Sharma Urvashi, Gulati Anubha, Gill Namrata C
Department of Pedodontics, Dr. HSJ Institute of Dental Sciences and Hospital, Panjab University, Chandigarh, India.
Contemp Clin Dent. 2013 Jan;4(1):94-6. doi: 10.4103/0976-237X.111616.
Odontogenesis is a complex process wherein more than 200 genes are known to play a significant role in tooth development. An imbalance can lead to an abnormality in the number, size, shape or structure of the developing tooth/teeth. The presence of an extra dental lamina forms a supernumerary tooth. The supernumerary teeth are of two types: A rudimentary tooth where the supernumerary tooth does not resemble any tooth in the normal series or a supplemental tooth in which this anomalous tooth resembles one in the normal series. It is also very rare to encounter triple teeth in primary dentition. The union of these teeth may be through fusion, gemination, concrescence or a combination of fusion and gemination. Presented is a rare case of concrescence involving maxillary deciduous incisors and a supplemental tooth in a 7-year-old boy. The differential diagnosis, etiology, and complications of primary anterior triple teeth are discussed.
牙齿发育是一个复杂的过程，已知有200多个基因在牙齿发育中发挥重要作用。失衡会导致发育中的牙齿在数量、大小、形状或结构上出现异常。额外牙板的存在会形成多生牙。多生牙有两种类型：一种是发育不全的牙齿，即多生牙与正常牙列中的任何牙齿都不相似；另一种是补充牙，即这种异常牙齿与正常牙列中的某颗牙齿相似。在乳牙列中出现三颗牙齿的情况也非常罕见。这些牙齿的联合可能通过融合、双生、粘连或融合与双生的组合。本文呈现了一例罕见的粘连病例，涉及一名7岁男孩的上颌乳切牙和一颗补充牙。讨论了原发性前牙三颗牙的鉴别诊断、病因及并发症。
