A plaster cast is a medical device used to immobilize and support a broken or injured bone. It is also known as a gypsum cast or a cast. In addition to these terms, other synonyms for plaster casts include immobilizer, splint, or brace. An immobilizer is typically made of materials such as foam or plastic, while a splint is made of plaster or fiberglass. A brace may also be used to stabilize and support a broken bone. While each of these devices is used to support injured limbs, they vary in their construction, materials, and level of immobility. Depending on the severity of the injury, different types of casts may be recommended by doctors and medical professionals.