Anatomy of successful inferior alveolar nerve block
Journal of The Anatomical Society of India(2018)
摘要
The Mandibular Foramen (MF) is an opening on the internal surface of ramus of mandible leading into mandibular canal (MC). The Inferior alveolar vessels & nerves enter through the mandibular foramen, pass through mandibular canal , give branches to all mandibular teeth and exit through mental foramen(MeF) as mental vessels and nerves. The position of MF is an important anatomical landmark for effective anaesthesia in Dentistry by Inferior Alveolar Nerve Block (IANB) for many surgical procedures like lower jaw dental extraction, reduction of mandibular fractures as well as placing mandibular implants . The accomplishment of successful anaesthesia in IANB depends on the proximity of the needle tip to the MF at the time of injection of local anaesthetic agent. Aim of our study is to examine and evaluate the position of MF relative to four (4) bony landmarks in 100 dry samples of adult dentulous human mandibles. Materials and Methods : Dry human Mandibles were obtained from Department of Anatomy, Medical College, Kolkata (India).Parameters were measured by digital vernier callipers. The data was tabulated and statistically analysed. Results: The mean distance between the Mandibular Foramen (MF) and the respective landmarks were noted as (17.06±2.567) mm , (9.75±1.68) mm. (22.71±3.41) mm.and ( 13.58±2.116 ) mm.for the anterior, posterior, inferior and superior border ( mandibular notch) respectively for the right side. Likewise distances on the left sides were—(17.17±1.647)mm, (9.80±1.546) mm, (22.635±3.53) mm. And (13.52±2.026) mm. for the anterior, posterior, inferior and superior border ( mandibular notch) respectively. Statistically, there was no significant difference in the distance between mandibular foramen and respective four landmarks of both the sides. Conclusion : Our study revealed almost bilateral symmetry for all the landmarks taken under consideration. We conclude that the failures in the anaesthesia of Inferior alveolar nerve are mainly due to operator’s error and not due to anatomical variations. Though the knowledge of minor anatomical variations definitely will help the dental surgeons during local anaesthesia involving IANB for Orthodontic procedures.
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关键词
inferior alveolar nerve
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