An evaluation of concordance between linear measurements obtained from conventional, digital and reconstructed three-dimensional printed orthodontic models: An in vitro study (original) (raw)
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F1000Research, 2021
Background: Due to advances in digital technology, it is possible to obtain digital dental models through intraoral scanning. The stereolithographic data collected from the scanner can subsequently be printed into a three-dimensional dental model in resinic material. However, the accuracy between digital dental models and printed dental models needs to be evaluated since it might affect diagnosis and treatment planning in orthodontic treatment. This study aimed to evaluate the accuracy of digital models scanned by a Trios intraoral scanner and three-dimensional dental models printed using a Formlabs 2 3D printer in linear measurements and Bolton analysis. Methods: A total of 35 subjects were included in this study. All subjects were scanned using a Trios intraoral scanner to obtain digital study models. Stereolithographic data from previous scanning was printed using a Formlabs 2 3D printer to obtain printed study models. Mesiodistal, intercanine, intermolar, and Bolton analysis fro...
The effect of two different layer heights on the accuracy of 3-D Printed Orthodontic Models
Background: Additive manufacturing is widely used in the dental field. The accuracy of the printed object produced by additive manufacturer is considered questionable based on the printer’s type, resolution, and the layer height. This study aimed to assess the accuracy of the 3D printed model by DLP technology at 50-µm and 100-µm layer height Methodology: A desktop scanner, R700 desktop scanner (3Shape, Copenhagen, Denmark) was used to scan an orthodontic typo-dent cast to acquire digital scans. A total number of (20) models were printed using a Digital Light Processing 3D printer and divided into two separate group. The 1st group (n=10) and the 2nd (n=10) groups were printed at 50-μm and 100-μm layer heights respectively. All printed models were digitally scanned. Assessment was performed using the GOM Inspect suite to register both the reference and 3D printed digital models to detect the deviation in both X, Y, and Z axes. Results: In the molar area, 50-µm layer thickness showed ...
Reproducibility of linear measurements performed in dental models from 3D printing
Research, Society and Development
This study aimed to assess the reproducibility of linear measurements performed in dental models produced via intraoral scanning and three-dimensional (3D) printing using digital light processing (DLP) and fused deposition modeling (FDM). A sample of 22 participants was selected for this study. Intraoral scanning was performed in each participant with TRIOS™ (3Shape A/S™, Copenhagen, Denmark) device. The digital models were 3D printed using DLP and FDM techniques. Using a caliper, intraoral linear measurements were performed in situ (on the surface of participant’s teeth) and on the 3D printed models. The measurements taken intraoral and on the models were compared using the Intraclass Correlation Coefficient (ICC). The correlation between measurements taken in situ and on DLP models was poor (<0.4), while between in situ and FDM it ranged from poor to satisfactory (<0.75). Generalized linear model showed that the differences did not reach statistically significant levels (p&g...
Accuracy of stereolithographically printed digital models compared to plaster models
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie, 2017
Objective This study compared the accuracy of plaster models from alginate impressions and printed models from intraoral scanning. Materials and methods A total of 28 volunteers were selected and alginate impressions and intraoral scans were used to make plaster models and digital models of their dentition, respectively. The digital models were printed using a stereolithographic (SLA) 3D printer with a horseshoe-shaped design. Two calibrated examiners measured distances on the plaster and printed models with a digital caliper. The paired t test was used to determine intraobserver error and compare the measurements. The Pearson correlation coefficient was used to evaluate the reliability of measurements for each model type. Results The measurements on plaster models and printed models show some significant differences in tooth dimensions and interarch parameters, but these differences were not clinically relevant, except for the transversal measurements. The upper and lower intermolar distances on the printed models were statistically significant and clinically relevant smaller. Conclusions Printed digital models with the SLA 3D printer studied, with a horseshoe-shaped base made from intraoral scans cannot replace conventional plaster models from alginate impressions in orthodontics for diagnosis and treatment planning because of their clinically relevant transversal contraction.
American Journal of Orthodontics and Dentofacial Orthopedics, 2019
Introduction: Emerging workflows in orthodontics enable automated analysis of digital models and production of physical study models from digital files for the evaluation of treatment outcomes. The objective of this study was to compare the automated assessment of digital orthodontic models and the hand grading of 3D-printed models with the use of the American Board of Orthodontics cast-radiograph evaluation (ABO CRE) system. Methods: Plaster models from 15 cases were scanned with the use of a desktop model scanner to create digital models from which physical models were produced with the use of a stereolithography-based 3D printer. All digital models from each case were graded with the use of an automated software tool (SureSmile), and 3D-printed models were scored by hand with the use of the ABO CRE grading system. All hand-graded models were scored a second time at least 2 weeks later. Results: SureSmile gave statistically significantly higher scores to alignment and rotations (P \ 0.001), overjet (P \ 0.001), occlusal contacts (P \ 0.001), and total score (P \ 0.001). Hand grading scored higher in buccolingual inclination (P \ 0.001). No significant differences were found in marginal ridges, occlusal relationships, and interproximal contacts. Conclusions: Scores assessed in an automated manner by SureSmile are generally significantly greater than those assessed by hand grading.
Three-dimensional imaging of orthodontic models: a pilot study
The European Journal of Orthodontics, 2007
Computer-based digital orthodontic models have been developed that have the potential to replace dental casts. The aim of this study was to examine the accuracy and reproducibility of measurements made on digital models. Ten sets of orthodontic study models were scanned using the Arius3D Foundation System and three-dimensional (3D) images were produced by computer software. Two examiners individually measured 11 parameters on the conventional casts and the digital models on two occasions. The parameters included mesio-distal crown diameter, intercanine and intermolar width, arch length, overjet, and incisor crown height. The measurement techniques were compared using paired t-tests, the coeffi cient of reliability, and by calculating mean values and the difference between methods. When comparing measurements made on digital models with those on dental casts, systematic errors were detected for fi ve of the 11 parameters at the 10 per cent level. Random errors were a cause of concern for measurements of three parameters. The most accurate and reproducible measurements were lower intercanine width (mean difference between measurements 0.05 ± 0.32 mm) and overjet (mean difference 0.07 ± 0.33 mm). Most parameters on the digital models can be reliably measured, and digital models can potentially eliminate the requirement for the production and storage of dental casts, but this will depend on cost.
3D Printed Dental Models A comparative analysis
Materiale Plastice
The aim of this study is to compare two different methods used for obtaining printed dental models -intraoral scanning and extraoral scanning; the comparative analysis was made in correlation to the accuracy of the traditional plaster cast model. Nine dental models were obtained: three plaster cast ones, three printed after intraoral scanning and there printed after impression scanning. A total of 137 measurements (arch and tooth measurements) were done on the three types of models and a statistical evaluation was performed (t-test, Fisher Test). Our results highlighted that 3D printed dental models represent a reliable option for clinical application.
A System for Measurements of 3D Scanned Orthodontic Study Models
Contemporary materials, 2017
Plaster dental casts represent an important item in the process of diagnosis, therapy planning and documenting, both in orthodontics, as well as other areas of dentistry. Dental casts allow us to track occlusal contacts before the therapy as well as the changes during the growth and therapy. Although they do possess many positive features, due to the rapid advancements in technology, their negative sides have became more prominent leading to the more widespread use of digital 3D models as their replacement. In this paper, we present a web based system that allows us, after the casts have been scanned, to produce easily usable digital models, to store them and perform measurements on them. Performed measurements are suitable for futher processing and analysis.