Summary. Out of 431 adults who had teeth root‐filled in the dental school during the period 1963–1969, 238 (55 per cent) attended for re‐examination in 1980. The patients who attended had a mean age of 53 years in 1980, and had 2.8 root‐filled teeth before treatment and 3.9 after treatment in the 1960s. In 1980, they had on average 3.7 root‐filled teeth. The percentage of root‐filled teeth increased from 12 per cent in the youngest age group (26–35 years) to 27 per cent in the oldest age group (66–75 years). Approximately 20 per cent of patients had more root‐filled teeth in 1980 than after treatment in the teaching clinic, while 7 per cent had lost all their endodontically treated teeth. Of teeth recorded as root‐filled after the last course of treatment in the school, 83 per cent were still present in 1980 (100 per cent in the youngest age group, and 78 per cent in the oldest). This age‐related difference in survival of root‐filled teeth is considered to be caused by non‐endodontic factors.
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Molven et al. (1985) studied this question.