Arbuckle G R, Sondhi A
Am J Orthod. 1980 Jun;77(6):626-35. doi: 10.1016/0002-9416(80)90154-2.
An analysis of the mechanics required for distal movement of canine roots is presented and, on the basis of this analysis, a specific clinical approach is outlined. Three different root spring designs were tested for their ability to meet the previously determined requirements. The only spring that approached the established requirements was spring A-2. Spring types B and C did not meet the established requirements. Angular activations in excess of 20 degrees in 0.018 by 0.025 inch stainless steel wire without benefit of a loop resulted in permanent deformation of the appliance.
本文对犬牙根远端移动所需的力学进行了分析，并在此分析基础上概述了一种具体的临床方法。测试了三种不同的牙根弹簧设计满足先前确定要求的能力。唯一接近既定要求的弹簧是A-2型弹簧。B型和C型弹簧不符合既定要求。在未使用环的情况下，0.018×0.025英寸不锈钢丝的角度激活超过20度会导致矫治器永久变形。
