Hyperdontia
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| Hyperdontia Classification and external resources |
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| Supernumerary teeth at premaxillary area | |
| ICD-10 | K00.1 |
| ICD-9 | 520.1 |
Hyperdontia is the condition of having supernumerary teeth, or teeth which appear in addition to the regular number of teeth. The most common supernumerary tooth is a mesiodens, which is a mal-formed, peg-like tooth that occurs between the maxillary central incisors.
Fourth and fifth molars that form behind the third molars are another kind of supernumerary teeth. [1]
Another rare type of supernumerary teeth is a "third set of teeth" that forms underneath and pushes out the second set of teeth, much like the second set formed underneath and pushed out the first set of teeth. [2] [3]
There is evidence of hereditary factors along with some evidence of environmental factors leading to this condition. Many supernumerary teeth never erupt, but they may delay eruption of nearby teeth or cause other dental problems. Molar-type extra teeth are the rarest form. Dental X-rays are often used to diagnose hyperdontia.
A similar condition is hypodontia, in which there are fewer than the usual number of teeth.
Hyperdontia is seen in a number of disorders, including Gardner's syndrome and cleidocranial dysostosis where multiple supernumerary teeth are seen that are usually impacted. It is suggested that supernumerary teeth develop from a third tooth bud arising from the dental lamina near the permanent tooth bud or possibly from splitting the permanent tooth bud itself. Supernumerary teeth in deciduous dentition are less common than in permanent dentition.
[edit] References
- ^ Kokten G, Balcioglu H, Buyukertan M. Supernumerary Fourth and Fifth Molars: A Report of Two Cases. Journal of Contemporary Dental Practice, 2003 November; (4)4:067-076. Page accessed February 10, 2007.
- ^ "Wikianswers: Is it true that some people grow three sets of teeth?". Page accessed 2008-03-06.
- ^ "Yahoo answers: Have you ever grown an extra set of teeth or heard of anyone doing so ?". Page accessed 2008-03-06.
- Tooth Conditions and Abnormalities at mchoralhealth.org
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