Hypodontia
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| Hypodontia Classification and external resources |
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| ICD-10 | K00.0 |
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| ICD-9 | 520.0 |
In dentistry, hypodontia is the condition of naturally having fewer than the regular number of teeth. Hypodontia describes a situation when there is a missing number of 6 teeth or fewer. The condition of missing over 6 teeth is called oligodontia.
In caucasians, the most commonly missing teeth are the wisdom teeth (25-35%), the upper lateral incisors (2%) or the lower second premolars (3%). The congenital absence of all teeth is called anodontia.
Hypodontia is often familial, and can be associated with ectodermal dysplasia or Down syndrome. The Journal of the American Dental Association published preliminary data suggesting a statistical association between hypodontia of the permanent teeth and epithelial ovarian cancer (EOC). The study shows that women with EOC are 8.1 times more likely to have hypodontia than are women without EOC. The suggestion therefore is that hypodontia can serve as a "marker" for potential risk of EOC in women. (Journal of the American Dental Association, vol. 139, p. 163)
A similar condition is hyperdontia, in which there are more than the usual number of teeth.
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