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KMID : 1035320170440020163
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Korean Society for Dental Materials
2017 Volume.44 No. 2 p.163 ~ p.169
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Effect of microwave sintering on flexural strength of dental zirconia
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Jeon Byung-Wook
Lee Gwang-Young
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Abstract
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The aim of this study is to confirm the flexural strength change of dental zirconia prepared by final sintering with conventional sintering and microwave sintering, we measured the three point bending strength and analyzed the change of crystal and microstructure related to it. The 3-point flexural strength of all specimens were measured with a universal testing machine, and analyzed by t-test. The X-ray diffraction analysis were performed to estimate the phase transformation and microstructural change was measured by field emission scanning electron microscope. The flexural strength was high in microwave sintering, but there was no significant difference (p>0.05). The crystal structure had a tetragonal structure in both microwave and conventional sintering. There was not enough time for grain growth during microwave sintering, and grain size was smaller than conventional sintering. Based on the present study, the microwave sintering of the dental zirconia reduces the working time and makes the microstructure more uniform by the small crystal grains, thereby increasing the strength.
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KEYWORD
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Dental zirconia, Flexural strength, Microstructure, Microwave sintering
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