Partially Stabilized Zirconia for Applications in Ceramic Crowns. Materials 2020, 13, 1857. https://doi.org/10.3390/ma13081857
AMA Style
Darmawan BA, Fisher JG, Trung DT, Sakthiabirami K, Park S-W. Two-Step Sintering of Partially Stabilized Zirconia for Applications in Ceramic Crowns. Materials. 2020; 13(8):1857. https://doi.org/10.3390/ma13081857
Chicago/Turabian StyleDarmawan, Bobby A., John G. Fisher, Doan T. Trung, Kumaresan Sakthiabirami, and Sang-Won Park. 2020. "Two-Step Sintering of Partially Stabilized Zirconia for Applications in Ceramic Crowns" Materials 13, no. 8: 1857. https://doi.org/10.3390/ma13081857
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