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Third Molar Injuries of the Trigeminal Nerve

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Trigeminal Nerve Injuries

Abstract

Third molar extraction is one of the most common procedures performed in oral surgery. Among the possible complications, damage to the neighboring branches of the trigeminal nerve is a most dreaded complication. Although it is transient in most cases, it can leave permanent sequelae, such as hypoesthesia or dysesthesia, with a great impact on the patient’s quality of life. In the lower third molar area, the lingual nerve (LN) usually lies under the mucosa overlying the lingual cortical plate. Surgical trauma to the LN during extraction of the lower third molar is caused by inadequate handling of either the lingual cortical plate or the mucosa on the lingual aspect of the wound. Preventive measures to avoid LN injury include (1) a buccal approach without elevating or separating a lingual flap and (2) caution when removing bone or sectioning the tooth, not to perforate the lingual cortical plate. Damage to the inferior alveolar nerve (IAN) is generally related to an anatomical proximity between the third molar roots and the mandibular canal. This close relationship can be suspected using orthopantomography or intraoral radiographs but only confirmed with computed tomography (CT). Surgical techniques that reduce excessive forces or prevent nerve impingement during lower third molar extraction and postoperative care that minimizes edema are the keys to avoiding long-term IAN injury.

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Valmaseda-Castellón, E., Gay-Escoda, C. (2013). Third Molar Injuries of the Trigeminal Nerve. In: Miloro, M. (eds) Trigeminal Nerve Injuries. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35539-4_5

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