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Differences in positions of cone-beam computed tomography landmarks in patients with skeletal Class III facial asymmetry according to midsagittal planes.

Authors
  • Noh, Hyung-Kyu1
  • Kim, Ho-Jin1
  • Park, Hyo-Sang1
  • 1 Department of Orthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea. , (North Korea)
Type
Published Article
Journal
Korean journal of orthodontics
Publication Date
Jul 25, 2023
Volume
53
Issue
4
Pages
219–231
Identifiers
DOI: 10.4041/kjod23.015
PMID: 37322899
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This study aimed to clarify differences in the positions of cone-beam computed tomography (CBCT) landmarks according to different midsagittal planes (MSPs) in patients with skeletal Class III facial asymmetry. Pre-treatment CBCT data from 60 patients with skeletal Class III were used. The patients were classified into symmetric (menton deviations of < 2 mm) or asymmetric (menton deviations of > 4 mm) groups. Six MSPs were established based on previous studies, and three-dimensional analyses were performed for the planes in both the groups. The measurement outcomes were compared statistically. A statistically significant interaction (p < 0.01) was observed between MSPs and facial asymmetry. No significant differences were observed among MSPs in the symmetric group. However, significant differences in linear measurements were identified among MSPs in the asymmetric group. Specifically, the upper facial MSP revealed both maxillary and mandibular transverse asymmetries. On the other hand, anterior nasal spine (ANS)-associated MSP could not identify maxillary asymmetry. Furthermore, the menton deviation was approximately 3 mm lower when estimated using the ANS-associated MSP than that using upper facial MSP. The choice of MSP can significantly affect treatment outcomes while diagnosing patients with asymmetry. Therefore, care should be taken when selecting MSP in clinical practice.

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