Abstract:

Abstract：Objective To evaluate the efficiency of mini-screw implants as anchorage for extruded molar intrusion. Methods Thirteen patients with over-erupted maxillary molars were selected，including 9 patients with extruded maxillary first molars because mandibular first molars missed，and 4 patients with extruded maxillary second molars because of molars scissors bite on one-side posterior teeth. All the extruded first maxillary molars were intruded in gingival direction with mini-screw implants anchorage. Lateral cephalograms and orthopantomograph were taken at the beginning and the end of the treatment. The movement of molars in vertical dimension was analyzed. Results The extruded first maxillary molars were intruded （3.00±0.65）mm averagedly in 6.5 months. Conclusion Mini-srcew implant as anchorage is an effective method to intrude the extruded maxillary molars.

Key words: mini-screw implant, anchorage, molar extrusion, molar intrusion, scissors bite

摘要：

目的 探讨以微种植体为支抗压低伸长磨牙的有效性。方法 选择2010年6月至2012年3月来大连博大口腔诊所就诊的13例需正畸压低伸长磨牙患者。其中9例因下颌第一磨牙长期缺失未进行修复，致上颌第一磨牙过度伸长，造成垂直向修复空间不足，不能直接进行义齿修复，需要压低上颌第一磨牙；另外4例因单侧第二磨牙正锁牙合致上颌第二磨牙伸长、颊倾，对应的下颌第二磨牙舌倾。所有患者均利用微种植体作为支抗， 使用弹力链施力于伸长的磨牙，产生根向压入力，同时对于正锁牙合磨牙调整其不良颊舌向倾斜。治疗前后拍摄头颅侧位片和曲面断层片。结果 9例因修复需要压低伸长磨牙的患者，伸长的磨牙均成功压低，获得了足够的义齿修复空间，并进行了种植义齿或固定义齿修复；4例单侧第二磨牙正锁牙合的患者，上颌伸长的第二磨牙得到压低，且颊向倾斜得到改正。13例患者伸长的磨牙平均压入（3.00±0.65）mm，治疗时间平均为（6.50±0.59）个月。 结论 采用微种植体作支抗可有效压低伸长的上颌磨牙，且方便、快捷。

关键词: 种植体, 支抗, 磨牙伸长, 磨牙压低, 正锁牙合