Bondemark L, Kurol J, Bernhold M
Orthodontic Clinic, Hässleholm, Sweden.
Angle Orthod. 1994;64(3):189-98. doi: 10.1043/0003-3219(1994)064<0189:RMVSNC>2.0.CO;2.
Eighteen subjects, aged 12.5 to 18.3 years, with Class II malocclusion, deep overbite and moderate space deficiency in the maxilla were treated orthodontically using repelling rare earth magnets on one side and superelastic nickel-titanium coils on the contralateral side for simultaneous distalization of maxillary first and second molars. The force values of the magnets and the coils were calibrated to 225g at the start of treatment and when reactivation was performed every fourth week. Tooth movement was analyzed by measuring dental casts, lateral photographs of dental casts, and lateral skull radiographs before and after 6 months of treatment. Mean distal molar movement was 3.2 mm for the supercoils and 2.2 mm for the magnets. Mean reduction of the overbite was 3.6 mm. Complaints of discomfort were more frequent for the magnet sides. The results indicate that superelastic coils are more effective than repelling rare earth magnets in molar distalization.
18名年龄在12.5至18.3岁之间、患有安氏II类错牙合、深覆牙合且上颌中度间隙不足的受试者接受了正畸治疗，一侧使用斥力稀土磁体，对侧使用超弹性镍钛线圈，以同时远移上颌第一和第二磨牙。在治疗开始时以及每四周进行重新激活时，将磁体和线圈的力值校准为225克。通过测量治疗6个月前后的石膏模型、石膏模型的侧面照片和头颅侧位X线片来分析牙齿移动情况。超弹性线圈使磨牙平均远移3.2毫米，磁体使磨牙平均远移2.2毫米。覆牙合平均降低3.6毫米。磁体侧的不适主诉更为频繁。结果表明，在磨牙远移方面，超弹性线圈比斥力稀土磁体更有效。
