Rouas P, Nancy J, Bar D
Department of Odontology and Buccal Health, University Victor Segalen Bordeaux 2, 16-20 cours de la Marne, 33082 Bordeaux Cedex, France.
Dentomaxillofac Radiol. 2007 Jan;36(1):34-8. doi: 10.1259/dmfr/27374727.
The aim of this study is to describe three rare cases of double mandibular canals identified using three-dimensional imaging techniques and to discuss how frequently this variation occurs.
A review of the current literature is presented and the study methods are discussed. Three hitherto unpublished cases of double mandibular canals are presented and described, two of them observed by CT scans and the third by cone beam CT (CBCT). They were identified from a pool of more than 6000 mandibular CT scans and CBCT images. These examinations were carried out in the context of pre-implant analyses in the mandible area.
Mandibular canals can be detected on panoramic radiographs. However, as confusion is possible when using two-dimensional images, it is only with tomographic imaging that some of these distinctive features can be identified. The case revealed by CBCT is the only one reported in the literature to date using this means of identification.
The presence of bifid mandibular canals is very rare, yet it is important to recognize this anatomical variation in any surgical procedures involving the lower jaw and its presence can only be confirmed by volumetric imaging.
本研究旨在描述三例使用三维成像技术发现的罕见双下颌管病例，并探讨这种变异的发生频率。
对当前文献进行综述并讨论研究方法。展示并描述三例此前未发表的双下颌管病例，其中两例通过CT扫描观察到，第三例通过锥形束CT（CBCT）观察到。这些病例是从6000多张下颌CT扫描和CBCT图像中识别出来的。这些检查是在下颌骨区域种植前分析的背景下进行的。
下颌管可在全景X线片上检测到。然而，由于使用二维图像时可能会出现混淆，只有通过断层成像才能识别其中一些独特特征。CBCT显示的病例是迄今为止文献中报道的唯一使用这种识别方法的病例。
双下颌管的存在非常罕见，但在涉及下颌骨的任何外科手术中识别这种解剖变异很重要，并且其存在只能通过容积成像来确认。
