Thakur Nidhi, Kumar Amish, Singh Pinky, Gopalakrishnan Dipti, Mishra Bibhu Prasad, Jha Mrigank Shekhar
Assistant Professor, Department Of Dentistry, Anugrah Narayan Magadh Medical College And Hospital, Gaya, Bihar, india, India.
PG Student, Department of Human Anatomy, Indira Gandhi Institute Of Medical Science, Patna, Bihar, India.
J Pharm Bioallied Sci. 2021 Nov;13(Suppl 2):S1394-S1397. doi: 10.4103/jpbs.jpbs_224_21. Epub 2021 Nov 10.
Anatomical variations of the mandibular canal play a vital role while performing surgical procedures affecting an area with mandibular canal course in the mandible. The neurovascular bundle may be severed during surgical procedures carried out mandible.
The present retrospective study was aimed to assess and evaluate the mandibular canal and its variations on the panoramic radiography.
The study included 88 randomly selected panoramic radiographs with complete mandible and associated bone. On a panoramic radiograph, the following parameters were assessed including bifid mandibular canal and location of bifurcation, the diameter of the mandibular canal as recorded in the first molar region, trabeculation in submandibular gland fossa, anterior loop measurement, direction and diameter of the bifid mandibular canal were all evaluated. Statistical analysis was done.
In 51 hemimandibles, the mandibular canal was found to be corticalized, whereas in 21.59% ( = 19), the mandibular canal was visible. In the remaining 20.45% ( = 18) of the study participants, the mandibular canal was not visualized. In the submandibular gland fossa region, diminished trabeculation was seen in 55.68% of the evaluated radiographs, whereas trabeculation was not seen at all in the remaining 23.86% of the subjects. A significant correlation was seen in decreased trabeculation of submandibular gland fossa and absence of the mandibular canal ( value < 0.001). The bifid mandibular canal was seen in 19.31% of the study participants ( = 17) with a mean width of 3.12 ± 1.1 mm. Extension of the anterior loop of the mental nerve was seen as up to 2 mm in majority participants in 67.04% individuals ( = 59).
The present study suggests that panoramic radiographs are a reliable tool for assessment of the mandibular canal and associated anatomical variations associated with it.
下颌管的解剖变异在进行涉及下颌骨中下 颌管走行区域的外科手术时起着至关重要的作用。在进行下颌骨手术过程中，神经血管束可能会被切断。
本回顾性研究旨在评估全景 X 线片上下颌管及其变异情况。
本研究纳入 88 张随机选取的包含完整下颌骨及相关骨质的全景 X 线片。在全景 X 线片上，评估以下参数，包括下颌管双分支及分支位置、第一磨牙区记录的下颌管直径、下颌下腺窝内的骨小梁、前襻测量、下颌管双分支的方向和直径。进行了统计学分析。
在 51 侧半下颌骨中，下颌管表现为皮质化，而在 21.59%（n = 19）的病例中，下颌管可见。在其余 20.45%（n = 18）的研究对象中，下颌管未显影。在下颌下腺窝区域，55.68%的评估 X 线片中可见骨小梁减少，而其余 23.86%的受试者完全未见骨小梁。下颌下腺窝骨小梁减少与下颌管未显影之间存在显著相关性（P 值<0.001）。19.31%的研究对象（n = 17）可见下颌管双分支，平均宽度为 3.12±1.1mm。67.04%（n = 59）的大多数参与者中，颏神经前襻延伸可达 2mm。
本研究表明，全景 X 线片是评估下颌管及其相关解剖变异的可靠工具。
