Incidence of tooth loss and dental caries in 60-, 70- and 80-year-old Swedish individuals.

The retention of natural teeth among the elderly is increasing and, in recent studies, dental caries has been identified as the main reason for teeth being extracted. The 5-year incidence of tooth loss and dental caries and the most crucial dental factors for tooth extraction were studied in a random sample of 60-, 70- and 80-year-old inhabitants of Gothenburg. Of the 208 persons examined at baseline, 148 (71%) participated in the follow-up examination: 69, 51 and 28 respectively in the different age groups. In all, 110 teeth had been extracted during the period in 40% of the participants. Only 9 persons had lost three or more teeth. The mean numbers of remaining teeth were 22. 18 and 15 respectively in the 60-, 70- and 80-year age groups and the mean numbers of teeth lost during the 5-year period increased with age from 0.4 in the 60-year-olds to 0.8 and 1.4 in the 70- and 80-year-olds (P < 0.05). The major reason for tooth extraction was dental caries and it was found in 60% of all cases and at a higher rate of 77% in the oldest age group. Fifty-one per cent had developed new coronal carious lesions and 61% had new root carious lesions, while 27% had not developed caries during the period. The mean 5-year increment in decayed and filled coronal surfaces increased with age from 2.3 in the 60-year-olds to 3.7 and 5.3 in the 70- and 80-year-olds (N.S.I. The increment in decayed and filled root surfaces was higher in women than men, 3.4 compared with 1.8 (N.S.), which also increased with age from 1.4 in the 60-year-olds to 2.4 and 5.5 in the 70- and 80-year-olds (P < 0.0001). It was concluded from this study that few teeth had been lost during the 5-year period but that dental caries still appeared to be a serious problem among some very elderly people.