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首页> 外文期刊>European journal of orthodontics >In vitro evaluation of the frictional forces between brackets and archwire with three passive self-ligating brackets.
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In vitro evaluation of the frictional forces between brackets and archwire with three passive self-ligating brackets.

机译：用三个被动自结扎支架体外评估支架与弓丝之间的摩擦力。

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The aim of this in vitro study was to evaluate the frictional forces between bracket and archwire that included three passive self-ligating brackets (Damon SL2 SDS). The brackets were individually bonded to a brass mount using a preformed 0.021 x 0.025 inch stainless steel wire jig in order to exclude adverse tipping or torsion. The central bracket was positioned 1 mm higher than the others, in order that the three brackets were vertically unaligned. Thirty-six similar set-ups including in total 108 brackets were investigated using the same wire: copper (nickel-titanium) 0.014 inches. A testing machine was designed and constructed to measure the frictional forces between the wire and the three-bracket set-up. Twelve set-ups were tested to measure kinetic frictional forces between the wire and unaligned passive self-ligating brackets used in the closed position. The frictional properties of two sets of 12 three-bracket set-ups (control) were tested and measured with an open slide and conventional ligation. A stainless steel ligature wire was used in the former, while elastomeric modules were employed in the latter. One-way analysis of variance showed a significant effect of ligation mode on the frictional properties of the three-bracket set-ups (P < 0.001). Post hoc pairwise comparison showed that the frictional forces arising from passive self-ligation were significantly lower (P < 0.01) than those resulting from elastic ligation. The same result was achieved when comparing self-ligation and metallic ligation (P < 0.01). No significant difference was found when comparing elastic and metallic ligation.
机译：这项体外研究的目的是评估支架与弓丝之间的摩擦力，其中包括三个被动自结扎支架（Damon SL2 SDS）。使用预成型的0.021 x 0.025英寸不锈钢钢丝夹具将支架分别粘结到黄铜底座上，以消除不利的倾斜或扭转。中央支架的位置比其他支架高1毫米，以使三个支架在垂直方向上未对齐。使用相同的导线：0.014英寸铜（镍钛）对36个相似的装置进行了研究，包括总共108个支架。设计并构造了一种测试机，用于测量金属丝和三支架装置之间的摩擦力。测试了十二个装置，以测量在闭合位置中使用的导线与未对准的被动自绑扎支架之间的动摩擦力。用开放式载玻片和常规结扎方法测试和测量两组12个三托架装置（对照组）的摩擦性能。前者使用不锈钢绑扎线，后者使用弹性体模块。单向方差分析显示结扎模式对三托架装置的摩擦性能有显着影响（P <0.001）。事后成对比较显示，被动自结扎产生的摩擦力明显低于弹性结扎产生的摩擦力（P <0.01）。比较自连接和金属连接的结果相同（P <0.01）。比较弹性结扎和金属结扎时未发现明显差异。

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