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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 June 8, 2021

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of the transfer accuracy of a bracket jig produced with computer-aided design and manufacturing to the anterior dentition: In vitro study

Jae-Hyun Parka, Jin-Young Choib, Seong-Hun Kimc, Su-Jung Kimd, Kee-Joon Leee, Gerald Nelsonf

aGraduate student, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
bClinical Fellow, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
cProfessor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
dProfessor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
eProfessor, Department of Orthodontics, Institute of Cranio-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea,
fClinical Professor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.

Correspondence to:Seong-Hun Kim D.M.D., M.S.D., Ph.D.
Department of Orthodontics, Graduate School, Kyung Hee University, #1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
Telephone: 82-2-958-9392
E-mail address: bravortho@gmail.com

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:To evaluate the accuracy of a one-piece bracket jig system that is produced with a computer-aided design and manufacturing(CAD/CAM) technology using a three-dimensional(3D) digital superimposition method. Methods:A total of 226-anterior teeth, selected from 20-orthodontic patients were enrolled for this in-vitro study. Bracket position errors from each of the 40-arches were analyzed quantitatively by 3D-digital superimposition (best-fit algorithm) of the virtual bracket and the actual bracket after indirect bonding, taking into account possible variables that may affect accuracy, such as crowding and form of the resin base. Results:The device could transfer the bracket exactly to the desired position of the patient’s dentition within a clinically acceptable range of ±0.05mm in linear and 2.0° in angular measurement. There was a difference in average values from 0.029 to 0.101mm in the linear measurements. In the angular measurements, rotation was the value showing the least deviation. The range was from 0.396° to 0.623°. The directional bias was pronounced in the vertical direction; a large number of brackets were bonded toward the occlusal surface. No statistical difference was found for the three angular measurement values (torque, angulation, and rotation) in any group classified by crowded state. When the teeth were in a moderately crowded state, measurement values were affected by the resin base for M-D, B-L, and rotation. Conclusions:The characteristics of the CAD/CAM one-piece jig system were demonstrated according to the influencing factors, and the transfer accuracy was verified to be within a clinically acceptable level for the indirect bracket bonding of anterior teeth.

Keywords: 3D Scanner, bracket, bonding, Digital model

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Korean J Orthod

Published online June 8, 2021

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of the transfer accuracy of a bracket jig produced with computer-aided design and manufacturing to the anterior dentition: In vitro study

Jae-Hyun Parka, Jin-Young Choib, Seong-Hun Kimc, Su-Jung Kimd, Kee-Joon Leee, Gerald Nelsonf

aGraduate student, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
bClinical Fellow, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
cProfessor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
dProfessor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.
eProfessor, Department of Orthodontics, Institute of Cranio-Facial Deformity, College of Dentistry, Yonsei University, Seoul, Korea,
fClinical Professor, Department of Orthodontics, Graduate School, Kyung Hee University, Seoul, Korea.

Correspondence to:Seong-Hun Kim D.M.D., M.S.D., Ph.D.
Department of Orthodontics, Graduate School, Kyung Hee University, #1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
Telephone: 82-2-958-9392
E-mail address: bravortho@gmail.com

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:To evaluate the accuracy of a one-piece bracket jig system that is produced with a computer-aided design and manufacturing(CAD/CAM) technology using a three-dimensional(3D) digital superimposition method. Methods:A total of 226-anterior teeth, selected from 20-orthodontic patients were enrolled for this in-vitro study. Bracket position errors from each of the 40-arches were analyzed quantitatively by 3D-digital superimposition (best-fit algorithm) of the virtual bracket and the actual bracket after indirect bonding, taking into account possible variables that may affect accuracy, such as crowding and form of the resin base. Results:The device could transfer the bracket exactly to the desired position of the patient’s dentition within a clinically acceptable range of ±0.05mm in linear and 2.0° in angular measurement. There was a difference in average values from 0.029 to 0.101mm in the linear measurements. In the angular measurements, rotation was the value showing the least deviation. The range was from 0.396° to 0.623°. The directional bias was pronounced in the vertical direction; a large number of brackets were bonded toward the occlusal surface. No statistical difference was found for the three angular measurement values (torque, angulation, and rotation) in any group classified by crowded state. When the teeth were in a moderately crowded state, measurement values were affected by the resin base for M-D, B-L, and rotation. Conclusions:The characteristics of the CAD/CAM one-piece jig system were demonstrated according to the influencing factors, and the transfer accuracy was verified to be within a clinically acceptable level for the indirect bracket bonding of anterior teeth.

Keywords: 3D Scanner, bracket, bonding, Digital model