Measurements of the torque moment in various archwire-bracket-ligation combinations
Measurements of the torque moment in various archwire-bracket-ligation combinations
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DOI：
10.1093/ejo/cjr022
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发表时间：
2012-06-01
影响因子：
2.6
通讯作者：
Shimizu, Noriyoshi
中科院分区：
文献类型：
--
作者：
Hirai, Miyuki;Nakajima, Akira;Shimizu, Noriyoshi
三阶弯曲产生的扭矩对于牙齿运动很重要。本研究的目的是测量各种弓丝和托槽组合在目标牙齿处可以传递的扭矩。使用带有 0.018 和 0.022 英寸槽的不锈钢 (SS) 上支架、两种尺寸的镍钛 (Ni-Ti) 合金丝以及每个支架的三种尺寸的 SS 丝。用松紧带或金属丝将金属丝结扎。使用扭矩计测量由各种弓丝-托槽-结扎组合传递的扭矩。采用方差分析（多次比较试验和事后使用Tukey's诚实显着性差异检验）进行统计分析。扭矩随着扭矩程度和钢丝尺寸的增加而增加。在低于或高于40度扭矩时，SS和Ni-Ti钢丝之间的扭矩没有显着差异。钢丝结扎的扭矩明显大于弹性结扎的扭矩，分别为0.016 x 0.022和0.017 x 0.025 0.018 英寸槽支架中的 0.017 x 0.025 英寸和 0.019 x 0.025 英寸不锈钢和镍钛线，以及 0.022 英寸槽支架中的 0.017 x 0.025 和 0.019 x 0.025 英寸不锈钢和镍钛线，然而，使用全槽尺寸线时，两种结扎方法之间的扭矩没有显着差异。
The torque moment generated by third-order bends is important for tooth movement. The purpose of this study was to measure the torque moment that can be delivered by various archwire and bracket combinations at the targeted tooth. Stainless steel (SS) upper brackets with 0.018 and 0.022 inch slots, two sizes of nickel-titanium (Ni-Ti) alloy wires, and three sizes of SS wires for each bracket were used. The wire was ligated with elastics or wire. The torque moment delivered by the various archwire-bracket-ligation combinations was measured using a torque gauge. Statistical analysis was undertaken using analysis of variance (multiple comparison tests and post hoc using Tukey's honestly significant difference test. The torque moment increased as the degree of torque and wire size increased. There was no significant difference in torque moment between the SS and Ni-Ti wires at lower or higher than 40 degrees torque.The torque moment with wire ligation was significantly larger than that with elastic ligation with 0.016 x 0.022 and 0.017 x 0.025 inch Ni-Ti wires in the 0.018 inch slot brackets and the 0.017 x 0.025 and 0.019 x 0.025 inch SS and Ni-Ti wires in the 0.022 inch slot brackets. However, there was no significant difference in torque moment between either ligation method when using the full slot size wires.