多数恒牙先天缺失２例陈慕新无锡县第二人民医院（２１４１８７）先天缺牙常与遗传因素有关。我们门诊治疗两患者为姐妹俩，虽均有多数恒牙缺失，但查无明显遗传，现报告如下。患者女，１８岁。检查两侧颌骨对称无畸形，口内缺牙多，仅有１１、１４、１５、１６、２１、２... The majority of permanent defects in two cases of congenital absence Chen Muxin Wuxi Second People's Hospital (214187) Often tooth missing and genetic factors. Our outpatient treatment of two patients for the sisters, although the majority of permanent teeth missing, but check no obvious genetic, are as follows. Patient female, 18 years old. Check both sides of the symmetry of the jaw without deformity, missing teeth and more mouth, only 11,14,15,16,21,2 ...