Seddon R P, Johnstone S C, Smith P B
Department of Paediatric Dentistry, King's Dental Institute, King's College School of Medicine and Dentistry, London.
Int J Paediatr Dent. 1997 Sep;7(3):177-84. doi: 10.1046/j.1365-263x.1997.00237.x.
This report describes 7-year-old Afro-Caribbean monozygotic twin boys who both presented with bilateral unerupted mesiodentes palatal to the central incisors. There have been two previous similar reports. From this case and previous reports it was concluded that mesiodentes in monozygotic twins are likely to be concordant with respect to the number of supernumerary teeth. Unilateral mesiodens usually have been mirror imaged in each twin. Minor discordance between monozygotic twins is common with respect to the shape (conical, incisiform or tuberculate) and orientation (inverted or normal) of individual mesiodens within and between each twin.
本报告描述了一对7岁的非洲加勒比裔同卵双胞胎男孩，他们双侧中切牙腭侧均有未萌出的额外牙。此前已有两篇类似报告。从该病例及之前的报告得出结论，同卵双胞胎的额外牙数量可能一致。单侧额外牙在每个双胞胎中通常呈镜像分布。同卵双胞胎之间在单个额外牙的形状（圆锥形、切牙形或结节状）和方向（倒置或正常）方面存在轻微不一致是常见的。
