托槽不同回收方法对摩擦力影响的实验研究

An Experimental Research on the Influnce of Different Recycling Methods of Brackets on their Frictional Resistance

目的:探讨不同回收方法对托槽与弓丝间摩擦力的影响。方法:本试验采用四种不同回收托槽的方法处理新亚上中切牙方丝弓托槽,处理后的托槽用结扎橡皮圈与0.019×0.025英寸不锈钢方丝结扎,使用Instron万能材料力学实验机测量各组托槽弓丝组合的摩擦力。结果:灯烧组(酒精灯烧结组)和热超组(热处理并超声清洗组)托槽摩擦力相似,但大于其它组,差别具有有统计学意义(P<0.05);对照组和喷砂组(喷砂处理组)摩擦力相似,但大于热超电组(热处理并超声清洗再电解抛光组),具有显著的统计学差异(P<0.05);热超电组托槽的摩擦力小于其它组,差别有显著统计学意义(P<0.05)。结论:个别新亚方丝托槽的回收可以使用喷砂法,大批量的回收建议使用热超电法。

Objective：To discuss the effect of different recycling methods on the frictional force between bracket slots and arch wires. Method： The measurement of the frictional force of upper central incisor edgewise brackets , which was processed with four different bracket recycling methods , with 0.019 -0.025 inch stainl steel archwires under ligation bv elastics was conducted with Instron univer- sal dynamometer. Results：The frictional force of the sintered group （Bracket sintered spirit lamp ） and the heat -ultrasonic group （Bracket heated and cleaned by ultrasonic wave after the heat treatment ） was not statistically different, but higher than other groups（P 〈 0.05 ） ;The frictional force of the sand blasting group （Bracket sand blasting） and the control group was not statistically different, but higher than the heat -ultrasonic -electro group （Bracket electrolysis polishing after heat treatment and ultrasonic wave cleaning） ;The frictional force of the heat - ultrasonic - electro group was lower than other groups （ P 〈0. 05 ）. Results ： The sand blasting method would be used for individual bracket recycling, the heat -ultrasonic -electro method would be used for large number of bracket recycling.