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幼儿牙齿硬组织的某些发育缺陷,是由于胎儿期牙齿发育障碍所引起。母亲妊娠期接触有害物质,是导致胎儿牙齿发育障碍的因素之一。作者研究母亲从事化学工业生产的幼儿的乳牙情况,检查工业城市幼儿园的177例小儿,年龄1岁3月至3岁3月,男孩89例,女孩88例。基本组102例(57.6%),母亲在妊娠初期(8～10周)曾接触有Ⅱ～Ⅲ级危害的化学物质。对照组7 5例(42.4%),母亲和化学工业生产无关。研究结果,乳牙釉质发育不全的人数,基本组为52±4.9%,对照组为33.3±5.4%(P<0.05)。基本组共检查牙齿1858颗,发育不全334颗(18±0.9%),对照组共检查牙齿1331颗,发育不全126
Some of the developmental defects in young children’s hard tissues are caused by the developmental disorders of the fetus during the fetal period. Maternal exposure to harmful substances during pregnancy, is one of the factors that cause fetal tooth development disorders. The authors studied the deciduous teeth of infants who were engaged in chemical industry and examined 177 infants from 1 year old to 3 years old in industrial city kindergarten. There were 89 boys and 88 girls. The basic group of 102 patients (57.6%), mothers in the first trimester of pregnancy (8 to 10 weeks) had exposure to Ⅱ ~ Ⅲ grade hazardous chemicals. Control group, 75 cases (42.4%), the mother and the chemical industry has nothing to do. The results showed that the number of primary enamel hypoplasia was 52 ± 4.9% in the primary group and 33.3 ± 5.4% in the control group (P <0.05). In the basic group, 1858 teeth, 334 hypoplasia (18 ± 0.9%), 1331 teeth, hypoplasia 126