Risk factors for external root resorption of maxillary second molars due to impacted third molars as evaluated using cone beam computed tomography.

Schriber, Martina; Rivola, M; Leung, Y Y; Bornstein, M M; Suter, V. G. A. (2020). Risk factors for external root resorption of maxillary second molars due to impacted third molars as evaluated using cone beam computed tomography. International journal of oral and maxillofacial surgery, 49(5), pp. 666-672. Elsevier 10.1016/j.ijom.2019.09.016

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The purpose of this retrospective study was to evaluate risk factors for external root resorption (ERR) on maxillary second molars (MxM2) in association with impacted third molars (MxM3) using cone beam computed tomography (CBCT) scans. The angles between the axes of MxM2/MxM3 (inclination) were measured. Further, ERR on MxM2 was classified as absent, slight, moderate, or severe. Contact location between MxM3 and MxM2, the size of the dental follicle, type of impaction, root formation, and patient demographic characteristics were also assessed. Half of the 84 MxM2 showed ERR (slight 36.9%, moderate 6.0%, severe 7.1%). Patient age was a significant factor for the presence of ERR (P = 0.03). The inclination was also a relevant factor, with transverse MxM3 exhibiting the highest risk of ERR (P = 0.02). The cervical third (28.6%) showed a significantly lower risk percentage of ERR compared to the apical (73.7%) and middle thirds (60.6%) of the root (P = 0.004). Based on these findings, clinicians assessing the need for surgical removal should be able to selectively identify impacted MxM3 at risk of causing ERR on MxM2 early on, especially when the MxM3 is located in close contact with the apical and middle thirds of the MxM2 roots and has a transverse inclination.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Oral Surgery and Stomatology

UniBE Contributor:

Schriber, Martina and Suter, Valérie

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1399-0020

Publisher:

Elsevier

Language:

English

Submitter:

Caroline Balz

Date Deposited:

04 Dec 2019 08:43

Last Modified:

02 Jul 2020 10:24

Publisher DOI:

10.1016/j.ijom.2019.09.016

PubMed ID:

31676229

Uncontrolled Keywords:

cone beam computed tomography maxillary third molar risk factor root resorption second molar

BORIS DOI:

10.7892/boris.135562

URI:

https://boris.unibe.ch/id/eprint/135562

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