开牙合是临床上难矫治易复发的一类错牙合畸形。大多数开牙合是由于后牙齿槽骨发育过度而非前牙萌出不足,传统的固定矫治伸长前牙容易而压低后牙困难,疗效较差反弹率高。多曲方丝弓(mu lt-loop edgew ise arch w ireIvIEAW)技术由美籍韩国正畸学家K im YH医师设计率先用于开牙 Open Clinically difficult to treat relapse prone to a class of malocclusion. The majority of occlusal occlusion is due to the overgrowth of the posterior tooth bone rather than the eruption of the anterior tooth. The traditional orthodontic treatment of the anterior tooth is easy and reduces the difficulty of posterior teeth, resulting in poor curative effect and high rebound rate. Mu lt-loop edgew ise archwire technology was first designed by Dr. Kim YH, a South Korean orthodontist