Volume : 7, Issue : 4, April - 2018

ANATOMY OF SUCCESSFUL INFERIOR ALVEOLAR NERVE BLOCK

Subhra Mandal, Arindam Samaddar, Prabir Mandal

Abstract :

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