本文报道对于骨性Ⅲ类开(牙合)采用不拔牙、非手术的正畸矫治机理。具体方法是使用Tip Edge托槽用轻牵引力竖直下牙,前牙区使用Ⅲ类牵引,该Ⅲ类牵引可以防止上颌磨牙的伸长,并使上颌牙列前移,用呈反Spee曲线的Ni-Ti弓丝竖直并压低下颌磨牙。本病例运用Kim的基本理论,使用Tip Edge托槽,这样的结合简化了操作,能在较短时间内获得满意的疗效。 This article reports the use of non-extraction and non-surgical orthodontic treatment for skeletal class Ⅲ open occlusion. The specific method is to use Tip Edge bracket with light traction vertical lower teeth, anterior teeth area using Class III traction, the Class III traction can prevent the maxillary molar elongation, and the maxillary dentition forward, with anti-Spee curve Ni-Ti arch wire vertical and lower mandibular molar. The use of Kim's basic theory in this case, using the Tip Edge brackets, simplifies operation and results in a shorter period of time.