结论采用半切术技术保留下颌第一磨牙远中根的修复可获得满意效果。
Conclusion The hemisection can get satisfactory effect to repair the first mandibular molar with distal tooth reservated by selecting suitable tooth.
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.
目的：统计分析下颌第一、第二、第三磨牙牙冠近远中宽度、牙体长度、分根情况以及相关因素。
Objective: Statistical analysis of mandibular molar mesiodistal crown width and tooth length and development of root.
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