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3 dimension print

Shruti Digholkar, V N V Madhav, Jayant Palaskar
PURPOSE: The purpose of this study was to evaluate and compare the flexural strength and microhardness of provisional restorative materials fabricated utilizing rapid prototyping (RP), Computer Assisted Designing and Computer Assisted Milling (CAD-CAM) and conventional method. MATERIALS AND METHODS: Twenty specimens of dimensions 25 mm × 2 mm × 2 mm (ADA-ANSI specification #27) were fabricated each using: (1) Three dimensional (3D) printed light-cured micro-hybrid filled composite by RP resin group, (2) a milled polymethyl methacrylate (CH) using CAD-CAM (CC resin group), and (3) a conventionally fabricated heat activated polymerized CH resin group...
October 2016: Journal of Indian Prosthodontic Society
Shawkat Ali, Arshad Hassan, Jinho Bae, Chong Hyun Lee, Juho Kim
Since printed resistance temperature detectors (RTDs) is affected by tension and compression of metallic pattern on flexible or curved surfaces, a significant temperature sensing error is occurred in general. Hence, we propose differential temperature sensor (DTS) to compensate the bending effect of the printed RTDs, which is composed of two serially connected similar meander patterns fabricated back-to-back on the polyimide polyethyleneterephthalate (PET) substrate through inkjet printer Dimatix DMP-3000 by using silver nanoparticles...
October 8, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Miao Meng, Mehdi Kiani
Ultrasound has been recently proposed as an alternative modality for efficient wireless power transmission (WPT) to biomedical implants with millimeter (mm) dimensions. This paper presents the theory and design methodology of ultrasonic WPT links that involve mm-sized receivers (Rx). For given load (RL) and powering distance (d), the optimal geometries of transmitter (Tx) and Rx ultrasonic transducers, including their diameter and thickness, as well as the optimal operation frequency (fc) are found through a recursive design procedure to maximize the power transmission efficiency (PTE)...
September 20, 2016: IEEE Transactions on Biomedical Circuits and Systems
Jun Yeon Won, Guen Bae Ko, Jae Sung Lee
In this paper, we propose a fully time-based multiplexing and readout method that uses the principle of the global positioning system. Time-based multiplexing allows simplifying the multiplexing circuits where the only innate traces that connect the signal pins of the silicon photomultiplier (SiPM) channels to the readout channels are used as the multiplexing circuit. Every SiPM channel is connected to the delay grid that consists of the traces on a printed circuit board, and the inherent transit times from each SiPM channel to the readout channels encode the position information uniquely...
October 7, 2016: Physics in Medicine and Biology
Fazel Zare Bidoky, C Daniel Frisbie
Printed, low-voltage poly(3-hexylthiophene) (P3HT) electrolyte-gated transistors (EGTs) have favorable quasi-static characteristics, including sub 2 V operation, carrier mobility (μ) of 1 cm(2)/(V s), ON/OFF current ratio of 10(6), and static leakage current density of 10(-6) A/cm(2). Here we study the dynamic performance of P3HT EGTs in which the semiconductor, dielectric, and gate electrode were deposited using aerosol-jet printing; the source and drain electrodes were patterned by conventional microlithography...
October 12, 2016: ACS Applied Materials & Interfaces
Markus Troeltzsch, Matthias Troeltzsch, Philipp Kauffmann, Rudolph Gruber, Phillipp Brockmeyer, Norman Moser, Anna Rau, Henning Schliephake
PURPOSE: To evaluate the efficacy of grafting materials in lateral and vertical ridge augmentations. MATERIALS AND METHODS: A systematic review of the literature on the clinical use of grafting materials of the years 1995 to April 2015 was conducted using electronic search of PubMed and Cochrane libraries and hand search of eight print journals. A total of 184 papers were included, comprising 6182 patients. Parameters evaluated were observation period [months], bone formation [histologic area%], defect fill [%], horizontal and vertical gain [mm], loss of augmented volume [mm], complication rate [%], and implant survival rate [%]...
August 18, 2016: Journal of Cranio-maxillo-facial Surgery
Patrina S P Poh, Mohit P Chhaya, Felix M Wunner, Elena M De-Juan-Pardo, Arndt F Schilling, Jan-Thorsten Schantz, Martijn van Griensven, Dietmar W Hutmacher
New advanced manufacturing technologies under the alias of additive biomanufacturing allow the design and fabrication of a range of products from pre-operative models, cutting guides and medical devices to scaffolds. The process of printing in 3 dimensions of cells, extracellular matrix (ECM) and biomaterials (bioinks, powders, etc.) to generate in vitro and/or in vivo tissue analogue structures has been termed bioprinting. To further advance in additive biomanufacturing, there are many aspects that we can learn from the wider additive manufacturing (AM) industry, which have progressed tremendously since its introduction into the manufacturing sector...
August 1, 2016: Advanced Drug Delivery Reviews
Giovanni Anthony, Ju-Ahng Lee
Recent development in 3D printing technology has opened an exciting possibility for manufacturing 3D devices on one's desktop. We used 3D modeling programs to design 3D models of a tissue-handling system and these models were "printed" in a stereolithography (SLA) 3D printer to create precision histology devices that are particularly useful to handle multiple samples with small dimensions in parallel. Our system has been successfully tested for in situ hybridization of zebrafish embryos. Some of the notable features include: (1) A conveniently transferrable chamber with 6 mesh-bottomed wells, each of which can hold dozens of zebrafish embryos...
2016: PloS One
Xiaoming Liu, Carlos Carbonell, Adam B Braunschweig
Biointerfaces direct some of the most complex biological events, including cell differentiation, hierarchical organization, and disease progression, or are responsible for the remarkable optical, electronic, and biological behavior of natural materials. Chemical information encoded within the 4D nanostructure of biointerfaces - comprised of the three Cartesian coordinates (x, y, z), and chemical composition of each molecule within a given volume - dominates their interfacial properties. As such, there is a strong interest in creating printing platforms that can emulate the 4D nanostructure - including both the chemical composition and architectural complexity - of biointerfaces...
July 27, 2016: Chemical Society Reviews
Sarah K Anciaux, Matthew Geiger, Michael T Bowser
The cost, time, and restrictions on creative flexibility associated with current fabrication methods present significant challenges in the development and application of microfluidic devices. Additive manufacturing, also referred to as three-dimensional (3D) printing, provides many advantages over existing methods. With 3D printing, devices can be made in a cost-effective manner with the ability to rapidly prototype new designs. We have fabricated a micro free-flow electrophoresis (μFFE) device using a low-cost, consumer-grade 3D printer...
August 2, 2016: Analytical Chemistry
Lorenzo Costigliola, Thomas B Schrøder, Jeppe C Dyre
The recent theoretical prediction by Maimbourg and Kurchan [e-print arXiv:1603.05023 (2016)] that for regular pair-potential systems the virial potential-energy correlation coefficient increases towards unity as the dimension d goes to infinity is investigated for the standard 12-6 Lennard-Jones fluid. This is done by computer simulations for d = 2, 3, 4 going from the critical point along the critical isotherm/isochore to higher density/temperature. In both cases the virial potential-energy correlation coefficient increases significantly...
June 21, 2016: Journal of Chemical Physics
Xinning Yu, Jinghua Fang, Jianyang Luo, Xianyan Yang, Dongshuang He, Zhongru Gou, Xuesong Dai
OBJECTIVE: To fabricate organic-inorganic composite tissue engineering scaffolds for reconstructing calcified cartilage layer based on three-dimensional (3D) printing technique. METHODS: The scaffolds were developed by 3D-printing technique with highly bioactive calcium-magnesium silicate ultrafine particles of 1%, 3% and 5% of mass fraction, in which the organic phases were composed of type I collagen and sodium hyaluronate. The 3D-printed scaffolds were then crosslinked and solidified by alginate and CaCl₂ aerosol...
March 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
Jiao Wei, Tanja Herrler, Chuanchang Dai, Kai Liu, Dong Han, Qingfeng Li
Reconstruction of large mandibular defects is complex and challenging. The authors aimed to individually self-generate a large vascularized bone construct for autologous transplantation without the use of exogenous additives based on the concept of guided self-generation. Using computer-aided design and manufacturing a large size goat mandibular bone was reconstructed in 3 dimensions. Its negative mold printed from hydroxylapatite was temporarily embedded into the costal periosteum along with a contralateral demineralized bone matrix scaffold as control...
June 2016: Journal of Craniofacial Surgery
Mohamed Abdelnabi Imam, Ashraf Abdelkafy
BACKGROUND: The transosseous-equivalent cross bridge double row (TESBDR) rotator cuff (RC) repair technique has been developed to optimize healing biology at a repaired RC tendon insertion. It has been shown in the laboratory to improve pressurized contact area and mean foot print pressure when compared with a double row anchor technique. Pressure has been shown to influence healing between tendon and bone, and the tendon compression vector provided by the transosseous-equivalent suture bridges may enhance healing...
2016: SICOT-J
Erin A Gillaspie, Jane S Matsumoto, Natalie E Morris, Robert J Downey, K Robert Shen, Mark S Allen, Shanda H Blackmon
PURPOSE: Three-dimensional (3D) printing of anatomic models for complex surgical cases improves patient and resident education, operative team planning, and guides the operation. Our group describes two additional dimensions. DESCRIPTION: The process of 5-dimensional (5D) printing was developed for surgical planning. Pretreatment computed tomography and positron emission tomography scans were reformatted and fused. Selected anatomy from these studies, along with posttreatment computed tomography and magnetic resonance images, were coregistered and segmented...
May 2016: Annals of Thoracic Surgery
Guillaume Debellemanière, Mathieu Flores, Michel Montard, Bernard Delbosc, Maher Saleh
PURPOSE: To determine whether the historical Ridley lens could be reproduced with current three-dimensional lens printing technology. METHODS: A reproduction of the Ridley lens was printed using the Printoptical Technology (LUXeXceL Group BV, Kruiningen, Netherlands). Photographs and electron microscopy images were taken. Dimensions, weight, anterior and posterior surface radius of curvature, optical transmission, back optical power, and surface analysis using interferometry were obtained...
March 2016: Journal of Refractive Surgery
Lei Cui, Anthony Phan, Garry Allison
Robotic rehabilitation has proven to be cost-effective in accelerating the rehabilitation process by eliminating the constant need for supervision by a therapist. This work aimed to design and develop a novel three-dimensional (3D) printable non-assembly five-fingered robotic hand exoskeleton for rehabilitation. A single degree-of-freedom (DOF) linkage was designed to actuate each finger with 3 output links that correspond to the three phalanxes of the human finger. We used a parametric modelling approach that suits the dimensions of individual's hand...
August 2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Beth Ripley, Tatiana Kelil, Michael K Cheezum, Alexandra Goncalves, Marcelo F Di Carli, Frank J Rybicki, Mike Steigner, Dimitrios Mitsouras, Ron Blankstein
BACKGROUND: 3D printing is a promising technique that may have applications in medicine, and there is expanding interest in the use of patient-specific 3D models to guide surgical interventions. OBJECTIVE: To determine the feasibility of using cardiac CT to print individual models of the aortic root complex for transcatheter aortic valve replacement (TAVR) planning as well as to determine the ability to predict paravalvular aortic regurgitation (PAR). METHODS: This retrospective study included 16 patients (9 with PAR identified on blinded interpretation of post-procedure trans-thoracic echocardiography and 7 age, sex, and valve size-matched controls with no PAR)...
January 2016: Journal of Cardiovascular Computed Tomography
Atabak Ghanizadeh Tabriz, Miguel A Hermida, Nicholas R Leslie, Wenmiao Shu
Different bioprinting techniques have been used to produce cell-laden alginate hydrogel structures, however these approaches have been limited to 2D or simple three-dimension (3D) structures. In this study, a new extrusion based bioprinting technique was developed to produce more complex alginate hydrogel structures. This was achieved by dividing the alginate hydrogel cross-linking process into three stages: primary calcium ion cross-linking for printability of the gel, secondary calcium cross-linking for rigidity of the alginate hydrogel immediately after printing and tertiary barium ion cross-linking for long-term stability of the alginate hydrogel in culture medium...
2015: Biofabrication
M A R Krielaart, C H Vermeer, S Vanapalli
Heat switches are devices that can change from a thermally conducting (on-) state to an insulating (off-) state whenever the need arises. They enable adaptive thermal management strategies in which cooling rates are altered either spatially or temporally, leading to a substantial reduction in the energy and mass budget of a large range of systems. State-of-the-art heat switches are only rarely employed in thermal system architectures, since they are rather bulky and have a limited thermal performance (expressed as the heat transfer ratio between the on- and off-state heat conductance)...
November 2015: Review of Scientific Instruments
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