青少年骨性前牙反牙合患者的矫治常需使用前方牵引促使上颌骨向前，限制下颌骨过度发育。在临床工作中，传统口内活动矫治装置常因固位差，易脱落而影响矫治效果。我们设计了双杠联冠牙合垫式矫治器，具有固位好、异物感小，无牙合干扰等优点，通过临床应用取得了良好效果。一? Orthodontics in orthodontics patients with orthopedic orthopedics often require the use of anterior traction to urge the maxilla forward and limit the over-development of the mandible. In clinical work, the traditional oral activity correction device often due to poor retention, easy to fall off and affect the treatment effect. We designed the parallel rod parallel rod pad appliance, with the advantages of good retention, small foreign body sensation, no occlusion and other advantages, achieved good results through clinical application. one?