Supernumerary teeth are teeth in excess of the numberfound in the normal series.1 The prevalence of supernu-merary teeth in the permanent dentition of the white population is about 2 % to 3%, and about 90 % of all super-numerary teeth occur in the premaxilla.2–5 Supernumerary premolars have been rep...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.464.2422 http://cda-adc.ca/jadc/vol-71/issue-6/390.pdf |
| Summary: | Supernumerary teeth are teeth in excess of the numberfound in the normal series.1 The prevalence of supernu-merary teeth in the permanent dentition of the white population is about 2 % to 3%, and about 90 % of all super-numerary teeth occur in the premaxilla.2–5 Supernumerary premolars have been reported to represent 3 % to 9 % of all supernumerary teeth, and their prevalence ranges from 0.29 % to 0.64%.4–7 Dens evaginatus is a developmental anomaly that manifests as a tubercle emerging from the surface of the affected tooth; it occurs most frequently in the premolars.8 The occurrence of dens evaginatus shows great racial differences, with a higher prevalence among people of Mongoloid origin. This anomaly has been found in 3 % to 4.8 % of Chinese and Eskimo popula-tions, but is rare in white populations.9–11 Both supernumerary premolars and dens evaginatus occur most frequently in the mandible.8,12 The exact mechanisms for the formation of these anomalies are not known. Dens evagina-tus is thought to form from the evagination of an area of the inner enamel epithelium and its subjacent odontogenic mesen-chyme into the dental organ during the morphodifferentiation stage of tooth development.13 Supernumerary teeth are believed to be caused by locally conditioned hyperactivity of the dental lamina, which results in initiation and proliferation of additio-nal tooth buds.1,7 The higher prevalence of these anomalies among first-degree relatives of affected individuals than in the general population suggests a significant genetic component in their development.1,14 Environmental factors, however, may also play a part. The association of supernumerary premolars with dens evaginatus has been reported only infrequently.10 This article reports 2 cases of concomitant occurrence of supernume-rary premolars and dens evaginatus. |
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