title: Abnormal behavior in adiabatic calorimetry of set dental stone.
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.
authors.affiliation: Department of Dental Materials Science, Nagasaki University School of Dentistry, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hisatsune
authors.forename: A M
authors.initials: AM
authors.lastname: el Araby
authors.forename: K
authors.initials: K
authors.lastname: Iwanuma
authors.forename: Y
authors.initials: Y
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Udoh
authors.forename: K
authors.initials: K
authors.lastname: Yasuda
mesh_terms: D002133:Calcium Sulfate / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D003890:Desiccation; D008422:Materials Testing; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D002133:Calcium Sulfate