上颌磨牙远移的 Zygoma-Gear 矫治器的作用。
Effects of maxillary molar distalization with Zygoma-Gear Appliance.
机构信息
Department of Orthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
出版信息
Angle Orthod. 2012 Jul;82(4):596-602. doi: 10.2319/091611-595.1. Epub 2011 Dec 8.
OBJECTIVE
To evaluate the dentoalveolar, skeletal, and soft tissue effects of the Zygoma-Gear Appliance (ZGA) when used for bilateral distalization of the maxillary molars.
MATERIALS AND METHODS
The study group included 15 patients (mean age, 15.87 ± 1.09 years; range: 14-18 years) treated with the ZGA system supported with zygomatic anchorage miniplates. The changes due to the distalization were evaluated from the lateral cephalometric films taken before and after distalization by means of a paired t-test.
RESULTS
The mean treatment period required to achieve a Class I molar relationship was 5.21 months. The distalization amount of the maxillary molars was 4.37 ± 2.15 mm (P < .001), and, thus, the rate for the distal movement of the molars was 0.84 mm per month. Maxillary first molars showed a slight intrusion (0.50 mm) (P > .05), while distal tipping was only 3.30° ± 2.31° (P > .05). Furthermore, there was a decrease in overjet (-0.50 mm) (P > .05), indicating that there was no anchorage loss with use of the ZGA.
CONCLUSIONS
Maxillary molar distalization without anchorage loss can be achieved in a short time with ZGA.
目的
评估 Zygoma-Gear 矫治器（ZGA）用于上颌磨牙双侧远移时的牙牙槽、骨骼和软组织效果。
材料与方法
研究组包括 15 名患者（平均年龄 15.87±1.09 岁；范围：14-18 岁），采用 ZGA 系统联合颧骨锚固微型板进行治疗。通过配对 t 检验，从远移前和远移后的侧位头颅侧位片评估远移引起的变化。
结果
达到 I 类磨牙关系所需的平均治疗时间为 5.21 个月。上颌磨牙的远移量为 4.37±2.15mm（P<.001），因此，磨牙的远移速度为每月 0.84mm。上颌第一磨牙有轻微的内倾（0.50mm）（P>.05），而远倾倾仅为 3.30°±2.31°（P>.05）。此外，覆颌减少（-0.50mm）（P>.05），表明使用 ZGA 没有支抗丧失。
结论
ZGA 可在短时间内实现上颌磨牙无支抗丧失的远移。
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