ABSTRACT
Objective To explore the clinical method and effect of ultrasonic osteotomy in mandibular angle reduction.Methods Under intronasal approach and general anesthesia,30 patients (5 male patients and 25 female patients) underwent intraoral prominent mandibular angle reductions with ultrasonic osteotomy.The jaw bone under periosteum was explored and the mental nerves protected.According to the clinical features of mandibular angle,curved mandibular angle osteotomy,mandible margin osteotomy or outer cotex splitting osteotomy were performed.Results All the osteotomy of prominent mandibular angle reductions could be completed with ultrasonic osteotomy.There were no complications of bleeding,nerve injury and malfracture happened.After 1 year following-up,the outlines of lower mandible were natural and concordant.Compared with traditional osteotomy devices,ultrasonic osteotomy was smoother and more precisely.Conclusions Ultrasonic osteotomy can improve the precise and safty of mandibular angle reduction.but compared with traditional osteotomy devices,it takes more time for osteotomy procedure.Surgeons need adapt to the different feeling and control methods.