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KJO Korean Journal of Orthodontics

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Korean J Orthod

Published online November 15, 2021

Copyright © The Korean Association of Orthodontists.

Age-related differences in dentoskeletal and soft tissue changes due to rapid maxillary expansion using a tooth-borne expander: A retrospective observational study

Jung-Sub Ana, Bo-Yeon Seob, Sug-Joon Ahnc

aClinical Professor, Department of Orthodontics, Seoul National University Dental Hospital, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
bResearcher, Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
cProfessor, Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea

Correspondence to:Sug-Joon Ahn
Professor, Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
Telephone: +82-2-2072-2672
Fax: +82-2-2072-3817
E-mail: titoo@snu.ac.kr

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: The purpose of this study was to compare the differences in dentoskeletal and soft tissue changes after conventional tooth-borne RME (rapid maxillary expansion) between adolescents and adults.
Methods: Dentoskeletal and soft tissue variables of 17 adolescents and 17 adults were analyzed on posteroanterior and lateral cephalograms and frontal photographs at pretreatment (T1) and after conventional RME using tooth-borne expanders (T2). Changes in variables within each group between T1 and T2 were analyzed using the Wilcoxon signed-rank test. The Mann-Whitney U test was used to determine the difference in pretreatment age, expansion and post-expansion durations, and dentoskeletal and soft tissue changes after RME between the groups. The Spearman’s correlation between pretreatment age and transverse dentoskeletal changes in the adolescent group was calculated.
Results: Despite the similar amount of expansion at the crown level in both groups, the adult group underwent less skeletal expansion with less intermolar root expansion than the adolescent group after RME. The skeletal vertical dimension increased significantly in both groups, without intergroup differences. The anteroposterior position of the maxilla was maintained in both groups, while a greater backward displacement of the mandible was evident in the adult group than in the adolescent group after RME. The soft tissue alar width increased in both groups without a significant intergroup difference. In the adolescent group, pretreatment age was not significantly correlated with transverse dentoskeletal changes.
Conclusions: This study suggests that conventional RME may induce similar soft tissue changes but different dentoskeletal changes between adolescents and adults.

Keywords: Aging, PA cephalometrics, Rapid maxillary expansion, Tooth-borne expander

Article

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Korean J Orthod

Published online November 15, 2021

Copyright © The Korean Association of Orthodontists.

Age-related differences in dentoskeletal and soft tissue changes due to rapid maxillary expansion using a tooth-borne expander: A retrospective observational study

Jung-Sub Ana, Bo-Yeon Seob, Sug-Joon Ahnc

aClinical Professor, Department of Orthodontics, Seoul National University Dental Hospital, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
bResearcher, Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
cProfessor, Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea

Correspondence to:Sug-Joon Ahn
Professor, Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
Telephone: +82-2-2072-2672
Fax: +82-2-2072-3817
E-mail: titoo@snu.ac.kr

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: The purpose of this study was to compare the differences in dentoskeletal and soft tissue changes after conventional tooth-borne RME (rapid maxillary expansion) between adolescents and adults.
Methods: Dentoskeletal and soft tissue variables of 17 adolescents and 17 adults were analyzed on posteroanterior and lateral cephalograms and frontal photographs at pretreatment (T1) and after conventional RME using tooth-borne expanders (T2). Changes in variables within each group between T1 and T2 were analyzed using the Wilcoxon signed-rank test. The Mann-Whitney U test was used to determine the difference in pretreatment age, expansion and post-expansion durations, and dentoskeletal and soft tissue changes after RME between the groups. The Spearman’s correlation between pretreatment age and transverse dentoskeletal changes in the adolescent group was calculated.
Results: Despite the similar amount of expansion at the crown level in both groups, the adult group underwent less skeletal expansion with less intermolar root expansion than the adolescent group after RME. The skeletal vertical dimension increased significantly in both groups, without intergroup differences. The anteroposterior position of the maxilla was maintained in both groups, while a greater backward displacement of the mandible was evident in the adult group than in the adolescent group after RME. The soft tissue alar width increased in both groups without a significant intergroup difference. In the adolescent group, pretreatment age was not significantly correlated with transverse dentoskeletal changes.
Conclusions: This study suggests that conventional RME may induce similar soft tissue changes but different dentoskeletal changes between adolescents and adults.

Keywords: Aging, PA cephalometrics, Rapid maxillary expansion, Tooth-borne expander