Neurosensory Recovery Of The Inferior Alveolar Nerve After Bilateral Sagittal Split Osteotomy

ABSTRACT

inferior alveolar nerve was indicated by various degree of numbness on the lower lip. The chin is considered as one of the few drawbacks of mandibular osteotomy,especially bilateral sagittal split ramus osteotomy (BSSRO)and genioplasty. In this study,53 consecutive patients under class III malocclusion impression who were taken with BSSRO only 30 cases and BSSRO with genioplasty 23 cases were carried out inferior alveolar nerve dysfunction test according to time at 1, 2, 4, 8 weeks and 6 months,l year postoperatively.The tinnel sign was checked by patient 's self-evaluation.20 members without trauma and nerve damage history,as control group nerve test was taken. Majority of patients returned to normal sensation during post operative 6 months.Although immediate nerve deficit were 82.86%, 74.29%, 75%,these were recovered to 16.22%, 21.62%, 13.51%at 6 months and 0%, 3.12%, 3.12% at 1 year.Nerve recovery tendency increased predominantly between post-op 4 weeks and 6 months.There was no statistically difference neurosensory deficit among the chin area. Neurosensory deficit was more severe when the BSSRO with genioplasty group than the BSSRO only group at post-op. But 1 year later,the differences between two groups was no significant. There was no significant difference between left side and right side in neurosensory disturbance.Static light touch was more sensitive method of neurosensory deficit than two point discrimination and pin pressure nociception.Tinnel sign was almost appeared at between 1 week and 3 weeks after operation.