国产微型钛钉正畸支抗即刻负载稳定性的实验研究

An Experimental Evaluation on the Stability of Homemade Titanic Miniscrew as an Orthodontic Anchorage Loaded Immediately

目的:评估国产微型钛钉种植支抗即刻负载稳定性。方法:随机选择犬下颌骨的一侧为实验组即加力组,另一侧为对照组即不加力组,植入国产微型钛钉各两颗。实验组钛钉间施力200克。三个月后处死动物,分别测量实验组、对照组钛钉间的位移变化及种植体—骨界面剪切力。结果:实验组钛钉间位移平均减少0.47mm;对照组几无变化;实验组种植体-骨界面剪切力明显大于对照组,平均为367.42牛顿。结论:国产微型钛钉作为种植支抗可满足临床要求。

Objective： To evaluate the stability of homemade titanic miniscrew as an Orthodontic anchorage loaded immediately. Methods： 16 homemade titanic miniscrews were inserted in the baccal posterior region of the lower jaw of four dogs. The control group （no force loaded） and the experimental group （200g- forces loaded immediately） were divided randomly. The changes of distances between the miniscrews of both groups were measured respectively after 3 - month force application period. The shear bone strength of the interface between miniscrew and bone in each group was also measured with a push test.Results： The mean changes of distances between 2 miniscrews in the experimental group was 0.47mm and nearly 0.00mm in the control group; the shear bone strength of the experimental group, with an average level of 367. 42N, was significantly higher than the control group one. Conclusion： The homemade titanic miniscrew can serve as an orthodontic anchorage loaded immediately.