Dimensional Changes of Silicate Cements
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概要
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The linear dimensional changes of cylindrical specimens, 12mm high and 6mm in diameter, of twelve brands of silicate cement in distilled water, mineral oil and alternate drying and wetting cycles were observed.<BR>1. Three cements showed expansion in water, and the others showed contraction in water. Cements which expanded in water had comparatively slow setting time.<BR>2. In mineral oil, all cements contracted. Some cements displayed more contraction in oil than in water.<BR>3. The thinner the consistency, the larger the observed change in water. Mixes of standard consistency produced the least change in oil.<BR>4. Cements did not return to original dimensions after alternate drying and wetting.<BR>5. Delayed changes in water for 300 days and in oil for 500 days were observed. The changes in oil took place gradually and continued for a long time compared with the changes in water. The rate of changes in oil will indicate the setting speed or rate of powder/liquid reaction regardless of other factors.
- 日本大学歯学部の論文
日本大学歯学部 | 論文
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