Objective. The objective of this study was to quantify the properties of 11 commercially available nickel-titanium open-coil springs.;Methods. An Instron universal testing machine was used to measure the force generated when open-coil springs were compressed to one-half their original length and then unloaded. Eleven springs from 3 different manufacturers were tested at 5 testing sessions over a 12-week period.;Results. The average forces generated at the initial recording session for uniformly wound springs from GAC International and 3M Unitek(TM) were 19.3-42.7% and 9.7-38.8% below the manufacturers labeled force levels, respectively. GAC International 100g, 150g and 200g stop-wound coils demonstrated stepwise statistically and clinically significant force degradation over the 12-week period (p0.0001). Uniformly wound coil, specifically GAC International, light (100g) coils generated the lowest load/deflection ratios (23.7 g/mm).;Conclusions. Uniformly wound coils may produce lower load/deflection ratios, and lower maximum forces, which are generally considered more acceptable for tooth movement.
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机译：目的。这项研究的目的是量化11种市售的镍钛开放螺旋弹簧的性能。使用Instron万能测试机测量将开卷弹簧压缩到其原始长度的一半然后卸载时所产生的力。在12个星期的时间内进行了5次测试，对来自3个不同制造商的11个弹簧进行了测试。在初始记录期间，GAC International和3M Unitek™均匀缠绕弹簧产生的平均力分别比制造商标记的力水平低19.3-42.7％和9.7-38.8％。 GAC International 100g，150g和200g止绕线圈在12周的时间内逐步统计和临床证明了明显的力衰减（p <0.0001）。均匀缠绕的线圈，特别是GAC International，轻质线圈（100g）产生的负载/挠度比最低（23.7 g / mm）。均匀缠绕的线圈可能会产生较低的负载/挠度比和较低的最大力，通常认为它们对于牙齿运动更可接受。
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