What is the term for the tissue fiber that attaches a tooth to the bone?

• A. Gingiva
• B. Alveolar bone
• C. Pulp
• D. Periodontal ligament

Answer: (D)

The tissue fiber that attaches a tooth to the bone is the periodontal ligament. This specialized fibrous connective tissue surrounds the tooth root and anchors it to the alveolar bone by collagen fibers that insert into the cementum on the tooth and into the surrounding bone. It holds the tooth in place, helps absorb and distribute chewing forces, and allows a tiny amount of movement during function.

Gingiva is the gum tissue that covers the bone and surrounds the teeth but doesn’t attach the tooth to bone. Alveolar bone is the bone that forms the tooth socket itself. Pulp is the soft tissue inside the tooth containing nerves and blood vessels.