Anatomical relationship between mandibular third molar roots and mandibular canal in panoramic radiography and CT scans

AUTHORS

Mohsen Hosseini-Goosheh 1 , * , s Asadi Samani 2 , sh Shahidi 3 , b Zamiri 4

AUTHORS INFORMATION

1 Dept of Endodontics Department, Faculty of Dentistry, Zahedan University of Medical Sciences and Health Services, Zahedan, Iran

2 Dentist

3 Dept of Radiology, Faculty of Dentistry, Shiraz University of Medical Sciences and Health Services, Shiraz, Iran

4 Dept of Surgery, Faculty of Dentistry, Shiraz University of Medical Sciences and Health Services, Shiraz, Iran

How to Cite: Hosseini-Goosheh M, Asadi Samani S, Shahidi S, Zamiri B. Anatomical relationship between mandibular third molar roots and mandibular canal in panoramic radiography and CT scans , Zahedan J Res Med Sci. 2008 ; 10(3):e94515.

ARTICLE INFORMATION

Zahedan Journal of Research in Medical Sciences: 10 (3); e94515
Published Online: August 08, 2008
Article Type: Research Article
Received: November 27, 2008
Accepted: July 07, 2008

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Abstract

Background: Inferior alveolar nerve (IAN) injuries are the third common complication after
infections and alveolar osteitis during third molars (M3s) extraction. The most common cause of
IAN injuries, is the proximity of M3 apices with mandibular canals, so the pre-operative
radiographic views (such as common or advanced techniques) are outmost important to detect the
proximity, number and position of M3s roots, and mandibular canal branches. the aim of this study
was to assay the exact detection of relationship between M3s and mandibular canals in panoramic
views and CT-Scans
Method and Material: 165 panoramic radiographs were assessed to detect the proximity signs
between M3 and mandibular canals. 9 patients (with 18 teeth) were detected and CT scan was
obtained.
Results: In panoramic views of 18 teeth, we could see root darkening in 11 cases, interruption of
white lines in 11 teeth, deflected root in 6 of them and canal divergence in 4 cases. In CT scan
views 12 teeth (%66/6) showed the association with mandibular canals and the 6 other teeth, in
spite of significant proximity signs in panoramic views, did not have any relation with the canal.
The associated teeth were mostly seen in women, left side and mesioangular and most of the canals
placed in lingual side to root apices.
Conclusion: Admittedly, the IAN injuries are complication during M3s extraction. So we have to
use the pre-operative radiographs for exact detection of anatomical proximities. If the proximity
signs between M3s and mandibular canals are seen in panoramic radiographs, it is highly
suggested to use advanced radiographic views such as tomography and CT scans.

Keywords

Third mandibular molar mandibular canal CT scan panoramic radiographic views

© 2008, 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 (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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