Results: spase of extraction of the lower first molar have closed entirely, have completely distoocclusion. all cases had good treatment effects after orthodontic treatmen...

• 结果:拔牙间隙完全关闭,达到完全远中关系,获得理想的治疗效果。结论:矫治设计过程中,保留更多的健康牙位,维持口腔的功能,熟练掌握间隙关闭的控制方法。