El-Bialy Tarek, Alobeid Ahmad, Dirk Cornelius, Jäger Andreas, Keilig Ludger, Bourauel Christoph
Department of Orthodontics, School of Dentistry, University of Alberta, Edmonton, Canada.
Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.
J Orofac Orthop. 2019 Mar;80(2):68-78. doi: 10.1007/s00056-019-00168-8. Epub 2019 Feb 13.
The aim of this study was to compare force loss due to friction (Fr) during simulated canine retraction using different archwire dimensions and materials between conventional and new self-ligating brackets.
The tested brackets were (1) conventional brackets (Victory series, GAC twin and FLI twin), (2) self-ligating brackets (Damon-Q, FLI-SL, new/improved FLI-SL (I FLI-SL), SPEED, GAC innovation (R) and Ortho Classic) and (3) a low-friction bracket (Synergy). All brackets had a 0.022″ slot size. The tested archwires were stainless steel (0.018″; 0.016″x0.022″; 0.017″x0.025″; 0.018″x0.025″ and 0.019″x0.025″); nickel titanium (NiTi; 0.016″x0.022″; 0.017″x0.025″; 0.018″x0.025″ and 0.019″x0.025″) and titanium molybdenum alloy (TMA; 0.016″x0.022″; 0.017″x0.025″; 0.018″x0.025″ and 0.019″x0.025″). Canine retraction was experimentally simulated in a biomechanical set-up using a NiTi coil spring that delivered a force of 1 N. The simulated retraction path was up to 4 mm. Force loss due to friction was compared between groups using the Welch t‑test.
Force loss due to friction increased with increasing archwire size. Also, TMA showed the highest and stainless steel the lowest force loss due to friction. FLI-SL brackets showed the lowest Fr (31%) and Ortho Classic showed the highest (67%).
Increasing wire size generally showed increasing force loss due to friction. FLI-SL brackets showed the lowest, while Ortho Classic showed the highest friction.
本研究旨在比较在模拟犬牙后移过程中，传统托槽和新型自锁托槽使用不同尺寸和材料的弓丝时，由于摩擦力（Fr）导致的力损失情况。
测试的托槽包括：（1）传统托槽（Victory系列、GAC双丝弓托槽和FLI双丝弓托槽）；（2）自锁托槽（Damon-Q、FLI-SL、新型/改进型FLI-SL（I FLI-SL）、SPEED、GAC innovation (R)和Ortho Classic）；（3）低摩擦托槽（Synergy）。所有托槽的槽沟尺寸均为0.022英寸。测试的弓丝有不锈钢丝（0.018英寸；0.016英寸×0.022英寸；0.017英寸×0.025英寸；0.018英寸×0.025英寸和0.019英寸×0.025英寸）；镍钛丝（NiTi；0.016英寸×0.022英寸；0.017英寸×0.025英寸；0.018英寸×0.025英寸和0.019英寸×0.025英寸）以及钛钼合金丝（TMA；0.016英寸×0.022英寸；0.017英寸×0.025英寸；0.018英寸×0.025英寸和0.019英寸×0.025英寸）。在生物力学装置中，使用能产生1N力的镍钛螺旋弹簧对犬牙后移进行实验模拟。模拟后移路径长达4mm。使用Welch t检验比较各组之间由于摩擦力导致的力损失。
由于摩擦力导致的力损失随着弓丝尺寸的增加而增加。此外，TMA显示出最高的摩擦力导致的力损失，而不锈钢丝显示出最低的力损失。FLI-SL托槽显示出最低的Fr（31%），而Ortho Classic显示出最高的Fr（67%）。
一般来说，弓丝尺寸增加会导致由于摩擦力引起的力损失增加。FLI-SL托槽显示出最低的摩擦力，而Ortho Classic显示出最高的摩擦力。
