Essentially, root fillings are performed to preserve natural teeth. Over time, however, some root-filled teeth will inevitably be extracted. The aim of this historical prospective cohort study in the adult Swedish population was to identify factors associated with extractions within 5 y of registration of a root filling. The cohort consisted of all those whose root fillings had been reported to the tax-funded Swedish Social Insurance Agency (SSIA) in 2009. Demographic data on the individuals registered with a root filling (sex, age, country of birth, disposable income, educational level, and marital status) were received from Statistics Sweden or the SSIA. Dental care setting, tooth type, and any registration of subsequent restorations within 6 mo were received from the SSIA. Multivariable regression analysis was used, and P < 0.05 was considered statistically significant. In total, 216,764 individuals had been registered with at least 1 root filling. Individuals (n = 824) without complete data were excluded from the analyses. After 5 y, 9.3% of the root-filled teeth had been registered as extracted. Logistic regression analysis found significant associations for all variables except country of birth, disposable income, and educational level. The highest odds ratios for extractions were associated with the type of restoration: teeth with no registration of any restoration and teeth with a direct restoration combined with a post were 3 times more likely to undergo extraction than teeth restored with an indirect restoration combined with a post and core. Overall, high odds ratios for extractions were associated with any type of composite restoration, including composite fillings and crowns combined with or without any post. In summary, after root filling in the Swedish adult population, several individual- and tooth-specific variables were associated with extraction. The reasons for the extractions remain to be studied further.

Objectives: Root-fillings are essentially performed to preserve natural teeth. However over time some root-filled teeth will be extracted. The aim of this study was to identify factors associated with extractions within a period of 5 years after completion of a root-filling in the adult Swedish population. Methods: In this registry study, the cohort consisted of all root-fillings reported to the tax-funded Swedish Social Insurance Agency (SSIA) during 2009. Tooth type, any registration of subsequent coronal restorations within 6 months and type of caregiver were recorded. Demographic data (gender, disposable income, age, educational level, civil status and country of birth) were received from Statistics Sweden or the SSIA. Statistical analyses included chi-square test, t-test and logistic regression analysis. P<0.05 was considered statistically significant. Results: The total number of individuals registered with at least one root-filling was 216,764. Not all had a registration of a tooth number or had no registrations at Statistics Sweden (n=824) and were excluded from the analyses. After 5 years, 9.4% of the teeth had been registered as extracted. Preliminary data showed risk factors associated with higher odds for extractions to be molar teeth, teeth with no registration of any permanent coronal restoration within 6 months following the registration of the root-filling, root-fillings performed in the private sector, women, older age-group and widow(er)s or divorcees. Conclusions: Several individual and tooth specific factors were associated with extraction following root-filling in the Swedish adult population. The direct reasons for the extractions remain to be studied further.

AIM: To study the demographics of Swedish adults who had received a root filling, followed by extraction during the following 5-6 years in comparison with subjects who had undergone a corresponding root filling with an uneventful outcome. METHODOLOGY: The root filled maxillary first molar was chosen as the comparison model. The Swedish Social Insurance Agency provided data on all teeth reported as root filled in Sweden during 2009. A comparison group, equally large as the study group, was constructed by randomly selecting subjects with root filled maxillary first molars, which had not subsequently been extracted, that is, an uneventful outcome. Demographic data on the subjects were obtained from Statistics Sweden: country of birth, disposable income, educational level, age, civil status and gender. Chi-square, t-tests and logistic regression were used for statistical analyses. RESULTS: In the year 2009, 36 139 maxillary first molar teeth were reported to have been root filled, 4362 (12.1%) of which were then recorded as extracted during the following 5-6 year period. Only minor intergroup differences were noted: 86.5% of the study group were Swedish-born, compared with 84.4% of the comparison group (P = 0.007). Women comprised 53.2% of the study group and 50.5% (P = 0.01) of the comparison group. There was an association between extractions and gender as well as age; men had a lower odds ratio (OR) for extraction OR, 0.87; confidence interval (CI), 0.80-0.95. For every additional year, the chance for extraction was higher OR, 1.01; CI, 1.01-1.01. No other significant differences were detected. CONCLUSIONS: There was only little or no demographic differences between the study group, comprising Swedish adults who had undergone root filling of one of their maxillary first molars in 2009 and subsequent extraction during the following 5-6 years, and the comparison group, with uneventful outcomes after a corresponding root filling.

Objectives: To study some demographic variables of individuals registered receiving a root canal filling in a tooth that during the subsequent 5 to 6 years was registered as being extracted in comparison of individuals retaining the equivalent root-filled tooth during the same period.Methods: Data from the Swedish Social Insurance Agency were analyzed regarding all teeth that were reported root-filled in Sweden during 2009. The upper first molars were chosen to be a model for the comparisons. A control group was constructed by randomly selecting individuals with upper first molars not extracted. Demographical data on the individuals were received from Statistics Sweden and the groups were studied in regard to gender, age, ethnicity, mean income, educational level and civil status.Results: During 2009 a total of 36,139 upper first molars was registered as being root-filled and during the subsequent 5 to 6 years 4,362 (12.9%) of these teeth were registered as being extracted. The studied demographic variables were almost equal between the individuals who had their root-filled teeth extracted and the individuals in the control group who retained their root-filled teeth. The individuals extracting was in average older (52.7 years) than those retaining (51.1 years). A larger percentage of women (51.8) than men (48.2) was found in the group whose teeth were extracted.Conclusions: Demographic variables differed somewhat in regard to gender and age in individuals extracting root-filled upper first molars compared to individuals retaining their teeth. In regard to ethnicity, mean income, educational level and civil status only minor differences were detected.