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Three-dimensional assessment of the anterior and inferior loop of the inferior alveolar nerve using computed tomography images in patients with and without mandibular asymmetry

 Jae-Young Kim  ;  Michael D Han  ;  Kug Jin Jeon  ;  Jong-Ki Huh  ;  Kwang-Ho Park 
 BMC ORAL HEALTH, Vol.21(1) : 71, 2021-02 
Journal Title
Issue Date
Cone-Beam Computed Tomography ; Facial Asymmetry* / diagnostic imaging ; Humans ; Imaging, Three-Dimensional* ; Mandible / diagnostic imaging ; Mandibular Nerve / diagnostic imaging ; Tomography, X-Ray Computed
Computed tomography ; Facial asymmetry ; Inferior alveolar nerve ; Three-dimensional analysis
Background: The purpose of this study was to investigate the differences in configuration and dimensions of the anterior loop of the inferior alveolar nerve (ALIAN) in patients with and without mandibular asymmetry. Method: Preoperative computed tomography images of patients who had undergone orthognathic surgery from January 2016 to December 2018 at a single institution were analyzed. Subjects were classified into two groups as "Asymmetry group" and "Symmetry group". The distance from the most anterior and most inferior points of the ALIAN (IANant and IANinf) to the vertical and horizontal reference planes were measured (dAnt and dInf). The distance from IANant and IANinf to the mental foramen were also calculated (dAnt_MF and dInf_MF). The length of the mandibular body and symphysis area were measured. All measurements were analyzed using 3D analysis software. Results: There were 57 total eligible subjects. In the Asymmetry group, dAnt and dAnt_MF on the non-deviated side were significantly longer than the deviated side (p < 0.001). dInf_MF on the non-deviated side was also significantly longer than the deviated side (p = 0.001). Mandibular body length was significantly longer on the non-deviated side (p < 0.001). There was no significant difference in length in the symphysis area (p = 0.623). In the Symmetry group, there was no difference between the left and right sides for all variables. Conclusion: In asymmetric patients, there is a difference tendency in the ALIAN between the deviated and non-deviated sides. In patients with mandibular asymmetry, this should be considered during surgery in the anterior mandible.
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2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Radiology (영상치의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Jae Young(김재영) ORCID logo https://orcid.org/0000-0002-9423-438X
Park, Kwang Ho(박광호) ORCID logo https://orcid.org/0000-0003-1942-2986
Jeon, Kug Jin(전국진) ORCID logo https://orcid.org/0000-0002-5862-2975
Huh, Jong Ki(허종기) ORCID logo https://orcid.org/0000-0002-7381-3972
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