新研制自锁托槽与传统翼结扎托槽摩擦力的比较(英文)

Comparison of frictional force between newly developed self-locking brackets and conventional tie-wing brackets

背景:进口自锁托槽价格昂贵,需要开发成本低、易操作的国产自锁托槽。目的:介绍一种新式托槽,并观察新研制自锁托槽的摩擦力。设计、时间及地点:生物力学对比实验,于2004-01在哈尔滨医科大学实验室完成。材料:自制自锁托槽和国产传统翼结扎不锈钢托槽各10个;国产Ni-Ti圆丝、澳大利亚不锈钢圆丝、国产不锈钢方丝各10根。方法:两种托槽与3种弓丝分别组合分组。在微电机的驱动下,以1mm/min的速度拖动拉力传感器,使另一端结扎在托槽内的弓丝受拉移动,模拟矫治过程中牙齿移动情况。主要观察指标:在存储示波器上观察波形并读取数据,测出各组摩擦力进行比较。结果:在其他条件相同的情况下,无论与哪种弓丝组合,翼结扎托槽的摩擦力均远大于自锁托槽(P<0.001)。无论与哪种托槽组合,Ni-Ti丝的摩擦力远大于澳丝和不锈钢方丝(P<0.001),方丝的摩擦力大于澳丝(P<0.01)。结论:自锁托槽属低摩擦托槽,符合口腔正畸科临床医生施加矫治力的要求。

BACKGROUND： Imported self-locking brackets cost much. So it is necessary to develop low-cost and easy-to-operate domestic self-locking brackets. OBJECTIVE： To introduce a newly developed self-locking brackets, and investigate the frictional forces of the brackets. DESIGN, TIME AND SETTING： Biomechanical controlled analysis was performed in the Laboratory of Harbin Medical University in January 2004. MATERIALS： Self-made self-locking brackets and domestic conventional tie-wing stainless steel brackets; domestic Ni-Ti round wire, Australian stainless steel round wire, and domestic stainless steel rectangular wire. METHODS： Two kinds of brackets were combined with three kinds of arch wires. Under the drive of micromotor, pull sensor moved at I mm/min. An arch wire, which was ligated in the bracket, was dragged. Thus, teeth＇s shift was imitated. MAIN OUTCOME MEASURES： Waveshape was observed through the use of storage oscillograph and corresponding data were recorded. Frictional force was determined and compared. RESULTS： Under the same other conditions, no matter which kind of arch wires were combined with, tie-wing brackets produced greater frictional force than self-locking brackets （P 〈 0.001 ）. Under the same other conditions, no matter which kind of brackets were combined with, Ni-Ti wire produced greater frictional force than Australian stainless steel round wire and domestic stainless steel rectangular wire （P 〈 0.001 ）. In addition, domestic stainless steel rectangular wires produced greater frictional force than Australian stainless steel round wires （P 〈 0.001 ）. CONCLUSION： Self-locking bracket produces low frictional force, so it is fit for orthodontic doctors to use the corrective force.