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https://www.readbyqxmd.com/read/28338309/impact-of-personalized-three-dimensional-3d-printed-pelvicalyceal-system-models-on-patient-information-in-percutaneous-nephrolithotripsy-surgery-a-pilot-study
#1
Hasan Anil Atalay, H Lütfi Canat, Volkan Ülker, İlter Alkan, Ünsal Özkuvanci, Fatih Altunrende
OBJECTIVE: To investigate the impact of personalized three dimensional (3D) printed pelvicalyceal system models on patient information before percutaneous nephrolithotripsy surgery. MATERIAL AND METHODS: Patients with unilateral complex renal stones with indicatation of percutaneous nephrolithotripsy surgery were selected. Usable data of patients were obtained from CT scans as Digital Imaging and Communications in Medicine (DICOM) format. Mimics software version 16...
March 24, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28319372/3d-printed-micrometre-scale-polymer-mounts-for-single-crystal-analysis
#2
Niall P Macdonald, Grace L Bunton, Ah Young Park, Michael C Breadmore, Nathan Laird Kilah
3D printed micrometre-scale polymer mounts for single crystal analysis have been prepared by photo polymerization using digital light projection stereolithography (DLP-SLA), with a commercially available digital light projection stereolithography printer (US$4000) and 3DM-ABS resin (US$150 per litre). The polymer mounts were prepared in batches of 49 in 1 hour 15 minutes, which allowed for rapid prototyping and testing of new crystal mounting designs, with a resin cost of 0.2¢ US per mount. The suitability of the 3D printed mounts for single crystal crystallography has been demonstrated through their use in Cu Kα X-ray diffraction experiments of Rochelle salt (sodium potassium tartrate), the protein lysozyme, and has been employed for routine crystallographic analysis of organic and inorganic materials...
March 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28318544/stereolithography-a-new-method-for-processing-dental-ceramics-by-additive-computer-aided-manufacturing
#3
Marion Dehurtevent, Lieven Robberecht, Jean-Christophe Hornez, Anthony Thuault, Etienne Deveaux, Pascal Béhin
OBJECTIVES: The aim of this study was to compare the physical and mechanical properties of stereolithography (SLA)- manufactured alumina ceramics of different composition to those of subtractive- manufactured ceramics and to produce suitable dental crown frameworks. METHODS: The physical and mechanical properties of a control and six experimental SLA ceramics prepared from slurries with small (S) and large (L) particles (0.46±0.03 and 1.56±0.04μm, respectively) and three dry matter contents (70%, 75%, 80%) were evaluated by dynamic rheometry, hydrostatic weighing, three3-point flexural strength measurements, and Weibull analyses, and by the micrometrics measurement of shrinkage ratio before and after the heat treatments...
March 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28298037/impact-of-bifurcation-angle-and-inflow-coefficient-on-the-rupture-risk-of-bifurcation-type-basilar-artery-tip-aneurysms
#4
Sherif Rashad, Shin-Ichiro Sugiyama, Kuniyasu Niizuma, Kenichi Sato, Hidenori Endo, Shunsuke Omodaka, Yasushi Matsumoto, Miki Fujimura, Teiji Tominaga
OBJECTIVE Risk factors for aneurysm rupture have been extensively studied, with several factors showing significant correlations with rupture status. Several studies have shown that aneurysm shape and hemodynamics change after rupture. In the present study the authors investigated a static factor, the bifurcation angle, which does not change after rupture, to understand its effect on aneurysm rupture risk and hemodynamics. METHODS A hospital database was retrospectively reviewed to identify patients with cerebral aneurysms treated surgically or endovascularly in the period between 2008 and 2015...
March 3, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28286037/surface-enrichment-with-hydroxyapatite-nanoparticles-in-stereolithography-fabricated-composite-polymer-scaffolds-promotes-bone-repair
#5
O Guillaume, M A Geven, C M Sprecher, V A Stadelmann, D W Grijpma, T T Tang, L Qin, Y Lai, M Alini, J D de Bruijn, H Yuan, R G Richards, D Eglin
Fabrication of composite scaffolds using stereolithography (SLA) for bone tissue engineering has shown great promises. However, in order to trigger effective bone formation and implant integration, exogenous growth factors are commonly combined to scaffold materials. In this study, we fabricated biodegradable composite scaffolds using SLA and endowed them with osteopromotive properties in the absence of biologics. First we prepared photo-crosslinkable poly(trimethylene carbonate) (PTMC) resins containing 20 and 40 wt...
March 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28281349/comparing-microfluidic-performance-of-three-dimensional-3d-printing-platforms
#6
Niall P Macdonald, Joan M Cabot, Petr Smejkal, Rosanne M Guijt, Brett Paull, Michael C Breadmore
Three-dimensional (3D) printing has emerged as a potential revolutionary technology for the fabrication of microfluidic devices. A direct experimental comparison of the three 3D printing technologies dominating microfluidics was conducted using a Y-junction microfluidic device, the design of which was optimized for each printer: fused deposition molding (FDM), Polyjet, and digital light processing stereolithography (DLP-SLA). Printer performance was evaluated in terms of feature size, accuracy, and suitability for mass manufacturing; laminar flow was studied to assess their suitability for microfluidics...
March 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28274121/dynamics-of-capillary-driven-flow-in-3d-printed-open-microchannels
#7
Robert K Lade, Erik J Hippchen, Christopher W Macosko, Lorraine F Francis
Microchannels have applications in microfluidic devices, patterns for micromolding, and even flexible electronic devices. Three-dimensional (3D) printing presents a promising alternative manufacturing route for these microchannels due to the technology's relative speed and the design freedom it affords its users. However, the roughness of 3D printed surfaces can significantly influence flow dynamics inside of a microchannel. In this work, open microchannels are fabricated using four different 3D printing techniques: fused deposition modeling (FDM), stereolithography (SLA), selective laser sintering, and multi jet modeling...
March 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28269205/gelatin-methacrylamide-hydrogel-with-graphene-nanoplatelets-for-neural-cell-laden-3d-bioprinting
#8
Wei Zhu, Brent T Harris, Lijie Grace Zhang
Nervous system is extremely complex which leads to rare regrowth of nerves once injury or disease occurs. Advanced 3D bioprinting strategy, which could simultaneously deposit biocompatible materials, cells and supporting components in a layer-by-layer manner, may be a promising solution to address neural damages. Here we presented a printable nano-bioink composed of gelatin methacrylamide (GelMA), neural stem cells, and bioactive graphene nanoplatelets to target nerve tissue regeneration in the assist of stereolithography based 3D bioprinting technique...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28264062/interactive-reconstructions-of-cranial-3d-implants-under-mevislab-as-an-alternative-to-commercial-planning-software
#9
Jan Egger, Markus Gall, Alois Tax, Muammer Ücal, Ulrike Zefferer, Xing Li, Gord von Campe, Ute Schäfer, Dieter Schmalstieg, Xiaojun Chen
In this publication, the interactive planning and reconstruction of cranial 3D Implants under the medical prototyping platform MeVisLab as alternative to commercial planning software is introduced. In doing so, a MeVisLab prototype consisting of a customized data-flow network and an own C++ module was set up. As a result, the Computer-Aided Design (CAD) software prototype guides a user through the whole workflow to generate an implant. Therefore, the workflow begins with loading and mirroring the patients head for an initial curvature of the implant...
2017: PloS One
https://www.readbyqxmd.com/read/28251054/surface-curvature-differentially-regulates-stem-cell-migration-and-differentiation-via-altered-attachment-morphology-and-nuclear-deformation
#10
Maike Werner, Sébastien B G Blanquer, Suvi P Haimi, Gabriela Korus, John W C Dunlop, Georg N Duda, Dirk W Grijpma, Ansgar Petersen
Signals from the microenvironment around a cell are known to influence cell behavior. Material properties, such as biochemical composition and substrate stiffness, are today accepted as significant regulators of stem cell fate. The knowledge of how cell behavior is influenced by 3D geometric cues is, however, strongly limited despite its potential relevance for the understanding of tissue regenerative processes and the design of biomaterials. Here, the role of surface curvature on the migratory and differentiation behavior of human mesenchymal stem cells (hMSCs) has been investigated on 3D surfaces with well-defined geometric features produced by stereolithography...
February 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28245958/use-of-maxillofacial-laboratory-materials-to-construct-a-tissue-equivalent-head-phantom-with-removable-titanium-implantable-devices-for-use-in-verification-of-the-dose-of-intensity-modulated-radiotherapy
#11
K Morris
The dose of radiotherapy is often verified by measuring the dose of radiation at specific points within a phantom. The presence of high-density implant materials such as titanium, however, may cause complications both during calculation and delivery of the dose. Numerous studies have reported photon/electron backscatter and alteration of the dose by high-density implants, but we know of no evidence of a dosimetry phantom that incorporates high density implants or fixtures. The aim of the study was to design and manufacture a tissue-equivalent head phantom for use in verification of the dose in radiotherapy using a combination of traditional laboratory materials and techniques and 3-dimensional technology that can incorporate titanium maxillofacial devices...
February 25, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28243363/a-novel-patient-specific-drill-guide-template-for-pedicle-screw-insertion-into-the-subaxial-cervical-spine-utilizing-stereolithographic-modelling-an-in-vitro-study
#12
Rafael Cruz Bundoc, Giorgio De Guzman Delgado, Samuel Arsenio Munoz Grozman
STUDY DESIGN: Cadaveric study. PURPOSE: The purpose of this study was to assess the accuracy and feasibility of cervical pedicle screw (CPS) insertion into the subaxial cervical spine placed using a patient-specific drill guide template constructed from a stereolithographic model. OVERVIEW OF LITERATURE: CPS fixation is an invaluable tool for posterior cervical fixation because of its biomechanical advantages. The major drawback is its narrow corridor that allows very little clearance for neural and vascular injuries...
February 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28242061/patient-specific-in-vitro-models-for-hemodynamic-analysis-of-congenital-heart-disease-additive-manufacturing-approach
#13
Rafael Medero, Sylvana García-Rodríguez, Christopher J François, Alejandro Roldán-Alzate
Non-invasive hemodynamic assessment of total cavopulmonary connection (TCPC) is challenging due to the complex anatomy. Additive manufacturing (AM) is a suitable alternative for creating patient-specific in vitro models for flow measurements using four-dimensional (4D) Flow MRI. These in vitro systems have the potential to serve as validation for computational fluid dynamics (CFD), simulating different physiological conditions. This study investigated three different AM technologies, stereolithography (SLA), selective laser sintering (SLS) and fused deposition modeling (FDM), to determine differences in hemodynamics when measuring flow using 4D Flow MRI...
February 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28230346/high-strength-stereolithographic-3d-printed-nanocomposites-graphene-oxide-metastability
#14
Jill Z Manapat, Joey Dacula Mangadlao, Brylee David Buada Tiu, Grace C Tritchler, Rigoberto C Advincula
The weak thermomechanical properties of commercial 3D printing plastics have limited the technology's application mainly to rapid prototyping. In this report, we demonstrate a simple approach that takes advantage of the metastable, temperature-dependent structure of graphene oxide (GO) to enhance the mechanical properties of conventional 3D-printed resins produced by stereolithography (SLA). A commercially available SLA resin was reinforced with minimal amounts of GO nanofillers and thermally annealed at 50 and 100 °C for 12 h...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28228852/3d-printed-fluidics-with-embedded-analytic-functionality-for-automated-reaction-optimisation
#15
Andrew J Capel, Andrew Wright, Matthew J Harding, George W Weaver, Yuqi Li, Russell A Harris, Steve Edmondson, Ruth D Goodridge, Steven D R Christie
Additive manufacturing or '3D printing' is being developed as a novel manufacturing process for the production of bespoke micro- and milliscale fluidic devices. When coupled with online monitoring and optimisation software, this offers an advanced, customised method for performing automated chemical synthesis. This paper reports the use of two additive manufacturing processes, stereolithography and selective laser melting, to create multifunctional fluidic devices with embedded reaction monitoring capability...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28227435/gelatin-methacrylamide-hydrogel-with-graphene-nanoplatelets-for-neural-cell-laden-3d-bioprinting
#16
Wei Zhu, Brent T Harris, Lijie Grace Zhang, Wei Zhu, Brent T Harris, Lijie Grace Zhang, Wei Zhu, Brent T Harris, Lijie Grace Zhang
Nervous system is extremely complex which leads to rare regrowth of nerves once injury or disease occurs. Advanced 3D bioprinting strategy, which could simultaneously deposit biocompatible materials, cells and supporting components in a layer-by-layer manner, may be a promising solution to address neural damages. Here we presented a printable nano-bioink composed of gelatin methacrylamide (GelMA), neural stem cells, and bioactive graphene nanoplatelets to target nerve tissue regeneration in the assist of stereolithography based 3D bioprinting technique...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222873/influence-of-abutment-tooth-geometry-on-the-accuracy-of%C3%A2-conventional-and-digital-methods-of-obtaining-dental%C3%A2-impressions
#17
Jeison B Carbajal Mejía, Kazumichi Wakabayashi, Takashi Nakamura, Hirofumi Yatani
STATEMENT OF PROBLEM: Direct (intraoral) and indirect (desktop) digital scanning can record abutment tooth preparations despite their geometry. However, little peer-reviewed information is available regarding the influence of abutment tooth geometry on the accuracy of digital methods of obtaining dental impressions. PURPOSE: The purpose of this in vitro study was to evaluate the influence of abutment tooth geometry on the accuracy of conventional and digital methods of obtaining dental impressions in terms of trueness and precision...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28186188/all-in-one-3d-printed-microscopy-chamber-for-multidimensional-imaging-the-universlide
#18
Kevin Alessandri, Laetitia Andrique, Maxime Feyeux, Andreas Bikfalvi, Pierre Nassoy, Gaëlle Recher
While live 3D high resolution microscopy techniques are developing rapidly, their use for biological applications is partially hampered by practical difficulties such as the lack of a versatile sample chamber. Here, we propose the design of a multi-usage observation chamber adapted for live 3D bio-imaging. We show the usefulness and practicality of this chamber, which we named the UniverSlide, for live imaging of two case examples, namely multicellular systems encapsulated in sub-millimeter hydrogel shells and zebrafish larvae...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28168520/creating-vascular-models-by-postprocessing-computed-tomography-angiography-images-a-guide-for-anatomical-education
#19
Figen Govsa, Mehmet Asim Ozer, Suzan Sirinturk, Cenk Eraslan, Ahmet Kemal Alagoz
BACKGROUND: A new application of teaching anatomy includes the use of computed tomography angiography (CTA) images to create clinically relevant three-dimensional (3D) printed models. The purpose of this article is to review recent innovations on the process and the application of 3D printed models as a tool for using under and post-graduate medical education. METHODS: Images of aortic arch pattern received by CTA were converted into 3D images using the Google SketchUp free software and were saved in stereolithography format...
February 6, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28150829/one-step-micromolding-of-complex-3d-microchambers-for-single-cell-analysis
#20
Hiroaki Suzuki, Kenta Mitsuno, Katsuyuki Shiroguchi, Mamiko Tsugane, Taiji Okano, Tetsuji Dohi, Tomoaki Tsuji
Herein we examined the extent of replicability of the PDMS microchamber device transferred from the master mold with complex 3D structures fabricated via micro stereolithography. Due to the elastomeric properties of PDMS, the reversely tapered micromold, with the diameter ratio of ∼5 from the largest to the narrowest part, was precisely transferred without breaking. We obtained the mathematical model to estimate the stress exerted on the mold during the demolding process. Finally, we tested the applicability of this unusual microchamber for single-cell trapping and an enzyme assay...
February 2, 2017: Lab on a Chip
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