Methods:Questionnaire survey and dental check-up were executed for the 90 years old people who lived in Iwate Prefecture. The questionnaire consists of 57 items concerning lifestyle, oral hygiene, etc. The questions about lifestyle based on the Tokyo Metropolitan Institute of Gerontology (TMIG) index of competence were used.
Results:The average number of present teeth among 102 subjects was 3.36±5.91. The subjects were 41 dentulous (male: 25, female: 16) and 61 edentulous (male: 13, female: 48), and the number of dentulous subjects in male were more than in female (p<0.01). We classified the subjects into two groups (dentulous and edentulous), and analyzed the difference of lifestyle. As a result, a high level of the intellectual activity was shown in dentulous subjects was admitted (p<0.01). We examined relations between the change of the number of present teeth and ADL of 89 subjects who took the dental check-up at 85 years old. They were classified into three groups (edentulous at 85 years old: 52, edentulous before 90 years old:4, dentulous at 90 years old: 33). As a result of MANOVA and the multiple comparison test, it was shown that the total score of TMIG index of competence of the dentulous subjects was intentionally higher compared with the subjects who were edentulous at 85 years old (p<0.01).
Conclusions:It was shown that ADL of dentulous subjects was high. ADL of senior people may be able to be maintained if enough oral function will be provided. The result of this cohort survey from 80 to 90 years old will be analyzed in the future.