[Risk during orthodontic treatment of the impacted teeth].

The treatment of the impacted teeth is often challenging. During orthodontic treatment of the impacted teeth, unexpected tooth movement may occur for a variety of reasons including inadequate anchorage, inappropriate force vectors, ankylosis of the impacted tooth, traumatic external root resorption in adjacent teeth, and/or bony fenestration. Although cone-beam CT (CBCT) can clearly identify the location of impacted teeth, clinicians should avoid other difficulties before and during the traction of impacted teeth. This article discussed the risk factors during treatment of impacted teeth and presented some reasons of unsuccessful cases.埋伏阻生牙的正畸治疗具有较大的挑战性。尽管在锥形束CT的辅助下医师可精准判断埋伏阻生牙的三维位置，但在正畸牵引过程中依然存在一些不可避免的风险，牙齿可因支抗不足、牵引方向错误、根骨粘连、牙根吸收以及骨开窗和（或）骨开裂等问题而产生不可预测的移动。本文对埋伏阻生牙在正畸治疗过程中可能出现的各种风险进行分析，讨论牵引失败的可能原因，并提出临床建议和防范措施，以供临床医师参考。.