反 牙合是一种较常见的牙 牙合 畸形 ,是下牙列之间覆 牙合覆盖关系的异常表现 ,是一种影响颌、牙合、面生长发育的畸形。为了解儿童反 牙合 的发病情况 ,以利开展防治工作 ,特进行了此项调查 ,现报告如下。1　对象和方法1.1　对象　 1998年～ 1999年在昆明市部分幼儿园中调查 Anti-occlusal joint is a more common deformity of the occlusal deformity, is the abnormal performance of the occlusal coverage between the lower dentition, is a deformity affecting the growth of the jaw, occlusal, facial growth. In order to understand the incidence of anti-obesity in children, to facilitate the prevention and control work carried out this survey, the report is as follows. 1 objects and methods 1.1 objects from 1998 to 1999 in some kindergartens in Kunming survey