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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 January 20, 2023

Copyright © The Korean Association of Orthodontists.

The association between the severity of hypodontia and the characteristics of craniofacial morphology in Chinese: a cross-sectional study

Xin Xiong 1*; Jiaqi Liu1*; Yange Wu1; Chengxinyue Ye1; Qinlanhui Zhang1; Yufan Zhu1; Wenke Yang1; Jun Wang1

1Department of Orthodontics, State Key Laboratory of Oral Disease, National Clinical Research Center for Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China.

Correspondence to:Jun Wang, Department of Orthodontics, State Key Laboratory of Oral Disease, National Clinical Research Center for Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China
Tel; +86 028 8550 1425
E-mail; wangjunv@scu.edu.cn

Abstract

Objectives: This study aimed to investigate the craniofacial differences in hypodontia individuals and explore the relationship between craniofacial features and congenitally missing teeth number.
Methods: A cross-sectional study was conducted among 261 Chinese patients (124 males and 137 females aged 7 to 24 years), divided into four groups (without hypodontia: no teeth missing, mild: 1 or 2 missing teeth, moderate: 3 to 5 missing teeth, severe: 6 or more missing teeth) according to congenitally missing teeth number. Differences in cephalometric measurements among groups were analyzed. The multivariate linear regression test and smooth curve fitting were performed to evaluate the relationship between congenitally missing teeth number and cephalometric measurements.
Results: In hypodontia patients, SNA, NA-AP, FH-NA, ANB, Wits, ANS-Me/N-Me, GoGn-SN, UL-EP and LL-EP significantly decreased while Pog-NB, AB-NP, N-ANS and S-Go/N-Me significantly increased. In multivariate linear regression analysis, SNB, Pog-NB and S-Go/N-Me were positively related with the congenitally missing teeth number, while NA-AP, FH-NA, ANB, Wits, N-Me, ANS-Me, ANS-Me/N-Me, GoGn-SN, SGn-FH (Y-Axis), UL-EP and LL-EP were negatively related, with absolute values of regression coefficients ranged from 0.147 to 0.357. NA-AP, Pog-NB, S-Go/N-Me and GoGn-SN of both sexes showed the same tendency while UL-EP and LL-EP were different.
Conclusions: Compared with the controls, hypodontia patients tend toward a Class III skeletal relationship, a reduced lower anterior face height, a flatter mandibular plane, and more retrusive lips. Congenitally missing teeth number imposed greater effect on certain characteristics of craniofacial morphology of males than females.

Keywords: Tooth number, Cephalometrics, Hypodontia, Craniofacial morphology

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Korean J Orthod   

First Published Date January 20, 2023

Copyright © The Korean Association of Orthodontists.

The association between the severity of hypodontia and the characteristics of craniofacial morphology in Chinese: a cross-sectional study

Xin Xiong 1*; Jiaqi Liu1*; Yange Wu1; Chengxinyue Ye1; Qinlanhui Zhang1; Yufan Zhu1; Wenke Yang1; Jun Wang1

1Department of Orthodontics, State Key Laboratory of Oral Disease, National Clinical Research Center for Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China.

Correspondence to:Jun Wang, Department of Orthodontics, State Key Laboratory of Oral Disease, National Clinical Research Center for Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China
Tel; +86 028 8550 1425
E-mail; wangjunv@scu.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: This study aimed to investigate the craniofacial differences in hypodontia individuals and explore the relationship between craniofacial features and congenitally missing teeth number.
Methods: A cross-sectional study was conducted among 261 Chinese patients (124 males and 137 females aged 7 to 24 years), divided into four groups (without hypodontia: no teeth missing, mild: 1 or 2 missing teeth, moderate: 3 to 5 missing teeth, severe: 6 or more missing teeth) according to congenitally missing teeth number. Differences in cephalometric measurements among groups were analyzed. The multivariate linear regression test and smooth curve fitting were performed to evaluate the relationship between congenitally missing teeth number and cephalometric measurements.
Results: In hypodontia patients, SNA, NA-AP, FH-NA, ANB, Wits, ANS-Me/N-Me, GoGn-SN, UL-EP and LL-EP significantly decreased while Pog-NB, AB-NP, N-ANS and S-Go/N-Me significantly increased. In multivariate linear regression analysis, SNB, Pog-NB and S-Go/N-Me were positively related with the congenitally missing teeth number, while NA-AP, FH-NA, ANB, Wits, N-Me, ANS-Me, ANS-Me/N-Me, GoGn-SN, SGn-FH (Y-Axis), UL-EP and LL-EP were negatively related, with absolute values of regression coefficients ranged from 0.147 to 0.357. NA-AP, Pog-NB, S-Go/N-Me and GoGn-SN of both sexes showed the same tendency while UL-EP and LL-EP were different.
Conclusions: Compared with the controls, hypodontia patients tend toward a Class III skeletal relationship, a reduced lower anterior face height, a flatter mandibular plane, and more retrusive lips. Congenitally missing teeth number imposed greater effect on certain characteristics of craniofacial morphology of males than females.

Keywords: Tooth number, Cephalometrics, Hypodontia, Craniofacial morphology