Prevalence of C-shaped mandibular second molars in Zahedan


m Noormandi Poor 1 , * , Masoud nasiri 2

1 Dept of Endodontics, Faculty of dentistry, Zahedan University of Medical Sciences and Health Services Zahedan, Iran.

2 Dentist

How to Cite: Noormandi Poor M, nasiri M. Prevalence of C-shaped mandibular second molars in Zahedan, Zahedan J Res Med Sci. 2007 ; 9(4):e94750.


Zahedan Journal of Research in Medical Sciences: 9 (4); e94750
Published Online: August 10, 2007
Article Type: Research Article
Received: June 26, 2007
Accepted: July 27, 2007


Background: Incorrect diagnosis in internal anatomy and morphology of the pulp increases
failure probability in endodontics treatments. Thus, being familiared with possible anatomic forms
of tooth root canals is necessary. The aim of this study was prevalence assessment of C-shaped
canals in mandibular second molars of patients attending to the surgery department of Zahedan
dentistry school and dentistry centers in Zahedan 2006-2007.
Materials and Methods: In this study, a total number of 368 mandibular second molars of the
patients attending to surgery department of Zahedan dentistry school and city dentistry centers
were collected. Then access cavities were performed on the teeth with fused roots by high speed
handpiece with water spray and fissure bur. Teeth which had C-shaped orifices were separated
under direct dental unit light and 3x magnification . After that teeth were marked on three points:
CEJ, midroot, and 2mm to apex and were mounted in translucent acryl. Radiographic images were
taken from each tooth in faciolingual and mesiodistal aspects. Then 0.2mm thickness cross sections
were made by hand piece and diamond disc (D&Z). These sections were assessed under
stereomicroscope by 40 magnifications. C-shaped canal forms were categorized according to
Melton classification and their radiographic views were classified according to Fan classification.
Results: This research was performed on 368 mandibular second molars, out of which 312 teeth
(84.8%) had two separate mesial and distal roots. 56 teeth (15.2%) had fused roots 11 of which
(3%) had C-shaped canals. The number of teeth in each category and type was as following : 5
(1.35%) category I , 4 (1.08%) category II , 2 (0.57%) category III. Based on radiographic views
the number of teeth in each type was as following: 4 (0.36.4%) type I. 2 (18.2%) type II and 5
(44.4%) type III.
Discussion: Clinical significance of c-shaped canal is due to cleaning and obturation problems
of the canal. %3 prevalence of c-shaped canal in studied group of this survey showed the necessity
of clinician care for better diagnosis and treatment and higher success rate of root canals


The full text of this article is available on the PDF file.


  • 1.

    The References of this article are available on the PDF file.

  • © 2007, Zahedan Journal of Research in Medical Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License ( which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.