Cited by 142dental development and anomaliesDental Radiography and ImagingEndodontics and Root Canal Treatments

Morphologic and Demographic Predictors of Third Molar Agenesis: A Systematic Review and Meta-analysis

Carter, K., Worthington, S.·2015·Journal of Dental Research

Abstract

We aimed to consolidate all available data on worldwide third molar agenesis frequencies, with a particular emphasis on exploring the factors leading authors to find contradictory results for the demographic and morphologic predictors of this anomaly. A total of 12,376 studies were originally identified, then narrowed down to 1,312 for title/abstract screening. On the basis of our inclusion and exclusion criteria, we selected 92 studies, containing 100 effect sizes and 63,314 subjects, for systematic review and metaregression. The worldwide rate of agenesis was found to be 22.63% (95% confidence interval = 20.64% to 24.76%), although the estimates ranged from 5.32% to 56.0%. Our subgroup analyses revealed that women are 14% more likely than men to have agenesis of ≥1 third molars and that maxillary agenesis was 36% more likely than mandibular agenesis in both sexes. Furthermore, we found that having agenesis of 1 or 2 molars was most common, while agenesis of 3 or 4 molars was least common. Finally, we found large differences among agenesis frequency depending on geographic region. This information is expected to be of use not only to clinicians and patients but also to policy makers, given the implications for third molar extraction protocols.

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Crossref · 10.1177/0022034515581644

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Authors
Carter, K., & Worthington, S.
Affiliations
Harvard University (US)
Venue
Journal of Dental Research
Published
2015-04-16
Volume
94
Issue
7
Pages
886-894
ISSN
  • 0022-0345 (ISSN-L)
  • 1544-0591
OpenAlex
W1994849206
Cited by
141
References
63
Citations by year
2026: 12 · 2025: 19 · 2024: 23 · 2023: 17 · 2022: 10 · 2021: 15 · 2020: 12 · 2019: 9 · 2018: 12 · 2017: 5 · 2016: 6 · 2015: 1
FWCI
0.78
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Dental Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Science Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › dental development and anomalies
  • Health Sciences › Dentistry › Oral Surgery › Dental Radiography and Imaging
  • Health Sciences › Dentistry › Oral Surgery › Endodontics and Root Canal Treatments
Keywords
third molar agenesis, tooth agenesis, prevalence, sex differences, maxillary third molar, mandibular third molar, regional variation, third molar extraction
MeSH terms
Anodontia, Female, Humans, Male, Mandible, Maxilla, Molar, Third, Sex Factors, Logistic Models, Publication Bias

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