歯牙発育の地域差に関する研究
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概要
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Choosing Sapporo as representative of the cool northern part of the country, Nagoya as representative of central Japan, Kumamoto as representative of the warm south and Nagano as representative highlands, this author studied a total of 6, 655 children, 3, 429 male and 3, 226 female, at sixteen primaryand junior high schools in urban and rural communities in these areas with respect to the growth of their teeth, and at the same time measured their stature, body height, circumference of the chest and weight. For the junior high school girls, he also checked whether they are having the menses or not. Thus, he considered regional variations in dental growth in relation to body growth and phycical maturity. Neither in dental growth nor body growth nor physical maturity, and tendency toward quicker progress in the south than in the north was noted, or in lowlands than in highlands. But comparison of urban and rural areas showed that, in each of these respects, and in each region surveyed, progress is quicker in urban areas than in rural communities. This means that climatic or geographical conditions cause no great regional variations in dental growth or physical growth in this country. Much more conspicuous are variations in growth due to civilizational differences (presumably differences in dietary habits).<BR>Body growth (especially, height) and physical maturity always showed fairly parallel progress both in inter-regional comparison and in urbanrural comparison. Dental growth is generally in parallel with these, but in a lesser degree than body growth and physical maturity are with each other.