Final answer:
Casting wax is the firm restorative wax used to fill large cavities or model features.
Step-by-step explanation:
The firm restorative wax used to fill large cavities or model features is called casting wax. The firm wax used for filling cavities or modeling in mortuary science is known as wound filler wax or modeling wax.
The firm restorative wax used to fill large cavities or model features is called wound filler wax or modeling wax. This type of wax is commonly used in the field of mortuary science for restorative art processes, including reconstruction of facial features on a deceased individual. It is designed to be pliable and take on the color and texture of human skin, allowing for a natural-looking repair.