Haskell B S, Spencer W A, Day M
Department of Orthodontics, School of Dentistry, University of Louisville, Ky.
Am J Orthod Dentofacial Orthop. 1990 Dec;98(6):488-98. doi: 10.1016/0889-5406(90)70014-4.
In the second part of this series, three clinical examples are presented to illustrate the use of auxiliary space-closure springs with clinically manageable moment-to-force ratios and new canine brackets to accommodate these springs within the framework of conventional and straight-wire 0.018-inch appliance systems. Eligiloy retraction spring models (0.1650 inch x 0.02150 inch) in the edgewise mode were developed for translational movements along a main archwire. The effects of different preactivation bends for influencing intraarch anchorage are shown for the conditions of reciprocal closure, posterior protraction, and anterior retraction.
在本系列的第二部分，给出了三个临床实例，以说明辅助间隙关闭弹簧的使用，这些弹簧具有临床可管理的力矩与力的比值，以及新型尖牙托槽，以便在传统的和直丝0.018英寸矫治器系统框架内使用这些弹簧。开发了用于沿主弓丝进行平移运动的方丝弓模式的Eligiloy牵引弹簧模型（0.1650英寸×0.02150英寸）。展示了在交互关闭、后牙前伸和前牙后缩情况下，不同预激活弯曲对影响牙弓内支抗的作用。
