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Sterilization Mode Effect on the Hydration Rate of Calcium Sulfate Hemihydrate

Published online by Cambridge University Press:  15 February 2011

T. R. Devine
T. R. Devine*
Affiliation:
USG Corporation, 700 N. Highway 45, Libertyville, Illinois 60048
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Abstract

Plaster bandages have been found to support bacteria. The sterilization of plaster (calcium sulfate hemihydrate) for use as an implant biomaterial is, therefore, a primary concern. Heat sterilization can significantly alter material properties and the kinetics of plaster hydration. A study has been done of the effects of sterilization by gamma radiation and by ethylene oxide on the hydration rate of plaster. Three hemihydrate bases with differing water requirements and hydration rates were sterilized by each method. Adiabatic temperature rise was used to follow hydration. Five outcomes were measured and analyzed. These outcomes include the induction period, maximum rate of temperature rise (MRR), time to MRR, total temperature rise, and time to maximum temperature. Neither sterilization mode was found to significantly alter the hydration process of any of the plaster bases. From a material property standpoint, either gamma radiation or ethylene oxide treatment is preferred to heat sterization of calcium sulfate hemihydrate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 252: Symposium T – Tissue-Inducing Biomaterials , 1991 , 37
Copyright
Copyright © Materials Research Society 1992

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References

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