Assessment of the Prevalence of Radix Entomolaris and Distolingual Canal in Mandibular First Molars in 15 Countries: A Multinational Cross-sectional Study with Meta-analysis

Hatipoğlu F.P. Mağat G. Hatipoğlu Ö. Al-khatib H. Elatrash A.S. Abidin I.Z. Kulczyk T. Ahmed Mohamed Alkhawas M.-B. Buchanan G.D. Kopbayeva M. Surendar S., BDS, MDS Javed M.Q. Madfa A.A. Bürklein S. Mimica S. Bhatti U.A. Maratovna T.I. Palma P.J. Brochado Martins J.F.
October 2023 Elsevier Inc.

Journal of Endodontics
2023 #49 Issue 10 1308 - 1318 pp.

Aim: The aim of this study was two-folded: i) to assess the prevalence of Distolingual Canal (DLC) and Radix Entomolaris (RE) in Mandibular First Molars (M1Ms), using Cone Beam Computed Tomography (CBCT) images and ii) to assess the impact of sociodemographic factors on the prevalence of these conditions worldwide. Methods: CBCT images were scanned retrospectively and the ones including bilateral M1Ms were included in the study. The evaluation was performed by 1 researcher in each country, trained with CBCT technology. A written and video instruction program explaining the protocol to be followed step-by-step was provided to all observers to calibrate them. The CBCT imaging screening procedure consisted of evaluating axial sections from coronal to apical. The presence of DLC and RE in M1Ms (yes/no) was identified and recorded. Results: Six thousand three hundred four CBCTs, representing 12,608 M1Ms, were evaluated. A significant difference was found between countries regarding the prevalence of both RE and DLC (P <.05). The prevalence of DLC ranged from 3% to 50%, and the overall prevalence was 22% (95% CI: 15%–29%). RE prevalence ranged from 0% to 12%, and the overall prevalence was 3% (95% CI: 2%–5%). There were no significant differences between left and right M1Ms or between genders for either DLC or RE (P >.05). Conclusion: The overall prevalence of RE and DLC in M1Ms was 3% and 22%. Additionally, both RE and DLC showed substantial bilaterally. These variations should be considered by endodontic clinicians during endodontic procedures in order to avoid potential complications.

CBCT , Distolingual canal , Endodontics , Prevalence , Radix entomolaris , Root canal anatomy

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Department of Endodontics, Nigde Omer Halisdemir University, Niğde, Turkey
Faculty of Dentistry, Department of Oral Radiology, Necmettin Erbakan University, Konya, Turkey
Department of Restorative Dentistry, Nigde Omer Halisdemir University, Niğde, Turkey
Private Practice, Aljarrah Dental Care, Irbid, Jordan
Faculty of Dentistry, Department of Conservative Dentistry and Endodontics, Libyan International Medical University, Benghazi, Libya
Department of Restorative Dentistry, International Islamic University Malaysia (IIUM), Kuala Lumpur, Malaysia
Department of Diagnostics, Poznan University of Medical Sciences, Poznan, Poland
Faculty of Dental Medicine, Department of Endodontic, Al-Azhar University, Cairo, Egypt
Department of Odontology, School of Dentistry, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
Kazakh National Medical University Asfendiyarov, Kazakhstan
Department of Conservative Dentistry and Endodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Tamil Nadu, Chennai, India
Department of Conservative Dental Sciences and Endodontics, College of Dentistry, Qassim University, Qassim, Buraydah, Saudi Arabia
Department of Restorative Dental Science, College of Dentistry, University of Hail, Hail, Saudi Arabia
Department of Conservative Dentistry, Faculty of Dentistry, Thamar University, Dhamar, Yemen
Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, Münster, Germany
Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Department of Operative Dentistry and Endodontics, Riphah International University, Islamabad, Pakistan
Department of Therapeutic Dentistry, Kazakh National Medical University Asfendiyarov, Almaty, Kazakhstan
Center for Innovation and Research in Oral Sciences (CIROS), Faculty of Medicine, University of Coimbra, Coimbra, Portugal
Institute of Endodontics, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
Private Practice Limited to Endodontics, Amsterdam, Netherlands

Department of Endodontics
Faculty of Dentistry
Department of Restorative Dentistry
Private Practice
Faculty of Dentistry
Department of Restorative Dentistry
Department of Diagnostics
Faculty of Dental Medicine
Department of Odontology
Kazakh National Medical University Asfendiyarov
Department of Conservative Dentistry and Endodontics
Department of Conservative Dental Sciences and Endodontics
Department of Restorative Dental Science
Department of Conservative Dentistry
Central Interdisciplinary Ambulance in the School of Dentistry
Department of Endodontics and Restorative Dentistry
Department of Operative Dentistry and Endodontics
Department of Therapeutic Dentistry
Center for Innovation and Research in Oral Sciences (CIROS)
Institute of Endodontics
Private Practice Limited to Endodontics

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