Configuration and corticalization of the mandibular bifid canal in a Taiwanese adult population: a computed tomography study.
Configuration and corticalization of the mandibular bifid canal in a Taiwanese adult population: a computed tomography study.
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DOI：
10.11607/jomi.3435
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
E-Chin Shen;E. Fu;M. Fu;M. Peng
中科院分区：
文献类型：
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作者：
E-Chin Shen;E. Fu;M. Fu;M. Peng
目的 使用从 308 名台湾成年人身上获取的 170 颗半下颌骨的医学计算机断层扫描 (CT) 图像检查分叉下颌管的结构和皮质化程度。材料和方法 根据双裂管相对于升支、磨牙、前磨牙和颏孔的解剖位置来评估其结构；它们的路线（前/后或上/下）；是否与主下颌管汇合；以及是否存在穿过下颌骨形成副孔的情况。测量皮质化的根管长度的百分比。还对双歧管的两种不同分类进行了简要总结和比较。结果 当存在双歧管时（41.2%的患者；27.6%的半下颌骨），双歧管主要位于升支和磨牙后区域（67.7%），向前（95.9%）和向上（95.9%）延伸，不与主下颌管（91.1%）汇合。高达 16.5% 的双歧管在下颌骨皮质表面形成副孔。大约 78% 的双歧管在双歧管周围有不同程度的皮质化。结论利用CT图像对170例下颌双裂管的形态和走向进行了评估。双歧管主要位于升支和磨牙后区域；然而，32.4% 的双歧管位于可能种植牙的位置。大多数双歧管在下颌主管上方延伸，不与下颌主管重新汇合，并且在下颌体内减少。大约一半的双歧管（45%）完全皮质化。
PURPOSE The configuration and degree of corticalization of bifid mandibular canals were examined using medical computed tomography (CT) images from 170 hemimandibles obtained from 308 Taiwanese adults. MATERIALS AND METHODS The configurations of the bifid canals were assessed according to their anatomical position in relation to the ramus, molars, premolars, and mental foramen; their course (anterior/posterior or superior/inferior); the presence or absence of confluence with the main mandibular canal; and the presence or absence of penetration through the mandible to form an accessory foramen. The percentage of the canal length that was corticalized was measured. Two different classifications of bifid canals were also briefly summarized and compared. RESULTS When bifid canals are present (41.2% of patients; 27.6% of hemimandibles), the bifid canals were primarily located in the ramus and retromolar regions (67.7%) running anteriorly (95.9%) and superiorly (95.9%) without confluence with the main mandibular canal (91.1%). Up to 16.5% of bifid canals form accessory foramina on the cortical surface of the mandible. Approximately 78% of the bifid canals have varied degrees of corticalization around the bifid canals. CONCLUSION The configuration and course of 170 mandibular bifid canals were evaluated with CT images. The bifid canals were primarily located in the ramus and retromolar regions; however, 32.4% of the bifid canals were located in potential positions for dental implant placement. Most of the bifid canals ran anteriorly superior to the main mandibular canal, did not rejoin with the main mandibular canal, and diminished within the mandibular body. Approximately half of the bifid canals (45%) were completely corticated.