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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 September 22, 2022

Copyright © The Korean Association of Orthodontists.

Consideration of root position in virtual tooth setup for extraction treatment: A comparative study of simulated and achieved treatment results of root position

Mirinae Park, DDS, MSD, PhD,a Veerasathpurush Allareddy, BDS, MBA, MHA, PhD, MMSc,b Phimon Atsawasuwan, DDS, MSc, PhD,c Min Kyeong Lee, DMD, DMSc,d Kyungmin Clara Lee, DDS, MSD, PhDe

aPostgraduate Student, Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
bProfessor and Department Chair, Department of Orthodontics, University of Illinois Chicago, Chicago, Illinois, USA
cAssociate Professor, Department of Orthodontics, University of Illinois Chicago, Chicago, Illinois, USA
dClinical Assistant Professor, Department of Orthodontics, University of Illinois Chicago, Chicago, Illinois, USA
eProfessor, Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea; Visiting Professor, Department of Orthodontics, College of Dentistry, University of Illinois Chicago, Chicago, Illinois, USA

Correspondence to:Dr. Kyungmin Clara Lee
Department of Orthodontics, School of Dentistry, Chonnam National University 33 Yongbong-ro, Buk-gu, Gwangju 61186, KOREA
Business phone: +82-62-530-5864; Fax: +82-62-530-5659
E-mail: ortholkm@jnu.ac.kr; klee286@uic.edu

Abstract

Objective: The purpose of the present study was to compare the root positions in virtual tooth setups using only crowns in a simulated treatment with those achieved in the actual treatment. Methods: Intraoral scans and the corresponded CBCT scans at pre- and post-treatment were obtained from 15 patients who completed orthodontic treatment with premolar extraction. A conventional virtual tooth setup was performed for treatment simulation. Three-dimensional (3D) digital tooth models at pre- and posttreatment were fabricated by integrating the patients’ intraoral scans and their CBCT scans. The simulated root positions in the virtual setup were obtained by merging the crown in the virtual setup and the root in the pretreatment tooth model. The root positions of the simulated posttreatment and the actual posttreatment tooth models were compared. Results: The differences in root positions between the simulated and actual dental models showed a difference of more than 1 mm in all samples, and statistically significant differences were observed (p<0.05) except for maxillary lateral incisors. The differences in the inter-root angulation showed more than 1 degree in all teeth, and statistically significant differences were observed in the maxillary and mandibular canines. Conclusion: The virtual tooth setup using only crown data showed errors over the clinical limit. Clinical application of virtual setup using crown and root is necessary for accurate and precise treatment simulation, particularly in extraction treatment.

Keywords: Digital models, Digital simulation, 3-Dimensional diagnosis and treatment planning, Diagnosis and treatment planning

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Korean J Orthod   

First Published Date September 22, 2022

Copyright © The Korean Association of Orthodontists.

Consideration of root position in virtual tooth setup for extraction treatment: A comparative study of simulated and achieved treatment results of root position

Mirinae Park, DDS, MSD, PhD,a Veerasathpurush Allareddy, BDS, MBA, MHA, PhD, MMSc,b Phimon Atsawasuwan, DDS, MSc, PhD,c Min Kyeong Lee, DMD, DMSc,d Kyungmin Clara Lee, DDS, MSD, PhDe

aPostgraduate Student, Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
bProfessor and Department Chair, Department of Orthodontics, University of Illinois Chicago, Chicago, Illinois, USA
cAssociate Professor, Department of Orthodontics, University of Illinois Chicago, Chicago, Illinois, USA
dClinical Assistant Professor, Department of Orthodontics, University of Illinois Chicago, Chicago, Illinois, USA
eProfessor, Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea; Visiting Professor, Department of Orthodontics, College of Dentistry, University of Illinois Chicago, Chicago, Illinois, USA

Correspondence to:Dr. Kyungmin Clara Lee
Department of Orthodontics, School of Dentistry, Chonnam National University 33 Yongbong-ro, Buk-gu, Gwangju 61186, KOREA
Business phone: +82-62-530-5864; Fax: +82-62-530-5659
E-mail: ortholkm@jnu.ac.kr; klee286@uic.edu

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 the present study was to compare the root positions in virtual tooth setups using only crowns in a simulated treatment with those achieved in the actual treatment. Methods: Intraoral scans and the corresponded CBCT scans at pre- and post-treatment were obtained from 15 patients who completed orthodontic treatment with premolar extraction. A conventional virtual tooth setup was performed for treatment simulation. Three-dimensional (3D) digital tooth models at pre- and posttreatment were fabricated by integrating the patients’ intraoral scans and their CBCT scans. The simulated root positions in the virtual setup were obtained by merging the crown in the virtual setup and the root in the pretreatment tooth model. The root positions of the simulated posttreatment and the actual posttreatment tooth models were compared. Results: The differences in root positions between the simulated and actual dental models showed a difference of more than 1 mm in all samples, and statistically significant differences were observed (p<0.05) except for maxillary lateral incisors. The differences in the inter-root angulation showed more than 1 degree in all teeth, and statistically significant differences were observed in the maxillary and mandibular canines. Conclusion: The virtual tooth setup using only crown data showed errors over the clinical limit. Clinical application of virtual setup using crown and root is necessary for accurate and precise treatment simulation, particularly in extraction treatment.

Keywords: Digital models, Digital simulation, 3-Dimensional diagnosis and treatment planning, Diagnosis and treatment planning