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Neurosensory function of the inferior alveolar nerve after bilateral sagittal ramus osteotomy: a retrospective study of 68 patients.

Journal article
Authors S Nesari
Karl-Erik Kahnberg
Lars Rasmusson
Published in International journal of oral and maxillofacial surgery
Volume 34
Issue 5
Pages 495-8
ISSN 0901-5027
Publication year 2005
Published at Institute of Odontology
Pages 495-8
Language en
Keywords Adolescent, Adult, Age Factors, Bone Plates, adverse effects, Bone Screws, adverse effects, Bone Wires, adverse effects, Chin, innervation, Female, Follow-Up Studies, Humans, Lip, innervation, Male, Mandible, innervation, surgery, Mandibular Nerve, pathology, physiopathology, Middle Aged, Osteotomy, adverse effects, methods, Recovery of Function, physiology, Retrospective Studies, Sensation Disorders, etiology, Treatment Outcome
Subject categories Surgical research


The aim of the present study was to report the incidence of neurosensory dysfunction in the lower lip and chin after bilateral sagittal split osteotomy at four postoperative time points, and the relation of impairment to factors connected with the operation. Sixty-eight patients who had undergone the procedure (at 136 operated sites) were reviewed, and neurosensory recovery was studied at 2, 6, 18 and finally 30 months postoperatively. A change in neurosensory recovery was seen over this period of time. Two months postoperatively, 84 sites had reduced sensitivity (62%). The incidence of disorder decreased to 52 sites (38%) at 6 months, 43 sites (32%) at 1.5 years and 32 sites (24%) at the final 2.5-year check up. The patient age at the time of surgery, the type of osteosynthesis and the perioperative position of the inferior alveolar nerve were variables that influenced the neurosensory outcome. In conclusion, this retrospective study shows that the most important factors influencing postoperative nerve function are patient age, fixation method and the perioperative position of the inferior alveolar nerve.

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