Ding Xue-fang, Zhou Yan-heng, Gao Xue-mei
Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2007 Feb;42(2):80-4.
To investigate the imtrusion of overerupted molars with microscrews as anchorage.
Thirteen adult patients were treated with microscrew anchorage and fixed appliances. Twenty-three overerupted posterior maxillary teeth were intruded. The intrusive movement was investigated on cephalometric radiographs.
The molars were intruded and the occlusal plane was corrected successfully in all patients. The treatment period of intrusion was from 5 to 18 months (mean 10.4 months). Significant true intrusion of overerupted maxillary molars, ranged from 0.45 mm to 7.00 mm [mean (2.86 +/- 1.80) mm], was achieved (P < 0.001). The apical root resorption was not clinically significant and the bone level was unchanged.
The microscrew anchorage and fixed appliances were applicable and efficacious for intrusion of overerupted maxillary molars.
探讨使用微螺钉作为支抗压低过长磨牙。
对13例成年患者采用微螺钉支抗和固定矫治器进行治疗。压低23颗上颌后牙过长牙。通过头影测量X线片研究压低移动情况。
所有患者磨牙均被压低，咬合平面成功矫正。压低治疗时间为5至18个月（平均10.4个月）。过长上颌磨牙实现了显著的真性压低，压低范围为0.45毫米至7.00毫米[平均(2.86±1.80)毫米]（P<0.001）。根尖吸收在临床上不显著，骨水平未改变。
微螺钉支抗和固定矫治器适用于压低过长上颌磨牙且疗效显著。
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