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目的:观察快速扩弓联合前方牵引矫治恒牙期骨性Ⅲ类错的矫治效果,并探讨其矫治机制。方法:15例恒牙期骨性Ⅲ类错患者,应用快速扩弓联合前方牵引矫治器进行矫治,矫治前后拍摄头颅侧位定位片,并对矫治前后的X线头影测量进行比较分析。结果:矫治后面型改善明显、前牙反得到纠正、磨牙及尖牙关系中性、咬合关系良好。SNA角平均增大4.23°,SNB角无明显变化,覆盖平均增加5.52mm。结论:快速扩弓联合前方前牵引矫治器,可快速促进上颌骨向前发育,是纠正恒牙期骨性Ⅲ类前牙反的有效手段。
OBJECTIVE: To observe the effect of rapid protraction combined with anteroposterior traction in the treatment of permanent dentition skeletal Class Ⅲ malocclusion, and to explore its correction mechanism. Methods: Fifteen patients with permanent skeletal class Ⅲ malocclusion were treated with rapid protraction combined with anterior traction appliance. The cephalometric images were taken before and after treatment. The results of X - ray cephalometry before and after treatment were compared and analyzed. Results: The correction of the back type was obvious, the anterior crossbite was corrected, the molars and canines were neutral, and the occlusion was good. The average SNA angle increased 4.23 °, SNB angle no significant change, covering an average increase of 5.52mm. Conclusion: The rapid expansion combined with anterior front traction appliance can rapidly promote the development of the maxilla and is an effective way to correct the bodyshort class Ⅲ anterior crossbite.