Samuels R H, Rudge S J, Mair L H
University of Liverpool, England.
Am J Orthod Dentofacial Orthop. 1993 May;103(5):464-7. doi: 10.1016/S0889-5406(05)81798-6.
A study of the efficiency of space closure after premolar extraction was undertaken, comparing a nickel-titanium closed coil spring and an elastic retraction module by using sliding mechanics along an 0.019 x 0.025-inch stainless steel arch wire in 0.022 x 0.028-inch preadjusted stainless steel brackets. The rate of space closure in 17 subjects was analyzed from study models and was found to be significantly greater and more consistent with the nickel-titanium closed coil springs than with the elastic modules, in both arches. There were no clinically observable differences in the tooth positions between the respective techniques.
开展了一项关于前磨牙拔除后间隙关闭效率的研究，通过在0.022×0.028英寸的预调整不锈钢托槽中，沿着0.019×0.025英寸的不锈钢弓丝使用滑动机制，比较镍钛闭合螺旋弹簧和弹性回缩组件。从研究模型分析了17名受试者的间隙关闭速率，发现在两个牙弓中，镍钛闭合螺旋弹簧的间隙关闭速率明显更高且更一致，相比弹性组件而言。两种技术在牙齿位置上没有临床可观察到的差异。
