Ankylosis

Dental ankylosis occurs when the root of a tooth fuses with the alveolar bone, eliminating the periodontal ligament space that normally allows micro-movement. An ankylosed tooth typically sits lower than its neighbors because it cannot erupt as the jaw grows, and it produces a dull, solid sound when tapped instead of the usual resonant tone. Ankylosis is most common in primary molars and in teeth that have suffered trauma. Diagnosis is confirmed with radiographs and percussion testing. Treatment ranges from observation to extraction with space maintenance, depending on the patient's age and the tooth's position.