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J Dent Res 24(2): 65-75, 1945
© 1945 International and American Associations for Dental Research
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CHANGES IN THE COMPOSITION AND SETTING CHARACTERISTICS OF PLASTER OF PARIS ON EXPOSURE TO HIGH HUMIDITY ATMOSPHERES

ALAN S. BUCHANAN B.SC.1 and HOWARD K. WORNER D.SC., A.A.C.I.1

1 Materials Research Laboratory, Australian College of Dentistry, Melbourne, Australia

Samples of dental plasters were exposed to atmospheres of 75% and 100% relative humidity for prolonged periods and tested at regular intervals. Both analytical and microscopic evidence showed that the plasters absorbed water from the moist atmosphere and underwent hydration to CaSO4·2H2O. The rate of absorption of moisture at any particular humidity appears to depend mainly on the quantity of dehydrate already present in the plaster. The setting rate increases continuously on exposure, ultimately making the plaster unusable.

Submitted on January 3, 1945






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