Porosity of dental gypsum-bonded investments in setting and heating process

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著者

    • ASAOKA Kenzo
    • Department of Biomaterials & Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School
    • BAE Ji-Young
    • Department of Biomaterials & Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School
    • LEE Hae-Hyoung
    • Department of Biomateriats Science, School of Dentistry, Dankook University

抄録

The porosity of gypsum-bonded investments for set and heated compacts was measured and theoretically computed quantitatively, because porosity is an effective factor for determining the strength, setting/heating expansion, and permeability of compacts at casting. A helium gas pycnometer was used to measure the solid volume of fine powders, powder-water mixtures, and porous compacts. The compositions of the conventional cristobalite investment and rapid-heating type investment were estimated from the measured solid densities of the as-received powders and the set investments. The porosity and water content of the set investments were determined from the experimental data. Excess water content in the set investment was calculated in relation to the elapsed time from the start of mixing with water. The experimental porosities of the set and heated investments were about 40% for dry set >compacts and about 50% for fired compacts, which well agreed with the numerically computed estimations, respectively.

収録刊行物

  • Dental materials journal

    Dental materials journal 31(1), 120-124, 2012-01-01

    日本歯科理工学会

参考文献:  19件中 1-19件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10030128480
  • NII書誌ID(NCID)
    AA10443149
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    02874547
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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