A long-term epidemiological study of dental caries prevalence in institutionalized mentally retarded individuals. Findings at admission II.:Findings at Admission II

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• Epidemiological analyses were performed on the prevalence of dental caries among the 1107 subjects at the time they were admitted to the Niigata Prefectural Institute of Total Traning for the Mentally Retarded, Colony Niigata Shiroiwa-no-Sato, during the years 1971-1988. Statistical analyses were done using a data base which was constructed from examination records in which caries was graded according to the four-grade diagnostic standard.<BR>(1) The tooth DMF rate was 22.0-31.4 % for the 15-19-year-old age groups for the periods 1971-1975, 1976-1981 and 1982-1988, and was calculated to reach more than 50% at the end of the subjects' 40s for the period 1982-1988, gradually increasing with age and time. Changes in the tooth mortality rate and the tooth fatality rate due to dental caries in all subjects in their 30s were 18.1, 26.1, and 27.8%, and 51.7, 62.6, and 53.6%, respectively, for the periods 1971-1975, 1976-1981, and 1982-1988. The changes in these two indices in the 15-19-year-olds were on the decrease: 6.0, 4.5, and3.1%, and 23.1, 16.8, and 11.7%, respectively. The treated tooth rate and the restorative index were designated for all the age groups on the basis of the values determined for the 15-19-year-old group. These were 8.9, 15.2, and 16.8%, and 41.8, 62.2, and 69.9% in 1971-1975, 1976-1981, and 1982-1988, respectively.<BR>In comparison to the averages of all Japanese, the rate of tooth loss was higher among our subjects up to the present. As a result, the rate of tooth treatment is proportionally diminished. There was not a great difference in the rate of occurrence of dental caries.<BR>(2) Though there was a considerable difference between males and females in dental caries prevalence in 1971-1975, it disappeared in 1982-1988, showing early signs of fading in 1976-1981.<BR>(3) There was no difference in dental caries prevalence between the profound to severely retarded and the moderately retarded who could be institutionalized. Even when the degree of mental retardation influenced dental caries prevalence it played a role that was less influential than that of dental care service; it did not directly correlate with cavity formation.<BR>(4) The Occurrence of dental caries showed no fluctuation in females and was on a very gradual increase in males in these 17 years. The rate of treated cavities rapidly increased. Therefore, there was a corresponding decrease in untreated and lost teeth.

• 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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