单晶和多晶陶瓷托槽与金属弓丝摩擦力的对比研究

Comparative study on frictional forces between monocrystal ceramic bracket and polycrystalline ceramic bracket when com- bined with arch-wires

目的对单晶陶瓷托槽和多晶陶瓷托槽的摩擦力学性能进行初步测试,并与相同槽沟尺寸的金属托槽进行比较。方法使用万能材料力学实验机测试单晶陶瓷托槽、多晶陶瓷托槽及金属托槽与2种金属弓丝在弹力结扎圈结扎下的最大静摩擦力和平均动摩擦力。结果单晶及多晶陶瓷托槽与两种弓丝结合产生的摩擦力较金属托槽大,多晶陶瓷托槽的摩擦力较单晶陶瓷托槽的摩擦力大(P<0.05)。结论单晶陶瓷托槽与金属弓丝的摩擦力较多晶陶瓷托槽小,但较金属托槽大。

Objective A preliminary test was to be performed to test the friction properties of monocrystal ceramic bracket and poly- crystalline ceramic bracket compared with metal bracket of the same size. Methods The maximum static friction force and the average dynamic friction of monocrystal ceramic bracket, polycrystalline ceramic bracket and metal bracket combined with two kinds of metal arch-wires were tested by a universal testing machine. Results The friction produced by the combination of monocrystal ceramic brack- et or polycrystalline ceramic bracket with two kinds of arch-wires was greater than the metal bracket. The metal bracket badsmallestfric- tional forceofthree kinds of brackets. The monoerystal ceramic bracket had smaller frictional force than polycrystalline ceramic bracket. Conclusions The frictional force of monoerystal ceramic bracket and arch-wires is smaller than that of polycrystalline ceramic bracket, but is greater than that of metal bracket combined with arch-wires.