Tarsariya Vivek Muljibhai, Jayam Cheranjeevi, Parmar Yuvaraj Suryakant, Bandlapalli Anila
Department of Oral Medicine & Radiology, College of Dental Science & Research Center, Ahmedabad, Gujarat, India.
Department of Paediatric Dentistry, College of Dental Science & Research Center, Ahmedabad, Gujarat, India.
BMJ Case Rep. 2015 Sep 11;2015:bcr2014205398. doi: 10.1136/bcr-2014-205398.
Intrabony cross arch migration (transmigration) of impacted teeth is a very rare dental anomaly. Transmigration is commonly seen in permanent dentition of the lower jaw. The tooth most commonly involved is the mandibular canine. The prevalence of transmigrated canine has been found to be only 0.14-0.31%. Transmigration of the canine most frequently occurs in a mesial direction resulting in migration across the mandibular symphysis to the opposite side of the dental arch. We report a case series (4 cases) of rare transmigration of mandibular canines and emphasise the need to use panoramic radiography in cases presenting with either over retained deciduous canines and/or missing permanent canines. We also propose a newer modification to the present classification of transmigration for one of these cases as the present classification does not include all the entities.
阻生牙的骨内跨牙弓移位（异位萌出）是一种非常罕见的牙齿异常情况。异位萌出常见于下颌恒牙列。最常受累的牙齿是下颌尖牙。已发现异位萌出尖牙的患病率仅为0.14 - 0.31%。尖牙的异位萌出最常发生在近中方向，导致其穿过下颌联合向牙弓的另一侧移位。我们报告了一组罕见的下颌尖牙异位萌出病例系列（4例），并强调在出现乳牙尖牙滞留和/或恒牙尖牙缺失的病例中使用全景X线摄影的必要性。对于其中1例病例，我们还对目前的异位萌出分类提出了一种新的改进，因为目前的分类并未涵盖所有情况。
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