A study of the mandibular incisive nerve and possible causes of altered sensation following maxillofacial surgery (922.5)

Abstract

The mandibular interforaminal region is considered a safe zone for cortical bone graft harvesting. Incidence of sensory disturbance of the anterior dentition is reported following harvest at the mandibular symphysis. Anatomical understanding of the incisive nerve within the bony mandible is required to prevent nerve injury. Our study of the anatomy of the incisive nerve, its variation, and position within the mandible will provide a comprehensive map for surgeons. Thirty‐eight cadaveric mandibles will be dissected to reveal the incisive nerve within the mandibular symphysis. The nerve formation will be categorized as: Type A (trunk with branches to anterior teeth), B (a disorganized plexus), or C (nearby nerve contribution). Categorical prevalence will be compared in dentate and edentulous mandibles. A subset of mandibles will be sagittally sectioned between the mental foramina to show the incisive nerve relative to the inferior border of the mandible. Preliminary results of 11 dissected dentate mandibles reveal a prevalence of the ‘Type A’ formation between the mental foramina (8/11). Two dentate mandibles have shown ‘Type B’ formation. Dissected edentulous mandibles reveal a prevalence of ‘Type A’ formation (3/3). Elucidation of anatomical formation, variation, and position of the incisive nerve will help decrease the morbidity of incisive nerve damage and provide a better long‐term outcome for patients.