모바일 메뉴

KJO Korean Journal of Orthodontics

Open Access

pISSN 2234-7518
eISSN 2005-372X
QR Code QR Code

퀵메뉴 버튼

Article

home All Articles View
Split Viewer

Article In Press

Korean J Orthod

Published online November 18, 2020

Copyright © The Korean Association of Orthodontists.

Mandibular condyle and glenoid fossa morphology according to vertical and sagittal skeletal patterns: a cone beam computed tomography study

Kyoung Jin Noh,1 Hyoung-Seon Baik,2 Sang-Sun Han,3 Woowon Jang,1 Yoon Jeong Choi2

1, Private Practice, Seoul, Korea
2, Department of Orthodontics, The Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, Korea
3, Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul, Korea

Correspondence to:Yoon Jeong Choi
- Associate professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Yonsei University College of Dentistry, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
- Email: yoonjchoi@yuhs.ac
- Tel: 82-2-2228-3101 / Fax: 82-2-363-3404

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

Objective: This study was performed to evaluate the following null hypothesis: there are no differences in morphology of the TMJ structures according to vertical and sagittal cephalometric patterns. Methods: This retrospective study was performed for 131 subjects having no TMJ symptom (48 men and 83 women; mean age 23.5 years; range 18.0–39.6 years). The subjects were divided into Class I, II, and III groups according to sagittal cephalometric relationships and into Hyperdivergent, Normodivergent, and Hypodivergent groups according to vertical cephalometric relationships. The following measurements were performed from CBCT images and compared among groups: condylar volume, condylar size (width, length, and height), fossa size (length and height), and condyle-to-fossa joint spaces at the anterior, superior, and posterior condylar poles. Results: The null hypothesis was rejected. Class III group showed larger values of condylar width, condylar height, and fossa height than Class II group (P < 0.05). Condylar volume and superior joint space in Hyperdivergent group were significantly smaller than the other two vertical groups (P < 0.001), whereas fossa length and height were significantly larger in Hyperdivergent group than in the other groups (P < 0.01). Hypodivergent group had wider condylar width than Hyperdivergent group (P < 0.01). There were statistically significant interactions between sagittal and vertical cephalometric patterns on fossa length and height. Conclusions: TMJ morphology differed according to diverse skeletal cephalometric patterns. The fossa length and height were affected by interaction of vertical and sagittal skeletal patterns.

Keywords: TMJ, CT, Cephalometrics

Article

ahead

Korean J Orthod

Published online November 18, 2020

Copyright © The Korean Association of Orthodontists.

Mandibular condyle and glenoid fossa morphology according to vertical and sagittal skeletal patterns: a cone beam computed tomography study

Kyoung Jin Noh,1 Hyoung-Seon Baik,2 Sang-Sun Han,3 Woowon Jang,1 Yoon Jeong Choi2

1, Private Practice, Seoul, Korea
2, Department of Orthodontics, The Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, Korea
3, Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul, Korea

Correspondence to:Yoon Jeong Choi
- Associate professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Yonsei University College of Dentistry, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
- Email: yoonjchoi@yuhs.ac
- Tel: 82-2-2228-3101 / Fax: 82-2-363-3404

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

Objective: This study was performed to evaluate the following null hypothesis: there are no differences in morphology of the TMJ structures according to vertical and sagittal cephalometric patterns. Methods: This retrospective study was performed for 131 subjects having no TMJ symptom (48 men and 83 women; mean age 23.5 years; range 18.0–39.6 years). The subjects were divided into Class I, II, and III groups according to sagittal cephalometric relationships and into Hyperdivergent, Normodivergent, and Hypodivergent groups according to vertical cephalometric relationships. The following measurements were performed from CBCT images and compared among groups: condylar volume, condylar size (width, length, and height), fossa size (length and height), and condyle-to-fossa joint spaces at the anterior, superior, and posterior condylar poles. Results: The null hypothesis was rejected. Class III group showed larger values of condylar width, condylar height, and fossa height than Class II group (P < 0.05). Condylar volume and superior joint space in Hyperdivergent group were significantly smaller than the other two vertical groups (P < 0.001), whereas fossa length and height were significantly larger in Hyperdivergent group than in the other groups (P < 0.01). Hypodivergent group had wider condylar width than Hyperdivergent group (P < 0.01). There were statistically significant interactions between sagittal and vertical cephalometric patterns on fossa length and height. Conclusions: TMJ morphology differed according to diverse skeletal cephalometric patterns. The fossa length and height were affected by interaction of vertical and sagittal skeletal patterns.

Keywords: TMJ, CT, Cephalometrics