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。
The Self-Leveling feature brings the 350QX2 back to level flight when you release the right stick.
自流平功能带来的350QX2恢复水平飞行，当你松开右摇杆。
The Self-Leveling feature brings the 350QX2 back to level flight when you release the right stick.
自流平功能带来的350QX2恢复水平飞行，当你松开右摇杆。
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