Evidence map›Paper›PMID 40928548›Full record

ArticleOral and maxillofacial surgery2025

External root resorption of second molars caused by impacted third molars: CBCT characteristics.

Kan Wang, Jiajia Zheng, Jinghua He, Yuan Fu, Xiaoming Lyu

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Article in Oral and maxillofacial surgery, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

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0cells of the map it votes in
1citing papers in PubMed
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1 · What the graph read from it

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2 · The registry

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3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Review
4 · The record

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5 · Who and what money

Authors and funding

5 authors.

Kan Wang *Second Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology &, Biomaterials and Digital Medical Devices, National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral, Beijing, China. wangkan19891012@126.com.
Jiajia Zheng *First Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology &, Biomaterials and Digital Medical Devices, National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral, Beijing, China.
Jinghua HeDepartment of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology &, Biomaterials and Digital Medical Devices, National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral, Beijing, China.
Yuan FuFirst Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology &, Biomaterials and Digital Medical Devices, National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral, Beijing, China.
Xiaoming LyuDepartment of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology &, Biomaterials and Digital Medical Devices, National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral, Beijing, China. lxm47400914@163.com.

Funding

New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology PKUSSNKP-202120
6 · The paper itself

Abstract

objectivesThis study aims to describe the cone-beam computed tomography (CBCT) characteristics of external root resorption (ERR) in second molars associated with impacted third molars.

methodsThis study analyzed 69 s molars diagnosed with ERR caused by impacted third molars in 52 patients (age range: 22-59 years; mean age = 31.2 ± 7.1 years) to identify key factors influencing the severity and occurrence of ERR. CBCT was used to assess the relationship between impacted third molar characteristics (position, angulation, proximity) and the extent of root resorption in adjacent second molars.

resultsERR most commonly affected mandibular second molars (37 teeth: 60.0%, 47 teeth: 40.6%). Resorption extended to the pulp chamber in 47.9% of cases, while 40.6% was limited to superficial/middle dentin. 24.6% of the ERR sites were in communication with the oral cavity. 87% of impacted third molars were low-level, and 38% were completely bone-impacted. 26% had an angulation > 90° relative to the affected tooth. Complete bone impaction significantly correlated with ERR extending to the pulp chamber (65%, p < 0.05). ERR communicating with the oral cavity significantly increased pain on percussion. Younger patients were more likely to have ERR extending to the pulp chamber.

conclusionsLow-level and complete bone impactions of impacted third molars significantly contribute to the development of ERR in adjacent second molars. Communication between the ERR site and the oral cavity is associated with a high risk of infection.

Indexed as

Molar, ThirdRoot ResorptionTooth, ImpactedAdultCone-Beam Computed TomographyFemaleHumansMaleMiddle AgedRetrospective StudiesYoung AdultCone-beam computed tomography (CBCT)External root resorption (ERR)Impacted third molarSecond molar

Identifiers

PMID40928548

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.