Mupparapu M
University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania 19104, USA.
Dentomaxillofac Radiol. 2002 Nov;31(6):355-60. doi: 10.1038/sj.dmfr.4600732.
The purpose of this study is to (1). investigate the patterns of transmigration and eruption of permanent mandibular canines, plus the mechanisms affecting the eruption path, (2). classify the transmigration paths.
:A retrospective radiographic study using full mouth (FMX) and panoramic radiographs of dental radiology patients between July 1996 and July 2000. Transmigrated canines were identified from the radiographic records of 2150 new patients. The literature was reviewed regarding the individual patterns of canine transmigration and their final position within the mandible. A pattern classification was developed using literature data and the additional nine cases reported here.
In the present study, mandibular canines were found transmigrated on nine occasions and, in a further six cases, found impacted without transmigration. Out of the nine cases, seven were female (ages 17-38) and two were male (ages 20 and 69). One female patient had a bilateral transmigration of the mandibular canines. A total of 127 transmigrated canines were reported in 50 published studies from the literature. Transmigrated canines appear to fall into five patterns (Type 1-5) depending on their path of deviation. Type 1 was most common (45.6%) followed by Type 2 (20%), Type 4(17%), Type 3(14%) and Type 5 (1.5%).
Patterns of mandibular canine transmigration can be classified into five distinct patterns. The majority of cases demonstrated Type 1 transmigratory pattern. No clear aetiology of this disorder could be found.
本研究旨在（1）研究恒牙下颌尖牙的移位和萌出模式，以及影响萌出路径的机制，（2）对移位路径进行分类。
一项回顾性影像学研究，使用1996年7月至2000年7月期间牙科放射学患者的全口曲面断层片（FMX）和全景X线片。从2150名新患者的影像学记录中识别出移位的尖牙。回顾了关于尖牙移位的个体模式及其在下颌骨内最终位置的文献。利用文献数据和本文报道的另外9例病例建立了一种模式分类。
在本研究中，发现下颌尖牙有9次移位，另外6例为未移位的阻生。在这9例中，7例为女性（年龄17 - 38岁），2例为男性（年龄20岁和69岁）。1例女性患者双侧下颌尖牙移位。文献中50篇已发表的研究共报道了127颗移位尖牙。移位尖牙根据其偏离路径似乎可分为五种模式（1 - 5型）。1型最常见（45.6%），其次是2型（20%）、4型（17%）、3型（14%）和5型（1.5%）。
下颌尖牙移位模式可分为五种不同模式。大多数病例表现为1型移位模式。未发现该病症明确的病因。
