人工唾液中直丝弓托槽与弓丝静摩擦力的实验研究

Experimental study on static frictional resistance between preadjusted brackets and archwires in artificial saliva

目的探讨人工唾液条件下,不同时间,几种直丝托槽与弓丝在后牙段的静摩擦力特点。方法在人工唾液条件下,4个时间段,测试4种直丝托槽与4种弓丝组合在后牙段的静摩擦力。结果0.46mm不锈钢圆丝的静摩擦力最小,0.48mm×0.64mm不锈钢方丝的静摩擦力最大。弓丝、托槽组合在人工唾液条件下作用15d静摩擦力最大、30d静摩擦力最小。结论0.46mm不锈钢圆丝的静摩擦力最小;人工唾液作用30d静摩擦力最小。

Objective To study the static frictional resistance in the buccal segment between preadjusted brackets coupled with different archwires, at different times under artificial saliva condition. Methods The static friction of 4 different combinations of preadjusted brackets and 4 archwires were tested simulating archwires sliding in the buccal segments at 4 different times under artificial saliva condition. Results The combinations of 0.46 mm stainless steel round wire and all brackets produced significantly lower static frictional resistance than those of other archwires. The 0.48 mm × 0.64 mm stainless steel rectangular wire produced the highest static frictional resistance, combined with all preadjusted brackets combinations. The static frictional resistance of combinations of archwires and brackets was the highest at the 15th day and was the smallest at the 30th day under artificial saliva condition. Conclusions 0.46 nun stainless steel round wire produced the smallest static frictional resistance, combined with all preadjusted brackets. As for time, the lowest frictional resistance exhibited at the 30th day under artificial saliva condition.