迄今为止,教科书对恒牙萌出的描述为“6岁左右,第一恒磨牙是最先萌出的恒牙”。近年来,英、捷、日学者报告,恒中切牙萌出先于第一恒磨牙者迅速增多,应引起口腔科医师的重视。为了探讨恒牙萌出次序的变化,1990年5～12月我们对1242名儿童恒牙萌出状况进行调查,报告如下。 对象和方法 1.调查对象为福州市某4所幼儿园及2所小学,5～7岁儿童1242名,身体健康,无全身性疾病。 So far, textbooks on the eruption of permanent teeth described as “about 6 years old, the first permanent molars is the first eruption of permanent teeth.” In recent years, Britain, Czech Republic and Japan scholars reported that the eruption of permanent central incisors increased rapidly before the first permanent molars, which should be paid more attention by dentists. In order to explore the changes of the order of eruption of permanent teeth, from May to December 1990, we investigated the eruption of 1242 children's permanent teeth and reported the following. Subjects and methods 1. The survey was conducted in 4 kindergartens and 2 primary schools in Fuzhou, 1,242 children aged 5 to 7 years old, with good health and no systemic diseases.