Bahl Rashi, Singla Jeetinder, Gupta Mohita, Malhotra Ankit
Department of Oral and Maxillofacial Surgery, Genesis Institute of Dental Sciences and Research, Ferozepur, Punjab, India.
Contemp Clin Dent. 2013 Apr;4(2):217-9. doi: 10.4103/0976-237X.114850.
Pre-eruptive migration of a tooth across the midline is termed as transmigration. It is believed that transmigration is rare and unique to the mandibular permanent canines, and even more rarely reported for others. Transmigration is a phenomenon of yet unknown etiology. It follows the direction of its long axis, with the crown leading the migration. The tendency of a canine to cross the barrier of mandibular midline suture is a more important consideration than the distance of migration after crossing the midline. Here we present one new case of aberrantly positioned right mandibular canine which has undergone migration and was accidently found on radiological examination before orthodontic treatment. Once diagnosed an aberrantly positioned impacted canine requires surgical removal.
牙齿在萌出前越过中线的移动被称为异位萌出。人们认为异位萌出很少见，且仅见于下颌恒尖牙，其他牙齿的相关报道更为罕见。异位萌出是一种病因不明的现象。它沿着牙长轴方向移动，牙冠在前引导移动。尖牙越过下颌中线缝合屏障的倾向比越过中线后的移动距离更为重要。在此，我们报告一例新的右下颌尖牙异位萌出病例，该牙发生了移动，在正畸治疗前的影像学检查中意外发现。一旦诊断为异位萌出的阻生尖牙，就需要手术拔除。
