Turner's hypoplasia
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2008-06-25T19:44:17Z
VolkovBot
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robot Adding: [[pt:Dente hipoplásico de Turner]]
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ICD9 = {{ICD9|520.4}} |
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'''Turner's hypoplasia''' is an abnormality found in [[tooth|teeth]]. Its appearance is variable, though usually is manifested as a portion of missing or diminished [[tooth enamel|enamel]] on permanent teeth. Unlike other abnormalities which affect a vast number of teeth, Turner's hypoplasia usually affects only one tooth in the [[mouth]] and, it is referred to as a '''Turner's tooth'''.
==Outcome==
If Turner's hypoplasia is found on a [[Canine tooth|canine]] or a [[premolar]], the most likely cause is an [[infection]] that was present when the primary (baby) tooth was still in the mouth. Most likely, the primary tooth was heavily [[tooth decay|decayed]] and an area of [[inflammation|inflamed]] [[Biological tissue|tissues]] around the [[root]] of the tooth (called a [[periapical]] [[inflammation]]), affecting the [[tooth development|development of the permanent tooth]]. The tooth most likely affected by this cause is the [[canine tooth]]. The appearance of the abnormality will depend on the severity and longevity of the infection.
If Turner's hypoplasia is found in the front (anterior) area of the mouth, the most likely cause is a traumatic injury to a primary tooth. The traumatized tooth, which is usually a [[maxillary central incisor]], is pushed into the developing tooth underneath it and consequently affects the [[amelogenesis|formation of enamel]]. Because of the location of the permanent tooth's developing [[tooth bud]] in relation to the primary tooth, the most likely affected area on the permanent tooth is the facial surface (the side closer to the [[lip|lips]] or [[cheek]]). White or yellow discoloration may accompany Turner's [[hypoplasia]]. [[Tooth enamel|Enamel]] hypoplasia may also be present.
Turner's hypoplasia usually affects the tooth enamel if the trauma occurs prior to the third year of life. Injuries occurring after this time are less likely to cause enamel defects since the enamel is already calcified.
The same type of injury is also associated with the [[dilaceration]] of a tooth.
==References==
*Kahn, Michael A. Basic Oral and Maxillofacial Pathology. Volume 1. 2001.
{{dentistry-stub}}
{{Oral pathology}}
[[Category:Oral pathology]]
[[Category:Dental disorders]]
[[Category:Enamel]]
[[Category:Teeth]]
[[pt:Dente hipoplásico de Turner]]