title: Thermal behaviour of casting investment during setting.
abstract: The aim of this study was to examine the thermal reactions of silica-sol liquids for mixing investment powders using differential thermal analysis (DTA) and also the setting behaviour of the mixed powders using differential scanning calorimetry (DSC). The silica-sol liquids showed the appearance of vapourization (around 100 degrees C as a peak temperature) and combustion (200-300 degrees C) in DTA measurement. Mixed silica-sol investment exhibited the setting behaviour with an exotherm in the DSC measurement representing that greater peak time, setting time and heat in mixed investment than with gypsum-bonded investment.
authors.affiliation: Department of Dental Materials, Hiroshima University, School of Dentistry, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Wakasa
authors.forename: M
authors.initials: M
authors.lastname: Yamaki
mesh_terms: D000433:1-Propanol / Q000737:chemistry; D002133:Calcium Sulfate / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D003734:Dental Casting Investment / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D005782:Gels; D006358:Hot Temperature; D011208:Powders; D012822:Silicon Dioxide / Q000737:chemistry; D012996:Solutions; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D014835:Volatilization; D014867:Water / Q000737:chemistry
chemical_list: D003734:Dental Casting Investment; D005782:Gels; D011208:Powders; D012996:Solutions; D014867:Water; D000431:Ethanol; D012822:Silicon Dioxide; D000433:1-Propanol; D002133:Calcium Sulfate