Hyperdontia Classification and external resources
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 International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify Diseases The International Statistical Classification of Diseases and Related Health Problems 10th Revision ( ICD -10) is a coding of diseases and signs symptoms abnormal findings K00-K93 - Diseases of the digestive system (K00-K14 Diseases of oral cavity salivary glands and jaws ( Disorders of Tooth development and Eruption The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify Diseases The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. Supernumerary body parts are most commonly a Congenital disorder involving the growth of an additional part of the Body and a deviation from the Body plan The most common supernumerary tooth is a mesiodens, which is a mal-formed, peg-like tooth that occurs between the maxillary central incisors. The maxillary central incisor is a human Tooth in the front upper jaw or Maxilla, and is usually the most visible of all teeth in the mouth

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. Molars are the rearmost and most complicated kind of Tooth in most Mammals In many mammals they grind food hence the Latin name mola, " Millstone Dental X-rays are often used to diagnose hyperdontia. X-radiation (composed of X-rays) is a form of Electromagnetic radiation.

A similar condition is hypodontia, in which there are fewer than the usual number of teeth. In Dentistry, hypodontia is the condition of naturally having fewer than the regular 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. Gardner's syndrome is a genetic disorder characterized by the presence of multiple polyps in the colon together with tumors outside the colon Cleidocranial dysostosis, also called Cleidocranial dysplasia, is a Hereditary Congenital disorder due to Haploinsufficiency caused by mutations 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.

References

• Tooth Conditions and Abnormalities at mchoralhealth. org

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