골격성 제III급 부정교합자의 LE FORT I 상악골 절단술후 교합평면의 안정성에 관한 연구

Stability of occusal plane after le fort I maxillary osteotomy in patients with skeletal class III malocclusion

Surgical alteration of occlusal plane in patients with dentofacial deformities is necessary to establish optimal functional and esthetic relationships. In the stability of occlusal plane, clockwise rotation of the maxillomandibular complex in double-jaw surgery is a well-accepted technique in orthognathic surgery, while counterclockwise rotation has not been supported as an acceptable treatment modality. But recently, Wolford et al. Reported the stability of occlusal plane after double-jaw surgery in patient who had an increase or decrease in occlusal plane angulation. And, he concluded that counterclockwise rotation of the maxillomandibular complex is a stable and predictable procedure. The object of this study is to retrospectively evaluate the stability of occlusal plane after Le Fort I maxillary osteotomy using miniplate fixation in patients with skeletal class Ⅲ malocclusion. In this study, eight patients were evalated with preoperative, immediate postoperative, and long-term postoperative lateral cephalometric radiographs. These serial cephalometric radiographs of patients with skeletal class Ⅲmalocclusion, who was selected among the patients performed double-jaw surgery, had superimposed with cephalometric error of SN plane within 1mm. In conclusion, average long-term follow-up changes of occlusal plane angle were -0.9°(1.3° with FH plane and 0.0°(1.2° with SN plane. These results demonstrated that occlusal plane after Le Fort I maxillary osteotomy in patients with skeletal class Ⅲ malocclusion was stable.