To compare the level of friction resistance (fr) of different design self-ligating brackets using various bracket-wire combination in dry state during orthodontic phase of leveling and aligning.
探讨在干燥条件下，在牙齿排齐整平阶段应用不同的自锁托槽与不同的镍钛圆丝组合所产生的滑动阻力。
Compared to normal stainless steel orthodontic brackets, the nano-TiO_2 ceramic coated orthodontic brackets exhibit good surficial characters: low surface roughness and low bracket-wire friction.
纳米陶瓷涂层直丝弓托槽与国产普通金属直丝弓托槽相比，具有良好的表面光洁度，且托槽-弓丝摩擦力明显减小。
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