University of Oulu

Koskela, S., Vehkalahti, M. M., Suominen, A. L., Huumonen, S., & Ventä, I. (2022). Retained dental roots of adults: A nationwide population study with panoramic radiographs. European Journal of Oral Sciences, 130(3).

Retained dental roots of adults : a nationwide population study with panoramic radiographs

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Author: Koskela, Sanna1,2; Vehkalahti, Miira M.1; Suominen, Anna L.3,4,5;
Organizations: 1Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
2Department of Oral and Maxillofacial Diseases, Helsinki University Hospital, Helsinki, Finland
3Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
4Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland
5Department of Public Health and Welfare, Finnish Institute for Health and Welfare, Helsinki, Finland
6Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
7Research Unit of Oral Health Sciences, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.3 MB)
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Language: English
Published: John Wiley & Sons, 2022
Publish Date: 2022-11-02


The aim of this study was to assess the occurrence and nature of retained dental roots and their associations with demographics in the Finnish adult population. From the cross-sectional nationwide Health 2000 Survey of the Finnish population aged 30 years and older, 6005 participants with clinical oral examination and panoramic radiographs were included. Occurrence and characteristics of all retained dental roots were examined. Statistical analyses included χ2, Kruskal–Wallis and Mann–Whitney U tests, and SAS-SUDAAN calculations. The mean age of the 6005 participants (46% men and 54% women) was 53 (SD 14.6) years. At least one retained dental root was observed in 13% (n = 754) of the participants. The 1350 retained roots included 461 (34%) roots retained entirely in bone and 889 (66%) partly in bone. The most common location of a retained dental root was the third molar region. Occurrence of retained roots partly in bone was associated with male sex and lower education. Occurrence of retained third molar roots entirely in bone was associated with female sex, younger age, higher education, and living in a city. Among all retained dental roots, the preponderance of third molars emphasized the demanding nature of extracting the third molar in women.

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Series: European journal of oral sciences
ISSN: 0909-8836
ISSN-E: 1600-0722
ISSN-L: 0909-8836
Volume: 130
Issue: 3
Article number: e12862
DOI: 10.1111/eos.12862
Type of Publication: A1 Journal article – refereed
Field of Science: 313 Dentistry
Funding: We acknowledge Planmeca Oy (Helsinki, Finland) for providing the digital panoramic x-ray apparatus and software. This study formed part of the Health 2000 health examination survey organized by the Finnish Institute for Health and Welfare which was supported in part by the Finnish Dental Society Apollonia and the Finnish Dental Association. We thank Mika Mattila DDS and Kari Soikkonen DDS, PhD for their participation in interpretation of the radiographs. The authors received no funding for the study. Field surveys in 2000 were funded by the Finnish Institute for Health and Welfare (THL), the Finnish Dental Society Apollonia, and the Finnish Dental Association.
Copyright information: © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.