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https://www.readbyqxmd.com/read/28436920/hybrid-3d-printing-and-electrodeposition-approach-for-controllable-3d-alginate-hydrogel-formation
#1
Wanfeng Shang, Yanting Liu, Wenfeng Wan, Chengzhi Hu, Zeyang Liu, Chin To Wong, Toshio Fukuda, Yajing Shen
Calcium alginate hydrogel is one of the most widely used biocompatible materials in biomedical and tissue engineering. This paper reports a hybrid 3D printing and electrodeposition approach to form the 3D calcium alginate hydrogel in a controllable manner. Firstly, a specific 3D printing system is developed by combining a 3D printer and a customized ejection syringe. Then, the mixed solution (1% w/v sodium alginate and 0.25% w/v CaCO3 nano particles) is filled in the syringe and ejected out from the nozzle to the substrate continuously...
April 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28434826/the-accuracy-of-patient-specific-implant-prebented-with-3d-printed-rapid-prototype-model-for-orbital-wall-reconstruction
#2
Young Chul Kim, Woo Shik Jeong, Tae-Kyung Park, Jong Woo Choi, Kyung S Koh, Tae Suk Oh
BACKGROUND: This study evaluated the accuracy of blow out fracture reduction using 3D-printed rapid prototyping (RP) skull modeling. PATIENTS AND METHODS: Retrospective review was performed for 82 patients who underwent post-traumatic orbital wall fracture reduction between 2012 and 2014. Patients were divided into two groups according to the use of 3D-printed RP skull model reproduced by mirroring technique, onto which a titanium mesh was anatomically molded. Using computed tomographic scans, the areas of pre- and post-operative orbital wall defect, the layout angles of the titanium mesh, and the gap lengths between the implant and fracture margin were compared between the two groups...
March 27, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28433241/mechanics-of-additively-manufactured-biomaterials
#3
EDITORIAL
Amir A Zadpoor
Additive manufacturing (3D printing) has found many applications in healthcare including fabrication of biomaterials as well as bioprinting of tissues and organs. Additively manufactured (AM) biomaterials may possess arbitrarily complex micro-architectures that give rise to novel mechanical, physical, and biological properties. The mechanical behavior of such porous biomaterials including their quasi-static mechanical properties and fatigue resistance is not yet well understood. It is particularly important to understand the relationship between the designed micro-architecture (topology) and the resulting mechanical properties...
June 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28433213/three-dimensional-surgical-modelling-with-an-open-source-software-protocol-study-of-precision-and-reproducibility-in-mandibular-reconstruction-with-the-fibula-free-flap
#4
L Ganry, J Quilichini, C M Bandini, P Leyder, B Hersant, J P Meningaud
Very few surgical teams currently use totally independent and free solutions to perform three-dimensional (3D) surgical modelling for osseous free flaps in reconstructive surgery. This study assessed the precision and technical reproducibility of a 3D surgical modelling protocol using free open-source software in mandibular reconstruction with fibula free flaps and surgical guides. Precision was assessed through comparisons of the 3D surgical guide to the sterilized 3D-printed guide, determining accuracy to the millimetre level...
April 19, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28428658/what-radiologists-need-to-know-about-3d-printing-and-its-main-applications-in-musculoskeletal-imaging
#5
Francisco Abaeté Chagas-Neto, Francisco Coracy Carneiro Monteiro, Eduardo Lima da Rocha, Everaldo Gregio-Junior, Marcello Henrique Nogueira-Barbosa
No abstract text is available yet for this article.
March 2017: Radiologia Brasileira
https://www.readbyqxmd.com/read/28428623/paper-strip-embedded-graphene-quantum-dots-a-screening-device-with-a-smartphone-readout
#6
Ruslan Álvarez-Diduk, Jahir Orozco, Arben Merkoçi
Simple, inexpensive and rapid sensing systems are very demanded for a myriad of uses. Intrinsic properties of emerging paper-based analytical devices have demonstrated considerable potential to fulfill such demand. This work reports an easy-to-use, low cost, and disposable paper-based sensing device for rapid chemical screening with a smartphone readout. The device comprises luminescent graphene quantum dots (GQDs) sensing probes embedded into a nitrocellulose matrix where the resonance energy transfer phenomenon seems to be the sensing mechanism...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28428596/the-latest-generation-of-3d-printing
#7
(no author information available yet)
No abstract text is available yet for this article.
April 21, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28428034/near-anatomical-correction-using-a-ct-guided-technique-of-a-forearm-malunion-in-a-15-year-old-girl-a-case-report-including-surgical-technique
#8
Ralph M Jeuken, Roel P Hendrickx, Martijn G Schotanus, Edwin J Jansen
BACKGROUND: In this case report we describe a left-arm both-bone forearm fracture in a 15-year old girl who fell off of a swing. Conservative treatment with an above-elbow cast failed,resulting in a malunion with functional impairment. The pro- and supination were 90/0/10, respectively. The patient complained of difficulties performing daily activities. For this pediatric case a corrective osteotomy was proposed using a CT-guided technique aiming for maximum anatomical and functional outcome...
April 17, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28425999/three-dimensional-printing-of-transparent-fused-silica-glass
#9
Frederik Kotz, Karl Arnold, Werner Bauer, Dieter Schild, Nico Keller, Kai Sachsenheimer, Tobias M Nargang, Christiane Richter, Dorothea Helmer, Bastian E Rapp
Glass is one of the most important high-performance materials used for scientific research, in industry and in society, mainly owing to its unmatched optical transparency, outstanding mechanical, chemical and thermal resistance as well as its thermal and electrical insulating properties. However, glasses and especially high-purity glasses such as fused silica glass are notoriously difficult to shape, requiring high-temperature melting and casting processes for macroscopic objects or hazardous chemicals for microscopic features...
April 19, 2017: Nature
https://www.readbyqxmd.com/read/28425137/three-dimensional-printing-an-aid-to-epidural-access-for-neuromodulation
#10
Murray G Taverner, John P Monagle
OBJECTIVE: The case report details to use of three-dimensional (3D) printing as an aid to neuromodulation. METHODS: A patient is described in whom previous attempts at spinal neuromodulation had failed due to lack of epidural or intrathecal access, and the use of a 3D printed model allowed for improved planning and ultimately, success. RESULTS: Successful spinal cord stimulation was achieved with the plan developed by access to a 3D model of the patient's spine...
April 20, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28425028/energy-harvesting-from-cerebrospinal-fluid-pressure-fluctuations-for-self-powered-neural-implants
#11
Levent Beker, Arnau Benet, Ali Tayebi Meybodi, Ben Eovino, Albert P Pisano, Liwei Lin
In this paper, a novel method to generate electrical energy by converting available mechanical energy from pressure fluctuations of the cerebrospinal fluid within lateral ventricles of the brain is presented. The generated electrical power can be supplied to the neural implants and either eliminate their battery need or extend the battery lifespan. A diaphragm type harvester comprised of piezoelectric material is utilized to convert the pressure fluctuations to electrical energy. The pressure fluctuations cause the diaphragm to bend, and the strained piezoelectric materials generate electricity...
June 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28424770/recent-advances-in-bioink-design-for-3d-bioprinting-of-tissues-and-organs
#12
REVIEW
Shen Ji, Murat Guvendiren
There is a growing demand for alternative fabrication approaches to develop tissues and organs as conventional techniques are not capable of fabricating constructs with required structural, mechanical, and biological complexity. 3D bioprinting offers great potential to fabricate highly complex constructs with precise control of structure, mechanics, and biological matter [i.e., cells and extracellular matrix (ECM) components]. 3D bioprinting is an additive manufacturing approach that utilizes a "bioink" to fabricate devices and scaffolds in a layer-by-layer manner...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28422253/3d-printed-poly-vinylidene-fluoride-carbon-nanotube-composites-as-a-tunable-low-cost-chemical-vapour-sensing-platform
#13
Z C Kennedy, J F Christ, K A Evans, B W Arey, L E Sweet, M G Warner, R L Erikson, C A Barrett
We report the production of flexible, highly-conductive poly(vinylidene fluoride) (PVDF) and multi-walled carbon nanotube (MWCNT) composites as filament feedstock for 3D printing. This account further describes, for the first time, fused deposition modelling (FDM) derived 3D-printed objects with chemiresistive properties in response to volatile organic compounds. The typically prohibitive thermal expansion and die swell characteristics of PVDF were minimized by the presence of MWCNTs in the composites enabling straightforward processing and printing...
April 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28421875/three-dimensional-printing-and-its-applications-in-otorhinolaryngology-head-and-neck-surgery
#14
Trevor D Crafts, Susan E Ellsperman, Todd J Wannemuehler, Travis D Bellicchi, Taha Z Shipchandler, Avinash V Mantravadi
Objective Three-dimensional (3D)-printing technology is being employed in a variety of medical and surgical specialties to improve patient care and advance resident physician training. As the costs of implementing 3D printing have declined, the use of this technology has expanded, especially within surgical specialties. This article explores the types of 3D printing available, highlights the benefits and drawbacks of each methodology, provides examples of how 3D printing has been applied within the field of otolaryngology-head and neck surgery, discusses future innovations, and explores the financial impact of these advances...
November 1, 2016: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28420248/creating-an-optimal-3d-printed-model-for-temporal-bone-dissection-training
#15
Kuniyuki Takahashi, Yuka Morita, Shinsuke Ohshima, Shuji Izumi, Yamato Kubota, Yutaka Yamamoto, Sugata Takahashi, Arata Horii
OBJECTIVE: Making a 3-dimensional (3D) temporal bone model is simple using a plaster powder bed and an inkjet printer. However, it is difficult to reproduce air-containing spaces and precise middle ear structures. The objective of this study was to overcome these problems and create a temporal bone model that would be useful both as a training tool and for preoperative simulation. METHODS: Drainage holes were made to remove excess materials from air-containing spaces, ossicle ligaments were manually changed to bony structures, and small and/or soft tissue structures were colored differently while designing the 3D models...
April 1, 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28420217/microfluidic-ebg-sensor-based-on-phase-shift-method-realized-using-3d-printing-technology
#16
Vasa Radonić, Slobodan Birgermajer, Goran Kitić
In this article, we propose a novel microfluidic microstrip electromagnetic band gap (EBG) sensor realized using cost-effective 3D printing technology. Microstrip sensor allows monitoring of the fluid properties flowing in the microchannel embedded between the microstrip line and ground plane. The sensor's operating principle is based on the phase-shift method, which allows the characterization at a single operating frequency of 6 GHz. The defected electromagnetic band gap (EBG) structure is realized as a pattern in the microstrip ground plane to improve sensor sensitivity...
April 18, 2017: Sensors
https://www.readbyqxmd.com/read/28417536/stretchable-and-soft-electronics-using-liquid-metals
#17
REVIEW
Michael D Dickey
The use of liquid metals based on gallium for soft and stretchable electronics is discussed. This emerging class of electronics is motivated, in part, by the new opportunities that arise from devices that have mechanical properties similar to those encountered in the human experience, such as skin, tissue, textiles, and clothing. These types of electronics (e.g., wearable or implantable electronics, sensors for soft robotics, e-skin) must operate during deformation. Liquid metals are compelling materials for these applications because, in principle, they are infinitely deformable while retaining metallic conductivity...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28412790/-a-preliminary-study-of-three-dimensional-bio-printing-by-polycaprolactone-and-periodontal-ligament-stem-cells
#18
J Xu, M Hu
Objective: To investigate the technical scheme of three-dimensional (3D) bio-printing by polycaprolactone (PCL) and periodontal ligament stem cells (PDLSC). Methods: To manufacture a 3D bio-printing body, PDLSC were used as seed cells, and polycaprolactone (PCL) was used as the 3D printing scaffold material. Print size was designed at 13.0 mm×13.0 mm, and mesh size was 0.25 mm×0.25 mm (group A) and 0.75 mm×0.75 mm (group B). Cell counting kit-8 was used to detect the proliferation of PDLSC on day 1, day 3 and day 5 respectively...
April 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28409207/the-precise-repositioning-instrument-for-genioplasty-and-a-three-dimensional-printing-technique-for-treatment-of-complex-facial-asymmetry
#19
Lin Wang, Dan Tian, Xiumei Sun, Yanju Xiao, Li Chen, Guomin Wu
BACKGROUND: Facial asymmetry is very common in maxillofacial deformities. It is difficult to achieve accurate reconstruction. With the help of 3D printing models and surgical templates, the osteotomy line and the amount of bone grinding can be accurate. Also, by means of the precise repositioning instrument, the repositioning of genioplasty can be accurate and quick. In this study, we present a three-dimensional printing technique and the precise repositioning instrument to guide the osteotomy and repositioning, and illustrate their feasibility and validity...
April 13, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28406937/cost-and-time-effective-method-for-multi-scale-measures-of-rugosity-fractal-dimension-and-vector-dispersion-from-coral-reef-3d-models
#20
G C Young, S Dey, A D Rogers, D Exton
We present a method to construct and analyse 3D models of underwater scenes using a single cost-effective camera on a standard laptop with (a) free or low-cost software, (b) no computer programming ability, and (c) minimal man hours for both filming and analysis. This study focuses on four key structural complexity metrics: point-to-point distances, linear rugosity (R), fractal dimension (D), and vector dispersion (1/k). We present the first assessment of accuracy and precision of structure-from-motion (SfM) 3D models from an uncalibrated GoPro™ camera at a small scale (4 m2) and show that they can provide meaningful, ecologically relevant results...
2017: PloS One
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