在第二阶段治疗结束时，上下牙齿应排列整齐，拔牙间隙关闭，前牙覆始覆盖基本正常，磨牙为中性关系。一般情况下，直丝弓矫治器在完成阶段仅需对牙齿作小量的调整，即按照正常秩的6项标准对牙位及范关系进行精细调整。由于任何一种直丝弓矫治器托槽的设计不可能完全适合所有患 At the end of the second phase of treatment, the upper and lower teeth should be arranged neatly, the extraction gap is closed, the anterior cover covers the basic normal, molars are neutral. Under normal circumstances, straight wire appliance in the completion stage only a small amount of teeth to adjust, that is, according to the normal rank of six criteria on the dental position and the relationship between the fine-tuning. Because any kind of straight wire appliance bracket design can not be completely suitable for all patients