A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.
    

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SEM bone, eroded calcium sulphate crystals

Calcium Sulfate

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Plastic apparatus in surgery : with especial reference to that variety made with plaster of Paris / by Samuel B. St. John.

Report to the Local Government Board by Dr. J. M. Hamill on the presence of calcium sulphate in baking powder and self-raising flour.

Plaster of Paris and how to use it / by Martin W. Ware.

Treatment of talipes equinus varus by plaster of Paris / by Edward LeRoy Barnett.

On the advantages of plaster-of-Paris dressings as a means of spinal support / by Lewis A. Sayre.