可摘矫治器是比较适合我国国情,目前使用最广的矫治器。本文介绍一种可摘矫治器固位体——改良式单箭头卡环,经1986年—1991年对临床200例正畸患者使用,改良式单箭头卡环具有固位良好,并可利用卡环上的拉钩挂皮圈牵引牙齿;简易适用,效果良好。值得临床上推广使用。改良式单箭头卡环的组成及作用:改良式单箭头卡环由拉钧、箭头、卡臂和连接体四部分组成(附图)。箭头卡抱住基牙的近(远) Disposable appliance is more suitable for China's national conditions, the most widely used appliance. This article describes a removable appliance retainer - improved single arrow snap ring, from 1986 to 1991, the clinical use of 200 cases of orthodontic patients, modified single arrow snap ring with good retention, and can use the card Pull the ring on the ring to hold the leather ring traction teeth; simple and effective, good effect. It is worth to promote clinical use. Modified single-arrow snap ring composition and role: Modified single-arrow snap ring by pull Jun, arrows, arm and connector body composed of four parts (with photos). Arrow card hold abutment near (far)