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KMID : 1035320160430020185
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Korean Society for Dental Materials
2016 Volume.43 No. 2 p.185 ~ p.192
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Influence of Sintering Holding Time on Flexural Strength of Dental CAD/CAM Zirconia
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Jeon Byung-Wook
Lee Gwang-Young
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Abstract
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This study investigated the influence of sintering holding time on flexural strength of dental CAD/CAM zirconia. Thirty specimens of dental CAD/CAM zirconia were sintered at 1,500℃ applying three holding times(0, 2 and 5 h). The 3-point flexural strength of all specimens were measured with a universal testing machine, and analyzed by one-way ANOVA. The microstructural change was measured by FE-SEM and X-ray diffraction analysis were performed to estimate the phase transformation. The highest flexural strength was observed in groups sintered holding time of 2 hours(GS2 group). The flexural strength of the all specimens were not significantly different(p＞0.05). The increase of sintering time, the grain size of zirconia will increase and result in a decrease of flexural strength. Based on the present study, it could be considered that the ideal sintering condition of 1,500℃ for 2 hours is recommended for the better strength.
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KEYWORD
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Dental CAD/CAM zirconia, Flexural strength, Grain growth, Holding time
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