磨牙症是常见的口腔副功能活动，是指咀嚼食物以外的时段内，上下牙齿相互紧咬或磨动的现象。
Bruxism is a common oral parafunctional activity. It is generally defined as the activity of grinding or gnashing of the teeth at times other than during the mastication.
结论磨牙控根移动杆具有良好防止磨牙推进器推两个磨牙远移过程中的不利副移动作用，并能避免第二磨牙颊向错位。
Conclusion The molar root movement controller could prevent the side effects and avoid the second molar buccally positioned movement in the process of molar propeller moving the two molars distally.
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