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目的:研究经Frankel Ⅲ型矫治器矫治1年后的青少年面部硬组织变化。方法:选取安氏Ⅲ类错患者25例,在生长快速期使用Frankel Ⅲ型矫治器矫治1年,于治疗前后拍摄X线头颅侧位片,另收集128例同龄安氏Ⅲ类错患者的X线头颅侧位片资料作为对照组,进行头影测量分析。结果:经过Frankel Ⅲ型矫治器治疗1年,患者下颌骨长度发育受到抑制,减小后面高的增长,ANB角增加,SNB角减小,下颌相对于颅底的位置向后移动;下颌平面及平面发生顺时针方向的旋转。结论:经Frankel Ⅲ型矫治器矫治1年,下颌生长会受到抑制,向后下方旋转生长。
Objective: To study the changes of adolescent facial hard tissue after Frankel Ⅲ appliance correction 1 year. Methods: Twenty-five patients with Class III malocclusion were selected and treated with Frankel type III appliance for 1 year in fast-growing period. X-ray cephalograms were collected before and after treatment. Another 128 patients with malocclusion of Class III were collected X-ray cephalometric data as a control group, cephalometric analysis. Results: After a year of treatment with Frankel Ⅲ appliance, the mandibular length of the patient was inhibited and the height of the lower jaw increased. The ANB angle increased, the SNB angle decreased, and the position of the mandible moved backwards relative to the skull base. The mandibular plane and The plane rotates clockwise. Conclusion: After correction of Frankel type Ⅲ appliance for 1 year, the growth of mandible will be inhibited and the growth will be rotated backwards and downwards.