Anatomical Investigation of Middle Mesial Canals of Mandibular Molars in a Middle Eastern Population: A Cross-sectional Cone-beam Computed Tomography Study

JOURNAL TITLE: The Journal of Contemporary Dental Practice

Author
1. Elyssia Inaty
2. Gaby Haddad
3. Carla Jabre
4. Carla Zogheib
5. Walid Nehme
6. Issam Khalil
7. Alfred Naaman
ISSN
DOI
10.5005/jp-journals-10024-2920
Volume
21
Issue
8
Publishing Year
2020
Pages
6
Author Affiliations
    1. Department of Endodontics, Saint Joseph University, Faculty of Dentistry, Riad el solh, Beirut, Lebanon
    1. Department of Endodontics, Saint Joseph University, Faculty of Dentistry, Riad el solh, Beirut, Lebanon
    1. Department of Endodontics, Saint Joseph University, Faculty of Dentistry, Riad el solh, Beirut, Lebanon
    1. Department of Endodontics, Saint Joseph University, Faculty of Dentistry, Riad el solh, Beirut, Lebanon
    1. Department of Endodontics, School of Dentistry, Saint Joseph University of Beirut, Beirut, Lebanon
    1. Department of Endodontics, Saint Joseph University, Beirut, Lebanon
    1. Department of Endodontics, Saint Joseph University, Faculty of Dentistry, Riad el solh, Beirut, Lebanon
  • Article keywords

    Abstract

    Aim: To identify the prevalence of middle mesial canals (MMC) in mandibular molars in a Lebanese population to determine the relationship between MMC and different factors (age, sex, and tooth type) and to examine the canal's morphological aspects (category, length, orifice position, and dentin width toward furcation). Materials and methods: The presence of MMC in the mesial roots of 505 mandibular molars of 200 patients was analyzed using cone-beam computed tomography (CBCT). Then, the position of the MMC orifices with respect to the pulpal floor and the main canals orifices, and the width of dentin along the canal toward the furcation were determined using 3D Slicer 4.10.1. Results: In all, 14.65% of the first and second mandibular molars presented an MMC. A higher frequency of confluent canals was noted mostly joining the mesiobuccal canal (MBC). Gender appears to be a factor influencing the prevalence of MMCs, contrary to age-groups and tooth type. In mandibular first molars, the orifice is located at a mean distance of 1.22 ± 0.44 mm from the pulpal floor, 1.42 ± 0.53 mm from the MBC orifice, and 1.57 ± 0.60 mm from the mesiolingual canal (MLC) orifice. The width of dentin toward the furcation varies between 0.95 and 2.29 mm. In mandibular second molars, the orifice is located at a mean distance of 1.00 ± 0.51 mm from the pulpal floor, 1.39 ± 0.60 mm from the MBC orifice, and 1.37 ± 0.50 mm from MLC orifice. The width of dentin toward the furcation varies between 0.71 mm and 2.22 mm. Conclusion: Middle mesial canal is present in 14.65% of mandibular molars in the Lebanese population, with its orifice located under the pulpal floor. The majority of MMCs join the MBC. Clinical significance: Middle mesial canal is not a rare finding in the Lebanese population (14.65%). Clinicians should take time to search for this canal in the isthmus between the main mesial canals.

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