Mechanical and geometric properties of thermoformed and 3D printed clear dental aligners

Jindal, Prashant; Juneja, Mamta; Siena, Francesco Luke; Bajaj, Divya; Breedon, Philip

doi:10.1016/j.ajodo.2019.05.012

Cited by 158 publications

(125 citation statements)

References 20 publications

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“…They not only measured the width of arch, but also the mesiodistal dimension and the height of clinical crown. In agreement with the Camdarella et al study, they highlighted that rapid prototyping techniques, such as digital light processing, Polyjet printing, and 3D printing utilizing stone powder could replace stone models in fabrication of orthodontic devices [ 18 ].…”

Section: Discussionsupporting

confidence: 69%

“…Maps of deviation were also made based on the scans. 3D printed models with a horseshoe-shaped base made with the stereolithography were characterized by significant reduction in the transversal dimension, in contrast to models made with the Polyjet technique, which were accurate independently to the shape of base [ 18 ]. A similar problem is investigated in a study by Rungrojwittayakul [ 19 ].…”

Section: Discussionmentioning

confidence: 99%

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Comparison of Dental Stone Models and Their 3D Printed Acrylic Replicas for the Accuracy and Mechanical Properties

et al. 2020

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This study was conducted to test possibilities of application of 3D printed dental models (DMs) in terms of their accuracy and physical properties. In this work, stone models of mandibles were cast from alginate impressions of 10 patients and scanned in order to obtain 3D printed acrylic replicas. The diagnostic value was tested as matching of model scans on three levels: peak of cusps, occlusal surface, and all teeth surfaces. The mechanical properties of acrylic and stone samples, specifically the impact strength, shore D hardness, and flexural and compressive strength were investigated according to ISO standards. The matching of models’ surfaces was the highest on the level of peaks of cusps (average lack of deviations, 0.21 mm) and the lowest on the level of all teeth surfaces (average lack of deviations, 0.64 mm). Acrylic samples subjected to mechanical testing, as expected, showed higher mechanical properties as compared to the specimens made of dental stone. In the present study we demonstrated that 3D printed acrylic models could be ideal representatives in the case of use as a diagnostic tool and as a part of medical records. The acrylic samples exhibited not only higher mechanical properties, but also showed better accuracy comparing to dental stone.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Comparison of Dental Stone Models and Their 3D Printed Acrylic Replicas for the Accuracy and Mechanical Properties

et al. 2020

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“…This kind of thermoformed materials benefit from a highly transparent appearance, but their color changes have been associated with pigment adsorption or penetration of the material surface after immersing in staining agents [ 10 ]. Variations in the color changes are attributed to the materials’ surface characteristics, such as roughness, which might accelerate pigment accumulation [ 16 ]. The study demonstrated that there is a very weak relationship between roughness and color modification.…”

Section: Discussionmentioning

confidence: 99%

“…The national bureau of standards (NBS) system was used to quantify the levels of color change ( Table 3 ). To relate the color change to a clinical standard, the ΔE* values were converted into NBS units: NBS = ΔE* × 0.92 [ 10 , 15 , 16 , 17 , 18 ].…”

Section: Methodsmentioning

confidence: 99%

Surface Quality Evaluation of Removable Thermoplastic Dental Appliances Related to Staining Beverages and Cleaning Agents

et al. 2020

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(1) Background: Thermoplastic materials are not inert and subject to changes in the oral environment, which affect their surface quality. Color stability and topographic characteristics of clear thermoplastic appliances are critical considerations. The study aimed to evaluate the optical changes and surface topography of different thermoplastic materials related to staining beverages and cleaning agents. (2) Methods: Thermoplastic polyethylene terephthalate glycol (PET-G) material specimens were selected for the study: S (Duran, Scheu-Dental GmbH, Iserlohn, Germany), D (Biolon, Dreve Dentamid GmbH, Unna, Germany), and B (Crystal, Bio Art Dental Equipment, Sao Carlos, Brazil). Four different media were involved for immersion: coffee (C) and black tea (T) at 55 °C, Coca-Cola (K) at 5 °C, and distilled water (W) at 22 °C. As for cleaning, chemical options and mechanical brushing were selected (P-powder, T-tablets, and X-brushing). Color changes, and mean surface roughness were measured at 24 h, 48 h, and after 7 days. Statistical analysis was performed. After the testing period, atomic force microscopy (AFM) analyses and SEM images were registered in order to characterize the surface topography. (3) Results: Quantitative color change evaluations revealed a slight change in color after 24 h and an extremely marked change after 48 h, respective 7 days. Mean roughness values are kept below the clinically acceptable limit of 0.20 µm for all samples. Related to mean nanoroughness values Sa, and 3D evaluations of the surface quality, Biolon samples have demonstrated the most constant behavior, while Crystal samples are visibly influenced by water immersion. Related to the cleaning method, the topography of Duran samples was influenced by mechanical brushing. (4) Conclusions: Nanoscale investigations provided high accuracy and more realistic surface quality examinations of the examined samples compared to profilometry. Both SEM and AFM should be used for a more detailed description of the surface topography.

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“…mouthguards (in a biocompatible material). Indeed, in the near future, it is likely that direct printing of biocompatible and relatively flexible retainers / aligners will be feasible (Cole et al, 2019; Jindal et al, 2019; Sherman et al, 2020). The critical considerations for clinical applications are accuracy, precision, ease of use and speed of printing.…”

Section: Introductionmentioning

confidence: 99%

Introducing 3D printing in your orthodontic practice

Cousley¹

2020

J Orthod

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Mechanical and geometric properties of thermoformed and 3D printed clear dental aligners

Cited by 158 publications

References 20 publications

Comparison of Dental Stone Models and Their 3D Printed Acrylic Replicas for the Accuracy and Mechanical Properties

Comparison of Dental Stone Models and Their 3D Printed Acrylic Replicas for the Accuracy and Mechanical Properties

Surface Quality Evaluation of Removable Thermoplastic Dental Appliances Related to Staining Beverages and Cleaning Agents

Introducing 3D printing in your orthodontic practice

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