Joshi M R
Orthodontics Department, Government Dental College and Hospital, Ahmedabad, India.
Angle Orthod. 2001 Feb;71(1):12-22. doi: 10.1043/0003-3219(2001)071<0012:TMCARO>2.0.CO;2.
The transmigrant mandibular canine is a rare phenomenon. Most authors have described singular cases of unilateral or bilateral occurrence; however, a few authors have published more cases. This paper describes 28 cases exhibiting transmigratory canines. The observations are compared with observations from 39 earlier reports. Women are affected more than men. The left canine undergoes transmigration more commonly than does the right canine. Transmigration and impaction appear to be more common. Most of the patients do not have any symptoms, and these canines are often discovered at the radiological examination before orthodontic treatment. The etiology is obscure; however, abnormal displacement of the tooth bud in embryonic life is a commonly accepted explanation. Prolonged retention of the deciduous canine is a good clinical sign for a thorough radiological examination, preferably including an orthopantomographic radiograph. This would help in preventive measures. However, once established, a transmigrated canine requires surgical extraction. If possible, and if space is available and the patient is willing, all orthodontic efforts should be made to restore the normal position of this functionally very useful tooth in the human dentition.
移位下颌尖牙是一种罕见现象。大多数作者描述的是单侧或双侧发生的个别病例；然而，也有少数作者发表了更多病例。本文描述了28例表现为移位尖牙的病例。并将这些观察结果与之前39篇报告中的观察结果进行了比较。女性比男性更易受影响。左侧尖牙比右侧尖牙更常发生移位。移位和阻生似乎更为常见。大多数患者没有任何症状，这些尖牙常在正畸治疗前的影像学检查中被发现。病因尚不清楚；然而，胚胎期牙胚的异常移位是一个被广泛接受的解释。乳牙尖牙的长期滞留是进行全面影像学检查的良好临床指征，最好包括全景X线片。这将有助于采取预防措施。然而，一旦尖牙发生移位，就需要手术拔除。如果可能，并且有空间且患者愿意，应尽一切正畸努力将这颗在人类牙列中功能非常有用的牙齿恢复到正常位置。
