利用微型种植体支抗压低下颌磨牙的临床研究

目的研究安氏Ⅰ类错患者中,采用微型种植体作支抗,压低下颌磨牙的临床效果及其作用特点。方法选择12例成人患者,将24枚微型种植体植于下颌第一磨牙近、远中的颊侧牙槽骨内,Ni-Ti螺旋弹簧拉长后分别连接于下颌第一磨牙带环颊侧,来压低下颌第一磨牙。测量磨牙的压低量、颊舌向的位置变化、近远中倾斜度以及磨牙移动的速度,并通过治疗前后的X线片对比以观察磨牙牙根有无吸收,牙周膜腔的变化情况。通过测量下颌第二磨牙与下颌中切牙的位置变化来衡量支抗强弱。结果下颌第一磨牙平均压低3.5mm,疗程5.2个月,平均移动速度0.67mm/月;磨牙牙冠近颊尖、远颊尖分别颊向移动1.2mm、1.3mm。磨牙牙根没有吸收,牙周膜腔宽度没有改变。下颌第二磨牙与下颌中切牙的位置没有改变。结论所有下颌磨牙均被压低到了恰当的位置,为对颌牙的修复治疗提供了足够的间隙。同时该方法临床操作简单易行,适于推广。

Compacting Mandibular Molar by Using Micro-implant Anchorage: A Clinical Study

Objective To evaluate clinical effects and the features by micro-implant anchorage in compacting mandibular molars in Angle Class I malocclusion. Methods Twenty-four micro-implants were embedded mesial and distal bone of mandibular first molar of 12 Angle Class I malocclusion patients as clinical anchorages for compacting mandibular molars. The position changes of mandibular molars from compaction and the buccolingual position and mesiodistal inclination were measured and the compacting velocity, root obsorbsion and periodontal membrane change were observed. The anchorage was evaluated by the change of mandibular second molar and mandibular central incisor. Results The compaction was 3.5ram, the course of treatment was 5.2months, the velocity of mandibular first molar compacting was 0.67 mm per month and the buccall movement of mesial and the distal cusp were 1.2mm and 1.3ram, with no root absorption and periodontal membrane change and with no change in the location of mandibular second molar and mandibular central incisor. Conclusion The method can successfully compact mandibular molars to appropriate positions, providing enough space for antagonizative maxillary first molar restoration. And meantime, it is easy and convenient in the clinical application, worthy of being popularized.