What are plaster casts primarily made from?

Plaster casts are primarily made from rolled crinoline bandages impregnated with gypsum powder because gypsum provides the essential qualities needed for effective immobilization of fractures. When mixed with water, gypsum forms a paste that can be molded to the shape of the body part being treated. Once it hardens, it offers a rigid support that immobilizes the injured area, allowing for proper healing.

This material is favored for its ability to conform to the contours of the body, ensuring maximum contact with the skin, which enhances both security and comfort for the patient. The hydration process involved in setting the gypsum creates a durable and solid structure suitable for treating various orthopedic injuries. This composition also allows for adequate ventilation and moisture control while maintaining strength.

The other materials, such as plastic sheets, metal frames, and fiberglass, are used for different types of casts or splinting but do not possess the same properties of moldability and support that gypsum-based plaster does. Therefore, the unique characteristics of crinoline bandages with gypsum powder make it the primary choice for traditional plaster casting.