Which of the following is not a function of cementum?

Cementum is a specialized connective tissue that plays several key roles in dental anatomy. It covers the roots of teeth, providing a protective layer that helps anchor the periodontal fibers that link the teeth to the surrounding alveolar bone. This protective function is critical for maintaining the integrity of the tooth structure against external forces that may arise from chewing and other activities.

Additionally, cementum serves a role in the nourishment of the teeth indirectly through the periodontal ligament, which is vital for supporting the tooth in its socket and enabling communication between the alveolar bone and the tooth root. However, it is not involved in lining the bony sockets directly. That function is performed by the bone itself, which forms the bony apparatus that holds the teeth in place.

Thus, the assertion that cementum lines the bony sockets is incorrect, as it does not fulfill this role; rather, it contributes to the attachment and protection of the tooth roots.