Porosity of dental gypsum-bonded investments in setting and heating process
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- ASAOKA Kenzo
- Department of Biomaterials & Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School
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- BAE Ji-Young
- Department of Biomaterials & Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School
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- LEE Hae-Hyoung
- Department of Biomaterials Science, School of Dentistry, Dankook University
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説明
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
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- Dental Materials Journal
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Dental Materials Journal 31 (1), 120-124, 2012
一般社団法人 日本歯科理工学会
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詳細情報 詳細情報について
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- CRID
- 1390001204715350144
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- NII論文ID
- 10030128480
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- NII書誌ID
- AA10443149
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- ISSN
- 18811361
- 02874547
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- PubMed
- 22277615
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可