Đánh giá sự ổn định sau phẫu thuật xoay phức hợp hàm trên - hàm dưới cùng chiều kim đồng hồ

Abstract

Objective: To assess the bone stability after Le Fort I osteotomy with clockwise rotation and longitudinal osteotomy of ramus of mandible in the treatment of Class III jaw deviation. Subject and method: The sample included of 34 Vietnamese patients with Class III jaw deviation were performed by Le Fort I osteotomy with clockwise rotation and longitudinal osteotomy of ramus of mandible. Lateral radiograph was taken preoperatively (T1), postoperatively (T2) and average 12 months post-procedure (T3). Horizontal and vertical correlation of anatomical landmarks in the maxilla, mandible to reference plan and the changes of soft tissue were assessed. Result: During T2-T1, there was a moving anteriosuperiorly in the posterior part (PNS, UMD); moving anteriorly and subside in anterior part (ANS, point A, UIE) of maxilla. During T3-T2, there was a recurrence reversely clockwise in maxilla. Posterior part stayed stable, especially vertically. Anterior part tended to move backwards and upwards. The anatomical landmarks in mandible showed the horizontally anterior recurrence and vertically superior recurrence. Following the changes in bone, soft tissue of lateral maxillary division that rotates clockwise. Conclusion: Le Fort I osteotomy procedure with clockwise rotation in the surgical treatment of Class III jaw deviation gains stable results, especially in the rear landmarks of the maxilla), it could help increase the aesthetic effect  for Vietnamese people.