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Newly applied short leg cast Plaster of Paris short leg walking cast with toeplate. The short leg cast is designed to immobilize the lower leg and ankle, extending from just below the knee to the toes. It is used to treat less severe injuries, such as ankle fractures, foot fractures, or severe sprains.
Plaster 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. Plaster is also used in preparation for radiotherapy when fabricating individualized immobilization shells for patients ...
With judicious heating, gypsum converts to the partially dehydrated mineral called bassanite or plaster of Paris. This material has the formula CaSO 4 ·(nH 2 O), where 0.5 ≤ n ≤ 0.8. [8] Temperatures between 100 and 150 °C (212–302 °F) are required to drive off the water within its structure.
However, plaster of Paris casts take too long to fully dry and limits patient mobility for up to 74 hours — if the patient walks on the cast during this time, the shape will change, and the cast will not protect the foot and wound correctly. [10] Fiberglass casts were introduced in the 1980s or 1990s.
Plaster mold casting is a metalworking casting process similar to sand casting except the molding material is plaster of Paris instead of sand.Like sand casting, plaster mold casting is an expendable mold process, however it can only be used with non-ferrous materials.
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". [9] Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris. Upon adding water, after a few dozen minutes, plaster of Paris becomes ...
A custom dental model or plaster cast. A dental impression is a negative imprint of hard and soft tissues in the mouth from which a positive reproduction, such as a cast or model, can be formed. It is made by placing an appropriate material in a dental impression tray which is designed to roughly fit over the dental arches.
Plaster of Paris, a white powdery substance used mostly for casts and molds in the form of a quick-setting paste with water, began to be used for immobilizing splints. [10] This method was not a popular way of splinting as it took too long to dry and suitable fabric was sparse.