Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia.
Related to apical fiber: Gingival fibers, transseptal fibers, oblique fibers, periodontal ligament fibers
one of the many fibers of the periodontal ligament. These fibers radiate around the apex of the tooth at approximately right angles to their cementum attachment, extending into the bone at the bottom of the alveolus. Apical fibers resist forces that tend to lift the tooth from its socket and, with the other fibers of the periodontal ligament, stabilize the tooth against tilting movements.