Nanowire enhanced dimensional accuracy in acrylate resin-based 3D printing

This article presents the results of studying the dimensional accuracy of the bases of complete removable prostheses made using a 3D printer and the traditional method. Bases of complete removable prostheses were made using an intraoral laser scanner iTero Cadent (USA) and a 3D printer Asiga Max UV (Australia). To study the dimensional accuracy of the bases of complete removable prostheses, we used the DentalCAD 2.2 Valletta software. The Nonparametric Wilcoxon W-test was used for statistical analysis of the obtained data. We found that the average value of the difference with the standard for bases made using digital technologies is 0.08744±0.0484 mm. The average value of the difference with the standard for bases made by the traditional method is 0.5654±0.1611 mm. Based on these data, we concluded that the bases of complete removable prostheses made using modern digital technologies (intraoral laser scanning and 3D printer) have a higher dimensional accuracy compared to the bases of complete removable prostheses made using the traditional method with a significance level of p<0.05 (Wilcoxon's W-test=0, p=0.031). Keywords: digital technologies in dentistry, digital impressions, intraoral scanner, 3D printing, ExoCAD, complete removable dentures.

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Cost-Effectively 3D-Printed Rigid and Versatile Interpenetrating Polymer Networks

Materials ◽

10.3390/ma14164544 ◽

2021 ◽

Vol 14 (16) ◽

pp. 4544

Author(s):

Osman Konuray ◽

Arnau Sola ◽

Jordi Bonada ◽

Agnieszka Tercjak ◽

Albert Fabregat-Sanjuan ◽

...

Keyword(s):

3D Printing ◽

Polymer Networks ◽

Complex Form ◽

Interpenetrating Polymer Networks ◽

Dual Processing ◽

Digital Light Processing ◽

Superior Mechanical Properties ◽

3D Printed ◽

Acrylate Resin ◽

Printed Materials

Versatile acrylate–epoxy hybrid formulations are becoming widespread in photo/thermal dual-processing scenarios, especially in 3D printing applications. Usually, parts are printed in a stereolithography or digital light processing (DLP) 3D printer, after which a thermal treatment would bestow the final material with superior mechanical properties. We report the successful formulation of such a hybrid system, consisting of a commercial 3D printing acrylate resin modified by an epoxy–anhydride mixture. In the final polymeric network, we observed segregation of an epoxy-rich phase as nano-domains, similar to what was observed in a previous work. However, in the current work, we show the effectiveness of a coupling agent added to the formulation to mitigate this segregation for when such phase separation is undesired. The hybrid materials showed significant improvement of Young’s modulus over the neat acrylate. Once the flexible, partially-cured material was printed with a minimal number of layers, it could be molded into a complex form and thermally cured. Temporary shapes were readily programmable on this final material, with easy shape recovery under mild temperatures. Inspired by repairable 3D printed materials described recently, we manufactured a large object by printing its two halves, and then joined them covalently at the thermal cure stage with an apparently seamless union.

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Research on the dimensional accuracy of customized bone augmentation combined with 3D ‐printing individualized titanium mesh: A retrospective case series study

Clinical Implant Dentistry and Related Research ◽

10.1111/cid.12966 ◽

2020 ◽

Author(s):

Linzhi Li ◽

Chao Wang ◽

Xian Li ◽

Gang Fu ◽

Dan Chen ◽

...

Keyword(s):

3D Printing ◽

Case Series ◽

Dimensional Accuracy ◽

Bone Augmentation ◽

Titanium Mesh ◽

Retrospective Case ◽

Retrospective Case Series ◽

Case Series Study ◽

Series Study

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Compressive Strength and Dimensional Accuracy of Portland Cement Mortar Made Using Powder-Based 3D Printing for Construction Applications

RILEM Bookseries - First RILEM International Conference on Concrete and Digital Fabrication – Digital Concrete 2018 ◽

10.1007/978-3-319-99519-9_23 ◽

2018 ◽

pp. 245-254 ◽

Cited By ~ 4

Author(s):

Ming Xia ◽

Behzad Nematollahi ◽

Jay Sanjayan

Keyword(s):

Compressive Strength ◽

3D Printing ◽

Portland Cement ◽

Cement Mortar ◽

Dimensional Accuracy

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3D printing a mechanically-tunable acrylate resin on a commercial DLP-SLA printer

Additive Manufacturing ◽

10.1016/j.addma.2018.08.019 ◽

2018 ◽

Vol 23 ◽

pp. 374-380 ◽

Cited By ~ 10

Author(s):

Joseph Borrello ◽

Philip Nasser ◽

James C. Iatridis ◽

Kevin D. Costa

Keyword(s):

3D Printing ◽

Acrylate Resin

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Dimensional Accuracy of Parts Manufactured by 3D Printing for Interaction in Virtual Reality

Advances in Science and Technology – Research Journal ◽

10.12913/22998624/80848 ◽

2017 ◽

Vol 11 (4) ◽

pp. 279-285 ◽

Cited By ~ 1

Author(s):

Radosław Wichniarek ◽

Filip Górski ◽

Wiesław Kuczko ◽

Przemysław Zawadzki ◽

Paweł Buń

Keyword(s):

Virtual Reality ◽

3D Printing ◽

Dimensional Accuracy

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Dimensional Tolerance of Casting in the Bridgman Furnace Based on 3D Printing Techniques

Metals ◽

10.3390/met10030299 ◽

2020 ◽

Vol 10 (3) ◽

pp. 299

Author(s):

Xintao Zhu ◽

Fu Wang ◽

Dexin Ma ◽

Andreas Bührig-Polaczek

Keyword(s):

3D Printing ◽

Investment Casting ◽

Systematic Approach ◽

Low Cost ◽

Coordinate Measuring Machine ◽

Dimensional Accuracy ◽

Metal Casting ◽

Measuring Machine ◽

Printing Techniques ◽

Short Times

In this article, the feasibility and the dimensional accuracy based on the 3D printing technology during investment casting of non-vacuum and Bridgman furnace are investigated based on the coordinate measuring machine to calculate the dimensional tolerances through a systematic approach. The research proved that both the investigated RC solutions are effective at obtaining cast technological prototypes in short times and at low cost, with dimensional tolerances that are completely consistent with metal casting processes.

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Design guidelines for plastic casting using 3D printing

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925020916037 ◽

2020 ◽

Vol 15 ◽

pp. 155892502091603 ◽

Cited By ~ 4

Author(s):

Paweł Zmarzły ◽

Damian Gogolewski ◽

Tomasz Kozior

Keyword(s):

Surface Layer ◽

3D Printing ◽

Textile Industry ◽

Dimensional Accuracy ◽

Casting Process ◽

Design Guidelines ◽

Design Stage ◽

Technological Inheritance ◽

Finished Sample

The main aim of the presented tests was to assess the possibility of using 3D printing and casting material to produce casting molds and prototypes, especially in production of existing models. The analysis was based on the assessment of dimensional accuracy and quality of the surface layer of a finished prototype and the intermediate elements made during the production process. The mold was made using the PolyJet Matrix additive technology, and then a silicone mold was cast which was used to prepare a finished sample for testing in accordance with the design assumptions. Based on the results of metrological measurements, the phenomenon of technological inheritance in terms of error transfer in the foundry industry was evaluated. The measurements obtained suggest that in case of casting process, the hereditary features are transferred from individual casting processes, which is especially prominent in the case of surface texture quality. This confirms the occurrence of the phenomenon of the so-called technological inheritance and the need to analyze it. The results of the tests can be a guide for technologists who design molds, core boxes, and casting models, concerning the corrections (shrinkage) that need to be introduced at the design stage in order to obtain a product (casting) of satisfactory dimensional accuracy and quality of the surface layer. The result can also be useful for casting materials reinforced with glass fiber, carbon fiber, which are common materials in 3D printing and textile industry.

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Producing fractures with a 3D-printer for flow experiments – the price to pay for the easy way out

10.5194/egusphere-egu2020-13702 ◽

2020 ◽

Author(s):

Klaus-Peter Kröhn ◽

Michael Kröhn

Keyword(s):

3D Printing ◽

Data Base ◽

Dimensional Accuracy ◽

Transport Processes ◽

Fracture Aperture ◽

Testing Methods ◽

Transparent Material ◽

Smooth Plane ◽

Influence Of Water ◽

Flow Experiments

Recently, the technology of 3D-printing has been applied to literally look into flow and transport processes in fractures and fracture system using transparent material for printing. Preparing some own experiments with printed fractures it was noticed, though, that very little is known about dimensional accuracy of printed components. There are indications that fractures, as a rule of thumb, require an aperture of at least ten times of the printing resolution that is claimed by the manufacturer in order to be water conducting at all. Seemingly little attention has also been paid to the roughness of the printed fracture surfaces that would affect flow in an allegedly smooth plane fracture. Furthermore, the majority of resins&#160; that are used for 3D-printing take up water which leads to swelling of the printed components. This has an up to now unknown influence on fracture aperture.For these reasons a list of simple tests has been developed to check and compare the geometrical and physical properties of printed components right after production and under subsequent influence of water. Varied were printers, materials, sample orientations, sample geometries and postprocessing parameters like curing time. The dimensions of dry and wet samples were meticulously measured. Exemplarily on one sample, also the water uptake dynamics under the influence of water vapour under different degrees of saturation have been determined. A further test concerned the penetration depth of water.The results form a little data base. Sample geometries and testing methods have been kept simple deliberately to allow for a meaningful comparison, not only for ourselves but also for other potential testing parties that might want to contribute data in exchange for the whole data base.The major general conclusion that can be drawn from the tests is that contact time of 3D-prints with water should be minimised if dimensional accuracy is of importance. Tests concerning fracture flow in printed samples thus need to be performed as quickly as possible.

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