Clinical effects of en-bloc U-shaped osteotomy of the mandible in prominent mandibular angle patients with long chin

Objective To discuss a surgical treatment to correct prominent mandibular angle with long chin. Methods From July 2015 to October 2017, 21 patients with malocclusion who suffered from prominent mandibular angle with long chin underwent en-bloc mandibular U-shaped osteotomy through oralincision in order to shorten mandibular angle, the body of mandible and the chin and to improve the facial contour. We assessed the surgical effect through comparison of radiologic images, satisfaction of patients and surgical complications between pre-operation and post-operation. Results In this group, all oral incisions had healing by first intention, without hematoma, infection and osteonecrosis. Low lip numbness occurred in 16 patients. After following up for 6-12 months, the lower lip numbness was recovered in 14 patients and relieved in 2 patients. All patients satisfied with the appearance after the operation. Conclusions En-bloc mandibular U-shaped osteotomy is an improvement for mandible surgery treatment. Its osteotomy line involves the whole mandible, which makes the length and width of mandible smaller apparently. This procedure can effectively correct prominent mandibular angle with long chin. Key words: Mandibular osteotomy; Hypertrophy; Maxillofacial abnormalities; Genioplasty; Cosmetic Techniques