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KJO Korean Journal of Orthodontics

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Korean J Orthod

Published online November 2, 2020

Copyright © The Korean Association of Orthodontists.

Full arch accuracy of five intraoral scanners: in vivo analysis of trueness and precision

Miran Kwona, Youngmok Chob, Dong-Wook Kima, MyungSu Kima, Yoon-Ji Kimc, Minho Changd

a Student, Department of Orthodontics, Korea University Graduate School of Dentistry, Seoul, Korea
b Student, Department of Mechanical Engineering, Korea University School of Engineering, Seoul, Korea
c Assistant Professor, Department of Orthodontics, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea
d Professor, Department of Mechanical Engineering, Korea University School of Engineering, Seoul, Korea

Correspondence to:Yoon-Ji Kim
Department of Orthodontics Asan Medical Center School of Medicine, University of Ulsan 88 Olympic-ro 43 gil, Songpa-gu, Seoul, 05505 Republic of Korea
yn0331@gmail.com
Tel +82-2-3010-3845

Minho Chang
Department of Mechanical Engineering Korea University School of Engineering 145 Anam-ro Seongbuk-gu, Seoul, 02731 Republic of Korea
mhchang@korea.ac.kr

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: To evaluate the trueness and precision of full-arch scans acquired using five intraoral scanners and investigate the factors associated with the dimensional accuracy of the intraoral scan data.
Methods: Nine adult participants (mean age, 34.3 ± 8.3 years) with complete permanent dentition were recruited. Four zirconium spheres (Ø 6 mm) were bonded to the palatal surface of the canines and to the occlusal surfaces of the molars. After reference scans by using an industrial-grade scanner, five intraoral scanners, i500, CS3600, Trios 3, iTero, and CEREC Omnicam, were used to scan the arches. Linear distances between the four reference spheres were automatically calculated. Linear mixed model analysis was performed to compare the trueness and precision of the intraoral scan data among different scanners.
Results: The mean trueness and precision of all intraoral scanners was 76.6 ± 79.3 μm and 56.6 ± 52.4 μm, respectively. The type of scanner and linear distances measured had significant effects on the accuracy of the intraoral scan data. Omnicam had higher dimensional errors in trueness than the other scanners in the intermolar dimensions and in the distance from the canine to the contralateral molar. For precision, Omnicam and CS3600 had higher errors in precision than the other scanners in the linear distances from the canine to the molar in the same quadrant.
Conclusions: There may be significant differences in the dimensional accuracy of the intraoral scan data according to the type of scanner, and the amount of error in trueness is clinically significant.

Keywords: digital impression, intraoral scanner, precision, trueness, in vivo analysis

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Korean J Orthod

Published online November 2, 2020

Copyright © The Korean Association of Orthodontists.

Full arch accuracy of five intraoral scanners: in vivo analysis of trueness and precision

Miran Kwona, Youngmok Chob, Dong-Wook Kima, MyungSu Kima, Yoon-Ji Kimc, Minho Changd

a Student, Department of Orthodontics, Korea University Graduate School of Dentistry, Seoul, Korea
b Student, Department of Mechanical Engineering, Korea University School of Engineering, Seoul, Korea
c Assistant Professor, Department of Orthodontics, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea
d Professor, Department of Mechanical Engineering, Korea University School of Engineering, Seoul, Korea

Correspondence to:Yoon-Ji Kim
Department of Orthodontics Asan Medical Center School of Medicine, University of Ulsan 88 Olympic-ro 43 gil, Songpa-gu, Seoul, 05505 Republic of Korea
yn0331@gmail.com
Tel +82-2-3010-3845

Minho Chang
Department of Mechanical Engineering Korea University School of Engineering 145 Anam-ro Seongbuk-gu, Seoul, 02731 Republic of Korea
mhchang@korea.ac.kr

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: To evaluate the trueness and precision of full-arch scans acquired using five intraoral scanners and investigate the factors associated with the dimensional accuracy of the intraoral scan data.
Methods: Nine adult participants (mean age, 34.3 ± 8.3 years) with complete permanent dentition were recruited. Four zirconium spheres (Ø 6 mm) were bonded to the palatal surface of the canines and to the occlusal surfaces of the molars. After reference scans by using an industrial-grade scanner, five intraoral scanners, i500, CS3600, Trios 3, iTero, and CEREC Omnicam, were used to scan the arches. Linear distances between the four reference spheres were automatically calculated. Linear mixed model analysis was performed to compare the trueness and precision of the intraoral scan data among different scanners.
Results: The mean trueness and precision of all intraoral scanners was 76.6 ± 79.3 μm and 56.6 ± 52.4 μm, respectively. The type of scanner and linear distances measured had significant effects on the accuracy of the intraoral scan data. Omnicam had higher dimensional errors in trueness than the other scanners in the intermolar dimensions and in the distance from the canine to the contralateral molar. For precision, Omnicam and CS3600 had higher errors in precision than the other scanners in the linear distances from the canine to the molar in the same quadrant.
Conclusions: There may be significant differences in the dimensional accuracy of the intraoral scan data according to the type of scanner, and the amount of error in trueness is clinically significant.

Keywords: digital impression, intraoral scanner, precision, trueness, in vivo analysis