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Abnormal behavior in adiabatic calorimetry of set dental stone
K Hisatsune1, A M el Araby, K Iwanuma
1Department of Dental Materials Science, Nagasaki University School of Dentistry, Japan.
Abstract:
Dehydration in set dental stone was studied by employing specific heat measurements. Dehydration proceeds in two steps in air. In the case of bulk samples, especially those made with a lower water-powder ratio, three endothermic reaction stages are observed; a reaction of the dihydrate to the hemihydrate is apparently separated in two, one of which is not inherent. It is thought that the occurrence of a new peak is due to the difficulty for the dehydrated water to escape, depending on the porosity of the set stone.
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