很多朋友在正畸咨询时，_对医生建议拔除第三磨牙表示不理解，为了消除大家的疑虑，___现把正畸拔除第三磨牙的适应症总结如下：四川大学华西口腔医院正畸科韩向龙
1.第三磨牙虽已完全萌出，但无对颌牙、或与对颌牙接触不良；
2.第三磨牙位置不正，_部分萌出，___食物残留、细菌滋生、局部刺激导致溃疡反复发作，_经常引起冠周炎；
3.第三磨牙前倾阻生，影响第二磨牙远中面的清洁，加重第二磨牙致龋风险；
4.高角病例，_有前牙开合倾向的患者；
5.后牙锁合或反合，_拟通过交互牵引矫治的患者；
6.正畸治疗需远中移动后牙者。_最常见的两种情况是：前牙开合需MEAW技术远中竖直、压低后牙；Class III患者需MEAW技术远中移动后牙、或MIA远中移动整体下颌牙列；
7.对于拟行正颌手术者，___可以考虑在手术时拔除第三磨牙；
8.虽然对第三磨牙引起前牙拥挤的认识存在争论，_仍有部分医生建议拔除第三磨牙来预防矫治后牙列拥挤的复发。
附：Awisdom tooth, in humans, is any of the usual fourthird molars. Wisdom teeth usually appear between the ages of 17 and 25.Most adults have four wisdom teeth, but it is possible to have fewer （oligodontia）, or more, in which case they are called supernumerary teeth.Wisdom teeth commonly affect other teethas they develop, becoming impacted or "coming in sideways." They are often extractedwhen this occurs. About 35% of the population do not develop wisdom teeth at all. From Wikipedia