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KJO Korean Journal of Orthodontics

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eISSN 2005-372X
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Korean J Orthod

Published online November 18, 2020

Copyright © The Korean Association of Orthodontists.

Mid-facial Soft Tissue Changes after Maxillary Expansion using Micro-implant-supported Maxillary Skeletal Expanders in Young Adults: A Retrospective Study

Hieu Nguyena*; Jeong Won Shinb*; Hai-Van Giapa; Ki Beom Kimc; Hwa Sung Chaed; Young Ho Kime; Hae Won Choif

aGraduate student, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
bClinical Professor, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
cAssociate Professor, Department of Orthodontics, Center for Advanced Dental Education, Saint Louis University, Saint Louis, MO.
dAdjunct Professor, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
eProfessor, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
eClinical Associate Professor, Department of Orthodontics, The Institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

Correspondence to:Hae Won Choi, D.D.S., M.S., Ph.D.
Clinical Associate Professor, Department of Orthodontics, The Institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine. 81 Ilwon-ro, Gangnam-gu 06351, Seoul, Korea.
Tel: +82-2-3410-2420, Fax: +82-2-3410-0038
Email: orthochoi7@gmail.com
* Dr. Hieu Nguyen and Dr. Jeong Won Shin have equally contributed as first authors.

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 aim of this retrospective study was to assess the mid-facial soft tissue changes following maxillary expansion using micro-implant-supported maxillary skeletal expanders (MSE) in young adults by cone-beam computerized tomography and to evaluate the correlations between hard and soft tissue changes after MSE.
Methods: Twenty patients (mean age, 22.4 years; range, 17.6-27.1) with maxillary transverse deficiency treated with MSE were selected. Mean expansion amount was 6.5 mm. Cone-beam computerized tomography images taken before and after expansion were superimposed to measure the changes in soft and hard tissue landmarks. Statistical analyses were performed using paired t-test and Pearson’s correlation analysis according to the normality of data.
Results: Average lateral movement of the cheek points was 1.35 mm (right) and 1.08 mm (left), and those of the alar curvature points was 1.03 (right) and 1.02 mm (left) (p < 0.05). Average forward displacement of the cheek points was 0.59 mm (right) and 0.44 mm (left), and those of the alar curvature points was 0.61 mm (right) and 0.77 mm (left) (p < 0.05). Anterior nasal spine (ANS), posterior nasal spine (PNS), and alveolar bone width were significantly increased (p < 0.05). The changes in cheek and alar curvature points on both sides significantly correlated with hard tissue changes (p < 0.05).
Conclusions: Maxillary expansion using MSE resulted in significant lateral and forward movements of the soft tissues of the cheek and alar curvature points on both sides in young adults, and correlated 50 with maxillary suture opening at the ANS and PNS.

Keywords: Maxillary expansion, Micro-implant-supported maxillary skeletal expander (MSE), Soft

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Korean J Orthod

Published online November 18, 2020

Copyright © The Korean Association of Orthodontists.

Mid-facial Soft Tissue Changes after Maxillary Expansion using Micro-implant-supported Maxillary Skeletal Expanders in Young Adults: A Retrospective Study

Hieu Nguyena*; Jeong Won Shinb*; Hai-Van Giapa; Ki Beom Kimc; Hwa Sung Chaed; Young Ho Kime; Hae Won Choif

aGraduate student, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
bClinical Professor, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
cAssociate Professor, Department of Orthodontics, Center for Advanced Dental Education, Saint Louis University, Saint Louis, MO.
dAdjunct Professor, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
eProfessor, Department of Orthodontics, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
eClinical Associate Professor, Department of Orthodontics, The Institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

Correspondence to:Hae Won Choi, D.D.S., M.S., Ph.D.
Clinical Associate Professor, Department of Orthodontics, The Institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine. 81 Ilwon-ro, Gangnam-gu 06351, Seoul, Korea.
Tel: +82-2-3410-2420, Fax: +82-2-3410-0038
Email: orthochoi7@gmail.com
* Dr. Hieu Nguyen and Dr. Jeong Won Shin have equally contributed as first authors.

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 aim of this retrospective study was to assess the mid-facial soft tissue changes following maxillary expansion using micro-implant-supported maxillary skeletal expanders (MSE) in young adults by cone-beam computerized tomography and to evaluate the correlations between hard and soft tissue changes after MSE.
Methods: Twenty patients (mean age, 22.4 years; range, 17.6-27.1) with maxillary transverse deficiency treated with MSE were selected. Mean expansion amount was 6.5 mm. Cone-beam computerized tomography images taken before and after expansion were superimposed to measure the changes in soft and hard tissue landmarks. Statistical analyses were performed using paired t-test and Pearson’s correlation analysis according to the normality of data.
Results: Average lateral movement of the cheek points was 1.35 mm (right) and 1.08 mm (left), and those of the alar curvature points was 1.03 (right) and 1.02 mm (left) (p < 0.05). Average forward displacement of the cheek points was 0.59 mm (right) and 0.44 mm (left), and those of the alar curvature points was 0.61 mm (right) and 0.77 mm (left) (p < 0.05). Anterior nasal spine (ANS), posterior nasal spine (PNS), and alveolar bone width were significantly increased (p < 0.05). The changes in cheek and alar curvature points on both sides significantly correlated with hard tissue changes (p < 0.05).
Conclusions: Maxillary expansion using MSE resulted in significant lateral and forward movements of the soft tissues of the cheek and alar curvature points on both sides in young adults, and correlated 50 with maxillary suture opening at the ANS and PNS.

Keywords: Maxillary expansion, Micro-implant-supported maxillary skeletal expander (MSE), Soft