拼错了,应为：【Turner'stooth】 　　学名叫做Turner'shypoplasia: 　　Turner'shypoplasiaisanabnormalityfoundinteeth. 　　Itsappearanceisvariable,thoughusuallyismanifestedasaportionofmissingordiminishedenamelonpermanentteeth.Unlikeotherabnormaliteswhichaffectavastnumberofteeth,Turner'shypoplasiausuallyaffectsonlyonetoothinthemouthand,itisreferredtoasaTurner'stooth. 　　特纳牙： 　　个别恒牙的釉质发育不全,常与其先行乳牙有关.因前磨牙的牙胚处在乳磨牙牙根分歧下方,难以避免乳磨牙根尖周炎症的影响,故个别牙的釉质发育不全,多见于前磨牙.个别前磨牙釉质形成和矿化障碍的现象首先由Turner报道,故又称特纳牙.