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为评价导致Herbst矫治后Ⅱ类错(牙合)复发的牙和骨因素,及此二因素间的关系,作者对矫治后5年以上的15例复发病例和14例保持稳定的病例进行比较,分析了矫治前、矫治完成时,矫治完成后6个月时,矫治完成5年以后的侧位X线头影片。结果表明,切牙覆盖和磨牙近远中向关系的复发主要源于上下颌牙齿的改变。复发组上切牙唇向移动2.1mm(P<0.001),保持稳定组则舌向移动0.3mm,组间差异显著(P<0.05)。上磨牙复发组比保持稳定组
In order to evaluate the relationship between the two factors that lead to the recurrence of type II malocclusion after Herbst treatment, the authors compared the 15 recurrent cases over the past 5 years with the 14 stable cases, Analysis of the correction, the correction is completed, the correction is completed 6 months after the completion of correction 5 years after the lateral X-ray film. The results showed that the recurrence of the relationship between the incisor covering and molars was mainly due to the changes of the maxillary and mandibular teeth. In the recurrent group, the incisor lip moved 2.1 mm (P <0.001), while in the stable group, the lingual movement was 0.3 mm (P <0.05). Upper molar recurrence group than the stable group