ORTHO TAPE PLASTER OF PARIS CAST BANDAGES
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Plaster
of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4·0.5H2O. It is created by heating gypsum to about 150 °C. - 2CaSO4·4H2O → 2CaSO4·H2O
+ 3H2O (released as steam).
- *www.wikipedia.com
All plaster is exothermic producing some heat.
 Use in medicinePlaster is
widely used as a support for broken bones; a bandage impregnated with plaster is moistened and then wrapped around the damaged
limb, setting into a close-fitting yet easily removed tube, known as an orthopedic cast; however, this is slowly being replaced by a fibreglass variety. Plaster
is also used within radiotherapy when making immobilisation casts for patients. Plaster bandages are used when constructing
an impression of the patients head and neck, and liquid plaster is used to fill the impression and produce a plaster bust.
Perspex is then vacuum formed over this bust creating an immobilisation shell. In dentistry,
plaster is used for mounting casts or models of oral tissues. These diagnostic and working models are usually made from dental
stone, a stronger, harder and denser derivative of plaster which is manufactured from gypsum under pressure. Plaster is also
used to invest or flask wax dentures, the wax being subsequently removed and replaced with the final denture base material
which is cured in the plaster mold.
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