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Assessment of the Retromolar Canal in Taiwan Subpopulation: A Cross-Sectional Cone-Beam Computed Tomography Study in a Medical Center

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School of Dentistry, China Medical University, Taichung 404, Taiwan
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Department of Dentistry, China Medical University Hospital, Taichung 404, Taiwan
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Department of Bioinformatics and Medical Engineering, Asia University, Taichung 413, Taiwan
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Department of Biomedical Engineering, Hungkuang University, Taichung 433, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editor: Brian D. Ross
Tomography 2021, 7(2), 219-227; https://doi.org/10.3390/tomography7020020
Received: 1 April 2021 / Revised: 21 May 2021 / Accepted: 28 May 2021 / Published: 31 May 2021
The retromolar canal is an anatomical variation that occurs in the mandibular bone. The retromolar canal typically originates in the mandibular canal on the distal side of the third molar and extends forward and upward to the retromolar foramen (RMF), which contains the neurovascular bundle. Accidentally damaging the neurovascular bundle in the retromolar canal during the extraction of the third molar, dental implant surgery, or maxillofacial orthognathic surgery may lead to subsequent complications such as incomplete local anesthesia, paresthesia, and bleeding during operation. The objective of this study was to investigate the prevalence of the RMF in the Taiwanese population in a medical center by using dental cone-beam computed tomography (CBCT) and to identify the position of the RMF in the mandibular bone. The dental CBCT images for the mandibular bone of 68 hemi-mandible were uploaded to the medical imaging software Mimics 15.1 to determine the prevalence of the RMF in the Taiwanese population and the three positional parameters of the RMF in the mandibular bone: (1) The diameter of the RMF, (2) the horizontal distance from the midpoint of the RMF to the distal cementoenamel junction of the second molar, and (3) the vertical distance from the midpoint of the RMF to the upper border of the mandibular canal. Seven RMFs were observed in the 68 hemi-mandibles. Thus, the RMF prevalence was 10.3%. In addition, the diameter of the RMF was 1.41 ± 0.30 mm (mean ± standard deviation), the horizontal distance from the midpoint of the RMF to the distal cementoenamel junction of the the second molar was 12.93 ± 2.87 mm, and the vertical distance from the midpoint of the RMF to the upper border of the mandibular canal below second molar was 13.62 ± 1.3487 mm. This study determined the prevalence of the RMF in the Taiwanese population in a medical center and its relative position in the mandibular bone. This information can provide clinicians with a reference for posterior mandible anesthesia and surgery to ensure medical safety. View Full-Text
Keywords: retromolar canal; dental cone-beam computed tomography; Taiwanese population retromolar canal; dental cone-beam computed tomography; Taiwanese population
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MDPI and ACS Style

Shen, Y.-W.; Chang, W.-C.; Huang, H.-L.; Tsai, M.-T.; Fuh, L.-J.; Hsu, J.-T. Assessment of the Retromolar Canal in Taiwan Subpopulation: A Cross-Sectional Cone-Beam Computed Tomography Study in a Medical Center. Tomography 2021, 7, 219-227. https://doi.org/10.3390/tomography7020020

AMA Style

Shen Y-W, Chang W-C, Huang H-L, Tsai M-T, Fuh L-J, Hsu J-T. Assessment of the Retromolar Canal in Taiwan Subpopulation: A Cross-Sectional Cone-Beam Computed Tomography Study in a Medical Center. Tomography. 2021; 7(2):219-227. https://doi.org/10.3390/tomography7020020

Chicago/Turabian Style

Shen, Yen-Wen; Chang, Wan-Chun; Huang, Heng-Li; Tsai, Ming-Tzu; Fuh, Lih-Jyh; Hsu, Jui-Ting. 2021. "Assessment of the Retromolar Canal in Taiwan Subpopulation: A Cross-Sectional Cone-Beam Computed Tomography Study in a Medical Center" Tomography 7, no. 2: 219-227. https://doi.org/10.3390/tomography7020020

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