Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Jun;100(6):608-614.
doi: 10.1177/0022034520982962. Epub 2021 Jan 5.

Factors Associated with Extraction following Root Canal Filling in Adults

H Fransson  1   2 , L Bjørndal  3 , F Frisk  2   4 , V S Dawson  1 , K Landt  1 , P-E Isberg  5 , EndoReCo  6 , T Kvist  2
Affiliations

Factors Associated with Extraction following Root Canal Filling in Adults

H Fransson et al. J Dent Res. 2021 Jun.

Abstract

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.

Keywords: demography; endodontics; permanent dental restoration; root canal therapy; tooth extraction.

PubMed Disclaimer

Conflict of interest statement

Declaration of Conflicting Interests: The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

References

    1. Afrashtehfar KI, Ahmadi M, Emami E, Abi-Nader S, Tamimi F. 2017. Failure of single-unit restorations on root filled posterior teeth: a systematic review. Int Endod J. 50(10):951–966. - PubMed
    1. Albrektsson T, Wennerberg A. 2005. The impact of oral implants—past and future, 1966–2042. J Can Dent Assoc. 71(5):327. - PubMed
    1. Bjørndal L, Laustsen MH, Reit C. 2006. Root canal treatment in Denmark is most often carried out in carious vital molar teeth and retreatments are rare. Int Endod J. 39(10):785–790. - PubMed
    1. Collares K, Opdam NJ, Peres KG, Peres MA, Horta BL, Demarco FF, Correa MB. 2018. Higher experience of caries and lower income trajectory influence the quality of restorations: a multilevel analysis in a birth cohort. J Dent. 68:79–84. - PubMed
    1. Dawson VS, Petersson K, Wolf E, Åkerman S. 2016. Periapical status of root-filled teeth restored with composite, amalgam, or full crown restorations: a cross-sectional study of a Swedish adult population. J Endod. 42(9):1326–1333. - PubMed

Publication types

LinkOut - more resources