正畸微型种植体的临床应用研究

Clinical study of stability of micro implant used as orthodontic anchorage

目的微型种植体承受正畸力后的稳定性研究。方法回顾2008年3月至2011年3月在佛山市禅城区中心医院口腔科确诊的安氏Ⅱ类错颌畸形患者26例,在上颌第二前磨牙与第一磨前牙之间的牙槽骨上植入微型种植体,用以支抗内收的上前牙。并于植入种植体后2周、6个月时摄X线头颅定位侧位片,比较加力前后变化,测量微型种植体的移位情况。结果 6个月后水平位移约为0.5mm,垂直位移平均约为0.4mm,与植入时相比具有统计学意义(P<0.05),其中微型种植体伸长者7例,占26.9%。结论微型种植体是一种相对稳定的支抗,在承受正畸力后,会出现位置移动以及自体伸长,所以在微型种植体植入时要注意避开血管、神经丰富的区域,植入后要定期复诊。

Objective To study the stability of micro implant anchorage after orthodontic force.Methods Totally 26 patients with micro implants as the maxillary anchorage from March 2008 to March 2011 to in our hospital were included in this study.Micro implants were inserted on the maxillary alveolar between the second premolar and the first molar as a direct anchorage for anterior teeth retraction.And at 2 weeks after implant placement,6 months,X ray skull lateral positioning,comparing changes before and after the afterburner,measuring micro-implant shifting.Results After 6 months the horizontal displacement of approximately 0.5mm,the average vertical displacement of approximately 0.4mm,with statistically significant when compared to implants（P0.05）,which mini-implant elongation in 7 cases,26.9%.Conclusions Micro implants is a relatively stable anchorage to withstand orthodontic force,the position will be mobile and self-body stretch,so the mini-implant should pay attention to avoid the blood vessels,nerve-rich area,regular follow-up after implantation.