Objective To investigate the changes of soft and hard tissues after extraction space closure with micro-screw implant as orthodontic anchorage.
目的研究以微螺钉为支抗，用直丝弓矫治器滑动法关闭拔牙间隙后的软硬组织变化。
Modified screw anchors are suitable to the closure work.
经改进的螺旋锚适用于堵口抢险工程。
Modified screw anchors are suitable to the closure work.
经改进的螺旋锚适用于堵口抢险工程。
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