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A New Approach to Set the Absolute Midsagittal Plane of the Mandible Using a Similarity Index in Skeletal Class III Patients with Facial Asymmetry

Authors
 Woo-Jin Han  ;  Jae Joon Hwang  ;  Yun-Hoa Jung  ;  Bong-Hae Cho  ;  Kee-Joon Lee  ;  Hyung-Seog Yu  ;  Sung-Hwan Choi 
Citation
 APPLIED SCIENCES-BASEL, Vol.10(23) : 8550, 2020-11 
Journal Title
 APPLIED SCIENCES-BASEL 
Issue Date
2020-11
Keywords
similarity index ; facial asymmetry ; computed modified absolute mandibular midsagittal plane ; mental foramen ; computer algorithm
Abstract
This study sought to test the feasibility of a newly developed plane called computed modified absolute mandibular midsagittal plane (cmAMP) based on the similarity index (SI) for evaluating the stereoscopical symmetry of the mandible by comparison with other proposed midsagittal planes. This study involved 29 adult patients (15 men, 14 women; average age, 23.1 ± 6.9 years) with skeletal Class III facial asymmetry who underwent bimaxillary orthognathic surgery. Using cone-beam computed tomography images taken before and 1 year after surgery, cmAMP with the highest SI value between the two anterior segments of the hemi-mandible was set by a computer algorithm. Results show that the SI using cmAMP had the highest value (0.83 ± 0.04) before surgery compared to the other midsagittal planes, and was not significantly different from the SI (0.80 ± 0.05) using a facial midsagittal plane (MSP) after surgery. The distance (1.15 ± 0.74 mm) and angle (2.02 ± 0.82°) between MSP and cmAMP after surgery were significantly smaller than those between MSP and other midsagittal planes. In conclusion, the cmAMP plane best matches the two anterior segments of hemi-mandible symmetrically and is the closest to MSP after orthognathic surgery in skeletal Class III patients with facial asymmetry.
Files in This Item:
T202005223.pdf Download
DOI
10.3390/app10238550
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Yu, Hyung Seog(유형석) ORCID logo https://orcid.org/0000-0002-1275-5078
Lee, Kee Joon(이기준) ORCID logo https://orcid.org/0000-0002-0782-3128
Choi, Sung Hwan(최성환) ORCID logo https://orcid.org/0000-0002-1150-0268
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/180765
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