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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

Published online March 2, 2022

Copyright © The Korean Association of Orthodontists.

Validation of three-dimensional digital model superimpositions based on the palatal structures in patients with maximum anterior tooth retraction following premolar extraction

Jing Liu1, Kyong-Min Koh1, Sung-Hwan Choi1, Ji-Hoi Kim1,2, Jung-Yul Cha1,2

1 Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of
Dentistry, Seoul, Korea
2 BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea

Correspondence to:Jung-Yul Cha, D.D.S., M.S.D., Ph.D.
Professor, Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, BK21 FOUR Project, Yonsei University, Seoul, Korea 50-1 Yonseiro, Seodaemun-gu, Seoul 03722, Korea
Tel: 82-2-2228-3103 Fax: 82-2-363-3404
E-mail: jungcha@yuhs.ac

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 evaluate the superimposition accuracy of digital modes of measuring tooth movement in patients requiring anterior retraction after premolar extraction based on proposed reference regions.
Materials/Methods: Forty participants treated with bilateral maxillary first premolar extraction were divided into two groups: moderate retraction (< 7.0 mm) and maximum retraction (≥ 7.0 mm). Central incisor displacement was measured using two methods, namely cephalometric superimpositions and three-dimensional (3D) digital superimpositions with the 3rd or 4th ruga as the reference point. Wilcoxon signed-rank test and linear regression analyses were performed to test the significance of the differences and relationship between the two measurement techniques.
Results: In the moderate retraction group, the central incisor anteroposterior displacement values did not differ significantly between 3D digital and cephalometric superimpositions. However, in the maximum-retraction group, significant differences were observed between the anteroposterior displacement evaluated by the 3rd ruga superimposition and cephalometric method (p < 0.05).
Conclusion/Implications: This study demonstrated that 3D digital superimpositions were as clinically reliable as cephalometric superimpositions in assessing tooth movements in patients requiring moderate retraction. However, the reference point should be more carefully examined in patients needing maximum retraction.

Keywords: Digital models, Cephalometrics, Dental cast analysis, Palatal ruga

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Korean J Orthod

Published online March 2, 2022

Copyright © The Korean Association of Orthodontists.

Validation of three-dimensional digital model superimpositions based on the palatal structures in patients with maximum anterior tooth retraction following premolar extraction

Jing Liu1, Kyong-Min Koh1, Sung-Hwan Choi1, Ji-Hoi Kim1,2, Jung-Yul Cha1,2

1 Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of
Dentistry, Seoul, Korea
2 BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea

Correspondence to:Jung-Yul Cha, D.D.S., M.S.D., Ph.D.
Professor, Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, BK21 FOUR Project, Yonsei University, Seoul, Korea 50-1 Yonseiro, Seodaemun-gu, Seoul 03722, Korea
Tel: 82-2-2228-3103 Fax: 82-2-363-3404
E-mail: jungcha@yuhs.ac

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 evaluate the superimposition accuracy of digital modes of measuring tooth movement in patients requiring anterior retraction after premolar extraction based on proposed reference regions.
Materials/Methods: Forty participants treated with bilateral maxillary first premolar extraction were divided into two groups: moderate retraction (< 7.0 mm) and maximum retraction (≥ 7.0 mm). Central incisor displacement was measured using two methods, namely cephalometric superimpositions and three-dimensional (3D) digital superimpositions with the 3rd or 4th ruga as the reference point. Wilcoxon signed-rank test and linear regression analyses were performed to test the significance of the differences and relationship between the two measurement techniques.
Results: In the moderate retraction group, the central incisor anteroposterior displacement values did not differ significantly between 3D digital and cephalometric superimpositions. However, in the maximum-retraction group, significant differences were observed between the anteroposterior displacement evaluated by the 3rd ruga superimposition and cephalometric method (p < 0.05).
Conclusion/Implications: This study demonstrated that 3D digital superimpositions were as clinically reliable as cephalometric superimpositions in assessing tooth movements in patients requiring moderate retraction. However, the reference point should be more carefully examined in patients needing maximum retraction.

Keywords: Digital models, Cephalometrics, Dental cast analysis, Palatal ruga