Acoustic Emission Signals from Gypsum-bonded Dental Casting Molds during Thermal Processing
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概要
- 論文の詳細を見る
To develop a suitable heating program for the investments which affect the casting accuracy/defects of prostheses, a probable microstructural change of the gypsum-bonded investments related to the transition of refractory particles during thermal processing was inspected by the measurement of acoustic emission (AE) signals. Cypsum-bonded cristobalite and quartz investment molds were used. AE measurements were carried out for the specimens in an electric furnace that was heated/cooled at a constant rate. For the heating process of the cristobalite investment, high AE activities were detected in the temperature range where the cristobalite was transformed. However, the AE signals detected were low for the second run of the heating and cooling processes. Even in the heating process, significant AE signals were not detected for the quartz investment. For cristobalite investment molds, micro-cracks are initiated and developed in relation to the transition of cristobalite particles in the mold. This leads to deterioration of the mechanical properties of the cristobalite investment at high temperatures (melt-pouring), and may affect the fitness of cast prostheses.
- 日本歯科理工学会の論文
著者
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ASAOKA Kenzo
Department of Biomaterials and Bioengineering, The University of Tokushima Graduate School of Oral S
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YOSHIDA Kenichi
Department of Life Sciences, School of Agriculture, Meiji University
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Kim Kyo-han.
Department Of Dental Meterials College Of Dentistry Kyungpook National University
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Asaoka Kenzo
Department Of Dental Engineering School Of Dentistry The University Of Tokushima
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Asaoka Kenzo
Department Of Biomaterials And Bioengineering Institute Of Health Biosciences The University Of Toku
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Yoshida K
Graduate School Of Business Science University Of Tsukuba
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Yoshida Kenichi
Department Of Legal Medicine Graduate School Of Medicine University Of Tokyo
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Yoshida Kenichi
Department Of Forensic Medicine Graduate School Of Medicine University Of Tokyo
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Asaoka Kenzo
Department Of Biomaterials & Bioengineering Institute Of Health Biosciences The University Of Tokushima Graduate School
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ASAOKA Kenzo
Department of Dental Engineering, School of Dentistry, The University of Tokushima
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