种植微螺钉支抗矫治下颌磨牙缺失患者的上牙前突伴拥挤

目的探讨微螺钉种植体作为支抗用于下颌磨牙缺失患者矫治上牙前突伴拥挤的临床效果。方法选择下颌单侧磨牙缺失、上牙前突伴拥挤的成年错!患者8例（年龄22~38岁），在每位患者下颌磨牙缺失侧的第二前磨牙远中11~13 mm颊侧牙槽嵴处各种植1枚纯钛微螺钉，并以栓道固位方式在微螺钉的龈上部分附着自制微螺钉牵引帽，利用微螺钉牵引帽依次牵引同侧的下颌前磨牙、尖牙、切牙向远中移位，并利用牵引帽上的牵引钩行颌间Ⅱ类牵引。结果采用种植微螺钉作为支抗的8例患者治疗后均达到较理想的效果，前牙覆盖覆!和后牙尖窝关系均正常。疗程最长者24个月，最短者15个月，平均20.8个月。结论微螺钉种植体支抗可以用于下颌磨牙缺失的上牙前突伴拥挤患者的矫治。

Treating Maxillary Dental Arch Crowding and Protrusion of the Patient with Mandibular Molars Missing by Implanting Miniscrew Anchorage

OBJECTIVE: To study the clinical effectiveness of implanting miniscrew serving as anchorage instead of molars in treating maxillary dental arch crowding and protrusive patients mandibular molars complete missing. METHODS: Eight adult patients aged from 22 to 38, whose maxillary dental arch were crowding and protrusion, with mandibular molars missing were chosed. At the missing side, a miniscrew was implanted on the buccal surface, 11-13 mm away from the distal end of the second premolar. After implanting, a self-made miniscrew traction cap was attached to its supergingival section by keyway retention. Premolars and anterior teeth were tracted in turn to distal end. Intermaxillary traction II was made necessarily on the traction cap. RESULTS: Successful results were acquired after treating together with normal overbite, overjet and right occlusion relation. It took 24 months in the longest course, 15 months in the shortest course and 20.8 months on average. CONCLUSION: The implanting miniscrew anchorages could be used in maxillary dental arch crowding and protrusive patients with single molars complete missing.