Final answer:
In an indirect pulp cap procedure, calcium hydroxide is placed first to protect the dental pulp and stimulate the formation of secondary dentin. This is followed by other materials before the final restoration.
Step-by-step explanation:
In the restoration of an indirect pulp cap, calcium hydroxide is placed first. This material helps to protect the dental pulp by stimulating the formation of secondary dentin and providing a barrier against bacterial toxins. Calcium hydroxide has a long history of use in endodontic therapy because of its ability to promote healing within the pulp tissue.
After applying calcium hydroxide, other materials such as glass ionomer cement or resin-modified glass ionomer can be placed over it before the final restoration with composite resin. Each layer serves a specific function in the multi-layered restoration process to ensure the longevity of the tooth and health of the pulp.