Logo-ajdr
Submitted: 23 Nov 2024
Revision: 18 Jan 2025
Accepted: 20 Jan 2025
ePublished: 30 Jun 2025
EndNote EndNote

(Enw Format - Win & Mac)

BibTeX BibTeX

(Bib Format - Win & Mac)

Bookends Bookends

(Ris Format - Mac only)

EasyBib EasyBib

(Ris Format - Win & Mac)

Medlars Medlars

(Txt Format - Win & Mac)

Mendeley Web Mendeley Web
Mendeley Mendeley

(Ris Format - Win & Mac)

Papers Papers

(Ris Format - Win & Mac)

ProCite ProCite

(Ris Format - Win & Mac)

Reference Manager Reference Manager

(Ris Format - Win only)

Refworks Refworks

(Refworks Format - Win & Mac)

Zotero Zotero

(Ris Format - Firefox Plugin)

Avicenna J Dent Res. 2025;17(2): 109-117.
doi: 10.34172/ajdr.2165
  Abstract View: 40
  PDF Download: 4

Original Article

How Common Are the Anatomical Anomalies of Mandibular Molars in an Iranian Subpopulation? A Cone-Beam Computed Tomography Assessment

Shamsodin Heydari 1 ORCID logo, Behnam Bolhari 1, Foozie Zahedi 2* ORCID logo, Shima Younespour 3

1 Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
2 Radiology Department, School of Dentistry, Dental Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
3 Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
*Corresponding Author: Foozie Zahedi, Email: dr.fooziezahedi@gmail.com

Abstract

Background: Information about root canal anatomical variations is important for successful root canal treatment. This study assessed the frequency of common anomalies of permanent mandibular first and second molars using cone-beam computed tomography (CBCT).

Methods: In this cross-sectional study, 505 CBCT scans were evaluated by an oral radiologist and an endodontist to determine the presence/absence of the mid-mesial canal, the C-shaped canal configuration and its type, the third root and its type, taurodontism and its percentage, and dilaceration and its degree. To assess intra- and inter-observer agreements, all CBCT scans were evaluated twice at a one-week interval by both observers. The data were analyzed using the kappa coefficient and univariate logistic regression.

Results: The kappa values showed acceptable inter-observer (0.780) and intra-observer (0.983) agreements. Of all, 21 teeth (4.17%) had a mid-mesial canal, 20 teeth (3.96%) had a third root, and 38 teeth (7.52%) had a C-shaped canal. The frequency of the third root (P=0.01) and C-shaped canal (P<0.000) in mandibular second molars was significantly higher than that in mandibular first molars (P<0.000). Taurodontism was detected in 6 teeth (1.19%), while root dilaceration was present in 162 teeth (34.23%). Age and gender had no significant association with the presence of a mid-mesial canal, third root, C-shaped canal, or dilaceration (P>0.05).

Conclusion: Mandibular first and second molars were not significantly different in the frequency of mid-mesial canal, taurodontism, and dilaceration. Considering the relatively high prevalence of dilaceration and C-shaped canals in the study population, these anatomical variations should be taken into account in root canal treatment.



Please cite this article as follows: Heydari S, Bolhari B, Zahedi F, Younespour S. How Common Are the Anatomical Anomalies of Mandibular Molars in an Iranian Subpopulation? A Cone-Beam Computed Tomography Assessment. Avicenna J Dent Res. 2025;17(2):109- 117. doi:10.34172/ajdr.2165
First Name
Last Name
Email Address
Comments
Security code


Abstract View: 30

Your browser does not support the canvas element.


PDF Download: 4

Your browser does not support the canvas element.