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
relating to or accompanying birth; "natal injuries"; "natal day"; "natal influences"
of or relating to the buttocks
a region of eastern South Africa on the Indian Ocean; "Natal was renamed KwaZulu-Natal in 1994" (同)KwaZulu-Natal
a port city in northeastern Brazil
the eruption through the gums of baby teeth (同)dentition, odontiasis

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/22 16:36:58」(JST)

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Natal teeth are teeth that are present above the gumline (have already erupted) at birth, and neonatal teeth are teeth that emerge through the gingiva during the first month of life (the neonatal period).^[1]

The incidence of neonatal teeth varies considerably, between 1:700 and 1:30,000 depending on the type of study; the highest prevalence is found in the only study that relies on personal examination of patients.^[2]

Presentation

Most often natal teeth are mandibular central incisors.^[3] They have little root structure and are attached to the end of the gum by soft tissue and are often mobile.^[4]

Causes

Most of the time, natal teeth are not related to a medical condition. However, sometimes they may be associated with:^[4]

Ellis–van Creveld syndrome^[4]^[5]
Hallermann–Streiff syndrome^[4]
Pierre Robin syndrome^[4]
Sotos syndrome^[4]

Treatment

No intervention is usually recommended unless they are causing difficulty to the infant or mother.^[2]

However some recommend that they be removed as the tooth can cut or amputate the tip of the tongue.

They should be left in the mouth as long as possible to decrease the likelihood of removing permanent tooth buds with the natal tooth.^[6] They should also not be removed if the infant has hypoprothrombinemia.^[6] In case of complications when the natal teeth need to be removed, dental radiographs should be obtained whenever possible, and evaluated and followed up with pediatric dentists.^[6]

Notable cases

Napoleon Bonaparte^[7]
Louis XIV^[7]
Richard III^[7]
Ivan the Terrible^[7]
Kate Mulgrew^[8]

References

^ Seminario, AL; Ivancaková, R (2004). "Natal and neonatal teeth.". Acta medica (Hradec Kralove) / Universitas Carolina, Facultas Medica Hradec Kralove 47 (4): 229–33. PMID 15841901.
^ ^a ^b MASSLER, M; SAVARA, BS (March 1950). "Natal and neonatal teeth; a review of 24 cases reported in the literature.". The Journal of pediatrics 36 (3): 349–59. doi:10.1016/S0022-3476(50)80105-1. PMID 15405415.
^ Kates, GA; Needleman, HL; Holmes, LB (September 1984). "Natal and neonatal teeth: a clinical study". Journal of the American Dental Association (1939) 109 (3): 441–3. PMID 6592231.
^ ^a ^b ^c ^d ^e ^f "Natal teeth". MedlinePlus : U.S. National Library of Medicine. Retrieved 7 April 2013.
^ "Ellis-van Creveld syndrome". MedlinePlus : U.S. National Library of Medicine. Retrieved 7 April 2013.
^ ^a ^b ^c Martinez, CR (March 1978). "Management of natal teeth". The Journal of family practice 6 (3): 654–5. PMID 632777.
^ ^a ^b ^c ^d Berkovitz, Barry K.B (2012). Nothing but the Tooth: A Dental Odyssey. Newnes. p. 12. ISBN 9780123971937. Retrieved 8 July 2014.
^ Fallon, Kevin (April 28, 2015). "Kate Mulgrew Bares Her Teeth". The Daily Beast. Retrieved May 1, 2015.

UpToDate Contents

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1. 歯の発達障害 developmental defects of the teeth
2. 新生児の評価 assessment of the newborn infant
3. 下顎、口、口腔、および咽頭の先天異常 congenital anomalies of the jaw mouth oral cavity and pharynx
4. 授乳および離乳の一般的問題 common problems of breastfeeding and weaning
5. 妊娠中の異食症 pica in pregnancy

English Journal

Pachyonychia Congenita Type 2 (Jackson-Lawler Syndrome) or PC-17: Case Report.

Morais P, Peralta L, Loureiro M, Coelho S.SourcePaulo Morais, MD, Department of Dermatology and Venereology Hospital Infante D. Pedro, Avenida Artur Ravara, 3814-501 Aveiro, Portugal; paulomoraiscardoso@gmail.com.
Acta dermatovenerologica Croatica : ADC.Acta Dermatovenerol Croat.2013 May;21(1):48-51.
Pachyonychia congenita (PC) is a rare genodermatosis caused by mutations in any of the four genes KRT6A, KRT6B, KRT16, or KRT17, which can lead to dystrophic, thickened nails and focal palmoplantar keratoderma, among other manifestations. Although classically subdivided into two major variants, PC-1
PMID 23683487

Facial papules in an adolescent with a history of natal teeth.

Patel D, Ahmed A, Horii KA.SourceSchool of Medicine, University of Missouri, Kansas City, Missouri Department of Pathology Section of Dermatology, Children's Mercy Hospitals and Clinics, Kansas City, Missouri.
Pediatric dermatology.Pediatr Dermatol.2013 May;30(3):387-8. doi: 10.1111/j.1525-1470.2012.01785.x.
PMID 23617368