Utreja Ashok, Zahid Syed Naved, Gupta Richa
Unit of Orthodontics, Oral Health Sciences Centre, PGIMER, Chandigarh, India.
Contemp Clin Dent. 2011 Oct;2(4):385-9. doi: 10.4103/0976-237X.91810.
Solitary median maxillary central incisor (SMMCI) is a rare dental anomaly. It is estimated to occur in 1:50,000 live births. The SMMCI tooth differs from the normal central incisor in that the crown form is symmetric and it develops and erupts precisely in the midline of the maxillary dental arch in both primary and permanent dentitions. Presence of SMMCI with hemifacial microsomia (HFM) is a very rare clinical condition. We report a case of HFM in a male of Indian origin who presented with SMMCI in both primary and permanent dentitions. The association of HFM with SMMCI may be due to defective development of neural crest cells and/or lack of space in maxilla.
孤立性上颌中切牙(SMMCI)是一种罕见的牙齿异常。据估计,其在活产婴儿中的发生率为1:50000。SMMCI牙齿与正常中切牙的不同之处在于,其牙冠形态对称,并且在乳牙列和恒牙列中均精确地在上颌牙弓中线处发育和萌出。SMMCI与半侧颜面短小畸形(HFM)同时存在是一种非常罕见的临床情况。我们报告一例印度裔男性HFM病例,其乳牙列和恒牙列中均存在SMMCI。HFM与SMMCI的关联可能是由于神经嵴细胞发育缺陷和/或上颌骨空间不足所致。