微型种植体支抗在安氏I类双颌前突矫治中的应用研究

Study on the treatment of Angle class I bimaxillary protrusion malocclusion with micro implant anchorage.

目的:观察微型种植体支抗在安氏I类双颌前突矫治中的临床应用。方法:选择安氏I类双颌前突拔牙矫正患者36例,分为实验组和对照组,每组18例。实验组使用微型种植体作为支抗关闭间隙,对照组使用常规滑动法关闭间隙。通过术前术后X线头影测量分析进行对比研究。结果:所有病例通过矫治后,前牙突度及轴倾度得到改善,拔牙间隙均关闭。矫治后上下切牙内收明显,实验组UI-SN平均减少9.13°,L1-NB平均减少6.55°,UI-LI平均增加34.42°。上唇突点-H线平均减少0.16mm,下唇突点-H线平均减少0.26mm。实验组治疗前后上下颌磨牙无明显前移,与对照组比较有显著性差异(p<0.05)。结论:微型种植体支抗避免了上下颌磨牙的近中移动,能为安氏I类双颌前突病例的矫正提供稳定的支抗来源。

Objective： To investigate the clinic application of the treatment of Angle class I bimaxillary protrusion malocclusion with micro implant anchorage. Method： 36 bimaxillary protrusion patients were divided into two groups, 18 cases in each group. All patients were treated with extraction .The experimental group were treated by micro implant system, and the control group were treated by traditional sliding mechanics. The results were compared by cephalometric analysis taken before and after orthodontic treatment. Result： The position of anterior teeth were improved significantly in all the pa- tients and the extraction space were closed. Mesial movement of molars were avoided. There was statistically significantly difference of anchorage loss at molars between the experimental and control groups （P〈0.05）. Conclusion： micro implant could be an efficient method to reinforce the orthodontic anchorage on the treatment of bimaxillary protrusion malocclusion.