At 3 rehabilitation homes for mentally disabled persons in Iwate prefecture, we investigated the prevalence of dental caries and missing teeth among the residents and the participants. The oral status was compared with National Survey of Dental Disease (1993) by age group, and intra-subjects factors were also analyzed.
The results were as follows:
1. The prevalence of dental caries among the present teeth of the subjects was similar to that found in National Survey in almost all age group.
2. The average number of missing teeth was higher among sublects than that found in National Survey in all age groups, especially in the elder groups.
3. There were significant differences in the average number of C2 and the caries treatment rate by homes.
4. There was significant difference in the average number of C4 between the residents and the porticipants. It was higher among the residents than among the participants.
5. In comparison by severity of mental disability according to political certification, there were significant differences in the average number of C2 and FT. Concerning C2,the average number arnong the subjects with the severe disability was higher than that among the subjects with the comparatively slight disability. While the average number of FT was lower among the subjects with the severe disability.
6. In comparison by the disorders complicated by mental disability, among the subjects with Down’s syndrome, the average number of missing teeth was higher than that found in the subjects without Down’s syndrome.
When some previous studies are taken into account, it is clarified that, in mentally disabled persons, the most serious problem concerning their oral condition is their tendency to lose their teeth at an earlier age than the normal. It is ako considered that the social factors related to their oral status should be investigated more extensively with regard to the findings in this study.
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