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Cotton and plaster casting material (plaster cast), 4ply Plaster casts consist of a cotton bandage that has been combined with plaster of paris , which hardens after it has been made wet. Plaster of Paris is calcined gypsum (roasted gypsum), ground to a fine powder by milling.
Mold application. Mould material is applied to the surface of the model's body. The mould material is usually applied as a thick liquid that takes the shape of the body. Body parts may also be dunked into containers of mold media (except plaster). Mold curing and reinforcement. The applied mold material cures to a more rigid and solid state.
In place of traditional casting techniques, Segal pioneered the use of plaster bandages (plaster-impregnated gauze strips designed for making orthopedic casts) as a sculptural medium. In this process, he first wrapped a model with bandages in sections, then removed the hardened forms and put them back together with more plaster to form a hollow ...
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 ...
Like sand casting, plaster mold casting is an expendable mold process, however it can only be used with non-ferrous materials. It is used for castings as small as 30 g (1 oz) to as large as 7–10 kg (15–22 lb). Generally, the form takes less than a week to prepare. Production rates of 1–10 units/hr can be achieved with plaster molds. [1] [2]
Lifecast molds are made from prosthetic alginate or more recently, from skin-safe platinum silicone rubber. This initial mold can be relatively weak but flexible. A hard mother mold, also known as a jacket or matrix, is typically made of plaster bandage which is created over the outside of the initial flexible mold to provide support.
The adhesive bandage protects the wound and scab from friction, bacteria, damage, and dirt. Thus, the healing process of the body is less disturbed. Some of the dressings have antiseptic properties. An additional function is to hold the two cut edges of the skin together to make the healing process faster. [1]
The foam is able to mold according to the shape of the wound. [9] Hydrogel dressing: This dressing is made up of synthetic polymers such as methacrylate and polyvinyl pyrrolidine. It has high water content, thus provides moisture and cooling effect for the wound. The dressing is easy to remove from the wound without causing any damage.