Type : Phenotype or locus, molecular basis unknown;
Alternative titles and symbols : Ankylosis of teeth; Dental ankylosis; Molar I reinclusion;
Description : 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.;