Research assistant, Department of Orthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
Am J Orthod Dentofacial Orthop. 2012 Aug;142(2):e1-7. doi: 10.1016/j.ajodo.2012.02.026.
The aim of this study was to present the orthodontic treatment of a 15-year-old boy with a unilateral maxillary molar distalization system, called the zygoma-gear appliance. It consisted of a zygomatic anchorage miniplate, an inner bow, and a Sentalloy closed coil spring (GAC International, Bohemia, NY). A distalizing force of 350 g was used during the distalization period. The unilateral Class II malocclusion was corrected in 5 months with the zygoma-gear appliance. The maxillary left first molar showed distalization of 4 mm with an inclination of 3°. The maxillary premolars moved distally with the help of the transseptal fibers. In addition, there were slight decreases in overjet (-0.5 mm) and maxillary incisor inclination (-1°), indicating no anchorage loss from the zygoma-gear appliance. Preadjusted fixed appliances (0.022 × 0.028-in, MBT system; 3M Unitek, Monrovia, Calif) were placed in both arches to achieve leveling and alignment. After 14 months of unilateral distalization with the zygoma-gear appliance and fixed appliances, Class I molar and canine relationships were established with satisfactory interdigitation of the posterior teeth. Acceptable overjet and overbite were also achieved. This article shows that this new system, the zygoma-gear appliance, can be used for unilateral maxillary molar distalization without anchorage loss.
本研究旨在介绍一种名为颧骨齿轮矫治器的单侧上颌磨牙远移系统的正畸治疗。该系统由颧骨锚固微型板、内弓和 Sentalloy 封闭线圈弹簧（GAC International，Bohemia，NY）组成。远移期间使用 350g 的远移力。在 5 个月内，使用颧骨齿轮矫治器纠正了单侧 II 类错颌。上颌左侧第一磨牙远移了 4mm，倾斜了 3°。上颌前磨牙在鼻中隔纤维的帮助下远移。此外，覆盖减少了 0.5mm，上颌切牙倾斜减少了 1°，表明颧骨齿轮矫治器没有丧失支抗。在双侧弓上放置预调整的固定矫治器（0.022×0.028 英寸，MBT 系统；3M Unitek，Monrovia，Calif）以实现排齐和整平。在使用颧骨齿轮矫治器和固定矫治器进行单侧远移 14 个月后，建立了 I 类磨牙和尖牙关系，后牙有满意的交错。也获得了可接受的覆合和覆盖。本文表明，这种新的系统颧骨齿轮矫治器可用于单侧上颌磨牙远移而不会丧失支抗。
