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至今,治疗伴有拥挤的Ⅱ类错(牙合)的流行方法是拔除前磨牙。特别是在下颌,拔牙隙的关闭是利用后牙的自然近中移动来完成。但是在某些病例中,这样会导致直接与拔牙隙相邻的那些牙倾斜。并伴有不良的邻间接触关系。在这些病例中,有时拔除第二磨牙是比较好的代替方法。拔除第二磨牙的一个基本要求是第三磨牙存在,其牙冠发育
Until now, the popular method of treating type II malocclusion with congestion has been to remove the premolar. Especially in the jaw, pull the tooth gap closure is the use of the natural movement of the posterior teeth to complete. In some cases, however, this can result in tilting those teeth that are directly adjacent to the tooth gap. Accompanied by poor relations between adjacent contacts. In these cases, sometimes the removal of the second molar is a better alternative. One of the basic requirements for removal of the second molar is the presence of the third molar, whose crown is developing