Analysis of dental caries in junior and senior high school students by birth-year cohort
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概要
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According to the National Survey of Dental Diseases of the Japanese Ministry of Health, Labour and Welfare, the decayed/missing/filled teeth (DMFT) index of 12-year-old Japanese children has shown a downward tendency since it peaked at 5.62 in 1975. However, this low rate of caries in 12-year-old children may indicate how the methods of the analysis may have changed. Using a birth-year cohort, we analyzed changes in the rate of dental caries in junior and senior high school students based on the above survey and examined the factors that affect the caries rate of these students, paying attention to lifestyle factors peculiar to this age group. Regression analysis showed that the DMFT index of junior and senior high school students is decreasing. Conversely, birth-year cohort analysis showed that this trend might not be a true reflection of the caries rate in students of this age. Moreover, in studying the lifestyle factors peculiar to junior and senior high school students, we found that 18-year-old males brushed their teeth fewer times each day and skipped breakfast more often compared with 12-year-old students and with students of all other ages. These results suggest that junior and senior high school students do not demonstrate healthy living behavior at a time when these habits should have already been established. To prevent future increases in dental caries among these students, environmental factors and lifestyle factors peculiar to them must be clarified. Because oral healthcare is important, it is necessary to conduct a lifestyle analysis based on objective oral health parameters such as the frequency and duration of toothbrushing.
著者
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Jin Koichiro
Department Of Preventive And Community Dentistry Osaka Dental University
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Kambara Masaki
Department Of Community And Preventive Dentisty
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Jin Koichiro
Department Of Chemistry And Biotechnology Graduate School Of Engineering The University Of Tokyo
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