Morphological features of the mandible as predictors for neurosensory disturbances after bilateral sagittal split osteotomy.
This retrospective study aimed to identify anatomical predictors of neurosensory disturbance (NSD) after bilateral sagittal split ramus osteotomy (BSSO) by evaluating the morphology of the mandible on lateral cephalograms (LCs) and orthopantomograms (OPTs). The LCs and OPTs of 142 patients who underwent BSSO were reviewed. The influence of the mandibular angle was assessed on LCs, while the following morphological landmarks and subsequent measurements were analysed on OPTs: vertical and horizontal positions of the lingula, ramus width, mandibular body height, mandibular canal position and mandibular angle length. Post-operative NSD (hypoaesthesia) was considered permanent when objective tests or subjective evaluations indicated altered sensation one year after BSSO. Generalised linear mixed models were used to take into account the repeated measurement design (left and right measurements within one patient). Hypoaesthesia was present in 10.6% of the patients (5.6% of sites). After adjusting for age, a small mandibular body height was found to significantly increase the risk of hypoaesthesia. The other measurements showed no significant association with hypoaesthesia. These findings show a relationship between mandibular morphology and hypoaesthesia after BSSO and can aid surgeons in pre-operative assessments of the risk of NSD. Further research is needed to identify risk factors for NSD based on mandibular morphology.
['Verweij|Jop P|JP|', 'Mensink|Gertjan|G|', 'Fiocco|Marta|M|', 'van Merkesteyn|J P Richard|JP|']
D000293:Adolescent D000328:Adult D000367:Age Factors D005260:Female D006801:Humans D006987:Hypesthesia D008297:Male D008334:Mandible D008875:Middle Aged D059229:Osteotomy, Sagittal Split Ramus D011183:Postoperative Complications D011862:Radiography, Panoramic D012189:Retrospective Studies D012307:Risk Factors D055815:Young Adult
Sagittal split osteotomy Orthopantomogram Hypoaesthesia Mandibular morphology Inferior alveolar nerve Orthognathic surgery