A long-term epidemiological study of dental caries prevalence in institutionalized mentally retarded individuals. Length of stay and the tooth DMF rate.:Length of Stay and the Tooth DMF rate
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概要
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Epidemiological analyses of tooth DMF rate and 4 related indices in connection with the length of their stay, were performed on 948 subjects who received dental examinations after the initial admission examination. They were among a group of 1107 mentally retarded individuals who were admitted to the Niigata Prefectural Institute of Total Training for Mentally Retarded, Colony Niigata Shiroiwa-no-Sato during the years 1971-1988.<BR>(1) The 948 subjects were categorized into 3 groups on the basis of the length of stay: 1-5 years, 6-10 years, and 11 years and longer. The tooth DMF rate showed a tendency to increase with age and had values in the range of 24.3-64.5%, in the ages between 15 and 49 years in all 3 groups. The tooth mortality rate (TMR) and the tooth fatality rate due to dental caries (TFR) exhibited a tendency to increas with age but had fluctuations based on the age group. TMR and TFR were between 3.1-39.7% and 10.9-70.7%, respectively, in all 3 of the groups. The treated tooth rate (TTR) and the restorative index (RI) was approximately the same with age in all 3 of the groups and rose slightly as the length of stay increased. These two indices were in the ranges of 13.6-43.2% and 57.3-100.0%, respectively.<BR>(2) The difference in the tooth DMF rate by sex was recognized in stays longer than 11 years in the 1971-1975 newcomers (p<0.001). Females had a higher index than males in the tooth DMF rate, TMR, TTR, and RI. These were independent of the period of admission. The difference in TMR was greater in the length of stay between 6-10 years (p<0.05) and disappeared after that. There was no recognizable difference in TFR based on the admission time of subject. A difference in TTR was recognizable in stays longer than 11 years (p<0.001) but a difference in RI was not. Differences in the tooth DMF rate, TMR, and TTR by sex in 1976-1981 newcomers existed 1-5 years after admission but these differences disappeared after that. No difference was noted after 1-5 years of stay in 1982-1988 newcomers.<BR>(3) Although a decrease was found in males and an increase was found in females, there was almost no significant difference in the tooth DMF rate in comparison to the newcomers of the same ages admitted at the time of examination. Increases in TTR and RI were remarkable. Decreases in TMR and TFR were seen in males as their length of stay increased.<BR>(4) In comparison to the averages of all Japanese, studied in the Survey of Dental Diseases taken by the Ministry of Health and Welfare, the tooth DMF rate was almost equal in males and was lower in females. Higher values in TMR were found than in the Survey. Increases in TTR and RI were also higher in relation to the length of stay in the institute.
- 有限責任中間法人 日本口腔衛生学会の論文
有限責任中間法人 日本口腔衛生学会 | 論文
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