Zhou Yan, Huang Min-fang, Fang Zhi-xin, Chen Shi-wen, Ou Xiao-li
Department of Orthodontics, People's Hospital of Guangxi Zhuang Autonomous Region, Nanning 530021, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2008 Aug;43(8):472-5.
To evaluate the effects and mechanisms of the microscrew implant anchorage (MIA) combined with multi-loop edgewise arch wire (MEAW) technique in the treatment of skeletal Class II adult patients.
Eleven adult patients with skeletal Class II high-angle malocclusions were treated with fixed appliances. The spaces were closed by the springs from the MIA to the hook on the archwire. The height of the hook and the direction of the force were different according to the intrusion and retraction of upper anterior teeth. In the finishing stage, MEAW technique and modified class II elastics (from the first loop of MEAW to the MIA) were used for final detailing. Cephalometric analysis was used to evaluate the effect after treatment.
After treatment, the decrease of SNA, ANB and FMA were (2.86 +/- 1.05) degrees , (2.82 +/- 0.96) degrees and (2.95 +/- 1.35) degrees , respectively. The torque control of upper anterior teeth was good. The protrusion of lower incisors and the molar extrusion were avoided. The upper molars were moved distally by (3.00 +/- 2.19) mm.
The treatment of adult patients with skeletal Class II high angle malocclusions with MIA and MEAW technique could not only improve the facial esthetics but also avoided the common side effects of traditional Class II elastics.
评估微螺钉种植支抗（MIA）联合多曲方丝弓（MEAW）技术治疗成年骨性II类患者的疗效及机制。
11例成年骨性II类高角错牙合患者采用固定矫治器治疗。通过从MIA到弓丝上挂钩的弹簧关闭间隙。根据上前牙的压低和内收情况，挂钩的高度和力的方向有所不同。在矫治后期，采用MEAW技术和改良II类牵引（从MEAW的第一曲到MIA）进行最终精细调整。采用头影测量分析评估治疗后的效果。
治疗后，SNA、ANB和FMA分别降低（2.86±1.05）°、（2.82±0.96）°和（2.95±1.35）°。上前牙的转矩控制良好。避免了下切牙前突和磨牙伸长。上磨牙远中移动（3.00±2.19）mm。
采用MIA和MEAW技术治疗成年骨性II类高角错牙合患者，不仅可以改善面部美观，还能避免传统II类牵引常见的副作用。
