小学生における乳歯の脱落と齲蝕発病の研究

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Grade school pupils numbering 2, 873 were examined for the present study. They were from the middle class families socioeconomically residing in the Yahatanishi-ku, Kitakyushu City. Each subject was examined six times at four-month intervals by individual follow-up survey for the number of presenting deciduous teeth (t) and of caries (dft). Examinations by tooth kind and by sex were made of t, dft, -t, -dft_1, -dft_2, +dft_1 and +dft_2 rates. The teeth studied were non-fluoridized. The results were as follows : 1. The trend for a decrease in the t rate arising from an increase in shedding and caries incidence of the deciduous teeth during grade school years was more gradual for the male than for the female. 2. The -t rate (percentage of number of shed teeth in four months to t) by tooth kind for both the male and female showed a similar trend by age group in both the maxilla and mandible. The central and lateral incisors had higher rates than the other three kinds of tooth. The difference in the -t rate between the right and left sides of the maxilla and mandible was very little for both the male and female. A slight increase in the rate was indicated with aging in both sexes. The mandible showed higher rates than the maxilla for both the male and female, and the female had higher rates than the male. 3. The dft rate (dft/t), of each tooth for both the male and female levelled off with aging, and the posterior teeth showed higher rates than the anterior teeth in the difference by tooth kind in both the maxilla and mandible. As to the difference between the right and left sides of the maxilla and mandible of the male and female, the left side of the female maxilla showed higher rates than the right side but no difference was observed in the others. In the difference between the maxilla and mandible, the mandible showed higher rates for both the male and female. Between the male and female, the female had higher rates for each tooth type than the male and showed an increase in the rate with aging. 4. The +dft_1 rate (percentage of number of caries increased in four months to number of healthy teeth) decreased with aging for each tooth in the maxilla and mandible for both the male and female. Practically no difference between the right and left sides was observed in the maxilla and mandible for both the male and female. The maxilla showed higher rates than the mandible for the male and female. The female showed slightly higher rates than the male. 5. The +dft rate (percentage of number of caries incidence in four months to the number of remaining teeth in four months) decreased with aging for each tooth for both the male and female. The female left maxilla showed slightly higher rates than the right side. No practical difference was observed either between the male maxilla and mandible or between the sides of the female mandible. No significant difference was observed either between the sexes or between the maxilla and mandible. 6. The -dft_1 rate (percentage of number of shed deciduous teeth and caries to number of shed deciduous teeth) was high for each tooth in the maxilla and mandible for both the male and female. Little difference was observed between the sides of the maxilla and of mandible for both sexes. The difference between the maxilla and mandible was little for the male but the female mandible showed higher rates than the maxilla. Little difference was observed between the sexes and levelling-off of the rate was observed with aging. 7. The -dft_2 rate (percentage of number of shed to total caries) showed a slight increase with aging for each tooth in the maxilla and mandible for both sexes. As to the difference between the sides, the left side of the male mandible showed higher rates than the right side, and the left side of the female maxilla than the right side. Little difference was observed either between the maxilla and mandible for both sexes or between the sexes.
1980-01-25

小学生における乳歯の脱落と齲蝕発病の研究

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