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Study of Late Sensory Paralysis in the Lower Lip after Sagittal Split Osteotomy
-- Part 1: Investigation of Factors on Multivariate Analysis --
Masataka Kaji, Yasushi Ohashi, Yuuichi Mutoh, Minoru Yagi*
Second Department of Oral and Maxillofacial Surgery, Niigata University, School of Dentistry
(Chief: Prof. Yasushi Ohashi)
*Department of Preventive Dentistry, Niigata University, School of Dentistry
(Chief: Prof. Hideo Miyazaki)
Abstract
There is a high incidence of late sensory paralysis of the lower lip after sagittal split osteotomy and it has been recognized as a serious complication. The purpose of this study was to identify factors that influence the occurrence of late sensory paralysis. The relationships between selected factors (age, location of the mandibular canal on frontal cephalograms, operating time, method of splitting, amount of setback, method of fixation and experience of the surgeon) and sensory paralysis one year postoperatively was investigated on 150 sides (75 patients) after bilateral sagittal split osteotomy. The statistical evaluation was performed by univariate and multivariate analysis. The results were as follows; The incidence of late sensory paralysis was 22.6%DThere was a statistical difference in the incidence of paralysis based on the location of the mandibular canal (P < 0.001). The other factors were not significant. On multivariate analysis using a logistic regression model, only the location of the mandibular canal was correlated with sensory paralysis (95% confidence interval 0.80 - 0.93, P=0.0001).