関: supernumerary tooth

WordNet

connect with a tee; "tee two pipes"
support holding a football on end and above the ground preparatory to the kickoff (同)football tee
a short peg put into the ground to hold a golf ball off the ground (同)golf tee
the starting place for each hole on a golf course; "they were waiting on the first tee" (同)teeing ground
place on a tee; "tee golf balls" (同)tee_up
a minor actor in crowd scenes (同)spear carrier, extra
a person serving no apparent function; "reducing staff is difficult because our employees include no supernumeraries"
the eruption through the gums of baby teeth (同)dentition, odontiasis

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(ゴルフの)ティー(最初のボールを打つときに地面に刺して載せる小さな台くぎ;また最初のボールを打つ場所) / 〈ボール〉‘を'ティーにのせる《+up+名,+名+up》
定数(員)以上の,余分な(extra);臨時の / 端役の / 定員外の人,過剰物;臨時雇い / (演劇の)端役
tooth の複数形

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/19 07:02:54」(JST)

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Hyperdontia is the condition of having supernumerary teeth, or teeth that appear in addition to the regular number of teeth. They can appear in any area of the dental arch and can affect any dental organ.

Types

Dental stone model showing mesiodens and accessory tooth behind right central incisor

Supernumerary teeth can be classified by shape and by position. The shapes include the following:

Supplemental (where the tooth has a normal shape for the teeth in that series);
Tuberculate (also called barrel shaped);
Conical (also called peg shaped);
Compound odontoma (multiple small tooth-like forms);
Complex odontoma (a disorganized mass of dental tissue)^[1]

When classified by position, a supernumerary tooth may be referred to as a mesiodens, a paramolar, or a distomolar.^[1]

The most common supernumerary tooth is a mesiodens, which is a malformed, 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. ^[2]

Causes

There is evidence of hereditary factors along with some evidence of environmental factors leading to this condition. While a single excess tooth is relatively common, multiple hyperdontia is rare in people with no other associated diseases or syndromes.^[3] Many supernumerary teeth never erupt, but they may delay eruption of nearby teeth or cause other dental or orthodontic problems.^[4]^[5] Molar-type extra teeth are the rarest form. Dental X-rays are often used to diagnose hyperdontia.

It is suggested that supernumerary teeth develop from a second tooth bud arising from the dental lamina near the regular tooth bud or possibly from splitting the regular tooth bud itself. Supernumerary teeth in deciduous (baby) teeth are less common than in permanent teeth.

Related conditions

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.

References

^ ^a ^b Oxford Handbook of Clinical Dentistry
^ 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 December 13, 2010.
^ M.N. Pereira, L.E. de Almeida, M.T. Martins et al. (October 2011). "Multiple hyperdontia: Report of an unusual case". American Journal of Orthodontics and Dentofacial Orthopedics 140 (4): 580–584. doi:10.1016/j.ajodo.2010.02.038. PMID 21967947. Retrieved March 25, 2014.
^ Vahid-Dastjerdi E, Borzabadi-Farahani A, Mahdian M, Amini N (2011). "Supernumerary teeth amongst Iranian orthodontic patients. A retrospective radiographic and clinical survey.". Acta Odontol Scand. 69 (2): 125–128. doi:10.3109/00016357.2010.539979. PMID 21142585.
^ Fleming PS, Xavier GM, DiBiase AT, Cobourne MT (2010). "Revisiting the supernumerary: the epidemiological and molecular basis of extra teeth.". Br Dent J. 208 (1): 25–30. doi:10.1038/sj.bdj.2009.1177. PMID 20057458.

External links

Dentistry portal

Tooth Conditions and Abnormalities at mchoralhealth.org
Supernumerary and Extra teeth
Supernumerary Teeth -An Overview of Classification, Diagnosis and Management

UpToDate Contents

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1. 歯の発達障害 developmental defects of the teeth
2. 家族性腺腫性ポリポーシスの臨床症状および診断 clinical manifestations and diagnosis of familial adenomatous polyposis
3. 口囲（口周囲の）皮膚炎 perioral periorificial dermatitis
4. 歯の解剖学的構造および発達 anatomy and development of the teeth
5. 小児における夢遊およびその他の錯眠 sleepwalking and other parasomnias in children

English Journal

Pattern of clefts and dental anomalies in six-year-old children: a retrospective observational study in western Norway.

Sæle P1, Østhus E2, Ådalen S2, Nasir EF1,2,3, Mustafa M1.
Acta odontologica Scandinavica.Acta Odontol Scand.2017 Mar;75(2):100-105. doi: 10.1080/00016357.2016.1260770. Epub 2016 Nov 29.
OBJECTIVES: Clefts of the lip and/or palate (CL/P) are the most common congenital disorders of the head and neck. In Norway, the incidence is 1.9/1000 live births. The aim of this study was to investigate the frequency and distribution of various types of clefts and dental anomalies in patients trea
PMID 27897086

[Unerupted first deciduous molar located higher to the first premolar: a case report].

Zhan Y1, Liu H2.
Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences.Beijing Da Xue Xue Bao.2017 Feb 18;49(1):181-183.
Tooth eruption is defined as the movement of a tooth from its site of development within the alveolar process to its functional position in the oral cavity. The process of tooth eruption can be divided into different phases: pre-eruptive bone stage, alveolar bone stage, mucosal stage, preocclusal st
PMID 28203028

Bilateral supplemental maxillary central incisors with double-tooth like appearance.

Anthonappa RP1, Sudhakar S2, King NM3.
European archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry.Eur Arch Paediatr Dent.2017 Feb 15. doi: 10.1007/s40368-017-0269-9. [Epub ahead of print]
BACKGROUND: Supplemental teeth refer to extra teeth that resemble the normal tooth series. Bilateral supplemental central incisors in a healthy individual are rare and bilateral supplemental incisors with double-tooth like appearance are exceptionally rare and has not been previously reported in the
PMID 28205161