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用多种力系统可将上颌磨牙移向远中。本文作者使用相斥的磁体将上颌磨牙移向远中。方法是:在上颌两侧第一双尖牙安装固定改良的 Nance 装置,该装置的塑料部分通过焊在上颌第一双尖牙带环舌侧的金属丝(0.045″)向前延伸至切牙并与腭穹窿和切牙紧贴,在上颌第一双尖牙带环颊侧各焊一向远中延伸末端带有环圈的丝(0.045″),把相排斥的磁体固定在该丝上,置于上颌第一磨牙带环颊面管的近中.当磁体相接触时,产生排斥力,以 Nance 装置作支抗,第一磨牙被推向远中。作者解释说,把改良的 Nance 装置固定
With a variety of force system can move the maxillary molars. The authors use repulsive magnets to move the maxillary molars away. The method was to install and fix a modified Nance device on the first maxillary fossa on both sides and the plastic part of the device was extended forward by a wire (0.045 “) welded to the lingual side of the maxillary first bicuspid to the lingual incisors And close to the palatal vault and the incisor. Each end of the buccal side of the maxillary first bicuspid tendon has been extended with a loop of filaments (0.045 ”) distal to it, the phase-repelling magnet is secured to the filament, Placed in the maxillary first molar ring buccal tube near the middle.When the magnet contact, resulting in repulsion, with Nance device as the support, the first molar is pushed to the remote. The authors explain that the modified Nance device is fixed