Digital model as an alternative to plaster model in assessment of space analysis

The purpose of this study is to evaluate validity, reliability and reproducibility of tooth width (TW), arch length (AL) and arch length discrepancy (ALD) measured on a digital model taken via 3-dimensional model scanner and intraoral scanner compared to a plaster model. A total of 30 patients aged 12 to 18 were eligible for the study. 3 types of models were acquired from each patient: a conventional plaster model (P), a model scanned digital model (MSD) taken via Freedom UHD® and an intraoral scanned digital model (ISD) taken via CS3600® in-vivo. The reliability of TW and AL in each group was evaluated using Pearson’s correlation coefficient, while the reproducibility was evaluated with intraclass correlation coefficient. The validity of space analysis was assessed by paired t-test. As a result, all measurements of P, MSD and ISD groups showed favorable reliability and reproducibility. Most of measurements for space analysis in MSD group and TW in ISD group also presented high validity. AL and ALD presented statistically significant difference between P and ISD group. The validity of measurements of space analysis in ISD group was short in doubt to valid, but clinically acceptable. Both MSD and ISD are clinically acceptable to use for space analysis but clinician should be aware that errors can be found using a digital model.

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Royal London space analysis: plaster versus digital model assessment

European Journal of Orthodontics ◽

10.1093/ejo/cjw052 ◽

2016 ◽

pp. cjw052

Author(s):

Balpreet Grewal ◽

Robert T Lee ◽

Lifong Zou ◽

Ama Johal

Keyword(s):

Digital Model ◽

Model Assessment ◽

Space Analysis

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

BioMed Research International ◽

10.1155/2018/8414605 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 5

Author(s):

Jae Hee Yoon ◽

Hyung-Seog Yu ◽

Yoonjeong Choi ◽

Tae-Hyun Choi ◽

Sung-Hwan Choi ◽

...

Keyword(s):

Clinical Application ◽

Digital Model ◽

Digital Models ◽

Linear Measurements ◽

Significant Difference ◽

Cast Model ◽

Clinically Significant ◽

Plaster Model ◽

Model C

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 (p<.05), 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.

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Comparing the reliability and accuracy of clinical measurements using plaster model and the digital model system based on crowding severity

Journal of the Chinese Medical Association ◽

10.1016/j.jcma.2017.11.011 ◽

2018 ◽

Vol 81 (9) ◽

pp. 842-847

Author(s):

Yu-Ming Liang ◽

Lalita Rutchakitprakarn ◽

Shou-Hsin Kuang ◽

Tzu-Ying Wu

Keyword(s):

Model System ◽

Digital Model ◽

Clinical Measurements ◽

Plaster Model

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Evaluation of the use of digital study models in postgraduate orthodontic programs in the United States and Canada

The Angle Orthodontist ◽

10.2319/030813-197.1 ◽

2013 ◽

Vol 84 (1) ◽

pp. 62-67 ◽

Cited By ~ 15

Author(s):

Shruti Shastry ◽

Jae Hyun Park

Keyword(s):

United States ◽

New Technology ◽

Three Dimensional ◽

The United States ◽

Digital Model ◽

Digital Models ◽

Electronic Survey ◽

Storage And Retrieval ◽

The Future ◽

Plaster Model

ABSTRACT Objective: To investigate the extent, experience, and trends associated with digital model use, as well as the advantages of using a particular study model type (digital or plaster) in postgraduate orthodontic programs in the United States and Canada. Materials and Methods: An electronic survey consisting of 14 questions was sent to 72 program directors or chairpersons of accredited orthodontic postgraduate programs in the United States and Canada. Results: Fifty-one responded for a 71% response rate. Sixty-five percent of the schools use plaster study models compared with 35% that use digital models. The most common advantages of plaster models were a three-dimensional feel and the ability for them to be mounted on an articulator. The most common advantages of digital models were the ease of storage and retrieval, and the residents' exposure to new technology. About one third of the plaster model users reported that they wanted to switch to digital models in the future, with 12% planning to do so within 1 year. Conclusions: Based on our study, 35% of accredited orthodontic postgraduate programs in the United States and Canada are using digital study models in most cases treated in their programs, and the trend is for increased digital model use in the future.

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Evaluation of the Reliability, Reproducibility and Validity of Digital Orthodontic Measurements Based on Various Digital Models among Young Patients

Journal of Clinical Medicine ◽

10.3390/jcm9092728 ◽

2020 ◽

Vol 9 (9) ◽

pp. 2728 ◽

Cited By ~ 1

Author(s):

Seo-Hyun Park ◽

Soo-Hwan Byun ◽

So-Hee Oh ◽

Hye-Lim Lee ◽

Ju-Won Kim ◽

...

Keyword(s):

Correlation Coefficient ◽

High Reliability ◽

Intraclass Correlation ◽

Young Patients ◽

Digital Model ◽

Good Reliability ◽

Length Discrepancy ◽

Tooth Width ◽

The Difference ◽

Plaster Model

The advantages of intraoral model scanning have yielded recent developments. However, few studies have explored the orthodontic clinical use of this technique particularly among young patients. This study aimed to evaluate the reliability, reproducibility and validity of the orthodontic measurements: tooth width, arch length and arch length discrepancy in each digital model obtained by model scanner and intraoral scanner, relative to a plaster model. Arch length measured using two methods: curved arch length (CAL) measured automatically by digital program and sum of sectional liner arch length (SLAL) measured sum of anterior and posterior liner arch lengths. Arch length discrepancy calculated each arch length measurement methods: curved arch length discrepancy (CALD) and sum of sectional liner arch length discrepancy (SLALD). Forty young patients were eligible for the study. A plaster model (P), model-scanned digital model (MSD) and intraoral scanned digital model (ISD) were acquired from each patient. The reliability of the measurements was evaluated using Pearson’s correlation coefficient, while the reproducibility was evaluated using the intraclass correlation coefficient. The validity was assessed by a paired t-test. All measurements measured in P, MSD and ISD exhibited good reliability and reproducibility. Most orthodontic measurements despite of CAL in MSD exhibited high validity. Only the SLAL and SLALD in ISD group differed significantly, despite the good validity of the tooth width, CAL and CALD. The measurements based on the digital program appeared high reliability, reproducibility and accurate than conventional measurement. However, SLAL and SLALD in ISD group appeared shorter because of distortion during intraoral scanning. However, this could be compensated by using digital programed curved arch. Although the validity of SLAL and SLALD in the ISD group differed statistically, the difference is not considered clinically significant. Although MSD and ISD are acceptable for a clinical space analysis, clinicians should be aware of digital model-induced errors.

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