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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 July 23, 2021

Copyright © The Korean Association of Orthodontists.

The accuracy of intermaxillary relational measurements in 3-dimensional printed dental models: Based on inter-operator differences

Won-joon Choia, Su-jung Leea and Cheol-Hyun Moonb

aPostgraduate Student, Department of Medicine , Gachon University Graduate School, Incheon, Korea
bProfessor, Department of Orthodontics, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea

Correspondence to:Dr. Cheol-Hyun Moon.
Professor and Department Chair, Department of Orthodontics, Gil Medical Center, Gachon University College of Medicine, 21 Namdong-daero 774, Namdong–gu, Incheon, 21565, South Korea
Tel +82324603881 e-mail orthodm@gilhospital.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

Objective: Digital models have been recently used in orthodontic clinics, but physical models are needed for many reasons. Many reports have been issued on the accuracies of printed models, but few studies have evaluated the accuracies of reproduced intermaxillary relationships. The purpose of this study was to evaluate whether the printed models can replace the plaster models by evaluating the accuracy of the intermaxillary relationships of the printed models and the clinicians’ ability to measure the printed models.
Methods: Twenty sets of patients’ plaster models with good occlusal relationships and conditions were selected. Models were scanned using an intraoral scanner (Trios 3, 3Shape Dental System, Copenhagen, Denmark) by one operator. Printed models were made with ZMD-1000B light-curing resin using the SLA method 3D printer. Validity, reliability, and reproducibility were evaluated using measurements obtained by three operators.
Results: In the validity evaluation, no items showed significant differences between measurements taken from plaster and printed models. In the reliability evaluation, significant differences were found at #23-#33 (DZL_3) for the plaster models and at #17-#43 (DZCM_1) for the printed models. In the reproducibility evaluation, the plaster models showed significant differences between operators at midline, and printed models showed significant differences at 7 measurements including #17-#47(DZR_7).
Conclusion: The validity and reliability of intermaxillary relationships as determined by the printed model were clinically acceptable, but the reproducibility revealed significant inter-operator differences. In order to use printed models as substitutes for plaster models, additional studies of the accuracies of intermaxillary relationship are required.

Keywords: Printed model, Intermaxillary relationship, Interoperator difference

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Korean J Orthod

Published online July 23, 2021

Copyright © The Korean Association of Orthodontists.

The accuracy of intermaxillary relational measurements in 3-dimensional printed dental models: Based on inter-operator differences

Won-joon Choia, Su-jung Leea and Cheol-Hyun Moonb

aPostgraduate Student, Department of Medicine , Gachon University Graduate School, Incheon, Korea
bProfessor, Department of Orthodontics, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea

Correspondence to:Dr. Cheol-Hyun Moon.
Professor and Department Chair, Department of Orthodontics, Gil Medical Center, Gachon University College of Medicine, 21 Namdong-daero 774, Namdong–gu, Incheon, 21565, South Korea
Tel +82324603881 e-mail orthodm@gilhospital.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

Objective: Digital models have been recently used in orthodontic clinics, but physical models are needed for many reasons. Many reports have been issued on the accuracies of printed models, but few studies have evaluated the accuracies of reproduced intermaxillary relationships. The purpose of this study was to evaluate whether the printed models can replace the plaster models by evaluating the accuracy of the intermaxillary relationships of the printed models and the clinicians’ ability to measure the printed models.
Methods: Twenty sets of patients’ plaster models with good occlusal relationships and conditions were selected. Models were scanned using an intraoral scanner (Trios 3, 3Shape Dental System, Copenhagen, Denmark) by one operator. Printed models were made with ZMD-1000B light-curing resin using the SLA method 3D printer. Validity, reliability, and reproducibility were evaluated using measurements obtained by three operators.
Results: In the validity evaluation, no items showed significant differences between measurements taken from plaster and printed models. In the reliability evaluation, significant differences were found at #23-#33 (DZL_3) for the plaster models and at #17-#43 (DZCM_1) for the printed models. In the reproducibility evaluation, the plaster models showed significant differences between operators at midline, and printed models showed significant differences at 7 measurements including #17-#47(DZR_7).
Conclusion: The validity and reliability of intermaxillary relationships as determined by the printed model were clinically acceptable, but the reproducibility revealed significant inter-operator differences. In order to use printed models as substitutes for plaster models, additional studies of the accuracies of intermaxillary relationship are required.

Keywords: Printed model, Intermaxillary relationship, Interoperator difference