昭和40年度熊本県下小都市・農・山・漁村の学童う歯についての調査研究

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Ratios of caries incidence per head in children living in minor cities, and villages in rural district, mountain, and coast in Kumamoto Prefecture were investigated by the use of “Records of Oral Examinations, 1965” of 11, 704 pupils (_??_ 5, 907, _??_ 5, 797) in 30 primary schools, chiefly concerning the affected permanent first molars. In this statistics, all six-year-molars that had been attacked by caries were counted regardless of their being treated or non-treated, or slightly or severely affected, and when there was a single affected first molar in an oral cavity or four (upper, lower, right, and left), it was equally counted as one.<BR>1. Observation by district: The highest ratio of the carious six-year-molars in primary school pupils by districts was unexpectedly that of the pupils in mountain villages, followed in the order by minor cities, farming villages and fishing villages. In Kumamoto Prefecture as a whole, there was little difference between the ratios in Kumamoto City and minor cities. Also, very little difference was observable in a more detailed comparison between the ratios in the agricultural areas in Kumamoto City and those in simple farming villages in rural districts. In short, the number of children having carious permanent first molars has already increased to high ratios all over the prefecture without distinction between rural and urban districts.<BR>2. Frequency of caries attack on the permanent first molars in pupils in the abovementioned minor cities and villages was observed in relation to their chronological ages, with the result that the higher the ratio of caries incidence per head of the district, the larger the number of permanent first molars attacked by caries during the first few years in the primary school. This fact seems to be a general principle.<BR>3. Observation of the relation between the six-year-molar caries incidence rates and the year of entrance to school was made in children in simple farming villages. While the percentage of children having caries-attacked first molar among the 1st Graders of the year 1960 was 12.98%, that of those in 1965 was 19.86%, that is, increase of 6.88% (1.53 times) during the six years. In other words, the ratios in the 1st Graders has shown approximately 1.0% of increase every year. Furthermore, number of the affected first molars in all graders increase year after year as they grew up, showing parallel ascending curves. This phenomenon is similar to those in children in Kikuchi City and Kumamoto City described in the previous report.
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昭和40年度熊本県下小都市・農・山・漁村の学童う歯についての調査研究

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