微不锈钢种植体支抗的稳定性研究

目的：分析不同施力时间对微不锈钢种植支抗稳定性的影响。方法：选择20例错牙合畸形患者（男10例,女10例）,年龄16～18岁,分别将种植钉被植入每位患者上颌两侧第一前磨牙和第一磨牙区作为种植钉支抗内收前牙,共植入40颗不锈钢种植钉。男女患者按加载时间不同被随机平分为两组,实验组1：种植钉植入后便采用镍钛拉簧即刻加力,实验组2：4周后在进行加力,分别通过头颅侧位片测量种植钉加载前后半年的位移变化。然后对两个实验组进行统计学分析。结果：实验组1：种植钉在矢状向上平均移动了1.31mm,垂直向上平均移动了1.53mm。实验组2：种植钉在矢状向和垂直向的平均位移是0.83mm和1.03mm。结论：不锈钢种植钉能够为内收前牙提供稳定和可靠的支抗,植入4周后再施力更有助于种植钉的稳定。

Study on the stability of stainless miniscrew used as orthodontic anchorage

Objective To study the stability of stainless steel implant used as anchorage under different force time.Methods Twenty malocclusional patients（10males,10females average age 16～18 years old）with a total forty miniscrews were examined.Miniscrews were insered on the maxillary tooth-bearing area between the second bicuspid and the first molar as a direct anchorage for anterior teeth extraction.All the patients were divided into 2 groups.Force was activated immediately by nickel-titanium coil springs in group 1 after the insertion of the mini-screws.After 4 weeks the force was applied in group 2.the distance about the movement of the forced miniscrew were mearsured by the cephalometric radiographs at the beginning and half year later.Results In group 1,the miniscrews were tipped vertically 1.53mm and the sagittal distance of movement was 1.31mm on average.In group 2,the distance was 0.83mm sagittally and 1.03mm vertically.Conclusion The stainless steel miniscrew could provide enough anchorage control for anterior teeth extraction.It is more stable for force exertion on after 4 weeks.