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。
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.
之所以这样是因为对运动的阻力基本上源于滚动零件的变形，而不是滑动现象。
This is so because the resistance to motion is essentially due to the deformation of the rolling elements and, hence, is not a sliding phenomenon.
如果气门间隙需要调节，松开摇臂调节螺丝上的防松螺母，转动调节螺丝直到测隙规滑动时稍带阻力为止。
If valve clearance needs to be adjusted, loosen the locknut on rocker arm adjusting screw. Turn adjusting screw until feeler gauge slips with a slight drag.
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