乳牙不仅是乳儿期、幼儿期及学龄前期咀嚼器官的重要组成部分,而且对儿童的生长发育,正常恒牙列的形成都起很重要作用,对于学龄前儿童错情况进行调查,有利于口腔医生对儿童错进行预防和早期矫治,笔者于2009年对长春市省、市直幼儿园2.5～6岁儿童进行了一次错畸形普查, Deciduous tooth is not only an important part of the masticatory period in infancy, early childhood and pre-school age, but also plays an important role in the growth and development of children and the formation of normal dentition. Investigation of the miscarriage of pre-school children is beneficial to the oral cavity Doctors on the prevention and early correction of child miscarriage, the author in 2009 in Changchun City, the city of kindergartens 2.5 to 6-year-old children had a wrong deformity census,