台湾人幼児の乳歯列の咬合および形態に関する研究
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概要
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This study describes the condition of teeth disposition and occlusion, and the traits of deciduous dental arch in children living in the middle region of Taiwan. One hundred and seventy-eight Taiwanese children (96 boys and 82 girls) 3 to 5 years old had impression taken and plaster models made. Fifty-eight percent or more male and female Taiwanese children had normal occlusion. Of the children with malocclusion, the percentage having upper protrusion was highest (16.9%), and the percentage of children having overbite, edge to edge bite, open bite, anterior cross bite and cross bite was 12.4, 5.1, 4.5, 2.2 and 0.6%, respectively. In upper and lower jaws, the percentage of children showing the mixed type of primate space and developmental space was highest, but the percent of children showing the type of only developmental space was lowest in both boys and girls. The percentage of children showing bilateral vertical type of terminal plane was highest, 53.1% in the boys and 51.9% in the girls, followed in order by vertical-mesial step type, and bilateral mesial step type. Under 5% of the children had bilateral distal step type, vertical-distal step type or mesial-distal step type. Both upper and lower dental arch lengths tended to be longer in boys than in girls, although the difference was not significant except for upper anterior dental arch length in 3-year-old children. Upper anterior dental arch length was significantly shorter (p<0.01) in 5-year-old boys than in 3-year-old boys, and upper posterior dental arch length was also significantly shorter (p<0.05) in 5-year-old boys than in 4-year-old boys. The dental arch breadth measurements, including all the measurements were significantly greater (p<0.01, 0.05) in boys than in girls. The dental arch breadths tended to be greater with age. Especially, the breadth measurements, including measurements between 2nd deciduous molars in the upper jaw was significantly greater (p<0.05) in 5-year-old boys than in 3-year-old boys. In 3-year-old children, anterior-posterior dental arch length index and anterior dental arch index in the upper jaw were significantly higher (p<0.05) in boys than in girls. However, in 5-year-old children, posterior dental arch index in the upper jaw was significantly lower (p<0.01) in boys than in girls. These indices in the upper jaw tended to decrease with age. In the lower jaw, all the indices were similar between boys and girls, and between 3, 4 and 5-year-old children. When compared with Japanese children, the length of deciduous dental arch was similar but breadth was greater in Taiwanese children.
- 九州歯科学会の論文
- 1989-08-25