Rock W P
University of Birmingham Dental School, St Chad's Queensway.
Br Dent J. 1990 Apr 7;168(7):298-302. doi: 10.1038/sj.bdj.4807183.
Severe Class II division 2 is a difficult malocclusion to treat properly, especially when lower incisors contact palatal mucosa. Only fixed appliance therapy can achieve worthwhile and lasting improvement of the incisor relationship in this situation. In less severe cases, it may be possible to achieve limited objectives using removable appliances. When planning treatment, extraction of mandibular premolars should be avoided if at all possible.
严重的安氏II类2分类错颌畸形是一种难以妥善治疗的错颌畸形，尤其是当下切牙接触腭黏膜时。在这种情况下，只有固定矫治器治疗才能实现切牙关系值得且持久的改善。在不太严重的病例中，使用可摘矫治器可能实现有限的治疗目标。在制定治疗计划时，应尽可能避免拔除下颌前磨牙。
