Definition, Rarity, and Epidemiology
- Tooth ankylosis is the fusion between a tooth and underlying bony support tissues.
- It is a rare pathological condition in both deciduous and permanent teeth.
- The prevalence of tooth ankylosis is still unknown.

Risk Factors, Diagnosis, and Causes
- Risk factors for tooth ankylosis include genetic factors and dental trauma.
- Diagnostic methods include clinical examinations, x-rays, and cone beam computerised tomography (CBCT).
- The causes of tooth ankylosis are uncertain, but trauma, inflammation, and infection may contribute.

Signs and Symptoms
- Tooth ankylosis can be recognised clinically by the loss of physiological mobility.
- Radiographic detection may show loss of periodontal ligament space and evidence of replacement resorption.
- Symptoms may vary depending on the growing state of teeth.
- Decreased tooth count is a common symptom of tooth ankylosis.

Treatment and Prevention
- Treatment for tooth ankylosis often involves removing the crown of the affected tooth.
- Early orthodontic interception can help promote the recovery of lost space and tooth eruption.
- Prevention and early intervention are crucial to avoid further progression and complications.
- Interceptive orthodontic treatment has shown positive results in promoting space recovery.

Long-Term Stability and Treatment Options
- Stability of interceptive/corrective orthodontic treatment for tooth ankylosis and Class II mandibular deficiency has been studied.
- Orthosurgical treatment including anchorage from a palatal implant has been used to correct an infraoccluded maxillary first molar.
- The effectiveness of the decoronation technique in the treatment of ankylosis has been evaluated.
- Replantation and avulsion of permanent teeth have been studied, including survival rates and clinical outcomes.
- Classification and diagnostic tools, as well as dental pathology and histological assessments, have been used in the diagnosis of tooth ankylosis.