Table of Contents Author Guidelines Submit a Manuscript
Volume 2017 (2017), Article ID 1504341, 7 pages
Research Article

Evaluation of Root Canal Morphology of Mandibular First and Second Premolars Using Cone Beam Computed Tomography in a Defined Group of Dental Patients in Iran

1Department of Endodontics, Dental School, Qazvin University of Medical Sciences, Qazvin, Iran
2Private Practice, First Floor, No. 1, 7th Ave, Shohada Blvd, P.O. Box 3175745116, Fardis, Kara, Alborz Province, Iran
3Department of Oral Medicine, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4Department of Oral and Maxillofacial Radiology, Dental School, Qazvin University of Medical Sciences, Qazvin, Iran

Correspondence should be addressed to Maryam Tofangchiha

Received 13 May 2017; Revised 15 August 2017; Accepted 5 September 2017; Published 16 November 2017

Academic Editor: Cornelis F. Sier

Copyright © 2017 Neda Hajihassani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. Successful dental root canal treatments require a complete knowledge of dental anatomy and root canal morphology. Materials and Methods. One hundred and forty-five cone beam computed tomography (CBCT) images were used to assess the anatomy and morphology of mandibular premolars based on Vertucci’s classifications in a defined group of dental patients in Iran. The number of roots and root canals, root canal morphology, root and canal shape (curvature), existence of C-shaped canal, and influence of sex on each of these were evaluated. A chi-squared test was used for statistical analysis. Results. The mandibular first and second premolars had a single root in 95.97% and 100% cases, respectively. In the mandibular first premolars, 62.2% were of type I, 0.8% type II, 10.9% type III, 0.8% type IV, 20.3% type V, 4.2% type VI, and 0.8% type VII; in the second premolars, 78% of canals were of type I, 3% type II, 11% type III, 7% type V, and 1% type VI. C-shaped canals did not exist in either of the premolars. The most prevalent root and canal shape was straight. The most prevalent root curvature was a distal curvature in both premolars (71.4% and 74% of first and second premolars, resp.). The most prevalent canal curvature was lingual and buccal for the first premolars (7.6% each) and distal for the second premolars (11%). No significant difference was found between men and women in nearly all of the above (). Conclusion. The results suggest that there is a need to conduct further evaluations on finding root and canal variations among more populations to gain better knowledge prior to root canal treatment.