摘要
目的:探究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动摩擦力状况。方法:在人工唾液条件下,4个时间段:0、15、30、45 d,使用Instron万能材料力学实验机,模拟弓丝在后牙段滑动,按正交设计测试4种直丝托槽与4种弓丝组合在后牙段的动摩擦力。结果:3M MBT托槽的动摩擦力最小,0.48mm×0.64 mm方丝的动摩擦力最大,0.46 mm圆丝的动摩擦力最小。弓丝、托槽组合在人工唾液条件下作用15 d动摩擦力最大、30 d动摩擦力最小。结论:0.46 mm圆丝的动摩擦力最小;人工唾液作用30 d动摩擦力最小;3M MBT托槽比较适合于滑动法关闭间隙。
Objective：To study the dynamic frictional resistance in the buccal segment between preadjnsted brackets coupled with different archwires, at different times under artificial saliva condition. Methods： The dynamic friction of different combinations of 4 kinds of preadjusted brackets and 4 arehwires were tested simulating archwires sliding in the buccal segments at 4 different times（0, 15, 30, 45 d）under artificial saliva condition by using Instron universal testing machine. Results： The dynamic frictional resistance of combinations of3M MBT bracket and all archwires were the smallest. The combinations of 0.46 mm inch stainless steel round wire and all brackets produced significantly lower dynamic frictional resistance than that of other archwires. The 0.48 mm × 0.64 mm inch stainless steel rectangular wire produced the highest dynamic frictional resistance combined with all preadjusted brackets. The dynamic frictional resistance of combinations of archwires and brackets were highest at the 15th day and smallest at the 30th day under artificial saliva condition. Conclusion： 0.46 mm stainless steel round wire pro- duces the smallest dynamic frictional resistance combined with all preadjusted brackets. 3M MBT brackets are more favorable to sliding mechanics compared with other brackets. As for time, the lowest dynamic fi＇ictional resistance exhibits at the 30th day under artificial saliva condition.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2009年第1期120-123,共4页
Journal of Practical Stomatology
关键词
人工唾液
动摩擦力
托槽
弓丝
Artificial saliva
Dynamic frictional resistance
Bracket
Archwire
