Skip to
  1. Homepage
  2. Rare diseases
  3. Search
Simple search

Simple search

(*) mandatory field


Other search option(s)

Dental ankylosis

Synonym(s) Ankylosis of teeth
Prevalence Unknown
Inheritance -
Age of onset Childhood
  • K03.5
  • C0155930
  • D020254
  • 10044019


Disease definition

Dental ankylosis is a rare disorder characterized by the fusion of the tooth to the bone, preventing both eruption and orthodontic movement.


The prevalence is unknown.

Clinical description

The periodontal ligament is obliterated by a 'bony bridge' and the tooth root is fused to the alveolar bone. Dental ankylosis can affect both primary and permanent teeth, may occur at any time during eruption and can lead to submergence. Permanent molars are less frequently affected than deciduous molars. Varying numbers of teeth may be affected. After eruption, it halts any adaptive changes. In a growing child, an ankylosed tooth appears to 'submerge' as adjacent unaffected teeth and alveolar bone continue their normal pattern of growth occlusally. The disorder may result in loss of the retained molar and neighboring teeth due to caries and periodontal disease, and in deformation of the facial skeleton (reduction in the height of the lower face, relative mandibular prognathism, posterior open bite). The major characteristic of a secondarily retained molar is infraocclusion that may result in malocclusion. Occasionally, dental ankylosis may be associated with fifth finger clinodactyly.


Etiology remains uncertain but a genetic predisposition to ankylosis with autosomal dominant inheritance has been suggested. Familial occurrence has been shown in several families. Trauma, inflammation or infection may play a causative role.

Diagnostic methods

Clinical examination and X-ray are the main diagnostic methods for detecting ankylosis.

Management and treatment

The recommended management includes removing the ankylosed tooth to ensure development and eruption of the permanent teeth, and surgery to expose, protect, or reposition the emerging tooth.

Expert reviewer(s)

  • Pr Agnès BLOCH-ZUPAN

(*) Required fields.

Attention: Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Captcha image
The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.