先天性全口缺牙或多数乳、恒牙缺少畸形是一种较少见的口腔病症,已知家族性病例具有遗传方面的特性;单发性病例与遗传的关系不显,其致病因素可能与内分泌失调、病毒感染、营养缺乏、药物和化学物质中毒、放射性损伤或其他外伤等有关。先天性缺牙畸形病例又常伴有皮肤、毛发、汗 Congenital edentulous or most of the milk, the lack of deformity of permanent teeth is a rare oral disease, known familial cases with genetic characteristics; single case of genetic and genetic relationship was not significant, the risk factors May be related to endocrine disorders, viral infections, nutritional deficiencies, drug and chemical poisoning, radioactive injury or other trauma and so on. Congenital lack of tooth deformity cases often accompanied by skin, hair, sweat