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 参见附件(2170KB，3页)。

  [摘要]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。

 [关键词]不锈钢；微种植体；稳定性

 [中图分类号]R783.5 [文献标识码]A [文章编号]1008-6455(2011)10-1617-03

 Study on the stability of stainless miniscrew used as orthodontic anchorage

 LI Yong-feng,XIAO Xuan-dui,HE Zhan-feng,WANG Chao-yan,SUN Xiao-ai

 (Department of Stomatology,Chang'an Hospital,Xi'an 710018,Shaanxi,China)

 Abstract:ObjectiveTo study the stability of stainless steel implant used as anchorage under different force time.MethodsTwenty 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.ResultsIn 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.

 Key words:stainless steel;miniscrew implant;stability

 由于种植体支抗恒定，无需患者配合就能获得理想的治疗效果等诸优点，目前被临床上广泛应用。当前临床上主要应用的种植体支抗大体可以分为牙种植体、微型钛板，微种植钉[1]3种，其中微型种植钉在其中因体积小、创伤小、易于植入和取出，植入后加载时间早，植入位置较多和植入方法简单而被临床医师广为采用。

 微种植钉支抗虽然因其体积小而存在一系列的众多优势，与此同时稳定性便成为临床中比较关心的话题，但过去大多研究主要集中在钛钉的稳定性方面，而近年来不锈钢钉作为一种新材料因其自身强度较好不易折断，开始逐渐被应用于临床。我科特选择20例不锈钢种植钉支抗患者就其施力时间进行研究，以期获得更好的临床稳定性。

 1材料和方法

 1.1患者选择及其分组：选择2008年1月～2010年1月在我院进行错牙合畸形治疗的患者20例(男10例，女10例)，年龄16～18岁，男女患者按加载时间不同被平分为两组,均无明显禁忌症，符合种植钉支抗植入的适应证要求，共植入微型种植钉40枚 ......