国民1人当り年間砂糖消費量20kg近くの時期の永久歯齲蝕のコーホート研究
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概要
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A model to show the condition of caries attack was constructed by Takeuchi with the post-eruptive tooth age as the X-axis, the annual caries incidence rate (Mx) or the cumulative number of carious teeth per initial 1, 000 healthy teeth (ΣCx) as the Y-axis, and the annual sugar consumption per person after the eruption of the tooth (p) as the Z-axis. In this model the values at the times when p was 0-15kg were the results of the physical examinations at schools in Japan, while those for 30kg were plotted from data in New Zealand. Therefore, additional data, especially concerning cohort studies in periods when p in Japan was greater than the above are desired.<BR>The material of this study consists of a part of the materials used for the author's study on the epidemiological distribution pattern of the acid resistance of the surface enamel by means of phosphorus determined by enamel biopsy, and in relation to caries incidence.<BR>The subjects for this study were children in two primary schools and a junior high school in Kameoka City, Kyoto Prefecture. The fluoride contents in the drinking water of this area had little influence on caries attack, and the living standards of the inhabitants were more or less the Japanese average. Group"A"consisted of the children in the first grade and Group"B"those in the fourth grade of the primary schools in 1965. From this year oral examinations were performed on the same individuals once a year for three years, totaling four times, and the results of these examinations were summed up to be used as data. p was 16.8kg in 1962, 18.9kg in 1965, and 21.2kg in 1967.<BR>The diagnostic standards of caries used here were more severe than the usual standards of a sticky feeling in pits and fissures and a soft feeling on smooth surfaces.<BR>In collecting, the calculations were done by the post-eruptive tooth age and by types of teeth. The results are summarized in Table 1 and Fig. 1. They show the appearance of greater influence of p compared to the cases under p=12-15kg reported by Shimizu (Fig. 2).
- 有限責任中間法人 日本口腔衛生学会の論文