Restor Dent Endod.  2022 Nov;47(4):e39. 10.5395/rde.2022.47.e39.

The prevalence and characteristics of external cervical resorption based on cone-beam computed tomographic imaging: a cross-sectional study

• Ferreira MD
• Barros-Costa M
• Costa FF
• Freitas DQ

• KMID: 2548143
• DOI: http://doi.org/10.5395/rde.2022.47.e39

Abstract

Objectives
This study investigated the prevalence and characteristics of external cervical resorption (ECR) regarding sex, age, tooth, stages of progression, and portal of entry, using cone-beam computed tomography (CBCT) scans.
Materials and Methods
CBCT scans of 1,313 patients from a Brazilian subpopulation comprising 883 female and 430 male patients (mean age, 55.2 years), acquired using a PreXion 3D CBCT unit, were evaluated. All permanent teeth included in the scans were evaluated for the presence of ECR according to the 3-dimensional classification and the portal of entry. The association between the presence of ECR and the factors studied was assessed using the χ² test. Intra-observer agreement was analyzed with the kappa test (α = 0.05).
Results
In total, 6,240 teeth were analyzed, of which 84 (1.35%) were affected by ECR. A significant association was found between the presence of ECR and sex, with a higher prevalence in male patients (p = 0.002). The most frequently affected teeth were the mandibular and maxillary central incisors. The most common height was the mid-third of the root. For the portal of entry, 44% of cases were on the proximal surfaces, 40.5% on the lingual/palatal surface and 15.5% on the buccal surface. Intra-observer agreement was excellent.
Conclusions
The prevalence of ECR was 1.35%, with a higher prevalence in male patients and a wide age distribution. The mandibular and maxillary central incisors were the most commonly affected teeth, and cases of ECR most frequently showed a height into the midthird of the root and proximal entry.

Keyword

Cone-beam computed tomography; External cervical resorption; Root resorption

Figure

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  Figure 1 Flowchart showing the sample selection process.

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  Figure 2 Examples of external cervical resorption indicated by white arrows. (A, B) Classification 1Ad. (C, D) classification 2Bd. (E, F) classification 3Ap. (G, H) classification 4Ap, according to the 3-dimensional classification.

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  Figure 3 Examples of the portal of entry of external cervical resorption lesions indicated by white arrows. (A) buccal, (B) proximal, (C) palatal.

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