Accuracy of stereolithographically printed digital models compared to plaster models (original) (raw)
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Acta Marisiensis - Seria Medica
Objective: To evaluate the potential use of digital and reconstructed three-dimensional printed models as an alternative to conventional plaster models by assessing the accuracy of their linear measurements. Methodology: Pre-treatment plaster models of 45 patients were selected from the archives of the Department of Orthodontics. Each physical plaster model was scanned and digitized using a three-dimensional (3D) laser surface scanning system (inEOS X5, Dentsply Sirona, Bensheim, Germany). The scanned STL files were later used to reconstruct models by 3D printing using Figure4® standalone 3D printer (3D systems, Rock Hill, South Carolina). Measurements of teeth 11 and 16, the transverse width of the upper jaw between the first molars (MM - intermolar width) and canines (CC - intercanine width) were done manually using a digital vernier caliper (Mitutoyo, Kawasaki, Japan), and the CAD Assistant software (Open cascade, Guyancourt, France). Intra examiner data, Intraobserver variabilit...
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...
Accuracy of 3-Dimensionally Printed Full-Arch Dental Models: A Systematic Review
Journal of Clinical Medicine , 2020
The use of additive manufacturing in dentistry has exponentially increased with dental model construction being the most common use of the technology. Henceforth, identifying the accuracy of additively manufactured dental models is critical. The objective of this study was to systematically review the literature and evaluate the accuracy of full-arch dental models manufactured using different 3D printing technologies. Seven databases were searched, and 2209 articles initially identified of which twenty-eight studies fulfilling the inclusion criteria were analysed. A meta-analysis was not possible due to unclear reporting and heterogeneity of studies. Stereolithography (SLA) was the most investigated technology, followed by digital light processing (DLP). Accuracy of 3D printed models varied widely between <100 to >500 µm with the majority of models deemed of clinically acceptable accuracy. The smallest (3.3 µm) and largest (579 µm) mean errors were produced by SLA printers. For DLP, majority of investigated printers (n = 6/8) produced models with <100 µm accuracy. Manufacturing parameters, including layer thickness, base design, postprocessing and storage, significantly influenced the model's accuracy. Majority of studies supported the use of 3D printed dental models. Nonetheless, models deemed clinically acceptable for orthodontic purposes may not necessarily be acceptable for the prosthodontic workflow or applications requiring high accuracy.
American Journal of Orthodontics and Dentofacial Orthopedics
Introduction: The aim of this study was to compare the accuracy of printed models from intraoral scans with different designs of model bases, using 2 types of 3-dimensional printing techniques. Methods: Three types of model base design were created: regular base, horseshoe-shaped base, and horseshoe-shaped base with a bar connecting the posterior region. The digital models were printed with the 3-dimensional printers using different techniques: stereolithography and triple jetting technology (polyjet). The printed models were then scanned with a computed tomography scanner and a desktop laser scanner to create the respective digital models. Evaluation of the accuracy was done by measuring the dentitions with Ortho Analyzer software (3Shape, Copenhagen, Denmark) and by model superimposition with Geomagic Qualify software (3D Systems, Rock Hill, SC). An observer measured the distances twice, with an interval of 2 weeks. The accuracy of the printed models was statistically evaluated by the mixed-effects regression model approach. Results: The results showed that printed models made by the polyjet printer were accurate, regardless of the design of the model base. Printed models made with the stereolithography technique with the regular model base and the horseshoe-shaped base with a bar were accurate, but the transversal distances measured on the printed models with a horseshoe-shaped base were statistically significantly smaller. Conclusions: Printed models with a regular base or a horseshoe-shaped base with a bar were accurate regardless of the printing technique used. Printed models with a horseshoe-shaped base made with the stereolithography printer had a statistically significant reduction in the transversal dimension that was not found in the models printed with the polyjet technique.
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie, 2017
Aim The purpose of the present study was to evaluate the accuracy and reproducibility of measurements made on digital models created using an intraoral color scanner compared to measurements on dental plaster models. Methods This study included impressions of 28 volunteers. Alginate impressions were used to make plaster models, and each volunteers' dentition was scanned with a TRIOS Color intraoral scanner. Two examiners performed measurements on the plaster models using a digital caliper and measured the digital models using Ortho Analyzer software. The examiners measured 52 distances, including tooth diameter and height, overjet, overbite, intercanine and intermolar distances, and the sagittal relationship. The paired t test was used to assess intra-examiner performance and measurement accuracy of the two examiners for both plaster and digital models. The level of clinically relevant differences between the measurements according to the threshold used was evaluated and a formula was applied to calculate the chance of finding clinically relevant errors on measurements on plaster and digital models. Results For several parameters, statistically significant differences were found between the measurements on the two different models. However, most of these discrepancies were not considered clinically significant. The measurement of the crown height of upper central incisors had the highest measurement error for both examiners. Based on the interexaminer performance, reproducibility of the measurements was poor for some of the parameters. Conclusions Overall, our findings showed that most of the measurements on digital models created using the TRIOS Color scanner and measured with Ortho Analyzer software had a clinically acceptable accuracy compared to the same measurements made with a caliper on plaster models, but the measuring method can affect the reproducibility of the measurements. Keywords Digital model Á Plaster model Á Dental measurement Á Intraoral scanning Zusammenfassung Zielsetzung Genauigkeit und Reproduzierbarkeit von Messungen auf digitalen Modellen, die nach intraoralen Farbscans hergestellt wurden, sollten verglichen werden mit der Genauigkeit und der Reproduzierbarkeit von auf Gipsmodellen vorgenommenen Messungen. Methoden An der vorliegenden Studie nahmen 28 freiwillige Probanden teil. Zur Anfertigung von Gipsmodellen dienten Alginatabdrücke. Die Bezahnung jedes Probanden wurde mit dem TRIOS Color Intraoralscanner gescannt. Alle Modelle wurden von 2 Untersuchern vermessen: die Gipsmodelle mit einer digitalen Schieblehre, die digitalen Modelle mit der Software Ortho Analyzer. Vermessen wurden 52 Strecken, darunter Leonardo Tavares Camardella: Pos Phd Student.
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 ...
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.
2021
Surgical splints are widely used in orthognathic surgery. The fitting of a surgical splint affects the success of the surgery. Stereolithography (STL), the method used to achieve accurate and reliable input files, is important for the manufacturing process of the surgical splint. Nowadays, data acquisition can be performed with the aid of an intraoral scanner (IOS) or impression materials. This in vitro study aimed to compare the trueness and precision of IOS (TRIOS3®, 3Shape, Copenhagen, Denmark) and alginate impression (Kromopan®, Lascod, Florence, Italy) in a full-arch dental model with/without orthodontic brackets. Custom complete arch models were fabricated with a refractive index similar to that of tooth structure. A TRIOS3® intraoral scanner (3Shape, Copenhagen, Denmark) and an alginate impression were used to duplicate the custom model without orthodontic brackets for complete arch scenarios (both upper and lower arches), n = 5. Subsequently, orthodontic brackets (Ormco®, Gl...
For the fabrication of dental inlays and crowns precise information on patients' teeth morphology is required. Besides the conventional method, where mold materials impressions are prepared, the use of digital scanners is more and more becoming a central part in the nowadays dentistry. The aim of the manuscript is to compare the accuracy of master models based on two intra-oral digital scanners and silicone impressions. A metal cast reference arch model with predefined measurement points was scanned using the Lava™ Chairside Oral Scanner C.O.S. and the iTero™ Intraoral Scanner respectively. These scans were applied for the fabrication of models using rapid prototyping and milling from a proprietary resin. In addition, plaster models were produced using conventional A-silicone impressions. Using a coordinate measuring machine and a micro computed tomography scanner the models were evaluated with micrometer precision. The mean distance deviations from model to model correspond to 112 mm (C.O.S.), 50 mm (iTero™) and 16 mm (gypsum). The results verified the high precision of the conventional technique based on A-silicone impressions and plaster models. The accuracy of the master models obtained on the basis of the digital scans is clinically sufficient to fabricate bridges with up to four units.