Variations in number and morphology of permanent teeth in 7-year-old Swedish children.
Variations in number and morphology of permanent teeth in 7-year-old Swedish children.
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DOI：
10.1046/j.1365-263x.2001.00205.x
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发表时间：
2001-01-01
影响因子：
3.8
通讯作者：
Wahlin, Y B
中科院分区：
文献类型：
--
作者：
Backman, B;Wahlin, Y B
目的：确定瑞典7岁儿童恒牙数量和形态变异的患病率，并接受或拒绝瑞典北方儿童恒牙数量和形态变异患病率高于其他地区的假设。1976年，在瑞典北方的于默奥市，共有739名健康的高加索7岁儿童。结果：缺牙（不包括第三磨牙）的患病率女孩为8.4%，男孩为6.5%，男女合计为7.4%。在缺牙儿童中，大多数（90.9%）缺少一个或两个牙齿。下第二前磨牙是最常缺失的牙齿。多生牙的患病率为1.9%; 11名女孩和3名男孩受到影响; 78%的多生牙是近中密牙。在形态变异中，0.8%的儿童出现桩形上侧切牙，0.3%的儿童出现双形成（成对），0.3%的儿童出现牛齿畸形，6.8%的儿童出现内陷齿。一个诊断被发现在18%的儿童，并在近8%的人超过一个诊断被发现。结论：结果同意在类似的人群中获得的，并被认为是这个种族群体的代表。在研究人群中，遗传决定的数量和形态变异发生率较高的假设未得到验证。
OBJECTIVES: To establish the prevalence of numerical and morphological variations of permanent teeth in Swedish 7-year-olds and to accept or reject the hypothesis of a higher prevalence for these conditions in northern Sweden compared to other areas.DESIGN: Cross-sectional.SETTING: Department of Odontology/Pedodontics, Umea University, Sweden.SAMPLE AND METHODS: A total of 739 healthy Caucasian 7-year-olds residing in the city of Umea, northern Sweden in 1976. The children were examined clinically and radiographically.RESULTS: The prevalence of hypodontia (excluding third molars) in girls was 8.4%, in boys 6.5%, and in both sexes combined 7.4%. Of the children with hypodontia, the majority (90.9%) lacked one or two teeth. Lower second premolars were the teeth most frequently missing. The prevalence of hyperdontia was 1.9%; 11 girls and three boys were affected; 78% of the supernumerary teeth were mesiodenses. Of the morphological variations, peg-shaped upper lateral incisors were found in 0.8% of the children, double-formation (gemination) in 0.3%, taurodontism in 0.3% and dens invaginatus in 6.8%. One diagnosis was found in 18% of the children, and in almost 8% of them more than one diagnosis was found.CONCLUSIONS: The results agree with those obtained in similar populations and are considered representative of this ethnic group. The hypothesis of a genetically determined higher prevalence of numerical and morphological variations in the study population was not verified.