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Gypsum is used to create:
Impressions of edentulous arches (inelastic thermoset)
Composition of Dental Gypsum Products
Extracted from the mineral gypsum
Chemically all dental gypsum products are derived from calcium sulfate dihydrate (In its pure form is white in color)
All dental gypsum products are produced through a process of heating gypsum and driving off part of the water of crystallization
The result is the driving off of 1 1/2 H2O
Products differ in characteristics due to the type of calcination process used
Impression Plaster defined
AKA Type I gypsum product;
(for edentulous patients; usually mint flavored)
AKA Type III gypsum product; alpha-hemihydrate; Trade names: Hydro cal, Capstone (also called Class I stone) Lab stone
Die Stone defined
AKA Type IV gypsum product;
improved stone; TM Density; Die keen (also called Class II stone) Die stone
Study models; casts for the fabrication of partial and complete dentures, and appliances like athletic mouthguards
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