广州市儿童下切牙和第一恒磨牙萌出情况调查中山医科大学口腔系林焕彩，张和光，扬军英市耒敦辛等［１］报告日本儿童下颌恒中切牙的萌出有提早趋势。而Ｈｏｆｆｄｉｎｇ［２］报告当代日本儿童恒牙的萌出时间普遍早于１９３４年的调查结果。为了解广州市儿童下恒切牙（主... Guangzhou Children under the incisors and the first permanent molars eruption Survey Department of Oral Department of Zhongshan Medical University Lin Huancai, Zhang Heguang, Yang Junying 耒 Dun Xin et al [1] Japanese children's mandibular constant incisors have an earlier trend of eruption. Hoffding [2] reported that the eruption time of contemporary Japanese children's permanent teeth was earlier than that of 1934. In order to understand the Guangzhou children under the constant incisor ...