What type of tissue typically lines the apical foramen in a mature permanent tooth?

Explanation

The apical foramen of a fully developed permanent tooth is generally surrounded by cementum, which covers the root and extends to the apex, providing a protective lining. Dentin forms the bulk of the tooth beneath the enamel, while epithelial rest cells and the epithelial diaphragm are related to tooth development but do not line the apical foramen.