Parkhouse R C
Glan Clwyd Hospital Trust, North Wales, UK.
Am J Orthod Dentofacial Orthop. 1998 Apr;113(4):421-30. doi: 10.1016/s0889-5406(98)80014-0.
The Differential Straight Arch technique, more commonly known as "Tip-Edge" (TP Orthodontics Inc.), uses a modified edgewise type bracket to allow differential tooth movement. As bracketed teeth incline toward their finishing positions, the geometry of the arch wire slot causes the vertical slot dimension available to the arch wire to increase. Advantage has been taken of this facility, to evolve an entirely new torquing system for final finishing, during the root correction phase. Instead of increasing rectangular arch wire size to fit the arch wire slot, as with conventional edgewise brackets, the Tip-Edge method reduces the vertical arch wire slot dimension to achieve a precise, three-dimensional relationship to a full-sized rectangular arch wire. The active component is provided by auxiliary springs. The method, which awaits mathematical analysis, is described and illustrated with two case reports.
差动直弓技术，更为人熟知的名称是“Tip-Edge”（TP正畸公司），它使用一种改良的方丝弓型托槽来实现牙齿的差动移动。当带托槽的牙齿向其最终位置倾斜时，弓丝槽的几何形状会使弓丝可用的垂直槽尺寸增加。在牙根矫正阶段，利用这一特性开发了一种全新的用于最终矫治的转矩系统。与传统方丝弓托槽不同，Tip-Edge方法不是通过增加矩形弓丝尺寸来适配弓丝槽，而是减小垂直弓丝槽尺寸，以实现与全尺寸矩形弓丝精确的三维关系。主动部件由辅助弹簧提供。本文通过两个病例报告对该方法进行了描述和说明，该方法有待数学分析。
