种植体支抗正畸治疗中上颌磨牙稳定性的初步研究

Stability of upper molars with the application of implant anchorage

目的应用微螺钉型种植体支抗内收上颌前牙过程中,观察上颌第一磨牙位置的变化,评价种植体支抗的疗效。方法成年上颌前突患者15例,应用上颌后牙区微螺钉型种植体支抗内收前牙。通过头影测量的方法观察种植体和切牙在矢状方向上的位置改变,通过模型测量的方法观察上颌第一磨牙在三维方向上的位置变化。配对t检验比较治疗前后的差异。结果治疗前、后28枚种植体在矢状面上的位置改变,差异无统计学意义(P>0·05)。9例患者上颌切牙切端平均水平内收6·99mm,在垂直方向上位置改变的差异无统计学意义(P>0·05)。28颗上颌第一磨牙的近远中向移动、旋转和倾斜移动,差异均不具有统计学意义(P>0·05)。结论初步临床观察结果表明,微螺钉型种植体支抗可以实现理想的支抗控制效果。

Objective To investigate the stability of upper molars with the application of microscrew implant anchorage during orthodontic treatment. Methods Fifteen adult patients with severe maxillary protrusion were included. Upper first premolars were extracted and upper posterior anchorage was reinforced with micro-screw implant in all patients. The average treatment period to close the extraction space was 10. 5 months. Cephalometric and cast analysis were carried out. Results During the treatment, the micro-screw implants kept stable in sagittal plane; neither the mesial-distal movement nor the rotation or tipping of the upper molars during the treatment was of statistic significance （ P 〉 0. 05 ） ; the edge of upper incisors was retracted by 6. 99 mm on average, and no significant vertical change was observed（P 〉0. 05）. Conclusions Micro-screw implant could provide good anchorage control in the orthodontic treatment.