Hamdan A M, Rock W P
Orthodontic Unit, University of Birmingham School of Dentistry, UK.
Br J Orthod. 1995 May;22(2):155-60. doi: 10.1179/bjo.22.2.155.
The forces exerted by archwires were measured in association with both Begg and Straight-Wire attachments. Seven stainless steel and three nickel-titanium wires were tested at vertical deflections equivalent to 20, 30, and 40 degrees, these being incorporated via anchor bends or reverse curve of Spee as appropriate to each system. All seven brands of stainless steel arches demonstrated similar performance. An increase in archwire diameter from 0.016 to 0.018 inch increased intrusive forces by 64 per cent for stainless steel and 58 per cent for nickel-titanium. Increasing anchor bend or reverse curve of Spee produced considerable force increases across the range of specimens. Begg archforms produced more force than Straight-Wire archforms of similar deflection when attached to molars only. Attachment of archwires to second premolars in addition to molars reduced the intrusive forces produced by Begg arches, but increased the forces of Straight-Wire arches.
对使用Begg矫治器和直丝弓矫治器附件时弓丝所施加的力进行了测量。测试了7根不锈钢丝和3根镍钛丝，垂直挠度分别相当于20度、30度和40度，根据每个系统的情况，通过锚固曲或Spee曲线反向曲来实现这些挠度。所有7个品牌的不锈钢弓丝表现出相似的性能。不锈钢弓丝直径从0.016英寸增加到0.018英寸时，压低力增加了64%，镍钛弓丝增加了58%。在整个样本范围内，增加锚固曲或Spee曲线反向曲会使力大幅增加。仅连接到磨牙时，相同挠度下Begg弓型产生的力比直丝弓弓型更大。除磨牙外，弓丝连接到第二前磨牙会降低Begg弓型产生的压低力，但会增加直丝弓弓型产生的力。
