Reicheneder C A, Gedrange T, Berrisch S, Proff P, Baumert U, Faltermeier A, Muessig D
Department of Orthodontics, Regensburg University Medical Center, Germany.
Eur J Orthod. 2008 Dec;30(6):654-60. doi: 10.1093/ejo/cjn053. Epub 2008 Nov 21.
The purpose of this study was to compare the frictional properties of four self-ligating metal brackets, Speed, Damon 2, In-Ovation, and Time, with those of three conventionally ligated metal brackets, Time, Victory Twin, and Discovery. The self-ligating Time bracket can also be used as a conventionally ligated bracket. Friction was tested 20 times for each bracket/wire combination using a Zwick testing machine with stainless steel wires in three different wire dimensions (0.017 x 0.025, 0.018 x 0.025, and 0.019 x 0.025 inches). All brackets had a 0.022 inch slot and the prescription of an upper first premolar. The data were statistically analysed with unsigned comparisons of all bracket/wire combinations using the Mann-Whitney U-test and the Games-Howell post hoc test. The results showed almost all brackets to have the lowest frictional force with a wire dimension of 0.018 x 0.025 inch. Friction of the self-ligating brackets using wire with a dimension of 0.018 x 0.025 inches was 45-48 per cent lower than with 0.017 x 0.025 and 0.019 x 0.025 inch wires. Friction of the conventionally ligated brackets showed a 14 per cent or less reduced friction with 0.018 x 0.025 inch wire compared with 0.017 x 0.025 and 0.019 x 0.025 inch wires. The self-ligating metal brackets showed lower frictional forces with a 0.018 x 0.025 inch wire than conventionally ligated brackets, whereas conventionally ligated brackets showed lower friction with 0.017 x 0.025 and 0.019 x 0.025 inch wire. Friction values vary with different bracket/archwire combinations and, therefore, the choice of a bracket system for treatment should consider the correct wire dimension to produce the lowest possible frictional forces.
本研究的目的是比较四种自锁金属托槽（Speed、Damon 2、In-Ovation和Time）与三种传统结扎金属托槽（Time、Victory Twin和Discovery）的摩擦性能。自锁式Time托槽也可作为传统结扎托槽使用。使用Zwick试验机，对每种托槽/弓丝组合，采用三种不同尺寸（0.017×0.025英寸、0.018×0.025英寸和0.019×0.025英寸）的不锈钢丝进行20次摩擦测试。所有托槽均有0.022英寸的槽沟，并按照上颌第一前磨牙的处方制作。使用Mann-Whitney U检验和Games-Howell事后检验，对所有托槽/弓丝组合进行无符号比较，对数据进行统计分析。结果显示，几乎所有托槽在弓丝尺寸为0.018×0.025英寸时摩擦力最低。使用尺寸为0.018×0.025英寸的弓丝时，自锁托槽的摩擦力比使用0.017×0.025英寸和0.019×0.025英寸弓丝时低45%-48%。与0.017×0.025英寸和0.019×0.025英寸弓丝相比，使用0.018×0.025英寸弓丝时，传统结扎托槽的摩擦力降低了14%或更少。自锁金属托槽在使用0.018×0.025英寸弓丝时比传统结扎托槽的摩擦力更低，而传统结扎托槽在使用0.017×0.025英寸和0.019×0.025英寸弓丝时摩擦力更低。摩擦值因不同的托槽/弓丝组合而异，因此，治疗中托槽系统的选择应考虑正确的弓丝尺寸，以产生尽可能低的摩擦力。
