Bondemark L
Department of Orthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
Eur J Orthod. 2000 Dec;22(6):683-95. doi: 10.1093/ejo/22.6.683.
The aim of the study was to evaluate cephalometrically the dental and skeletal treatment effects of a new lingual intra-arch Ni-Ti coil appliance for molar distalization and to compare these with those of an established intra-arch appliance that uses repelling magnets for distal molar movement. Two groups of 21 adolescents, all girls, participated in this retrospective study. One group was treated with the new lingual Ni-Ti coil appliance for 6.5 months and the other with the magnetic appliance for 5.8 months. The treatment effects were analysed by measurements on lateral head radiographs at the start of treatment and after the molar distalization was completed. The mean amount of distal molar movement was 2.5 mm (SD 0.69) in the lingual coil group and 2.6 mm (SD 0.51) in the magnet group. A significantly higher degree of distal molar tipping was found in the magnet group, -8.8 degrees, compared with -2.2 degrees for the lingual coil group. Due to anchorage loss, the maxillary incisors moved forwards, and the overjet was increased by an average of 1.2 mm in the lingual coil group and 1.7 mm in the magnet group. The results indicate that the new lingual Ni-Ti coil appliance was better choice than the magnet appliance for distal bodily movement of maxillary molars. The benefits of the new Ni-Ti appliance were due to the design preventing molar tipping and its single activation.
本研究的目的是通过头影测量法评估一种用于磨牙远移的新型舌侧牙弓内镍钛螺旋弹簧矫治器的牙齿和骨骼治疗效果，并将其与一种使用排斥磁体进行磨牙远移的成熟牙弓内矫治器的效果进行比较。两组各有21名青少年女性参与了这项回顾性研究。一组使用新型舌侧镍钛螺旋弹簧矫治器治疗6.5个月，另一组使用磁体矫治器治疗5.8个月。通过在治疗开始时和磨牙远移完成后对头颅侧位片进行测量来分析治疗效果。舌侧螺旋弹簧组磨牙远移的平均量为2.5mm（标准差0.69），磁体组为2.6mm（标准差0.51）。发现磁体组磨牙远中倾斜度显著更高，为-8.8度，而舌侧螺旋弹簧组为-2.2度。由于支抗丧失，上颌切牙向前移动，舌侧螺旋弹簧组覆盖平均增加1.2mm，磁体组增加1.7mm。结果表明，对于上颌磨牙的整体远移，新型舌侧镍钛螺旋弹簧矫治器比磁体矫治器是更好的选择。新型镍钛矫治器的优势在于其设计可防止磨牙倾斜及其单次激活。
