微型种植体支抗近移磨牙过程中的强支抗效应

Evaluation of micro-implant transition mesially molar by implant anchorage

背景:在正畸治疗中,移动下颌磨牙需要强大的支抗控制,这也成为临床正畸所遇到的一个难题。目的:采用微型种植体作支抗,观察近移安氏Ⅰ类错患者下颌磨牙的临床效果及其作用特点。方法:选择15例下颌第一磨牙缺失成人患者,将24枚微型种植体植于下颌第二前磨牙与第一前磨牙之间颊侧牙槽骨内,Ni-Ti螺旋弹簧拉长后置于下颌第二磨牙与微型种植体之间,拉磨牙近中移动。通过测量下颌第二磨牙在近远中方向、垂直向的位置变化,以衡量磨牙的位置改变。并通过下颌中切牙的位置变化,评价支抗强弱。结果与结论:疗程10.4个月,下颌第二磨牙平均移动速度为0.8mm/月;平均近中移动8.5mm,垂直向没有变化;磨牙长轴向远中倾斜角度为2.5°,下颌中切牙位置无改变。提示所有下颌第二磨牙均被近移到了恰当的位置,未见前牙支抗丧失。种植体作为支抗在拉下颌磨牙近移的过程中,发挥了强支抗的作用。

BACKGROUND：It needs strong anchorage for shifting mandibular molar in orthodontics,which is a difficult problem to clinical orthodontic doctors.OBJECTIVE：To evaluate clinical effects and the characters by micro-implant anchorage during mandibular molars mesialization in Class I malocclusal patients.METHODS：A total of 24 micro-implants were embedded mandibular bones between mandibular second premolar and mandibular first premolar of 15 Angle I malocclusal patients as clinical anchorages for mesializing mandibular molars.The position changes of mandibular molars were measured from mesiodistal direction and vertical direction,and the implant anchorage loss was evaluated by maxillary central incisor.RESULTS AND CONCLUSION：The course of treatment was 10.4 months,and the velocity of mandibular second molar mesializing was 0.8 mm per month,with 8.5 mm in mesiodistal direction,there was no changes in the vertical direction.The distal tipping angle of molar was 2.5°,and the mandibular central incisor did not move.The method successfully mesialized mandibular molars to appropriate positions.No anchorage loss was found.The implant plays absolute anchorage during mandibular molar mesialization.