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KJO Korean Journal of Orthodontics

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Korean J Orthod

Published online August 9, 2021

Copyright © The Korean Association of Orthodontists.

COMPARISON OF SOFT TISSUE CHANGES BETWEEN INCISOR TIPPING AND TRANSLATION IN PREMOLAR EXTRACTION

Wonkyeong Baik1; Sung-Hwan Choi2; Jung-Yul Cha3; Hyung-Seog Yu4; Kee-Joon Lee 5

1Postgraduate student, Department of Orthodontics, Yonsei University College of Dentistry
2Assistant Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
3Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
4Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
5Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry

Correspondence to:Kee-Joon Lee, DDS, PhD
5Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
Tel: (82-2) 2228-3105, /Fax: (82-2) 363-3404, orthojn@yuhs.ac
50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea

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 compared changes in soft tissues after extraction of the four premolars followed by maximum retraction of the anterior teeth according to the type of anterior teeth movement, tipping, and translation.
Methods: Patients who had undergone orthodontic treatment of extraction of four premolars were retrospectively selected and divided into either the tipping (n = 27) or translation (n = 26) group based on retraction amounts of the incisor root apex and the axis changes of the incisors during the treatment period. Lateral cephalograms of pre- and post-treatment were analyzed.
Results: There were no significant differences in variables between the tipping and translation groups before treatment. The retraction amounts of the root apex of the upper and lower incisors in the tipping group were 0.33 mm and 0.26 mm, respectively, and 5.02 mm and 5.31 mm, respectively, in the translation group (p < 0.001). The posterior movements of soft tissue point A and soft tissue point B in the tipping group were 0.61 mm and 1.25 mm, respectively, and 1.10 mm and 3.25 mm, respectively, in the translation group (p < 0.01). The mentolabial sulcus angle increased by 5.89 ° in the tipping group, whereas it decreased by 8.13 ° in the translation group (p < 0.001).
Conclusions: An increased amount of retraction of the incisor root apex led to increased posterior movement of soft tissue point A and soft tissue point B, and this appeared more distinct in cases of the lower incisor and lower lip.

Keywords: Tooth movement, Soft tissue, Tipping, Translation

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Korean J Orthod

Published online August 9, 2021

Copyright © The Korean Association of Orthodontists.

COMPARISON OF SOFT TISSUE CHANGES BETWEEN INCISOR TIPPING AND TRANSLATION IN PREMOLAR EXTRACTION

Wonkyeong Baik1; Sung-Hwan Choi2; Jung-Yul Cha3; Hyung-Seog Yu4; Kee-Joon Lee 5

1Postgraduate student, Department of Orthodontics, Yonsei University College of Dentistry
2Assistant Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
3Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
4Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
5Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry

Correspondence to:Kee-Joon Lee, DDS, PhD
5Professor, Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry
Tel: (82-2) 2228-3105, /Fax: (82-2) 363-3404, orthojn@yuhs.ac
50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea

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 compared changes in soft tissues after extraction of the four premolars followed by maximum retraction of the anterior teeth according to the type of anterior teeth movement, tipping, and translation.
Methods: Patients who had undergone orthodontic treatment of extraction of four premolars were retrospectively selected and divided into either the tipping (n = 27) or translation (n = 26) group based on retraction amounts of the incisor root apex and the axis changes of the incisors during the treatment period. Lateral cephalograms of pre- and post-treatment were analyzed.
Results: There were no significant differences in variables between the tipping and translation groups before treatment. The retraction amounts of the root apex of the upper and lower incisors in the tipping group were 0.33 mm and 0.26 mm, respectively, and 5.02 mm and 5.31 mm, respectively, in the translation group (p < 0.001). The posterior movements of soft tissue point A and soft tissue point B in the tipping group were 0.61 mm and 1.25 mm, respectively, and 1.10 mm and 3.25 mm, respectively, in the translation group (p < 0.01). The mentolabial sulcus angle increased by 5.89 ° in the tipping group, whereas it decreased by 8.13 ° in the translation group (p < 0.001).
Conclusions: An increased amount of retraction of the incisor root apex led to increased posterior movement of soft tissue point A and soft tissue point B, and this appeared more distinct in cases of the lower incisor and lower lip.

Keywords: Tooth movement, Soft tissue, Tipping, Translation