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BioMed Research International
Volume 2018 (2018), Article ID 8414605, 9 pages
Research Article

Model Analysis of Digital Models in Moderate to Severe Crowding: In Vivo Validation and Clinical Application

1Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Republic of Korea
2Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Republic of Korea
3Department of Dentistry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea

Correspondence should be addressed to Jung-Yul Cha

Received 25 June 2017; Revised 9 November 2017; Accepted 14 December 2017; Published 14 January 2018

Academic Editor: Margaret A. Niznikiewicz

Copyright © 2018 Jae Hee Yoon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. We investigated the suitability of intraoral-scan models for measuring tooth dimensions and the amount of crowding in patients with severe tooth crowding. Materials and Methods. Fifty-eight patients who had undergone intraoral scans for diagnosis were included. Cast models were divided into two groups depending on the amount of crowding, as determined by initial caliper-based measurements (mild crowding [MC] group: <3.0 mm; severe crowding [SC] group: >4.5 mm). Twenty maxillary models and 20 mandibular models were used in this study. For the three types of models (i.e., IS digital model, C cast model, and CS digital model), the reproducibility and the precision of linear measurements were evaluated. Results. We found that linear measurements made using digital calipers on a plaster model and on the relevant software were reproducible. There was no significant difference in most linear measurements between digital models and the C model. There were differences in the amount of crowding (), although these were not clinically significant. There was no relationship between the precision of crowding in the three types of models and the severity of crowding. Conclusions. Digital models can be used for measuring crowding in both mild and severe crowding cases. However, crowding measured by digital models tends to be lesser than that measured by cast models, and this should be considered during clinical application.