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International Journal of Dentistry
Volume 2013, Article ID 183869, 6 pages
Research Article

Prevalence of Three-Rooted Mandibular First Molars among Indians Using SCT

1Department of Conservative Dentistry and Endodontics, Modern Dental College & Research Centre, Indore, India
2Department of Conservative Dentistry and Endodontics, Dr. Z. A. Dental College, AMU, Aligarh, India
3Department of Public Health Dentistry, Modern Dental College & Research Centre, Indore, India

Received 1 April 2013; Accepted 29 May 2013

Academic Editor: Eiichiro Ariji

Copyright © 2013 Amit Kumar Garg 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.


Undetected extra roots or root canals are a major reason for failure of endodontic treatment. Failure to recognize an extra distolingual (DL) root in mandibular first molar may lead to incomplete debridement of the root canal system and eventually treatment failure. Therefore, it is crucial that atypical anatomy is identified before and during dental treatment. Spiral computed tomography (SCT) images can show 3D images, and therefore much detail can be used when traditional methods prevent adequate endodontic treatment. The overall incidence of DL roots on the mandibular first molars was 6.40% for all patients and 5.00% for all teeth, respectively. The occurrence of DL roots on the right side and on the left side showed a statistically significant difference. The bilateral incidence of symmetrical distribution of DL roots was 56.25%. The DL root canal orifice was separated from DB canal orifice by  mm, from the MB canal orifice by  mm, and from the ML canal orifice by  mm. The high prevalence of the DL root in permanent mandibular first molars among the Indian population by using SCT and estimations of the interorifice distance of such teeth might be useful for successful endodontic treatments.