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融合牙属于牙齿形态异常。大致有以下几种:即乳牙与乳牙的融合,恒牙与恒牙的融合以及多生牙与恒牙的融合等。尚未见关于乳牙融合牙发生率的调查报告,笔者于1980年10月至1981年3月在南京市内选择六所幼儿园的1,000名学龄前儿童进行普查登记。男女儿童各500名,平均年龄男童4.6岁,女童4.7岁。以口腔内直视下发现牙冠融合为准。调查结果调查结果见附表。从表中可见: 27名(男13,女14)儿童共有30个融合牙(男女各15个),其中上颌1个,下颌为29个。后者中,乳尖牙与乳侧切牙融合20个(男11个,女9个),乳侧切牙与乳中切牙融合9个(男4个,女5个)。3名儿童(男2,女1)出现
Fusion teeth are abnormal tooth shape. Roughly the following types: that is, the integration of deciduous teeth and deciduous teeth, permanent teeth and permanent teeth fusion and the fusion of many raw teeth and permanent teeth. No survey on the incidence of deciduous teeth has been reported. From October 1980 to March 1981, the author selected 1,000 pre-school children in six kindergartens for census registration in Nanjing. 500 boys and girls each, with an average age of 4.6 years for boys and 4.7 years for girls. Oral cavity under the vision to find the crown fusion prevail. Survey results The findings are attached. As can be seen from the table, there are 30 fused teeth (15 male and female) in each of 27 children (13 male and 14 female), of which 1 is maxillary and 29 is mandibular. The latter, the canine and the incisor fusion 20 (11 males and 9 females), the lateral incisors and breast incisors fusion 9 (4 males and 5 females). Three children (male 2, female 1) appear