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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod   

First Published Date November 16, 2022

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of the mandibular condyle in adults with various skeletal patterns

Authors: Ahmed Maher Mohsen1,2, Junjie Ye1,2*, Akram Al-Nasri1,2*, Catherine chu1,2,Wei-Bing Zhang1,2,3,4 ,Lin-Wang1,2

1Jiangsu Key Laboratory of Oral Disease, Nanjing Medical University, Nanjing, China.
2Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
3Department of Stomatology, Dushu Lake Hospital Affiliated to Soochow University, China.
4Department of Stomatology, Medical Center of Soochow University, China.

Correspondence to:Professor Wei-Bing Zhang
Tel:+86-025-69593061, E-mail: wbzhang@suda.edu.cn

Abstract

Objectives: morphometrical and morphological evaluation of the mandibular condyle in adults and find any correlation with various skeletal malocclusion patterns.
Materials and Methods: using cone-beam computed tomography (CBCT). 3D segmentation based on CBCT images obtained for 135 adult patients was used in this study, were classified into groups according to 4 criteria: (1) gender (male and female); (2) sagittal skeletal discrepancy (Class I, Class II, and Class III); (3) vertical skeletal discrepancy (hyperdivergent, normodivergent, and hypodivergent); and age (group1≤20 years, 21≤group2<30, and group3≥30years). Morphometrical variables are mandibular condyle height and width; Morphological variables are mandibular condyle shape in coronal and sagittal sections. 3D STL files were made by itk-snap (open-source software) and measurements done by using meshmixer (open-source software).
Results: Statistically significant mandibular condyle height (P<0.05), where it is greater in Class III than in Class I and Class II; mandibular condyle width was not significant in various groups of gender, age, and sagittal and vertical malocclusions. There were no statistical associations of various mandibular condyle shapes among different groups of gender, age, and skeletal malocclusions.
Conclusions: condylar height was most considerable in Class III. Males showed more extensive morphometrical measurements compared to females. Various Mandibular condyle shapes in sagittal and coronal sections do not affect the skeletal malocclusion patterns.

Keywords: Growth and development, TMJ, ClassIII, 3D Cephalometrics

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Korean J Orthod   

First Published Date November 16, 2022

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of the mandibular condyle in adults with various skeletal patterns

Authors: Ahmed Maher Mohsen1,2, Junjie Ye1,2*, Akram Al-Nasri1,2*, Catherine chu1,2,Wei-Bing Zhang1,2,3,4 ,Lin-Wang1,2

1Jiangsu Key Laboratory of Oral Disease, Nanjing Medical University, Nanjing, China.
2Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
3Department of Stomatology, Dushu Lake Hospital Affiliated to Soochow University, China.
4Department of Stomatology, Medical Center of Soochow University, China.

Correspondence to:Professor Wei-Bing Zhang
Tel:+86-025-69593061, E-mail: wbzhang@suda.edu.cn

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives: morphometrical and morphological evaluation of the mandibular condyle in adults and find any correlation with various skeletal malocclusion patterns.
Materials and Methods: using cone-beam computed tomography (CBCT). 3D segmentation based on CBCT images obtained for 135 adult patients was used in this study, were classified into groups according to 4 criteria: (1) gender (male and female); (2) sagittal skeletal discrepancy (Class I, Class II, and Class III); (3) vertical skeletal discrepancy (hyperdivergent, normodivergent, and hypodivergent); and age (group1≤20 years, 21≤group2<30, and group3≥30years). Morphometrical variables are mandibular condyle height and width; Morphological variables are mandibular condyle shape in coronal and sagittal sections. 3D STL files were made by itk-snap (open-source software) and measurements done by using meshmixer (open-source software).
Results: Statistically significant mandibular condyle height (P<0.05), where it is greater in Class III than in Class I and Class II; mandibular condyle width was not significant in various groups of gender, age, and sagittal and vertical malocclusions. There were no statistical associations of various mandibular condyle shapes among different groups of gender, age, and skeletal malocclusions.
Conclusions: condylar height was most considerable in Class III. Males showed more extensive morphometrical measurements compared to females. Various Mandibular condyle shapes in sagittal and coronal sections do not affect the skeletal malocclusion patterns.

Keywords: Growth and development, TMJ, ClassIII, 3D Cephalometrics