对３２位乳牙期反病人头影测量研究发现；乳前牙反病人中ＳＮＡ减小不明显，而ＣＶ值的减小普遍存在。说明反形成机制中，中西部发育不足是一重要原因；同时可见下颌骨的生长型和生长方向已显异常。提示乳前牙反不仅应强调尽早矫治，而且针对反形成机制选择有效的矫治方法更显重要。 Study of 32 primary deciduous patients with anti-headache measurements found; anti-SLE patients with anti-SNA reduction is not obvious, while the reduction of CV values ​​prevalence. This shows that anti-formation mechanism, the central and western underdevelopment is an important reason; the same time, we can see the growth of the mandibular growth and growth patterns have been abnormal. Prompted not only anterior decoction should not only early correction, but also against the formation of anti-formation mechanism to choose an effective method of correction is even more important.