University of California at Los Angeles, USA.
Angle Orthod. 2011 Mar;81(2):341-9. doi: 10.2319/051910-270.1.
This report describes the two-phase orthodontic treatment of a 7-year-, 6-month-old girl who presented with bilateral gemination of the central incisors. The left side demonstrated a complete gemination, resulting in two separate teeth (#9 and #9a). On the right side the gemination was incomplete, resulting in a large tooth mass (#8) that was 11.5 mm wide with a large pulp chamber and two apices. The tooth mass was extracted and the left central incisor (#9) was successfully moved across the midline (through the midpalatal suture area). The supernumerary incisor (#9a) was then used in the upper left central incisor area.
本报告描述了一位 7 岁 6 个月大的女孩的双期正畸治疗过程，她双侧中切牙发生了完全性双生牙。左侧完全双生牙，形成了两颗独立的牙齿（#9 和 #9a）。右侧不完全双生牙，形成了一个宽 11.5mm、牙髓腔大且有两个根尖的大牙块（#8）。牙块被拔除，左侧中切牙（#9）成功地移动到了中线（穿过了正中腭缝区）。然后，将额外的中切牙（#9a）用在上颌左侧中切牙区。
