Cavity design refers to the process of creating spaces or voids within a material or structure, often used in fields like engineering and architecture. This design is crucial for optimizing the performance of products, such as in the creation of molds for plastic injection or metal casting. Proper cavity design can enhance strength, reduce weight, and improve thermal or acoustic properties. In the context of dentistry, cavity design involves the preparation of a tooth that has been affected by decay. The dentist shapes the cavity to remove decayed tissue and create a suitable space for filling materials. This ensures that the restoration is secure and helps prevent further decay.