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stereolithography

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https://www.readbyqxmd.com/read/28186188/all-in-one-3d-printed-microscopy-chamber-for-multidimensional-imaging-the-universlide
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28134482/modelling-of-aortic-aneurysm-and-aortic-dissection-through-3d-printing
#4
Daniel Ho, Andrew Squelch, Zhonghua Sun
INTRODUCTION: The aim of this study was to assess if the complex anatomy of aortic aneurysm and aortic dissection can be accurately reproduced from a contrast-enhanced computed tomography (CT) scan into a three-dimensional (3D) printed model. METHODS: Contrast-enhanced cardiac CT scans from two patients were post-processed and produced as 3D printed thoracic aorta models of aortic aneurysm and aortic dissection. The transverse diameter was measured at five anatomical landmarks for both models, compared across three stages: the original contrast-enhanced CT images, the stereolithography (STL) format computerised model prepared for 3D printing and the contrast-enhanced CT of the 3D printed model...
January 30, 2017: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/28113194/development-of-novel-3-d-printed-scaffolds-with-core-shell-nanoparticles-for-nerve-regeneration
#5
Se-Jun Lee, Wei Zhu, Lanier Heyburn, Margaret Nowicki, Brent Harris, Lijie Grace Zhang
A traumatic injury of peripheral nerves is serious clinical problem that may lead to major loss of nerve function, affecting quality of patient's life. Currently, nerve autograft is widely used to reconstruct the nerve gap. However, such surgical procedure suffers from many disadvantages including donor site morbidity and limited availability. In order to address these issues, neural tissue engineering has focused on the development of synthetic nerve scaffolds to support bridging a larger gap and improving nerve generation...
February 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28107560/randomized-controlled-clinical-study-comparing-a-volume-stable-collagen-matrix-to-autogenous-connective-tissue-grafts-for-soft-tissue-augmentation-at-implant-sites-linear-volumetric-soft-tissue-changes-up-to-3-months
#6
Marco Zeltner, Ronald E Jung, Christoph H F Hämmerle, Jürg Hüsler, Daniel S Thoma
AIM: to test whether or not the use of a volume stable collagen matrix (VCMX) results in soft tissue volume increase at implant sites non-inferior to an autogenous subepithelial connective tissue graft (SCTG). METHODS: In 20 patients soft tissue augmentation at implant sites was performed using VCMX or SCTG. Casts obtained prior to augmentation (BL), at 30 (FU-30) and 90 days (FU-90) were digitized and transferred to stereolithography (STL) files. BL, FU-30 and FU-90 STL files were superimposed and linear volumetric changes evaluated in crestal and buccal regions of interest (ROI)...
January 20, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28102349/development-of-patient-specific-phantoms-for-verification-of-stereotactic-body-radiation-therapy-planning-in-patients-with-metallic-screw-fixation
#7
Dongryul Oh, Chae-Seon Hong, Sang Gyu Ju, Minkyu Kim, Bum Yong Koo, SungBack Choi, Hee Chul Park, Doo Ho Choi, Hongryull Pyo
A new technique for manufacturing a patient-specific dosimetric phantom using three-dimensional printing (PSDP_3DP) was developed, and its geometrical and dosimetric accuracy was analyzed. External body contours and structures of the spine and metallic fixation screws (MFS) were delineated from CT images of a patient with MFS who underwent stereotactic body radiation therapy for spine metastasis. Contours were converted into a STereoLithography file format using in-house program. A hollow, four-section PSDP was designed and manufactured using three types of 3DP to allow filling with a muscle-equivalent liquid and insertion of dosimeters...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28089336/a-comparative-study-of-additive-and-subtractive-manufacturing-for-dental-restorations
#8
Eun-Jeong Bae, Il-Do Jeong, Woong-Chul Kim, Ji-Hwan Kim
STATEMENT OF PROBLEM: Digital systems have recently found widespread application in the fabrication of dental restorations. For the clinical assessment of dental restorations fabricated digitally, it is necessary to evaluate their accuracy. However, studies of the accuracy of inlay restorations fabricated with additive manufacturing are lacking. PURPOSE: The purpose of this in vitro study was to evaluate and compare the accuracy of inlay restorations fabricated by using recently introduced additive manufacturing with the accuracy of subtractive methods...
January 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28078781/a-novel-conversion-method-for-radiographic-guide-into-surgical-guide
#9
Yao-Te Peng, Chung-Chih Tseng, Yi-Chun Du, Yen-Nien Chen, Chih-Han Chang
BACKGROUND: The study proposed a novel method for converting a radiographic guide into a surgical guide and evaluated its accuracy. MATERIALS AND METHODS: Radiographic guide was reformed with the addition of index rods for geometric conversion method (GCM). Planning implants were projected on geometric projection planes, and the implant positions were measured. The radiographic guide was converted into surgical guide using a generic bench drill machine with GCM data...
January 11, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28058697/macro-scale-model-study-of-a-tunable-drug-dispensation-mechanism-for-controlled-drug-delivery-in-potential-wound-healing-applications
#10
Mariam Mir, Umar Ansari, Murtaza Najabat Ali
BACKGROUND: Auxetic materials tend to exhibit stretching in the direction of the applied load as well as in the perpendicular direction. This may be an inherent property of the material, or it might be a particular structural characteristic that confers it with auxetic properties. In this study, the auxetic properties of a rotating squares auxetic design were utilized in tandem with a stretching mechanism to manufacture a device that offers the advantages of adjustable pore size and hence tunable drug delivery characteristics...
October 10, 2016: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28052421/additive-manufacturing-of-metal-structures-at-the-micrometer-scale
#11
Luca Hirt, Alain Reiser, Ralph Spolenak, Tomaso Zambelli
Currently, the focus of additive manufacturing (AM) is shifting from simple prototyping to actual production. One driving factor of this process is the ability of AM to build geometries that are not accessible by subtractive fabrication techniques. While these techniques often call for a geometry that is easiest to manufacture, AM enables the geometry required for best performance to be built by freeing the design process from restrictions imposed by traditional machining. At the micrometer scale, the design limitations of standard fabrication techniques are even more severe...
January 4, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28048625/tu-h-206-02-novel-linearly-filled-derenzo-pet-phantom-design
#12
S Graves, B Cox, M Farhoud, H Valdovinos, J Jeffery, K Eliceiri, T Barnhart, R Nickles
PURPOSE: To design a linearly-filled Derenzo positron emission tomography (PET) phantom, eliminating the extraneous radioisotope volumes in a conventional reservoir-type design. This activity reduction combined with the elimination of bubbles in smaller phantom channels would significantly reduce personnel dose, radioisotope cost, and would improve image quality by reducing out-of-slice activity scatter. METHODS: A computer-aided design (CAD) was created of a modular Derenzo phantom consisting of three phantom layers with gaskets between the layers...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047856/su-f-t-500-the-effectiveness-of-a-patient-specific-bolus-made-by-using-three-dimensional-printing-technique-in-photon-radiotherapy
#13
K Fujimoto, T Shiinoki, Y Yuasa, H Hanazawa, K Shibuya
PURPOSE: A commercially available bolus (commercial-bolus) would not completely contact with the irregular shape of a patient's skin. The purposes of this study were to customize a patient specific three-dimensional (3D) bolus using a 3D printer (3D-bolus) and to evaluate its clinical feasibility for photon radiotherapy. METHODS: The 3D-bolus was designed using a treatment planning system (TPS) in DICOM-RT format. To print the 3D bolus, the file was converted into stereolithography format...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28024815/fit-of-pressed-crowns-fabricated-from-two-cad-cam-wax-pattern-process-plans-a-comparative-in%C3%A2-vitro-study
#14
Loubna Shamseddine, Rola Mortada, Khaldoun Rifai, Jose Johann Chidiac
STATEMENT OF PROBLEM: Subtractive and additive computer-aided design and computer-aided manufacturing (CAD-CAM) wax pattern processing are 2 methods of fabricating a pressed ceramic crown. Whether a subtractive milled wax pattern or a pattern from the micro-stereolithography additive process produces lithium disilicate crowns with better marginal and internal fit is unclear. MATERIALS AND METHODS: Ten silicone impressions were made for a prepared canine tooth. Each die received 2 lithium disilicate (IPS e...
December 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28024631/gold-nanoparticle-filled-biodegradable-photopolymer-scaffolds-induced-muscle-remodeling-in-vitro-and-in-vivo-findings
#15
Adam Zsedenyi, Balazs Farkas, Gaser N Abdelrasoul, Ilaria Romano, Edina Gyukity-Sebestyen, Katalin Nagy, Maria Harmati, Gabriella Dobra, Sandor Kormondi, Gabor Decsi, Istvan Balazs Nemeth, Alberto Diaspro, Fernando Brandi, Szabolcs Beke, Krisztina Buzas
Therapeutic stem cell transplantation bears the promise of new directions in organ and tissue replacement, but a number of its difficulties and perils are also well known. Our goal was to develop a method of transplantation by which the transplanted cells remain confined to the transplantation site and induce favorable processes. With the help of mask-projection excimer laser stereolithography, 3D hybrid nanoscaffolds were fabricated from biodegradable, photocurable PPF:DEF resin with incorporated gold nanoparticles (Au NPs)...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28009155/three-dimensional-printing-of-shape-memory-composites-with-epoxy-acrylate-hybrid-photopolymer
#16
Ran Yu, Xin Yang, Ying Zhang, Xiaojuan Zhao, Xiao Wu, Tingting Zhao, Yulei Zhao, Wei Huang
Four-dimensional printing, a new process to fabricate active materials through three-dimensional (3D) printing developed by MIT's Self-Assembly Lab in 2014, has attracted more and more research and development interests recently. In this paper, a type of epoxy-acrylate hybrid photopolymer was synthesized and applied to fabricate shape memory polymers through a stereolithography 3D printing technique. The glass-to-rubbery modulus ratio of the printed sample determined by dynamic mechanical analysis is as high as 600, indicating that it may possess good shape memory properties...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27998214/fabrication-of-a-highly-aligned-neural-scaffold-via-a-table-top-stereolithography-3d-printing-and-electrospinning
#17
Se-Jun Lee, Margaret Nowicki, Brent Harris, Lijie Grace Zhang
Three-dimensional (3D) bioprinting is a rapidly emerging technique in the field of tissue engineering to fabricate extremely intricate and complex biomimetic scaffolds in the range of micrometers. Such customized 3D printed constructs can be used for the regeneration of complex tissues such as cartilage, vessels, and nerves. However, the 3D printing techniques often offer limited control over the resolution and compromised mechanical properties due to short selection of printable inks. To address these limitations, we combined stereolithography and electrospinning techniques to fabricate a novel 3D biomimetic neural scaffold with a tunable porous structure and embedded aligned fibers...
January 11, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27974356/making-three-dimensional-echocardiography-more-tangible-a-workflow-for-three-dimensional-printing-with-echocardiographic-data
#18
REVIEW
Azad Mashari, Mario Montealegre-Gallegos, Ziyad Knio, Lu Yeh, Jelliffe Jeganathan, Robina Matyal, Kamal R Khabbaz, Feroze Mahmood
Three-dimensional (3D) printing is a rapidly evolving technology with several potential applications in the diagnosis and management of cardiac disease. Recently, 3D printing (i.e. rapid prototyping) derived from 3D transesophageal echocardiography (TEE) has become possible. Due to the multiple steps involved and the specific equipment required for each step, it might be difficult to start implementing echocardiography-derived 3D printing in a clinical setting. In this review, we provide an overview of this process, including its logistics and organization of tools and materials, 3D TEE image acquisition strategies, data export, format conversion, segmentation, and printing...
December 2016: Echo Research and Practice
https://www.readbyqxmd.com/read/27973958/validation-of-a-fibula-graft-cutting-guide-for-mandibular-reconstruction-experiment-with-rapid-prototyping-mandible-model
#19
Se-Ho Lim, Yeon-Ho Kim, Moon-Key Kim, Woong Nam, Sang-Hoon Kang
OBJECTIVE: We examined whether cutting a fibula graft with a surgical guide template, prepared with computer-aided design/computer-aided manufacturing (CAD/CAM), would improve the precision and accuracy of mandibular reconstruction. METHODS: Thirty mandibular rapid prototype (RP) models were allocated to experimental (N = 15) and control (N = 15) groups. Thirty identical fibular RP models were assigned randomly, 15 to each group. For reference, we prepared a reconstructed mandibular RP model with a three-dimensional printer, based on surgical simulation...
December 2016: Comput Assist Surg (Abingdon)
https://www.readbyqxmd.com/read/27934784/photoinitiator-free-3d-scaffolds-fabricated-by-excimer-laser-photocuring
#20
Balázs Farkas, Silvia Dante, Fernando Brandi
Photoinitiator-free fabrication of poly(ethylene glycol) diacrylate (PEGDA) scaffolds is achieved using a novel three-dimensional (3D) printing method called mask projected excimer laser stereolithography (MPExSL). The spatial resolution of photoinitiator-free curing is suitable for 3D layer-by-layer fabrication with a single layer thickness well controllable at tens to hundreds of microns using 248 nm wavelength for the irradiation. The photoinitiator-free scaffolds are superior compared to their counterparts fabricated by using photoinitiator molecules, showing a higher level of biocompatibility...
January 20, 2017: Nanotechnology
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