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Ankylosis of tooth

MedGen UID:
Concept ID:
Disease or Syndrome
Synonyms: Abnormal fusion of dental cementum with alveolar bone; Ankylosis of teeth; Dental ankylosis; Molar I reinclusion; Secondary retention of permanent molars; Tooth Ankylosis
SNOMED CT: Ankylosis of tooth (14901003)
HPO: HP:0033791
Monarch Initiative: MONDO:0008007
OMIM®: 157950
Orphanet: ORPHA1077


Secondary retention is the cessation of eruption of a tooth after emergence that does not result from a physical barrier in the path of eruption or an abnormal position of the tooth. Permanent molars are less frequently affected than deciduous molars. The major characteristic of a secondarily retained molar is infraocclusion, which may result in malocclusion because of tilting of the neighboring teeth and overeruption of antagonists. The disorder can also result in loss of the retained molar and neighboring teeth due to caries and periodontal disease and in deformation of the facial skeleton (Raghoebar et al., 1992). See also 125350 and 273050 for phenotypes with shared features of secondary retention of permanent molars. [from OMIM]

Clinical features

From HPO
Clinodactyly of the 5th finger
MedGen UID:
Concept ID:
Congenital Abnormality
Clinodactyly refers to a bending or curvature of the fifth finger in the radial direction (i.e., towards the 4th finger).
Abnormality of the dentition
MedGen UID:
Concept ID:
Any abnormality of the teeth.
Mandibular prognathia
MedGen UID:
Concept ID:
Abnormal prominence of the chin related to increased length of the mandible.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVAnkylosis of tooth
Follow this link to review classifications for Ankylosis of tooth in Orphanet.

Conditions with this feature

Otodental syndrome
MedGen UID:
Concept ID:
Disease or Syndrome
Otodental syndrome is an autosomal dominant condition characterized by grossly enlarged canine and molar teeth (globodontia), associated with sensorineural hearing loss. Ocular coloboma segregating with otodental syndrome has been reported (summary by Gregory-Evans et al., 2007).

Professional guidelines


Hori M, Kawano M, Kaneko K, Hasegawa M, Okaue M, Matsumoto M, Tanaka H, Hobo T
J Nihon Univ Sch Dent 1996 Dec;38(3-4):123-30. doi: 10.2334/josnusd1959.38.123. PMID: 9058994

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