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Evans LM, Sözümert E, Keenan BE, Wood CE, du Plessis A. A Review of Image-Based Simulation Applications in High-Value Manufacturing. ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING : STATE OF THE ART REVIEWS 2023; 30:1495-1552. [PMID: 36685137 PMCID: PMC9847465 DOI: 10.1007/s11831-022-09836-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 10/15/2022] [Indexed: 06/17/2023]
Abstract
Image-Based Simulation (IBSim) is the process by which a digital representation of a real geometry is generated from image data for the purpose of performing a simulation with greater accuracy than with idealised Computer Aided Design (CAD) based simulations. Whilst IBSim originates in the biomedical field, the wider adoption of imaging for non-destructive testing and evaluation (NDT/NDE) within the High-Value Manufacturing (HVM) sector has allowed wider use of IBSim in recent years. IBSim is invaluable in scenarios where there exists a non-negligible variation between the 'as designed' and 'as manufactured' state of parts. It has also been used for characterisation of geometries too complex to accurately draw with CAD. IBSim simulations are unique to the geometry being imaged, therefore it is possible to perform part-specific virtual testing within batches of manufactured parts. This novel review presents the applications of IBSim within HVM, whereby HVM is the value provided by a manufactured part (or conversely the potential cost should the part fail) rather than the actual cost of manufacturing the part itself. Examples include fibre and aggregate composite materials, additive manufacturing, foams, and interface bonding such as welding. This review is divided into the following sections: Material Characterisation; Characterisation of Manufacturing Techniques; Impact of Deviations from Idealised Design Geometry on Product Design and Performance; Customisation and Personalisation of Products; IBSim in Biomimicry. Finally, conclusions are drawn, and observations made on future trends based on the current state of the literature.
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Affiliation(s)
- Llion Marc Evans
- Faculty of Science and Engineering, Swansea University, Swansea, SA1 8EN UK
- United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB UK
| | - Emrah Sözümert
- Faculty of Science and Engineering, Swansea University, Swansea, SA1 8EN UK
| | - Bethany E. Keenan
- Cardiff School of Engineering, Cardiff University, Cardiff, CF24 3AA UK
| | - Charles E. Wood
- School of Mechanical & Design Engineering, University of Portsmouth, Portsmouth, PO1 3DJ UK
| | - Anton du Plessis
- Object Research Systems, Montreal, H3B 1A7 Canada
- Research Group 3DInnovation, Stellenbosch University, Stellenbosch, 7602 South Africa
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Pettersson ABV, Ballardini RM, Mimler M, Li P, Salmi M, Minssen T, Gibson I, Mäkitie A. Legal issues and underexplored data protection in medical 3D printing: A scoping review. Front Bioeng Biotechnol 2023; 11:1102780. [PMID: 36923458 PMCID: PMC10009255 DOI: 10.3389/fbioe.2023.1102780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 02/06/2023] [Indexed: 03/03/2023] Open
Abstract
Introduction: 3D printing has quickly found many applications in medicine. However, as with any new technology the regulatory landscape is struggling to stay abreast. Unclear legislation or lack of legislation has been suggested as being one hindrance for wide-scale adoption. Methods: A scoping review was performed in PubMed, Web of Science, SCOPUS and Westlaw International to identify articles dealing with legal issues in medical 3D printing. Results: Thirty-four articles fulfilling inclusion criteria were identified in medical/technical databases and fifteen in the legal database. The majority of articles dealt with the USA, while the EU was also prominently represented. Some common unresolved legal issues were identified, among them terminological confusion between custom-made and patient-matched devices, lack of specific legislation for patient-matched products, and the undefined legal role of CAD files both from a liability and from an intellectual property standpoint. Data protection was mentioned only in two papers and seems an underexplored topic. Conclusion: In this scoping review, several relevant articles and several common unresolved legal issues were identified including a need for terminological uniformity in medical 3D printing. The results of this work are planned to inform our own deeper legal analysis of these issues in the future.
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Affiliation(s)
- Ante B V Pettersson
- Department of Otorhinolaryngology-Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.,Department of Vascular Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.,Department of Surgery, South Karelia Central Hospital, Lappeenranta, Finland
| | | | - Marc Mimler
- The City Law School City, University of London, London, United Kingdom
| | - Phoebe Li
- Sussex Law School, University of Sussex, Brighton, United Kingdom
| | - Mika Salmi
- Department of Mechanical Engineering, Aalto University, Espoo, Finland
| | - Timo Minssen
- Center for Advanced Studies in Biomedical Innovation Law (CeBIL), Faculty of Law, University of Copenhagen, Copenhagen, Denmark
| | - Ian Gibson
- Department of Design, Production and Management, University of Twente, Enschede, Netherlands
| | - Antti Mäkitie
- Department of Otorhinolaryngology-Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.,Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
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Audouard E, Michel F, Pierroz V, Kim T, Rousselot L, Gillet-Legrand B, Dufayet-Chauffaut G, Buchmann P, Florea M, Khel A, Altynbekova K, Delgaldo C, Escudero E, Soler ABA, Cartier N, Piguet F, Folcher M. Bioelectronic cell-based device provides a strategy for the treatment of the experimental model of multiple sclerosis. J Control Release 2022; 352:994-1008. [PMID: 36370877 PMCID: PMC9733677 DOI: 10.1016/j.jconrel.2022.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 10/25/2022] [Accepted: 11/04/2022] [Indexed: 11/18/2022]
Abstract
Wireless powered optogenetic cell-based implant provides a strategy to deliver subcutaneously therapeutic proteins. Immortalize Human Mesenchymal Stem Cells (hMSC-TERT) expressing the bacteriophytochrome diguanylate cyclase (DGCL) were validated for optogenetic controlled interferon-β delivery (Optoferon cells) in a bioelectronic cell-based implant. Optoferon cells transcriptomic profiling was used to elaborate an in-silico model of the recombinant interferon-β production. Wireless optoelectronic device integration was developed using additive manufacturing and injection molding. Implant cell-based optoelectronic interface manufacturing was established to integrate industrial flexible compact low-resistance screen-printed Near Field Communication (NFC) coil antenna. Optogenetic cell-based implant biocompatibility, and device performances were evaluated in the Experimental Autoimmune Encephalomyelitis (EAE) mouse model of multiple sclerosis.
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Affiliation(s)
- Emilie Audouard
- NeuroGenCell, Paris Brain Institute – ICM, INSERM, CNRS, AP-HP, Sorbonne Université; Hôpital de la Pitié Salpêtrière, Paris, France
| | - Fanny Michel
- Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland
| | - Vanessa Pierroz
- Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland
| | - Taeuk Kim
- Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland
| | - Lisa Rousselot
- NeuroGenCell, Paris Brain Institute – ICM, INSERM, CNRS, AP-HP, Sorbonne Université; Hôpital de la Pitié Salpêtrière, Paris, France
| | - Béatrix Gillet-Legrand
- NeuroGenCell, Paris Brain Institute – ICM, INSERM, CNRS, AP-HP, Sorbonne Université; Hôpital de la Pitié Salpêtrière, Paris, France
| | - Gaëlle Dufayet-Chauffaut
- NeuroGenCell, Paris Brain Institute – ICM, INSERM, CNRS, AP-HP, Sorbonne Université; Hôpital de la Pitié Salpêtrière, Paris, France
| | - Peter Buchmann
- Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland
| | - Michael Florea
- Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland
| | | | | | - Claudia Delgaldo
- Eurecat, Centre Tecnològic de Catalunya, Functional Printing and Embedded Devices Unit, Mataró, Spain
| | - Encarna Escudero
- Eurecat, Centre Tecnològic de Catalunya, Functional Printing and Embedded Devices Unit, Mataró, Spain
| | - Alejandra Ben Aissa Soler
- Eurecat, Centre Tecnològic de Catalunya, Functional Printing and Embedded Devices Unit, Mataró, Spain
| | - Nathalie Cartier
- NeuroGenCell, Paris Brain Institute – ICM, INSERM, CNRS, AP-HP, Sorbonne Université; Hôpital de la Pitié Salpêtrière, Paris, France
| | - Francoise Piguet
- NeuroGenCell, Paris Brain Institute – ICM, INSERM, CNRS, AP-HP, Sorbonne Université; Hôpital de la Pitié Salpêtrière, Paris, France
| | - Marc Folcher
- Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland,Institute of Molecular and Clinical Ophthalmology, IOB, Basel, Switzerland,Corresponding author at: Department of Biosystems Science and Engineering, D-BSSE, ETH Zürich, Basel, Switzerland.
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Ikeshoji TT, Yonehara M, Kato C, Yanaga Y, Takeshita K, Kyogoku H. Spattering mechanism of laser powder bed fusion additive manufacturing on heterogeneous surfaces. Sci Rep 2022; 12:20384. [PMID: 36437289 PMCID: PMC9701802 DOI: 10.1038/s41598-022-24828-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 11/21/2022] [Indexed: 11/29/2022] Open
Abstract
Laser powder additive manufacturing (PBF-LB) is an additive manufacturing method capable of producing high-precision and fully dense parts. However, nondestructively quality assurance of no internal defects remains challenging. Mitigating internal defects requires elucidating their formation mechanism and improving the PBF-LB process conditions. Therefore, we developed an in-situ monitoring system that combines surface morphology measurement by fringe projection and thermal field measurement with a high-speed camera. On heterogeneous surfaces in a practical multi-track PBF-LB process, a roughness index of the built part surface altered cyclically, consistent with the change in the angle between laser scanning and atmospheric gas flow. The high-speed camera monitoring showed that the melt pool was asymmetrical and spindle-shaped and that spatter was emitted mainly from the built part side of the melt pool. Furthermore, it was found that the built-part surface morphology under the powder layer affected the stability of the melt pool. As a result, a graphical representation of the melt pool and spattering for heterogeneous surfaces was proposed. Although it is still difficult to theoretically estimate the process window in which no spattering and no internal defects, in-situ monitoring equipment will provide knowledge to elucidate spattering and internal defects formation.
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Affiliation(s)
- Toshi-Taka Ikeshoji
- Research Institute of Fundamental Technology for Next Generation, Kindai University, K.U.RING, 1 Umenobe, Higashi Hiroshima, Hiroshima, 739-2116, Japan. .,Technology Research Association for Future Additive Manufacturing; TRAFAM, 1-10-4 Kajicho, Chiyoda-ku, Tokyo, 101-0044, Japan.
| | - Makiko Yonehara
- Research Institute of Fundamental Technology for Next Generation, Kindai University, K.U.RING, 1 Umenobe, Higashi Hiroshima, Hiroshima, 739-2116, Japan.,Technology Research Association for Future Additive Manufacturing; TRAFAM, 1-10-4 Kajicho, Chiyoda-ku, Tokyo, 101-0044, Japan
| | - Chika Kato
- Nikon Corporation, Shinagawa Intercity Tower C, 2-15-3, Konan, Minato-ku, Minato-Ku, Tokyo, 108-6290, Japan
| | - Yuma Yanaga
- Nikon Corporation, Shinagawa Intercity Tower C, 2-15-3, Konan, Minato-ku, Minato-Ku, Tokyo, 108-6290, Japan
| | - Koki Takeshita
- Nikon Corporation, Shinagawa Intercity Tower C, 2-15-3, Konan, Minato-ku, Minato-Ku, Tokyo, 108-6290, Japan
| | - Hideki Kyogoku
- Research Institute of Fundamental Technology for Next Generation, Kindai University, K.U.RING, 1 Umenobe, Higashi Hiroshima, Hiroshima, 739-2116, Japan. .,Technology Research Association for Future Additive Manufacturing; TRAFAM, 1-10-4 Kajicho, Chiyoda-ku, Tokyo, 101-0044, Japan.
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55
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Chen C, Huang B, Liu Y, Liu F, Lee IS. Functional engineering strategies of 3D printed implants for hard tissue replacement. Regen Biomater 2022; 10:rbac094. [PMID: 36683758 PMCID: PMC9845531 DOI: 10.1093/rb/rbac094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 10/20/2022] [Accepted: 10/27/2022] [Indexed: 11/27/2022] Open
Abstract
Three-dimensional printing technology with the rapid development of printing materials are widely recognized as a promising way to fabricate bioartificial bone tissues. In consideration of the disadvantages of bone substitutes, including poor mechanical properties, lack of vascularization and insufficient osteointegration, functional modification strategies can provide multiple functions and desired characteristics of printing materials, enhance their physicochemical and biological properties in bone tissue engineering. Thus, this review focuses on the advances of functional engineering strategies for 3D printed biomaterials in hard tissue replacement. It is structured as introducing 3D printing technologies, properties of printing materials (metals, ceramics and polymers) and typical functional engineering strategies utilized in the application of bone, cartilage and joint regeneration.
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Affiliation(s)
- Cen Chen
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| | - Bo Huang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
| | - Yi Liu
- Department of Orthodontics, School of Stomatology, China Medical University, Shenyang 110002, PR China
| | - Fan Liu
- Department of Orthodontics, School of Stomatology, China Medical University, Shenyang 110002, PR China
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Expanding Quality by Design Principles to Support 3D Printed Medical Device Development Following the Renewed Regulatory Framework in Europe. Biomedicines 2022; 10:biomedicines10112947. [PMID: 36428514 PMCID: PMC9687721 DOI: 10.3390/biomedicines10112947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/09/2022] [Accepted: 11/11/2022] [Indexed: 11/18/2022] Open
Abstract
The vast scope of 3D printing has ignited the production of tailored medical device (MD) development and catalyzed a paradigm shift in the health-care industry, particularly following the COVID pandemic. This review aims to provide an update on the current progress and emerging opportunities for additive manufacturing following the introduction of the new medical device regulation (MDR) within the EU. The advent of early-phase implementation of the Quality by Design (QbD) quality management framework in MD development is a focal point. The application of a regulatory supported QbD concept will ensure successful MD development, as well as pointing out the current challenges of 3D bioprinting. Utilizing a QbD scientific and risk-management approach ensures the acceleration of MD development in a more targeted way by building in all stakeholders' expectations, namely those of the patients, the biomedical industry, and regulatory bodies.
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57
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Hüner B, Kıstı M, Uysal S, Uzgören İN, Özdoğan E, Süzen YO, Demir N, Kaya MF. An Overview of Various Additive Manufacturing Technologies and Materials for Electrochemical Energy Conversion Applications. ACS OMEGA 2022; 7:40638-40658. [PMID: 36406513 PMCID: PMC9670698 DOI: 10.1021/acsomega.2c05096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Additive manufacturing (AM) technologies have many advantages, such as design flexibility, minimal waste, manufacturing of very complex structures, cheaper production, and rapid prototyping. This technology is widely used in many fields, including health, energy, art, design, aircraft, and automotive sectors. In the manufacturing process of 3D printed products, it is possible to produce different objects with distinctive filament and powder materials using various production technologies. AM covers several 3D printing techniques such as fused deposition modeling (FDM), inkjet printing, selective laser melting (SLM), and stereolithography (SLA). The present review provides an extensive overview of the recent progress in 3D printing methods for electrochemical fields. A detailed review of polymeric and metallic 3D printing materials and their corresponding printing methods for electrodes is also presented. Finally, this paper comprehensively discusses the main benefits and the drawbacks of electrode production from AM methods for energy conversion systems.
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Affiliation(s)
- Bulut Hüner
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
| | - Murat Kıstı
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
| | - Süleyman Uysal
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
- BATARYASAN
Enerji ve San. Tic. Ltd. Şti, Yıldırım
Beyazıt Mah., Aşık Veysel Bul., ERÜ TGB İdare ve Kuluçka 4, No: 67/3/11, Melikgazi, 38039 Kayseri, Turkey
| | - İlayda Nur Uzgören
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
| | - Emre Özdoğan
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
- BATARYASAN
Enerji ve San. Tic. Ltd. Şti, Yıldırım
Beyazıt Mah., Aşık Veysel Bul., ERÜ TGB İdare ve Kuluçka 4, No: 67/3/11, Melikgazi, 38039 Kayseri, Turkey
| | - Yakup Ogün Süzen
- Engineering
Faculty, Department of Mechanical Engineering, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
| | - Nesrin Demir
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
| | - Mehmet Fatih Kaya
- Engineering
Faculty, Energy Systems Engineering Department, Heat Engineering Division, Erciyes University, 38039 Kayseri, Turkey
- Erciyes
University H2FC Hydrogen Energy Research Group, 38039 Kayseri, Turkey
- BATARYASAN
Enerji ve San. Tic. Ltd. Şti, Yıldırım
Beyazıt Mah., Aşık Veysel Bul., ERÜ TGB İdare ve Kuluçka 4, No: 67/3/11, Melikgazi, 38039 Kayseri, Turkey
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Mayfield CK, Ayad M, Lechtholz-Zey E, Chen Y, Lieberman JR. 3D-Printing for Critical Sized Bone Defects: Current Concepts and Future Directions. Bioengineering (Basel) 2022; 9:680. [PMID: 36421080 PMCID: PMC9687148 DOI: 10.3390/bioengineering9110680] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/04/2022] [Accepted: 11/08/2022] [Indexed: 11/15/2023] Open
Abstract
The management and definitive treatment of segmental bone defects in the setting of acute trauma, fracture non-union, revision joint arthroplasty, and tumor surgery are challenging clinical problems with no consistently satisfactory solution. Orthopaedic surgeons are developing novel strategies to treat these problems, including three-dimensional (3D) printing combined with growth factors and/or cells. This article reviews the current strategies for management of segmental bone loss in orthopaedic surgery, including graft selection, bone graft substitutes, and operative techniques. Furthermore, we highlight 3D printing as a technology that may serve a major role in the management of segmental defects. The optimization of a 3D-printed scaffold design through printing technique, material selection, and scaffold geometry, as well as biologic additives to enhance bone regeneration and incorporation could change the treatment paradigm for these difficult bone repair problems.
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Affiliation(s)
- Cory K. Mayfield
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, CA 90033, USA
| | - Mina Ayad
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, CA 90033, USA
| | - Elizabeth Lechtholz-Zey
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, CA 90033, USA
| | - Yong Chen
- Department of Aerospace and Mechanical Engineering, Viterbi School of Engineering, University of Southern California, Los Angleles, CA 90089, USA
| | - Jay R. Lieberman
- Department of Orthopaedic Surgery, Keck School of Medicine of USC, Los Angeles, CA 90033, USA
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Mendaza-DeCal R, Ballesteros Y, Peso-Fernandez S, del Real-Romero JC, Rodriguez-Quiros J. Biomechanical Tests on Long-Bone Elliptical Medullary-Canal Endoprostheses for Limb Salvage in Dogs. Animals (Basel) 2022; 12:ani12213021. [PMID: 36359145 PMCID: PMC9654555 DOI: 10.3390/ani12213021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
Simple Summary Currently, more owners look for offering a better quality of life to their pets. In fact, the complete limb amputation seems to be the last option considered by pet owners in surgeries to save their pets’ lives. Although this field is under development in veterinary medicine, we believe that 3D-printed implants for this market sector will improve the advancement in its research by reducing production costs. This would allow the pet owners to select this solution without large expenses, allowing at the same time, advances in this field. For this purpose, mechanical tests have been carried out on implants printed in a high-performance plastic that resembles the resistance of metals—that are traditionally used in veterinary surgery—and the properties of dogs’ bones as well. The results obtained have confirmed that the implants could withstand the dog weight in its different gaits, although further comparative studies on the effect of rotation forces applied during the animal’s change of direction (evaluated at different paces) are required to confirm their suitability. Abstract Exo-endoprosthesis is a limb salvage procedure poorly described for animals, as only expensive metal devices have been used so far. Currently, additive manufacturing (AM) can make this type of implant affordable by exploring a wide new range of materials. However, safety factors should be considered and could be related to kinetic and kinematic studies of canine natural gaits. The suitability of a novel inner part of an exo-endoprosthesis manufactured by fuse deposition modeling (FDM) was assessed for long canine bones with an elliptical medullary canal. Polyether ether ketone (PEEK) was the material used as an alternative to metal for veterinary traumatology. Poisson’s ratio of 3D-printed PEEK material and ex vivo mechanical tests of the customized endoprosthesis were performed for the evaluation. The customized endoprostheses had promising outcomes for the radii of 20 kg dogs. Quasistatic mechanical tests of bone-inserted endoprostheses—pure compression tests—reached a maximum force of 1045.0 ± 78.0 N. In fatigue tests, the samples reached 500,000 cycles without failure or detriment to their quasistatic results. These outcomes surpass the natural weight-bearing of dogs, even during a galloping pace. Furthermore, torque tests with different adhesives were performed to obtain reference data for future assessments comparing with natural dog movements.
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Affiliation(s)
- Rosa Mendaza-DeCal
- Animal Medicine and Surgery Department, Veterinary Faculty, Complutense University of Madrid, 28040 Madrid, Spain
- Abax Innovation Technologies, 28691 Villanueva de la Cañada, Spain
- Correspondence: ; Tel.: +34-630816789
| | - Yolanda Ballesteros
- Mechanical Engineering Department, Institute for Research in Technology, Universidad Pontificia Comillas, 28015 Madrid, Spain
| | | | - Juan Carlos del Real-Romero
- Mechanical Engineering Department, Institute for Research in Technology, Universidad Pontificia Comillas, 28015 Madrid, Spain
| | - Jesus Rodriguez-Quiros
- Animal Medicine and Surgery Department, Veterinary Faculty, Complutense University of Madrid, 28040 Madrid, Spain
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Soni R, Jhavar S, Tyeb S, Gupta SK, Suwas S, Chatterjee K. Wire Arc Additive Manufacturing of Zinc as a Degradable Metallic Biomaterial. J Funct Biomater 2022; 13:jfb13040212. [PMID: 36412853 PMCID: PMC9680225 DOI: 10.3390/jfb13040212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 10/23/2022] [Accepted: 10/25/2022] [Indexed: 11/06/2022] Open
Abstract
Wire arc additive manufacturing (WAAM) offers a high rate of material deposition among various additive manufacturing techniques with wire as feedstock material but has not been established for zinc alloys. Zn alloys can be used as degradable biomaterials, in contrast to conventional permanent metallic biomaterials. In this work, commercially pure Zn was processed by WAAM to obtain near-dense parts, and the properties obtained through WAAM-processed Zn were compared with wrought (WR) Zn samples. The microstructure and hardness values of the WAAM (41 ± 1 HV0.3) components were found to be similar to those of the WR (35 ± 2 HV0.3) components. Bulk X-ray diffraction texture measurements suggested that WAAM builds exhibit a heavily textured microstructure compared to the WR counterparts, with peak intensities around <3 3−6 2> or <0 0 0 2> in the directions parallel to the build direction (BD). The corrosion rates in simulated body fluid (SBF) were similar for WAAM (0.45 mmpy) and WR (0.3 mmpy) samples. The weight loss measurements in SBF were found to be marginally higher in the WAAM samples compared to the WR counterparts for a duration of up to 21 days. MC3T3-E1 preosteoblasts were found to be healthy and proliferating in the culture medium containing the degradation products from WAAM-Zn in a manner similar to WR-Zn. This work establishes the feasibility of processing Zn by WAAM for use in bioresorbable metallic implants.
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Affiliation(s)
- Rishabh Soni
- Department of Materials Engineering, Indian Institute of Science, Sir C. V. Raman Avenue, Bangalore 560012, India
| | - Suyog Jhavar
- School of Mechanical Engineering, VIT-AP University, Inavolu, Beside AP Secretariat Amaravati, Amaravati 522237, India
| | - Suhela Tyeb
- Department of Materials Engineering, Indian Institute of Science, Sir C. V. Raman Avenue, Bangalore 560012, India
| | - Saurabh Kumar Gupta
- Department of Materials Engineering, Indian Institute of Science, Sir C. V. Raman Avenue, Bangalore 560012, India
| | - Satyam Suwas
- Department of Materials Engineering, Indian Institute of Science, Sir C. V. Raman Avenue, Bangalore 560012, India
| | - Kaushik Chatterjee
- Department of Materials Engineering, Indian Institute of Science, Sir C. V. Raman Avenue, Bangalore 560012, India
- Correspondence: ; Tel.: +91-80-22933408
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Davoodi E, Montazerian H, Mirhakimi AS, Zhianmanesh M, Ibhadode O, Shahabad SI, Esmaeilizadeh R, Sarikhani E, Toorandaz S, Sarabi SA, Nasiri R, Zhu Y, Kadkhodapour J, Li B, Khademhosseini A, Toyserkani E. Additively manufactured metallic biomaterials. Bioact Mater 2022; 15:214-249. [PMID: 35386359 PMCID: PMC8941217 DOI: 10.1016/j.bioactmat.2021.12.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 12/17/2021] [Accepted: 12/21/2021] [Indexed: 02/06/2023] Open
Abstract
Metal additive manufacturing (AM) has led to an evolution in the design and fabrication of hard tissue substitutes, enabling personalized implants to address each patient's specific needs. In addition, internal pore architectures integrated within additively manufactured scaffolds, have provided an opportunity to further develop and engineer functional implants for better tissue integration, and long-term durability. In this review, the latest advances in different aspects of the design and manufacturing of additively manufactured metallic biomaterials are highlighted. After introducing metal AM processes, biocompatible metals adapted for integration with AM machines are presented. Then, we elaborate on the tools and approaches undertaken for the design of porous scaffold with engineered internal architecture including, topology optimization techniques, as well as unit cell patterns based on lattice networks, and triply periodic minimal surface. Here, the new possibilities brought by the functionally gradient porous structures to meet the conflicting scaffold design requirements are thoroughly discussed. Subsequently, the design constraints and physical characteristics of the additively manufactured constructs are reviewed in terms of input parameters such as design features and AM processing parameters. We assess the proposed applications of additively manufactured implants for regeneration of different tissue types and the efforts made towards their clinical translation. Finally, we conclude the review with the emerging directions and perspectives for further development of AM in the medical industry.
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Affiliation(s)
- Elham Davoodi
- Multi-Scale Additive Manufacturing (MSAM) Laboratory, Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
- California NanoSystems Institute (CNSI), University of California, Los Angeles, California 90095, United States
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90024, United States
| | - Hossein Montazerian
- Department of Bioengineering, University of California, Los Angeles, California 90095, United States
- California NanoSystems Institute (CNSI), University of California, Los Angeles, California 90095, United States
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90024, United States
| | - Anooshe Sadat Mirhakimi
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Isfahan 84156-83111, Iran
| | - Masoud Zhianmanesh
- School of Biomedical Engineering, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Osezua Ibhadode
- Multi-Scale Additive Manufacturing (MSAM) Laboratory, Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Shahriar Imani Shahabad
- Multi-Scale Additive Manufacturing (MSAM) Laboratory, Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Reza Esmaeilizadeh
- Multi-Scale Additive Manufacturing (MSAM) Laboratory, Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Einollah Sarikhani
- Department of Nanoengineering, Jacobs School of Engineering, University of California, San Diego, California 92093, United States
| | - Sahar Toorandaz
- Multi-Scale Additive Manufacturing (MSAM) Laboratory, Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Shima A. Sarabi
- Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095, United States
| | - Rohollah Nasiri
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90024, United States
| | - Yangzhi Zhu
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90024, United States
| | - Javad Kadkhodapour
- Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Tehran 16785-163, Iran
- Institute for Materials Testing, Materials Science and Strength of Materials, University of Stuttgart, Stuttgart 70569, Germany
| | - Bingbing Li
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90024, United States
- Department of Manufacturing Systems Engineering and Management, California State University, Northridge, California 91330, United States
| | - Ali Khademhosseini
- Terasaki Institute for Biomedical Innovation, Los Angeles, California 90024, United States
- Corresponding author.
| | - Ehsan Toyserkani
- Multi-Scale Additive Manufacturing (MSAM) Laboratory, Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Corresponding author.
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Ballardini RM, Mimler M, Minssen T, Salmi M. 3D Printing, Intellectual Property Rights and Medical Emergencies: In Search of New Flexibilities. IIC - INTERNATIONAL REVIEW OF INTELLECTUAL PROPERTY AND COMPETITION LAW 2022; 53:1149-1173. [PMID: 36065358 PMCID: PMC9434072 DOI: 10.1007/s40319-022-01235-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Accepted: 08/09/2022] [Indexed: 11/22/2022]
Abstract
The COVID-19 pandemic has exponentially accelerated the use of 3D printing (3DP) technologies in healthcare. Surprisingly, though, we have seen hardly any public intellectual property right (IPR) disputes concerning the 3D-printed medical equipment produced to cope with this crisis. Yet it can be assumed that a great variety of IPRs could potentially have been enforced against the use of various items of equipment printed out without express consent from IP holders. Many reasons might have motivated IP owners not to enforce their rights during the pandemic, such as the fear of acquiring a bad reputation during a declared situation of national emergency. There is no internationally recognised general exception to IPR enforcement for health emergencies, while several − sometimes ineffective − tools, like compulsory licensing, voluntary licensing arrangements and potential TRIPS waivers, have been considered or used to facilitate access to and the distribution of innovations in critical situations. During the COVID-19 emergency, this has meant that the 3DP community has been operating in a state of relative uncertainty including with regard to the risks of IP infringement. This study contextualises these issues for pandemic-relevant 3DP. Building upon experience gathered during the COVID-19 pandemic, we look to the future to see what novel mechanisms within the IPR system could provide the additional flexibility required for dealing more smoothly, with the help and support of digital technologies, with situations such as global health emergencies.
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Wang R, Ni S, Ma L, Li M. Porous construction and surface modification of titanium-based materials for osteogenesis: A review. Front Bioeng Biotechnol 2022; 10:973297. [PMID: 36091459 PMCID: PMC9452912 DOI: 10.3389/fbioe.2022.973297] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 07/29/2022] [Indexed: 11/13/2022] Open
Abstract
Titanium and titanium alloy implants are essential for bone tissue regeneration engineering. The current trend is toward the manufacture of implants from materials that mimic the structure, composition and elasticity of bones. Titanium and titanium alloy implants, the most common materials for implants, can be used as a bone conduction material but cannot promote osteogenesis. In clinical practice, there is a high demand for implant surfaces that stimulate bone formation and accelerate bone binding, thus shortening the implantation-to-loading time and enhancing implantation success. To avoid stress shielding, the elastic modulus of porous titanium and titanium alloy implants must match that of bone. Micro-arc oxidation technology has been utilized to increase the surface activity and build a somewhat hard coating on porous titanium and titanium alloy implants. More recently, a growing number of researchers have combined micro-arc oxidation with hydrothermal, ultrasonic, and laser treatments, coatings that inhibit bacterial growth, and acid etching with sand blasting methods to improve bonding to bone. This paper summarizes the reaction at the interface between bone and implant material, the porous design principle of scaffold material, MAO technology and the combination of MAO with other technologies in the field of porous titanium and titanium alloys to encourage their application in the development of medical implants.
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Affiliation(s)
- Rui Wang
- Department of Stomatology, The Second Hospital of Jilin University, Changchun, China
| | - Shilei Ni
- Department of Plastic and Aesthetic Surgery, Hospital of Stomatology, Jilin University, Changchun, China
| | - Li Ma
- Department of Fever Clinic, The Second Hospital of Jilin University, Changchun, China
| | - Meihua Li
- Department of Stomatology, The Second Hospital of Jilin University, Changchun, China
- *Correspondence: Meihua Li,
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Shen X, Song J, Kawakami K, Ariga K. Molecule-to-Material-to-Bio Nanoarchitectonics with Biomedical Fullerene Nanoparticles. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5404. [PMID: 35955337 PMCID: PMC9369991 DOI: 10.3390/ma15155404] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/28/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
Nanoarchitectonics integrates nanotechnology with various other fields, with the goal of creating functional material systems from nanoscale units such as atoms, molecules, and nanomaterials. The concept bears strong similarities to the processes and functions seen in biological systems. Therefore, it is natural for materials designed through nanoarchitectonics to truly shine in bio-related applications. In this review, we present an overview of recent work exemplifying how nanoarchitectonics relates to biology and how it is being applied in biomedical research. First, we present nanoscale interactions being studied in basic biology and how they parallel nanoarchitectonics concepts. Then, we overview the state-of-the-art in biomedical applications pursuant to the nanoarchitectonics framework. On this basis, we take a deep dive into a particular building-block material frequently seen in nanoarchitectonics approaches: fullerene. We take a closer look at recent research on fullerene nanoparticles, paying special attention to biomedical applications in biosensing, gene delivery, and radical scavenging. With these subjects, we aim to illustrate the power of nanomaterials and biomimetic nanoarchitectonics when applied to bio-related applications, and we offer some considerations for future perspectives.
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Affiliation(s)
- Xuechen Shen
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8561, Chiba, Japan
| | - Jingwen Song
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Kohsaku Kawakami
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Ibaraki, Japan
| | - Katsuhiko Ariga
- Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8561, Chiba, Japan
- WPI Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
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Amaechi CV, Adefuye EF, Kgosiemang IM, Huang B, Amaechi EC. Scientometric Review for Research Patterns on Additive Manufacturing of Lattice Structures. MATERIALS 2022; 15:ma15155323. [PMID: 35955258 PMCID: PMC9369840 DOI: 10.3390/ma15155323] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/22/2022] [Accepted: 07/23/2022] [Indexed: 02/05/2023]
Abstract
Over the past 15 years, interest in additive manufacturing (AM) on lattice structures has significantly increased in producing 3D/4D objects. The purpose of this study is to gain a thorough grasp of the research pattern and the condition of the field’s research today as well as identify obstacles towards future research. To accomplish the purpose, this work undertakes a scientometric analysis of the international research conducted on additive manufacturing for lattice structure materials published from 2002 to 2022. A total of 1290 journal articles from the Web of Science (WoS) database and 1766 journal articles from the Scopus database were found using a search system. This paper applied scientometric science, which is based on bibliometric analysis. The data were subjected to a scientometric study, which looked at the number of publications, authorship, regions by countries, keyword co-occurrence, literature coupling, and scientometric mapping. VOSviewer was used to establish research patterns, visualize maps, and identify transcendental issues. Thus, the quantitative determination of the primary research framework, papers, and themes of this research field was possible. In order to shed light on current developments in additive manufacturing for lattice structures, an extensive systematic study is provided. The scientometric analysis revealed a strong bias towards researching AM on lattice structures but little concentration on technologies that emerge from it. It also outlined its unmet research needs, which can benefit both the industry and academia. This review makes a prediction for the future, with contributions by educating researchers, manufacturers, and other experts on the current state of AM for lattice structures.
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Affiliation(s)
- Chiemela Victor Amaechi
- School of Engineering, Lancaster University, Bailrigg, Lancaster LA1 4YR, UK
- Standards Organisation of Nigeria (SON), 52 Lome Crescent, Wuse Zone 7, Abuja 900287, Federal Capital Territory, Nigeria
- Correspondence: (C.V.A.); (E.F.A.)
| | - Emmanuel Folarin Adefuye
- School of Engineering, Lancaster University, Bailrigg, Lancaster LA1 4YR, UK
- Department of Mechanical/MetalWork Technology, Federal College of Education [Technical], Akoka 100001, Lagos State, Nigeria
- Correspondence: (C.V.A.); (E.F.A.)
| | - Irish Mpho Kgosiemang
- Department of Management, University of Central Lancashire (UCLAN), Preston PR1 2HE, UK;
| | - Bo Huang
- School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
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66
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Prashar G, Vasudev H, Bhuddhi D. Additive manufacturing: expanding 3D printing horizon in industry 4.0. INTERNATIONAL JOURNAL ON INTERACTIVE DESIGN AND MANUFACTURING (IJIDEM) 2022. [PMCID: PMC9256535 DOI: 10.1007/s12008-022-00956-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 04/30/2022] [Indexed: 06/29/2023]
Abstract
Additive Manufacturing (AM) technology enables the production of personalized goods at reduced development costs, shorter lead times, lower energy consumption during manufacturing, and decreased material waste. AM will be consolidated as a leading technology in numerous sectors in the near future due to the maturity of the technology, the wide range of possibilities afforded by 3D printing, and the institutional push. One of the most important aspects of Industry 4.0 is 3D printing. It may be used to fabricate complicated parts and allows companies to cut inventory, develop on-demand items, create smaller localized manufacturing conditions, and even shorten supply chains. AM is expected to increase rapidly in the future because of its above stated remarkable “performance record.“ According to a report published the AM market is predicted to produce US$2 trillion worth of components and end products by year 2030. Hence integration of smart technology and production systems or indirectly one can say that AM is promoting Industry 4.0 and it plays a pivotal role in solving some of the 4th industrial revolution’s most important needs. AM is a future paradigm for futuristic production systems, and Industry 4.0 will leverage its potential to reach essential goals. AM will be found now days in a variety of industrial applications including aerospace and health care to consumer goods. This review article discusses about brief AM technology, history, its industrial applications, challenges, and future prospective. Finally, case studies using AM has been considered.
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Affiliation(s)
- Gaurav Prashar
- School of Mechanical Engineering, Lovely Professional University, 144411 Phagwara, India
| | - Hitesh Vasudev
- School of Mechanical Engineering, Lovely Professional University, 144411 Phagwara, India
| | - Dharam Bhuddhi
- Division of Research and Innovation, Uttaranchal University, 248007 Dehradun, Uttarakhand India
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Investigation of MAO Coatings Characteristics on Titanium Products Obtained by EBM Method Using Additive Manufacturing. MATERIALS 2022; 15:ma15134535. [PMID: 35806660 PMCID: PMC9267494 DOI: 10.3390/ma15134535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/24/2022] [Accepted: 06/25/2022] [Indexed: 02/04/2023]
Abstract
Coatings with a thickness from 27 to 62 µm on electron beam melted Ti-6Al-4V have been formed by micro-arc oxidation (MAO) in a silicate-hypophosphite electrolyte. MAO tests in the anode-cathode mode (50 Hz) with an anode-to-cathode current ratio of 1:1 and sum current densities 10 and 20 A/dm2 were carried out. The duration of the MAO treatment was 30 and 60 min. The effect of the processing parameters on the structural properties of the MAO treated coatings was studied. The current density and treatment time significantly affect the coating thickness and surface roughness. The values of these characteristics increase as the current density increases. The effect of thermal cycling tests on surface morphology, thickness and roughness, and elemental and phase composition of MAO coatings was analyzed. After 50 cycles of thermal cycling from +200 °C to −50 °C, no cracking or delamination of coatings was observed. Coatings formed in 30 min at a current density of 20 A/dm2 turned out to be the best in terms of such indicators as surface morphology, thickness, and roughness.
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68
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Liu C, Xia Z. Additive manufacturing innovation for musculoskeletal tissue repair and regeneration: from bench to bedside. BIOMATERIALS TRANSLATIONAL 2022; 3:99-101. [PMID: 36105566 PMCID: PMC9465994 DOI: 10.12336/biomatertransl.2022.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Chaozong Liu
- Institute of Orthopaedic & Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, London, UK,Corresponding author: Chaozong Liu,
| | - Zhidao Xia
- Centre for Nanohealth, Institute of Life Science, Swansea University Medical School, Faculty of Medicine, Health and Life Science, Swansea, UK
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Shaukat U, Rossegger E, Schlögl S. A Review of Multi-Material 3D Printing of Functional Materials via Vat Photopolymerization. Polymers (Basel) 2022; 14:polym14122449. [PMID: 35746024 PMCID: PMC9227803 DOI: 10.3390/polym14122449] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/08/2022] [Accepted: 06/10/2022] [Indexed: 02/04/2023] Open
Abstract
Additive manufacturing or 3D printing of materials is a prominent process technology which involves the fabrication of materials layer-by-layer or point-by-point in a subsequent manner. With recent advancements in additive manufacturing, the technology has excited a great potential for extension of simple designs to complex multi-material geometries. Vat photopolymerization is a subdivision of additive manufacturing which possesses many attractive features, including excellent printing resolution, high dimensional accuracy, low-cost manufacturing, and the ability to spatially control the material properties. However, the technology is currently limited by design strategies, material chemistries, and equipment limitations. This review aims to provide readers with a comprehensive comparison of different additive manufacturing technologies along with detailed knowledge on advances in multi-material vat photopolymerization technologies. Furthermore, we describe popular material chemistries both from the past and more recently, along with future prospects to address the material-related limitations of vat photopolymerization. Examples of the impressive multi-material capabilities inspired by nature which are applicable today in multiple areas of life are briefly presented in the applications section. Finally, we describe our point of view on the future prospects of 3D printed multi-material structures as well as on the way forward towards promising further advancements in vat photopolymerization.
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Chacón JM, Núñez PJ, Caminero MA, García-Plaza E, Vallejo J, Blanco M. 3D printing of patient-specific 316L–stainless–steel medical implants using fused filament fabrication technology: two veterinary case studies. Biodes Manuf 2022. [DOI: 10.1007/s42242-022-00200-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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71
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Additive Manufacturing of Bulk Thermoelectric Architectures: A Review. ENERGIES 2022. [DOI: 10.3390/en15093121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Additive manufacturing offers several opportunities for thermoelectric energy harvesting systems. This new manufacturing approach enables customized leg geometries, minimized thermal boundary resistances, less retooling, reduced thermoelectric material waste, and strong potential to manipulate microstructure for higher values of figure of merit. Although additive manufacturing has been used to fabricate thin thermoelectric films, there has been comparatively limited demonstrations of additive manufacturing for bulk thermoelectric structures. This review provides insights about the current progress of bulk thermoelectric material and device additive manufacturing. Each additive manufacturing technique used to produce bulk thermoelectric structures is discussed in detail along with future directions and challenges.
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Pantea M, Ciocoiu RC, Greabu M, Ripszky Totan A, Imre M, Țâncu AMC, Sfeatcu R, Spînu TC, Ilinca R, Petre AE. Compressive and Flexural Strength of 3D-Printed and Conventional Resins Designated for Interim Fixed Dental Prostheses: An In Vitro Comparison. MATERIALS 2022; 15:ma15093075. [PMID: 35591410 PMCID: PMC9104158 DOI: 10.3390/ma15093075] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 04/16/2022] [Accepted: 04/20/2022] [Indexed: 12/19/2022]
Abstract
A provisionalization sequence is essential for obtaining a predictable final prosthetic outcome. An assessment of the mechanical behavior of interim prosthetic materials could orient clinicians towards selecting an appropriate material for each clinical case. The aim of this study was to comparatively evaluate the mechanical behavior—with compressive and three-point flexural tests—of certain 3D-printed and conventional resins used to obtain interim fixed dental prostheses. Four interim resin materials were investigated: two 3D-printed resins and two conventional resins (an auto-polymerized resin and a pressure/heat-cured acrylic resin). Cylindrically shaped samples (25 × 25 mm/diameter × height) were obtained for the compression tests and bar-shaped samples (80 × 20 × 5 mm/length × width × thickness) were produced for the flexural tests, observing the producers’ recommendations. The resulting 40 resin samples were subjected to mechanical tests using a universal testing machine. Additionally, a fractographic analysis of failed samples in bending was performed. The results showed that the additive manufactured samples exhibited higher elastic moduli (2.4 ± 0.02 GPa and 2.6 ± 0.18 GPa) than the conventional samples (1.3 ± 0.19 GPa and 1.3 ± 0.38 GPa), as well as a higher average bending strength (141 ± 17 MPa and 143 ± 15 MPa) when compared to the conventional samples (88 ± 10 MPa and 76 ± 7 MPa); the results also suggested that the materials were more homogenous when produced via additive manufacturing.
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Affiliation(s)
- Mihaela Pantea
- Department of Fixed Prosthodontics and Occlusology, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 20221 Bucharest, Romania; (M.P.); (T.C.S.); (A.E.P.)
| | - Robert Cătălin Ciocoiu
- Department of Metallic Materials Science, Physical Metallurgy, University Politehnica of Bucharest, 313 Splaiul Independentei, J Building, 060042 Bucharest, Romania;
| | - Maria Greabu
- Department of Biochemistry, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 020021 Bucharest, Romania; (M.G.); (A.R.T.)
| | - Alexandra Ripszky Totan
- Department of Biochemistry, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 020021 Bucharest, Romania; (M.G.); (A.R.T.)
| | - Marina Imre
- Department of Complete Denture, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 020221 Bucharest, Romania;
| | - Ana Maria Cristina Țâncu
- Department of Complete Denture, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 020221 Bucharest, Romania;
- Correspondence: (A.M.C.Ț.); (R.S.)
| | - Ruxandra Sfeatcu
- Department of Oral Health and Community Dentistry, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Calea Plevnei Street, 010221 Bucharest, Romania
- Correspondence: (A.M.C.Ț.); (R.S.)
| | - Tudor Claudiu Spînu
- Department of Fixed Prosthodontics and Occlusology, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 20221 Bucharest, Romania; (M.P.); (T.C.S.); (A.E.P.)
| | - Radu Ilinca
- Department of Biophysics, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Calea Plevnei Street, 010221 Bucharest, Romania;
| | - Alexandru Eugen Petre
- Department of Fixed Prosthodontics and Occlusology, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, 17-23 Plevnei Street, 20221 Bucharest, Romania; (M.P.); (T.C.S.); (A.E.P.)
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Illi J, Bernhard B, Nguyen C, Pilgrim T, Praz F, Gloeckler M, Windecker S, Haeberlin A, Gräni C. Translating Imaging Into 3D Printed Cardiovascular Phantoms. JACC Basic Transl Sci 2022; 7:1050-1062. [PMID: 36337920 PMCID: PMC9626905 DOI: 10.1016/j.jacbts.2022.01.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/03/2021] [Accepted: 01/03/2022] [Indexed: 11/27/2022]
Abstract
3D printed patient specific phantoms can visualize complex cardiovascular anatomy Common imaging modalities for 3D printing are CCT and CMR Material jetting/PolyJet and stereolithography are widely used printing techniques Standardized validation is warranted to compare different 3D printing technologies
Translation of imaging into 3-dimensional (3D) printed patient-specific phantoms (3DPSPs) can help visualize complex cardiovascular anatomy and enable tailoring of therapy. The aim of this paper is to review the entire process of phantom production, including imaging, materials, 3D printing technologies, and the validation of 3DPSPs. A systematic review of published research was conducted using Embase and MEDLINE, including studies that investigated 3DPSPs in cardiovascular medicine. Among 2,534 screened papers, 212 fulfilled inclusion criteria and described 3DPSPs as a valuable adjunct for planning and guiding interventions (n = 108 [51%]), simulation of physiological or pathological conditions (n = 19 [9%]), teaching of health care professionals (n = 23 [11%]), patient education (n = 3 [1.4%]), outcome prediction (n = 6 [2.8%]), or other purposes (n = 53 [25%]). The most common imaging modalities to enable 3D printing were cardiac computed tomography (n = 131 [61.8%]) and cardiac magnetic resonance (n = 26 [12.3%]). The printing process was conducted mostly by material jetting (n = 54 [25.5%]) or stereolithography (n = 43 [20.3%]). The 10 largest studies that evaluated the geometric accuracy of 3DPSPs described a mean bias <±1 mm; however, the validation process was very heterogeneous among the studies. Three-dimensional printed patient-specific phantoms are highly accurate, used for teaching, and applied to guide cardiovascular therapy. Systematic comparison of imaging and printing modalities following a standardized validation process is warranted to allow conclusions on the optimal production process of 3DPSPs in the field of cardiovascular medicine.
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Buso C, Zanini P, Titotto S. Bioinspired design proposal for a new external bone fixator device. Biomed Phys Eng Express 2022; 8. [PMID: 35100569 DOI: 10.1088/2057-1976/ac5092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 01/31/2022] [Indexed: 11/11/2022]
Abstract
The article presents a new medical device through an authorial and interdisciplinary approach. It consists of a flexible external fixator, whose flexible property may bring advantages over rigid mechanisms. Its design was inspired by the DNA biological mechanism of condensation, while the modeling was based on the pseudo-rigid modeling technique. From the models obtained, this study conducted prototyping and computational tests to obtain a proof-of-concept of the bioinspired theory and dynamic functioning effectiveness. The prototyping relied on hot glue manufacturing and the computational simulations consisted of linear static analysis. The experimental analysis concluded that the prototype with fewer beams and thinner beams delivered better results in all three parameters: flexibility, height variation and rotation arc. In the computational analysis, among the design models with the variation of the number of beams, the model with 8 beams performed better. Concerning thickness variation, the one whose beams measured 8mm in thickness showed better results. Among the models with length variation, the design made with 100 mm long beams better equilibrated the parameters.
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Affiliation(s)
- Carla Buso
- 4D Printing and Biomimetics (4DB) Research Group, Universidade Federal do ABC, Av. dos Estados, 5001 - Bangú, Santo Andre, SP, 09210-170, BRAZIL
| | - Plinio Zanini
- 4D Printing and Biomimetics (4DB) Research Group, Universidade Federal do ABC, Av. dos Estados, 5001 - Bangú, Santo Andre, SP, 09210-170, BRAZIL
| | - Silvia Titotto
- 4D Printing and Biomimetics (4DB) Research Group, Universidade Federal do ABC, Av. dos Estados, 5001 - Bangú, Santo Andre, 09210-170, BRAZIL
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75
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Continuous Fiber-Reinforced Aramid/PETG 3D-Printed Composites with High Fiber Loading through Fused Filament Fabrication. Polymers (Basel) 2022; 14:polym14020298. [PMID: 35054704 PMCID: PMC8778918 DOI: 10.3390/polym14020298] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/07/2022] [Accepted: 01/10/2022] [Indexed: 01/24/2023] Open
Abstract
Recent development in the field of additive manufacturing, also known as three-dimensional (3D) printing, has allowed for the incorporation of continuous fiber reinforcement into 3D-printed polymer parts. These fiber reinforcements allow for the improvement of the mechanical properties, but compared to traditionally produced composite materials, the fiber volume fraction often remains low. This study aims to evaluate the in-nozzle impregnation of continuous aramid fiber reinforcement with glycol-modified polyethylene terephthalate (PETG) using a modified, low-cost, tabletop 3D printer. We analyze how dimensional printing parameters such as layer height and line width affect the fiber volume fraction and fiber dispersion in printed composites. By varying these parameters, unidirectional specimens are printed that have an inner structure going from an array-like to a continuous layered-like structure with fiber loading between 20 and 45 vol%. The inner structure was analyzed by optical microscopy and Computed Tomography (µCT), achieving new insights into the structural composition of printed composites. The printed composites show good fiber alignment and the tensile modulus in the fiber direction increased from 2.2 GPa (non-reinforced) to 33 GPa (45 vol%), while the flexural modulus in the fiber direction increased from 1.6 GPa (non-reinforced) to 27 GPa (45 vol%). The continuous 3D reinforced specimens have quality and properties in the range of traditional composite materials produced by hand lay-up techniques, far exceeding the performance of typical bulk 3D-printed polymers. Hence, this technique has potential for the low-cost additive manufacturing of small, intricate parts with substantial mechanical performance, or parts of which only a small number is needed.
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76
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Salmi M. Modeling, Simulation and Data Processing for Additive Manufacturing. MATERIALS 2021; 14:ma14247755. [PMID: 34947346 PMCID: PMC8706442 DOI: 10.3390/ma14247755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 12/09/2021] [Accepted: 12/13/2021] [Indexed: 11/16/2022]
Abstract
Additive manufacturing or, more commonly, 3D printing is one of the fundamental elements of Industry 4 [...].
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Affiliation(s)
- Mika Salmi
- Department of Mechanical Engineering, Aalto University, 02150 Espoo, Finland
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77
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EL-Ghoul Y, Alminderej FM, Alsubaie FM, Alrasheed R, Almousa NH. Recent Advances in Functional Polymer Materials for Energy, Water, and Biomedical Applications: A Review. Polymers (Basel) 2021; 13:4327. [PMID: 34960878 PMCID: PMC8708011 DOI: 10.3390/polym13244327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/02/2021] [Accepted: 12/06/2021] [Indexed: 01/10/2023] Open
Abstract
Academic research regarding polymeric materials has been of great interest. Likewise, polymer industries are considered as the most familiar petrochemical industries. Despite the valuable and continuous advancements in various polymeric material technologies over the last century, many varieties and advances related to the field of polymer science and engineering still promise a great potential for exciting new applications. Research, development, and industrial support have been the key factors behind the great progress in the field of polymer applications. This work provides insight into the recent energy applications of polymers, including energy storage and production. The study of polymeric materials in the field of enhanced oil recovery and water treatment technologies will be presented and evaluated. In addition, in this review, we wish to emphasize the great importance of various functional polymers as effective adsorbents of organic pollutants from industrial wastewater. Furthermore, recent advances in biomedical applications are reviewed and discussed.
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Affiliation(s)
- Yassine EL-Ghoul
- Department of Chemistry, College of Science, Qassim University, King Abdulaziz Rd, P.O. Box 1162, Buraidah 51452, Saudi Arabia
- Textile Engineering Laboratory, University of Monastir, Monastir 5019, Tunisia
| | - Fahad M. Alminderej
- Department of Chemistry, College of Science, Qassim University, King Abdulaziz Rd, P.O. Box 1162, Buraidah 51452, Saudi Arabia
| | - Fehaid M. Alsubaie
- National Center for Chemical Catalysis Technology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia;
| | - Radwan Alrasheed
- National Center for Desalination & Water Treatment Technology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia;
| | - Norah H. Almousa
- National Center for Chemical Catalysis Technology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia;
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Henry S, De Wever L, Vanhoorne V, De Beer T, Vervaet C. Influence of Print Settings on the Critical Quality Attributes of Extrusion-Based 3D-Printed Caplets: A Quality-by-Design Approach. Pharmaceutics 2021; 13:pharmaceutics13122068. [PMID: 34959349 PMCID: PMC8708825 DOI: 10.3390/pharmaceutics13122068] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/23/2021] [Accepted: 11/29/2021] [Indexed: 12/13/2022] Open
Abstract
Extrusion-based 3D-printing is an easy-to-use, cheap manufacturing technique that could be used to produce tailored precision medicines. The technique has an almost unlimited versatility since a multitude of print parameters can easily be adapted. Unfortunately, little is known of the effect of these print parameters on the critical quality attributes of the resulting printlets. In this study, practical guidelines and means to adapt certain parameters in order to achieve the desired outcome (e.g., acceptable visual quality and flexible dosing) are stipulated for medical 3D-printing using a design-of-experiments approach. The current study aims at elucidating the effect of five print parameters (infill, overlap, number of shells, layer height and layer pattern) on the mechanical properties, dimensions, weight, porosity and dissolution characteristics of a fixed-size caplet consisting of Eudragit EPO (69.3%), Polyox WSR N10 (29.7%) and zolpidem hemitartrate (1%). In terms of the mechanical properties, 3D-printed caplets possessed anisotropy where the vertical compression strength and Brinell hardness exceeded the diametral strength. In general, all 3D-printed caplets possessed acceptable mechanical strength except for a small region of the knowledge space. Dimensional analysis revealed small, statistical significant differences between different runs, although the clinical relevance of this variation is likely negligible. The weight or dose of a caplet can be varied mainly using the infill and overlap and, to a lesser extent, via the layer height and number of shells. The impact on porosity was complicated as this was influenced by many factors and their interactions. Infill was the only statistically relevant factor influencing the dissolution rate of the current formulation. This study unravels the importance of the print parameter overlap, which is a regularly neglected parameter. We also discovered that small dose variations while maintaining the same dissolution profile were possible via modifying the overlap or number of shells. However, large dose variations without affecting the dissolution behaviour could only be accomplished by size modifications of the printlet.
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Affiliation(s)
- Silke Henry
- Laboratory of Pharmaceutical Technology, Ghent University, 9000 Ghent, Belgium; (S.H.); (L.D.W.); (V.V.)
| | - Lotte De Wever
- Laboratory of Pharmaceutical Technology, Ghent University, 9000 Ghent, Belgium; (S.H.); (L.D.W.); (V.V.)
| | - Valérie Vanhoorne
- Laboratory of Pharmaceutical Technology, Ghent University, 9000 Ghent, Belgium; (S.H.); (L.D.W.); (V.V.)
| | - Thomas De Beer
- Laboratory of Pharmaceutical Process Analytical Technology, Ghent University, 9000 Ghent, Belgium;
| | - Chris Vervaet
- Laboratory of Pharmaceutical Technology, Ghent University, 9000 Ghent, Belgium; (S.H.); (L.D.W.); (V.V.)
- Correspondence:
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Rouzé l'Alzit F, Cade R, Naveau A, Babilotte J, Meglioli M, Catros S. Accuracy of commercial 3D printers for the fabrication of surgical guides in dental implantology. J Dent 2021; 117:103909. [PMID: 34852291 DOI: 10.1016/j.jdent.2021.103909] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/20/2021] [Accepted: 11/25/2021] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVES To evaluate the accuracy of two different surgical guides (small extent = single implant and large extent = full arch) fabricated by five additive manufacturing technologies (SLA=Stereolithography, DLP= Digital Light Processing, FDM=Fused Deposition Modeling, SLS=Selective Laser Sintering, Inkjet). METHODS Overall, 72 guides (6 per type) were obtained with the different machines (SLA=Form2; DLP=Rapid Shape D40 and Cara Print 4.0; FDM=Raise 3D Pro2; SLS=Prodways P1000; Polyjet®=Stratasys J750). The guides were surface-scanned with an optical dental scanner, and the resulting files were compared with the initial design files using a surface matching software. Root Mean Square (RMS) and standard deviation were calculated, representing respectively trueness and precision. Kruskall-Wallis non-parametric test was used to compare trueness and precision between small-extent and large-extent guides and 3D printer by pairs. The threshold for significance was α=0.05, except for the comparison of printers by pairs where a Bonferroni-corrected level of 0.0033 was used. RESULTS Significant differences were observed for trueness and precision between small-extent and large-extent guides, regardless the printer except for DLP (trueness and precision) and SLS (precision). SLA, DLP and Polyjet® technologies showed similar results in terms of trueness and precision for both small-extend and large-extend guides (P>0.05). CONCLUSIONS The size affected the accuracy of CAD-CAM surgical guides. The different additive manufacturing technologies had a limited impact on the accuracy. CLINICAL SIGNIFICANCE This study is of clinical interest as it shows that the 3D printing technology (SLA/DLP) has a limited impact on 3D printed surgical guides accuracy. However, the size of the guide can have a significant impact, as small-extent guides were more accurate than large-extent guides.
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Affiliation(s)
- Francois Rouzé l'Alzit
- Institute of Condensed Matter Chemistry of Bordeaux, CNRS UMR5026, University of Bordeaux, Bordeaux, France; Department of prosthodontic dentistry, CHU Bordeaux, Bordeaux, France.
| | | | - Adrien Naveau
- Department of prosthodontic dentistry, CHU Bordeaux, Bordeaux, France; Tissue Bioengineering, INSERM U1026, University of Bordeaux, Bordeaux, France
| | - Joanna Babilotte
- Tissue Bioengineering, INSERM U1026, University of Bordeaux, Bordeaux, France
| | - Matteo Meglioli
- Center of Dental Medicine, Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Sylvain Catros
- Tissue Bioengineering, INSERM U1026, University of Bordeaux, Bordeaux, France; Department of Oral Surgery, CHU Bordeaux, Bordeaux, France
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80
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Lin X, Zhu K, Zhou M, Fuh JYH, Wang QG. Articulated 3D model matching using multi-scale histograms of shape features for customized additive manufacturing. COMPUT IND 2021. [DOI: 10.1016/j.compind.2021.103520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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81
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Porous Titanium by Additive Manufacturing: A Focus on Surfaces for Bone Integration. METALS 2021. [DOI: 10.3390/met11091343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Additive manufacturing (AM) is gaining increasing interest for realization of customized porous titanium constructs for biomedical applications and, in particular, for bone substitution. As first, the present review gives a short introduction on the techniques used for additive manufacturing of Ti/Ti-Alloys (Direct Energy Deposition—DED, Selective Laser Melting—SLM and Electron Beam Melting—EBM) and on the main bulk properties of additively manufactured titanium porous structures. Then, it discusses the main advancements in surface modifications of additively manufactured titanium constructs for bone contact applications. Even if specific surface modifications of constructs from AM are currently not widely explored, it is a critical open issue for application in biomedical implants. Some thermal, chemical, electrochemical, and hydrothermal treatments as well as different coatings are here described. The main aim of these treatments is the development of surface micro/nano textures, specific ion release, and addition of bioactivity to induce bone bonding and antibacterial activity. Physicochemical characterizations, in vitro bioactivity tests, protein absorption, in vitro (cellular/bacterial) and in vivo tests reported in the literature for bare and surface modified AM Ti-based constructs are here reviewed. Future perspectives for development of innovative additively manufactured titanium implants are also discussed.
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82
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Adach M, Sokołowski P, Piwowarczyk T, Nowak K. Study on Geometry, Dimensional Accuracy and Structure of Parts Produced by Multi Jet Fusion. MATERIALS 2021; 14:ma14164510. [PMID: 34443032 PMCID: PMC8398662 DOI: 10.3390/ma14164510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/28/2021] [Accepted: 08/05/2021] [Indexed: 12/04/2022]
Abstract
Multi Jet Fusion (MJF) is one of the newest additive manufacturing technologies for polymer powders, introduced in recent years. This fully industrial technology is gaining big interest as it allows fast, layer-by-layer, printing process, short production cycle, and very high printing resolution. In this paper, twelve thin-walled, spherical PA12 prints were studied in terms of geometry, dimensional accuracy, and fracture surface characteristics. The various characteristic features for MJF prints were observed here for parts produced according to four various print orientations and having different thicknesses, i.e., 1, 2 or 3 mm. The study showed that MJF technology can print such difficult shapes. However, the set of parameters allowing producing parts with highest geometrical and dimensional accuracy causes at the same time some microstructural issues, like great interlayer porosity or high number of non-processed powder particles embedded in the print structure.
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Affiliation(s)
- Martyna Adach
- 3D Center Sp. z o.o., Kwiatkowskiego 4, 52-407 Wroclaw, Poland; (M.A.); (K.N.)
| | - Paweł Sokołowski
- Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland;
- Correspondence:
| | - Tomasz Piwowarczyk
- Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland;
| | - Krzysztof Nowak
- 3D Center Sp. z o.o., Kwiatkowskiego 4, 52-407 Wroclaw, Poland; (M.A.); (K.N.)
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83
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Alqahtani MS, Al-Tamimi AA, Hassan MH, Liu F, Bartolo P. Optimization of a Patient-Specific External Fixation Device for Lower Limb Injuries. Polymers (Basel) 2021; 13:2661. [PMID: 34451198 PMCID: PMC8400870 DOI: 10.3390/polym13162661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/21/2021] [Accepted: 08/02/2021] [Indexed: 11/20/2022] Open
Abstract
The use of external fixation devices is considered a valuable approach for the treatment of bone fractures, providing proper alignment to fractured fragments and maintaining fracture stability during the healing process. The need for external fixation devices has increased due to an aging population and increased trauma incidents. The design and fabrication of external fixations are major challenges since the shape and size of the defect vary, as well as the geometry of the human limb. This requires fully personalized external fixators to improve its fit and functionality. This paper presents a methodology to design personalized lightweight external fixator devices for additive manufacturing. This methodology comprises data acquisition, Computer tomography (CT) imaging analysis and processing, Computer Aided Design (CAD) modelling and two methods (imposed predefined patterns and topology optimization) to reduce the weight of the device. Finite element analysis with full factorial design of experiments were used to determine the optimal combination of designs (topology optimization and predefined patterns), materials (polylactic acid, acrylonitrile butadiene styrene, and polyamide) and thickness (3, 4, 5 and 6 mm) to maximize the strength and stiffness of the fixator, while minimizing its weight. The optimal parameters were found to correspond to an external fixator device optimized by topology optimization, made in polylactic acid with 4 mm thickness.
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Affiliation(s)
- Mohammed S. Alqahtani
- Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11451, Saudi Arabia
- School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK;
| | | | - Mohamed H. Hassan
- School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK;
| | - Fengyuan Liu
- Department of Mechanical Engineering, School of Civil, Aerospace and Mechanical Engineering, Faculty of Engineering, University of Bristol, Bristol BS8 1TR, UK;
| | - Paulo Bartolo
- School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK;
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84
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Taecha-Apaikun K, Pisek P, Suwanprateeb J, Thammarakcharoen F, Arayatrakoollikit U, Angwarawong T, Kongsomboon S, Pisek A. In vitro resorbability and granular characteristics of 3D-printed hydroxyapatite granules versus allograft, xenograft, and alloplast for alveolar cleft surgery applications. Proc Inst Mech Eng H 2021; 235:1288-1296. [PMID: 34289764 DOI: 10.1177/09544119211034370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Three-dimensionally printed hydroxyapatite (3DP HA) was investigated in regards to its functional properties supporting bone regeneration and tooth movement in alveolar cleft applications. Commercially available bovine xenograft (BXG), biphasic calcium phosphate alloplast (BCP), and two types of freeze-dried bone allograft granules (FDBA and FDBA-CMC) were employed as control samples. Degradability was studied by submerging the samples in pH 7.4 buffered solution at 37°C for 28 days and determining subsequent weight loss percentage. The wicking property and granular agglomeration were evaluated by putting the granules in contact with deionized water, blood, and phosphate-buffered saline (PBS). Both of FDBA and FDBA-CMC showed the greatest weight loss at 28 days followed by 3DP HA. In contrast, 3DP HA showed significantly greater wicking ability than other samples for all liquid types. FDBA-CMC exhibited the greatest granular agglomeration for all liquid types followed by 3DP HA. 3DP HA was found to be a favorable candidate for bone grafting in alveolar cleft treatment.
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Affiliation(s)
- Kongkrit Taecha-Apaikun
- Department of Preventive Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
| | - Poonsak Pisek
- Department of Preventive Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
| | - Jintamai Suwanprateeb
- Biofunctional Materials and Devices Research Group, National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, Thailand
| | - Faungchat Thammarakcharoen
- Biofunctional Materials and Devices Research Group, National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, Thailand
| | | | - Thidarat Angwarawong
- Department of Prosthodontics, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
| | - Supaporn Kongsomboon
- Department of Oral and maxillofacial Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
| | - Araya Pisek
- Department of Preventive Dentistry, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
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A Review on Filament Materials for Fused Filament Fabrication. JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING 2021. [DOI: 10.3390/jmmp5030069] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Fused filament fabrication (FFF) is one of the most popular additive manufacturing (AM) processes that utilize thermoplastic polymers to produce three-dimensional (3D) geometry products. The FFF filament materials have a significant role in determining the properties of the final part produced, such as mechanical properties, thermal conductivity, and electrical conductivity. This article intensively reviews the state-of-the-art materials for FFF filaments. To date, there are many different types of FFF filament materials that have been developed. The filament materials range from pure thermoplastics to composites, bioplastics, and composites of bioplastics. Different types of reinforcements such as particles, fibers, and nanoparticles are incorporated into the composite filaments to improve the FFF build part properties. The performance, limitations, and opportunities of a specific type of FFF filament will be discussed. Additionally, the challenges and requirements for filament production from different materials will be evaluated. In addition, to provide a concise review of fundamental knowledge about the FFF filament, this article will also highlight potential research directions to stimulate future filament development. Finally, the importance and scopes of using bioplastics and their composites for developing eco-friendly filaments will be introduced.
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86
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Zaszczyńska A, Moczulska-Heljak M, Gradys A, Sajkiewicz P. Advances in 3D Printing for Tissue Engineering. MATERIALS (BASEL, SWITZERLAND) 2021; 14:3149. [PMID: 34201163 PMCID: PMC8226963 DOI: 10.3390/ma14123149] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 06/01/2021] [Accepted: 06/04/2021] [Indexed: 12/18/2022]
Abstract
Tissue engineering (TE) scaffolds have enormous significance for the possibility of regeneration of complex tissue structures or even whole organs. Three-dimensional (3D) printing techniques allow fabricating TE scaffolds, having an extremely complex structure, in a repeatable and precise manner. Moreover, they enable the easy application of computer-assisted methods to TE scaffold design. The latest additive manufacturing techniques open up opportunities not otherwise available. This study aimed to summarize the state-of-art field of 3D printing techniques in applications for tissue engineering with a focus on the latest advancements. The following topics are discussed: systematics of the available 3D printing techniques applied for TE scaffold fabrication; overview of 3D printable biomaterials and advancements in 3D-printing-assisted tissue engineering.
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Affiliation(s)
- Angelika Zaszczyńska
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5b St., 02-106 Warsaw, Poland
| | - Maryla Moczulska-Heljak
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5b St., 02-106 Warsaw, Poland
| | - Arkadiusz Gradys
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5b St., 02-106 Warsaw, Poland
| | - Paweł Sajkiewicz
- Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5b St., 02-106 Warsaw, Poland
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87
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Spinelli G, Guarini R, Kotsilkova R, Ivanov E, Romano V. Experimental, Theoretical and Simulation Studies on the Thermal Behavior of PLA-Based Nanocomposites Reinforced with Different Carbonaceous Fillers. NANOMATERIALS 2021; 11:nano11061511. [PMID: 34200476 PMCID: PMC8226525 DOI: 10.3390/nano11061511] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/01/2021] [Accepted: 06/03/2021] [Indexed: 01/25/2023]
Abstract
Many research efforts have been directed towards enhancing the thermal properties of polymers, since they are classically regarded as thermal insulators. To this end, the present study focuses on the thermal investigation of poly(lactic acid) (PLA) filled with two types of carbon nanotubes (trade names: TNIMH4 and N7000), two type of graphene nanoplatelets (trade names: TNIGNP and TNGNP), or their appropriate combination. A significant increase in the thermal conductivity by 254% with respect to that of unfilled polymer was achieved in the best case by using 9 wt% TNIGNP, resulting from its favorable arrangement and the lower thermal boundary resistance between the two phases, matrix and filler. To theoretically assist the design of such advanced nanocomposites, Design of Experiments (DoE) and Response Surface Method (RSM) were employed, respectively, to obtain information on the conditioning effect of each filler loading on the thermal conductivity and to find an analytical relationship between them. The numerical results were compared with the experimental data in order to confirm the reliability of the prediction. Finally, a simulation study was carried out with Comsol Multiphysics® for a comparative study between two heat sinks based on pure PLA, and to determine the best thermally performing nanocomposite with a view towards potential use in heat transfer applications.
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Affiliation(s)
- Giovanni Spinelli
- Open Laboratory on Experimental Micro and Nano Mechanics (OLEM), Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Block 4, 1113 Sofia, Bulgaria; (R.G.); (R.K.); (E.I.)
- Correspondence: ; Tel.: +359-2-979-6476
| | - Rosella Guarini
- Open Laboratory on Experimental Micro and Nano Mechanics (OLEM), Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Block 4, 1113 Sofia, Bulgaria; (R.G.); (R.K.); (E.I.)
| | - Rumiana Kotsilkova
- Open Laboratory on Experimental Micro and Nano Mechanics (OLEM), Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Block 4, 1113 Sofia, Bulgaria; (R.G.); (R.K.); (E.I.)
| | - Evgeni Ivanov
- Open Laboratory on Experimental Micro and Nano Mechanics (OLEM), Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Block 4, 1113 Sofia, Bulgaria; (R.G.); (R.K.); (E.I.)
- Research and Development of Nanomaterials and Nanotechnologies (NanoTech Lab Ltd.), Acad. G. Bonchev Str. Block 4, 1113 Sofia, Bulgaria
| | - Vittorio Romano
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy;
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Abbas MZ. Industrial applications of 3D printing to scale-up production of COVID-19-related medical equipment. JOURNAL OF 3D PRINTING IN MEDICINE 2021; 5:97-110. [PMID: 38051991 PMCID: PMC8357186 DOI: 10.2217/3dp-2021-0003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 07/27/2021] [Indexed: 12/23/2022]
Abstract
Additive manufacturing or 3D printing allows the rapid conversion of information from digital 3D models into physical objects. The current COVID-19 crisis underscored the value of 3D-printing technology in addressing critical shortages in the medical product supply chain. This article provides a review of the significant role of additive manufacturing technologies in addressing the COVID-19 situation. This article concludes that 3D printing has an important role in global public health because of its potential to adapt to emerging situations far more easily and quickly as compared with conventional manufacturing methods. There is a need for further research to improve the technology to mass produce better quality products more economically. Currently, the 3D-printing industry is concentrated in the US and Western Europe. Policy efforts are needed to tap all markets across the globe in order to be better prepared for a future pandemic.
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Affiliation(s)
- Muhammad Zaheer Abbas
- Faculty of Business and Law, Queensland University of Technology, Brisbane, Australia
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90
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Abdollahiyan P, Oroojalian F, Hejazi M, de la Guardia M, Mokhtarzadeh A. Nanotechnology, and scaffold implantation for the effective repair of injured organs: An overview on hard tissue engineering. J Control Release 2021; 333:391-417. [DOI: 10.1016/j.jconrel.2021.04.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 03/31/2021] [Accepted: 04/02/2021] [Indexed: 12/17/2022]
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91
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Lim JH, Bayarsaikhan E, Shin SH, Nam NE, Shim JS, Kim JE. Effects of Groove Sealing of the Posterior Occlusal Surface and Offset of the Internal Surface on the Internal Fit and Accuracy of Implant Placements Using 3D-Printed Surgical Guides: An In Vitro Study. Polymers (Basel) 2021; 13:polym13081236. [PMID: 33920389 PMCID: PMC8070577 DOI: 10.3390/polym13081236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/08/2021] [Accepted: 04/08/2021] [Indexed: 11/16/2022] Open
Abstract
This study evaluated the internal fit and the accuracy of the implant placement position in order to determine how the surface shape of the tooth and the offset influence the accuracy of the surgical guide. The acquired digital data were analyzed in three dimensions using 3D inspection software. The obtained results confirmed that the internal fit was better in the groove sealing (GS) group (164.45 ± 28.34 μm) than the original shape (OS) group (204.07 ± 44.60 μm) (p < 0.001), and for an offset of 100 μm (157.50 ± 17.26 μm) than for offsets of 30 μm (206.48 ± 39.12 μm) and 60 μm (188.82 ± 48.77 μm) (p < 0.001). The accuracy of implant placement was better in the GS than OS group in terms of the entry (OS, 0.229 ± 0.092 mm; GS, 0.169 ± 0.061 mm; p < 0.001), apex (OS, 0.324 ± 0.149 mm; GS, 0.230 ± 0.124 mm; p < 0.001), and depth (OS, 0.041 ± 0.027 mm; GS, 0.025 ± 0.022 mm; p < 0.001). In addition, the entries (30 μm, 0.215 ± 0.044 mm; 60 μm, 0.172 ± 0.049 mm; 100 μm, 0.119 ± 0.050 mm; p < 0.001) were only affected by the amount of offset. These findings indicate that the accuracy of a surgical guide can be improved by directly sealing the groove of the tooth before manufacturing the surgical guide or setting the offset during the design process.
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Affiliation(s)
- Jung-Hwa Lim
- Department of Prosthodontics, Oral Research Science Center, BK21 FOUR Project, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea; (J.-H.L.); (S.-H.S.); (N.-E.N.)
| | - Enkhjargal Bayarsaikhan
- Department of Prosthodontics, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea; (E.B.); (J.-S.S.)
| | - Seung-Ho Shin
- Department of Prosthodontics, Oral Research Science Center, BK21 FOUR Project, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea; (J.-H.L.); (S.-H.S.); (N.-E.N.)
| | - Na-Eun Nam
- Department of Prosthodontics, Oral Research Science Center, BK21 FOUR Project, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea; (J.-H.L.); (S.-H.S.); (N.-E.N.)
| | - June-Sung Shim
- Department of Prosthodontics, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea; (E.B.); (J.-S.S.)
| | - Jong-Eun Kim
- Department of Prosthodontics, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea; (E.B.); (J.-S.S.)
- Correspondence: ; Tel.: +82-2-2228-3160
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92
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Sharma N, Ostas D, Rotar H, Brantner P, Thieringer FM. Design and Additive Manufacturing of a Biomimetic Customized Cranial Implant Based on Voronoi Diagram. Front Physiol 2021; 12:647923. [PMID: 33897455 PMCID: PMC8063040 DOI: 10.3389/fphys.2021.647923] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 03/15/2021] [Indexed: 12/21/2022] Open
Abstract
Reconstruction of cranial defects is an arduous task for craniomaxillofacial surgeons. Additive manufacturing (AM) or three-dimensional (3D) printing of titanium patient-specific implants (PSIs) made its way into cranioplasty, improving the clinical outcomes in complex surgical procedures. There has been a significant interest within the medical community in redesigning implants based on natural analogies. This paper proposes a workflow to create a biomimetic patient-specific cranial prosthesis with an interconnected strut macrostructure mimicking bone trabeculae. The method implements an interactive generative design approach based on the Voronoi diagram or tessellations. Furthermore, the quasi-self-supporting fabrication feasibility of the biomimetic, lightweight titanium cranial prosthesis design is assessed using Selective Laser Melting (SLM) technology.
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Affiliation(s)
- Neha Sharma
- Clinic of Oral and Cranio-Maxillofacial Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedical Engineering, Medical Additive Manufacturing Research Group (SwissMAM), University of Basel, Allschwil, Switzerland
| | - Daniel Ostas
- Department of Oral and Cranio-Maxillofacial Surgery, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Horatiu Rotar
- Department of Oral and Cranio-Maxillofacial Surgery, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Philipp Brantner
- Department of Biomedical Engineering, Medical Additive Manufacturing Research Group (SwissMAM), University of Basel, Allschwil, Switzerland.,Department of Radiology and Nuclear Medicine, University Hospital Basel, Basel, Switzerland
| | - Florian Markus Thieringer
- Clinic of Oral and Cranio-Maxillofacial Surgery, University Hospital Basel, Basel, Switzerland.,Department of Biomedical Engineering, Medical Additive Manufacturing Research Group (SwissMAM), University of Basel, Allschwil, Switzerland
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93
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Quality Control in 3D Printing: Accuracy Analysis of 3D-Printed Models of Patient-Specific Anatomy. MATERIALS 2021; 14:ma14041021. [PMID: 33670038 PMCID: PMC7926654 DOI: 10.3390/ma14041021] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/11/2021] [Accepted: 02/16/2021] [Indexed: 02/07/2023]
Abstract
As comparative data on the precision of 3D-printed anatomical models are sparse, the aim of this study was to evaluate the accuracy of 3D-printed models of vascular anatomy generated by two commonly used printing technologies. Thirty-five 3D models of large (aortic, wall thickness of 2 mm, n = 30) and small (coronary, wall thickness of 1.25 mm, n = 5) vessels printed with fused deposition modeling (FDM) (rigid, n = 20) and PolyJet (flexible, n = 15) technology were subjected to high-resolution CT scans. From the resulting DICOM (Digital Imaging and Communications in Medicine) dataset, an STL file was generated and wall thickness as well as surface congruency were compared with the original STL file using dedicated 3D engineering software. The mean wall thickness for the large-scale aortic models was 2.11 µm (+5%), and 1.26 µm (+0.8%) for the coronary models, resulting in an overall mean wall thickness of +5% for all 35 3D models when compared to the original STL file. The mean surface deviation was found to be +120 µm for all models, with +100 µm for the aortic and +180 µm for the coronary 3D models, respectively. Both printing technologies were found to conform with the currently set standards of accuracy (<1 mm), demonstrating that accurate 3D models of large and small vessel anatomy can be generated by both FDM and PolyJet printing technology using rigid and flexible polymers.
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