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牙中牙又名牙套叠、扩张性复合牙瘤,1859年Tomes首先描述,是牙齿发育上的异常:由于牙乳头在生长发育过程中的变异形成了套叠,这种套叠所造成单个或多个的突起,可止于牙冠,也可伸展到牙根的全长。牙中牙并非少见,X线照相检查其发生率从0.25%至高达10%,这差异可能是因作者们对诊断标准的看法不一所致。牙中牙常发生在上颌侧切牙,很少在下颌牙列、乳牙、双侧部位或多生牙发生。
Tooth also known as anastomosis, expansion of compound odontoma, Tomes first described in 1859, is the development of teeth abnormalities: Due to the growth and development of dental papillae in the formation of a nested, this nested caused by a single or Multiple protrusions can stop at the crown, but also extend to the full length of the root. Tooth is not uncommon in teeth, the incidence of X-ray examination from 0.25% to as high as 10%, the difference may be due to the authors on the diagnostic criteria vary. Teeth often occurs in the maxillary lateral incisors, rarely in the mandibular dentition, deciduous teeth, bilateral parts or multiple births occur.