Budd Steven, Daskalogiannakis John, Tompson Bryan D
Department of Orthodontics, University of Toronto, Ontario, Canada.
Eur J Orthod. 2008 Dec;30(6):645-53. doi: 10.1093/ejo/cjn058. Epub 2008 Oct 28.
The objective of this investigation was to assess and compare the in vitro tribological behaviour of four commercially available self-ligating bracket systems. The frictional characteristics of the Damon3, Speed, In-Ovation R, and Time2 bracket systems were studied using a jig that mimics the three-dimensional movements that occur during sliding mechanics. Each bracket system was tested on the following stainless steel archwires: 0.016 x 0.022, 0.019 x 0.025, 0.020 round, and 0.021 x 0.021 inch Speed D-wire. An Instron testing machine with a 50 N load cell was used to measure the frictional resistance for each bracket/tooth assembly. The crosshead speed was set at a constant rate of 1 mm/minute, and each typodont tooth was moved along a fixed wire segment for a distance of 8 mm. Descriptive statistical analysis for each bracket/archwire combination with regard to frictional resistance was performed with a two-way, balanced analysis of variance for bracket type and wire size. The Damon3 bracket consistently demonstrated the lowest frictional resistance to sliding, while the Speed bracket produced significantly (P < 0.001) more frictional resistance than the other brackets tested for any given archwire. The self-ligation design (passive versus active) appears to be the primary variable responsible for the frictional resistance generated by self-ligating brackets during translation. Passively ligated brackets produce less frictional resistance; however, this decreased friction may result in decreased control compared with actively ligated systems.
本研究的目的是评估和比较四种市售自锁托槽系统的体外摩擦学行为。使用一种模拟滑动力学过程中发生的三维运动的夹具，研究了Damon3、Speed、In-Ovation R和Time2托槽系统的摩擦特性。每个托槽系统在以下不锈钢弓丝上进行测试：0.016×0.022、0.019×0.025、0.020圆形和0.021×0.021英寸的Speed D形丝。使用配有50 N测力传感器的Instron测试机测量每个托槽/牙齿组件的摩擦阻力。十字头速度设定为恒定的1毫米/分钟，每个模型牙沿着固定的弓丝段移动8毫米的距离。对每个托槽/弓丝组合的摩擦阻力进行描述性统计分析，采用双向、平衡的方差分析来分析托槽类型和弓丝尺寸。Damon3托槽始终表现出最低的滑动摩擦阻力，而对于任何给定的弓丝，Speed托槽产生的摩擦阻力明显（P<0.001）高于其他测试托槽。自锁设计（被动与主动）似乎是自锁托槽在平移过程中产生摩擦阻力的主要变量。被动结扎托槽产生的摩擦阻力较小；然而，与主动结扎系统相比，这种摩擦力的降低可能会导致控制力下降。
