Prevalence of C-shaped canal system in mandibular first and second molars in a Saudi population assessed via cone beam computed tomography: a retrospective study
The purpose of this study was to determine the prevalence of the C-shaped root canal configuration, location of the longitudinal groove, sex differences, and unilateral/bilateral presence in mandibular first and second molars in a Saudi population using cone beam computed tomography (CBCT).
Materials and methods
CBCT images for the mandibular first and second molars of 487 patients (a total of 529 first molars and 681 s molars) were evaluated. The teeth were assessed for the presence of C-shaped root canals according to Fan criteria. Subdivisions were also made according to sex, direction of the longitudinal groove, and unilateral/bilateral presence.
Only one C-shaped mandibular first molar was observed (0.19%), whereas 62 second molars (9.1%) exhibited C-shaped anatomy. Unilateral presence of the C-shaped root canal system was more common (53.85%). Female patients had a higher prevalence than males. Longitudinal grooves were most commonly found on the root lingual surface (58.1%).
The prevalence of the C-shaped canal configuration in a Saudi Arabian population was 0.19% in the mandibular first molar and 9.1% in the mandibular second molar. Longitudinal groove prevalence was highest on the lingual surface. Women had a significantly higher prevalence of the C-shaped canal configuration than men. Patients with unilateral presence of the C-shaped canal configuration were more common than those with bilateral presence.
Tooth type, patient sex, and ethnicity can help clinicians predict the prevalence of the C-shaped canal system in mandibular molars.
KeywordsC-shaped canal Cone beam computed tomography Mandibular molar Longitudinal groove Dental anatomy
The authors are grateful to the College of Dentistry Research Center (CDRC) and Oral Medicine and Diagnostic Science Department, College of Dentistry, King Saud University.
The study was self-funded.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All procedures performed were in accordance with the ethical standards of the local institutional review board (No. E-17-2786).
Consent was not required for this type of study.
- 3.Barril I, Cochet JY, Ricci C (1989) Treatment of a canal with a “C” configuration. Rev Fr Endod 8:47–58Google Scholar
- 22.Bóveda C, Fajardo M, Millán B (1999) Root canal treatment of an invaginated maxillary lateral incisor with a C-shaped canal. Quintessence Int 30:707–711Google Scholar
- 32.Rogazkyn D, Solomonov M (2016) The prevalence and asymmetry of C-shaped root canals in second mandibular molars in a European–Russian population: a cone-beam computed tomography study in vivo. Int Endod. J Rehabil 2:12–16Google Scholar
- 34.Helvacioglu-Yigit D, Sinanoglu A (2013) Use of cone-beam computed tomography to evaluate C-shaped root canal systems in mandibular second molars in a Turkish subpopulation: a retrospective study. Int Endod J 46:1032–1038Google Scholar
- 35.Madani ZS, Mehraban N, Moudi E, Bijani A (2017) Root and canal morphology of mandibular molars in a selected Iranian population using cone-beam computed tomography. Iran Endod J 12:143–148Google Scholar