Plaster bandage hand casting9/25/2023 ![]() ![]() A short arm cast, in contrast, stops just below the elbow. ![]() A long arm cast encases the arm from the hand to about 5 cm below the armpit, leaving fingers and thumbs free. Upper extremity casts encase the arm, wrist, or hand. Cast types Upper extremity Short arm cast on a child. In addition, plaster is much smoother and does not snag clothing or abrade the skin. However, plaster can be more easily moulded to make a snug and therefore more comfortable fit. These are lighter and dry much faster than plaster bandages. Ĭurrent bandages of synthetic materials are often used, often knitted fiberglass bandages impregnated with polyurethane, sometimes bandages of thermoplastic. The setting of unmodified plaster starts about 10 minutes after mixing and is complete in about 45 minutes however, the cast is not fully dry for 72 hours. When water is added, the more soluble form of calcium sulfate returns to the relatively insoluble form, and heat is produced.Ģ (CaSO 4 Plaster of Paris is calcined gypsum (roasted gypsum), ground to a fine powder by milling. Plaster bandages consist of a cotton bandage that has been combined with plaster of paris, which hardens after it has been made wet.
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