Am J Orthod Dentofacial Orthop. 2010 Feb;137(2):213-7. doi: 10.1016/j.ajodo.2008.01.026.
Coated archwires have been introduced to improve esthetics during orthodontic treatment. Our aim was to investigate the mechanical properties of coated superelastic archwires compared with conventional superelastic archwires with conventional and self-ligating brackets.
Four types of orthodontic archwires were investigated, 2 superelastic nickel-titanium and 2 coated Ultraesthetic archwires in 0.016-in and 0.018 x 0.025-in dimensions (all from G&H Wire, Greenwood, Ind). To achieve the same nominal size, the coated archwire is constructed from a smaller archwire that, when coated, reaches the nominal dimensions stated for the archwire. Conventional edgewise Orthos and Damon 2 self-ligating brackets (both from Ormco, Orange, Calif) were used with each wire. All specimens were tested in a universal testing machine in a 3-point bending test at a speed of 1 mm per minute and deflected for 2 mm. Loading and unloading forces were recorded and load-deflection curves plotted.
Coated superelastic wires produced statistically significantly lower forces in loading and unloading when compared with the superelastic nickel-titanium wires at most archwire deflections (P <0.01). For nickel-titanium wires, loading values ranged from 189 to 1202 g, whereas the respective values for coated wires were 124 to 772 g. For all wires, an increase in size resulted in an increase in force. Interactions between wire type (coated or uncoated) and bracket type were observed.
Ultraesthetic coated archwires produced lower force values in loading and unloading compared with uncoated wires of same nominal size. The Damon 2 self-ligating bracket system produced lower force values in loading and unloading. The lowest forces were generated by the combination of Ultraesthetic coated archwires and Damon 2 self-ligating brackets.
为了改善正畸治疗中的美观度，现已推出涂层弓丝。本研究旨在比较涂层超弹弓丝与传统超弹弓丝的力学性能，这两种超弹弓丝分别搭配传统托槽和自锁托槽。
研究了 4 种正畸弓丝，分别为 2 种超弹镍钛丝和 2 种 Ultraesthetic 涂层弓丝，尺寸均为 0.016 英寸和 0.018 x 0.025 英寸（均来自 G&H Wire，Greenwood，Ind）。为了达到相同的公称尺寸，涂层弓丝由较小的弓丝制成，在涂层后达到所宣称的弓丝公称尺寸。使用每个弓丝分别搭配传统直丝弓 Orthos 和 Damon 2 自锁托槽（均来自 Ormco，Orange，Calif）。所有标本均在万能试验机上进行 3 点弯曲试验，以 1mm/min 的速度和 2mm 的偏置距离进行测试。记录加载和卸载力，并绘制载荷-挠度曲线。
在大多数弓丝挠度下，涂层超弹丝在加载和卸载时产生的力明显低于超弹镍钛丝（P <0.01）。镍钛丝的加载值范围为 189 至 1202g，而相应的涂层丝的加载值为 124 至 772g。对于所有的弓丝，尺寸的增加导致力的增加。观察到线类型（涂层或未涂层）和托槽类型之间的相互作用。
与具有相同公称尺寸的未涂层丝相比，Ultraesthetic 涂层弓丝在加载和卸载时产生的力值较低。 Damon 2 自锁托槽系统在加载和卸载时产生的力值较低。Ultraesthetic 涂层弓丝和 Damon 2 自锁托槽的组合产生的力值最低。
