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https://www.readbyqxmd.com/read/28807205/facilitating-surgeon-understanding-of-complex-anatomy-using-a-three-dimensional-printed-model
#1
Barrett P Cromeens, William C Ray, Brad Hoehne, Fikir Abayneh, Brent Adler, Gail E Besner
BACKGROUND: 3-dimensional prints (3DP) anecdotally facilitate surgeon understanding of anatomy and decision-making. However, the actual benefit to surgeons or patients has not been quantified. This study investigates how surgeon understanding of complex anatomy is altered by a 3DP compared to computed tomography (CT) scan or CT + digital reconstruction (CT + DR). MATERIALS AND METHODS: Key anatomic features were segmented from a CT-abdomen/pelvis of pygopagus twins to build a DR and printed in color on a 3D printer...
August 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28796185/performance-of-electropun-polyacrylonitrile-nanofibrous-phases-shown-for-the-separation-of-water-soluble-food-dyes-via-utlc-vis-esi-ms
#2
Pimolpun Niamlang, Pitt Supaphol, Gertrud E Morlock
Research in the miniaturization of planar chromatography led to various approaches in manufacturing ultrathin-layer chromatography (UTLC) layers of reduced thickness (<50 µm) along with smaller instrumentation, as targeted in Office Chromatography. This novel concept merges 3D print & media technologies with miniaturized planar chromatography to realize an all-in-one instrument, in which all steps of UTLC are automated and integrated in the same tiny device. In this context, the development of electrospun polyacrylonitrile (PAN) nanofiber phases was investigated as well as its performance...
August 10, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28791302/in-vitro-laser-treatment-platform-construction-with-dental-implant-thread-surface-on-bacterial-adhesion-for-peri-implantitis
#3
Hsien-Nan Kuo, Hsiang-I Mei, Tung-Kuan Liu, Tse-Ying Liu, Lun-Jou Lo, Chun-Li Lin
This study constructs a standard in vitro laser treatment platform with dental implant thread surface on bacterial adhesion for peri-implantitis at different tooth positions. The standard clinical adult tooth jaw model was scanned to construct the digital model with 6 mm bone loss depth on behalf of serious peri-implantitis at the incisor, first premolar, and first molar. A cylindrical suite connected to the implant and each tooth root in the jaw model was designed as one experimental unit set to allow the suite to be replaced for individual bacterial adhesion...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28789516/aerosol-emissions-from-fuse-deposition-modeling-3d-printers-in-a-chamber-and-in-real-indoor-environments
#4
Marina Eller Vance, Valerie Pegues, Schuyler Van Montfrans, Weinan Leng, Linsey C Marr
Three-dimensional (3D) printers are known to emit aerosols, but questions remain about their composition and the fundamental processes driving emissions. The objective of this work was to characterize aerosol emissions from the operation of a fuse-deposition modeling 3D printer. We modeled the time- and size-resolved emissions of submicron aerosols from the printer in a chamber study, gained insight into the chemical composition of emitted aerosols using Raman spectroscopy, and measured potential for exposure to aerosols generated by 3D printers under real-use conditions in a variety of indoor environments...
August 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28772694/development-and-application-of-wood-flour-filled-polylactic-acid-composite-filament-for-3d-printing
#5
Yubo Tao, Honglei Wang, Zelong Li, Peng Li, Sheldon Q Shi
This paper presents the development of wood flour (WF)-filled polylactic acid (PLA) composite filaments for a fused deposition modeling (FDM) process with the aim of application to 3D printing. The composite filament consists of wood flour (5 wt %) in a PLA matrix. The detailed formulation and characterization of the composite filament were investigated experimentally, including tensile properties, microstructure, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD)...
March 24, 2017: Materials
https://www.readbyqxmd.com/read/28772665/process-parameter-optimization-of-extrusion-based-3d-metal-printing-utilizing-pw-ldpe-sa-binder-system
#6
Luquan Ren, Xueli Zhou, Zhengyi Song, Che Zhao, Qingping Liu, Jingze Xue, Xiujuan Li
Recently, with a broadening range of available materials and alteration of feeding processes, several extrusion-based 3D printing processes for metal materials have been developed. An emerging process is applicable for the fabrication of metal parts into electronics and composites. In this paper, some critical parameters of extrusion-based 3D printing processes were optimized by a series of experiments with a melting extrusion printer. The raw materials were copper powder and a thermoplastic organic binder system and the system included paraffin wax, low density polyethylene, and stearic acid (PW-LDPE-SA)...
March 16, 2017: Materials
https://www.readbyqxmd.com/read/28766622/functional-aqueous-droplet-networks
#7
REVIEW
Michael J Booth, Vanessa Restrepo Schild, Florence G Downs, Hagan Bayley
Droplet interface bilayers (DIBs), comprising individual lipid bilayers between pairs of aqueous droplets in an oil, are proving to be a useful tool for studying membrane proteins. Recently, attention has turned to the elaboration of networks of aqueous droplets, connected through functionalized interface bilayers, with collective properties unachievable in droplet pairs. Small 2D collections of droplets have been formed into soft biodevices, which can act as electronic components, light-sensors and batteries...
August 2, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28762959/mechanical-properties-and-cell-culture-characteristics-of-polycaprolactone-kagome-structure-scaffold-fabricated-by-precision-extruding-deposition-system
#8
Se-Hwan Lee, Yong Sang Cho, Myoung Wha Hong, Bu Kyu Lee, Yong-Doo Park, Sang-Hyug Park, Young-Yul Kim, Young-Sam Cho
To date, to enhance the mechanical properties of three-dimensional scaffolds used for bone regeneration in tissue engineering, many researchers have tried in the viewpoint of structure and chemistry. Meanwhile, in the structural engineering field, the kagome structure has been known as an excellent relative strength. In this study, to enhance the mechanical properties of a synthetic polymer scaffold used for tissue engineering, we applied the three-dimensional kagome structure to a porous scaffold for bone regeneration...
August 1, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28756962/evaluation-of-different-techniques-for-filling-simulated-c-shaped-canals-of-3-dimensional-printed-resin-teeth
#9
Tuba Gok, Ismail Davut Capar, Ilgin Akcay, Ali Keles
INTRODUCTION: The purpose of this study was to compare the ability of different root canal filling methods on the C1 root canal anatomy using 3-dimensional (3D) printer technology. METHODS: Mandibular molars were scanned with cone-beam computed tomographic (CBCT) imaging. A mandibular molar tooth with a C1 root canal configuration was selected according to images obtained from CBCT technology. The root canals were shaped with ProTaper Universal rotary instruments (Dentsply Maillefer, Ballaigues, Switzerland) and hand files...
July 27, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28753638/3d-printing-scanning-electron-microscopy-sample-holders-a-quick-and-cost-effective-alternative-for-custom-holder-fabrication
#10
Gabriel N Meloni, Mauro Bertotti
A simple and cost effective alternative for fabricating custom Scanning Electron Microscope (SEM) sample holders using 3D printers and conductive polylactic acid filament is presented. The flexibility of the 3D printing process allowed for the fabrication of sample holders with specific features that enable the high-resolution imaging of nanoelectrodes and nanopipettes. The precise value of the inner semi cone angle of the nanopipettes taper was extracted from the acquired images and used for calculating their radius using electrochemical methods...
2017: PloS One
https://www.readbyqxmd.com/read/28741350/3d-printed-and-microcontrolled-the-one-hundred-dollars-scanning-electrochemical-microscope
#11
Gabriel N Meloni
The design and fabrication of a versatile and low-cost electrochemical-scanning probe microscope (EC-SPM) is presented. The proposed equipment relies on the use of modern prototyping tools such as 3D printers and microcontroller boards and only a few "off-the-shelf" parts to deliver a simple yet powerful EC-SPM equipment capable of performing simple space-resolved electrochemical measurements. The equipment was able to perform space-resolved electrochemical measurements using a platinum ultramicroelectrode (UME) as the working electrode on a scanning electrochemical microscopy (SECM) configuration and was used to record approach curves, line scans, and array scans over an insulating substrate...
August 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28736284/adam-a-breathing-phantom-for-lung-sbrt-quality-assurance
#12
Stefania Pallotta, Silvia Calusi, Leonardo Foggi, Riccardo Lisci, Laura Masi, Livia Marrazzo, Cinzia Talamonti, Lorenzo Livi, Gabriele Simontacchi
PURPOSE: Radiotherapy treatment of moving lesions is a challenging task in which different strategies can be used to adequately treat the tumor while sparing the surrounding tissue. The complexity of these strategies requires accurate and appropriate quality assurance tests. For this purpose, ADAM (Anthropomorphic Dynamic breAthing Model), a new phantom which simulates realistic patient breathing, was developed aiming to test the image quality and dose delivery in lung cancer treatments...
July 20, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28732777/how-useful-is-3d-printing-in-maxillofacial-surgery
#13
A Louvrier, P Marty, A Barrabé, E Euvrard, B Chatelain, E Weber, C Meyer
INTRODUCTION: 3D printing seems to have more and more applications in maxillofacial surgery (MFS), particularly since the release on the market of general use 3D printers several years ago. The aim of our study was to answer 4 questions: 1. Who uses 3D printing in MFS and is it routine or not? 2. What are the main clinical indications for 3D printing in MFS and what are the kinds of objects that are used? 3. Are these objects printed by an official medical device (MD) manufacturer or made directly within the department or the lab? 4...
July 18, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28727787/feasibility-of-a-3d-printed-anthropomorphic-patient-specific-head-phantom-for-patient-specific-quality-assurance-of-intensity-modulated-radiotherapy
#14
Ji Woon Yea, Jae Won Park, Sung Kyu Kim, Dong Youn Kim, Jae Gu Kim, Chan Young Seo, Won Hyo Jeong, Man Youl Jeong, Se An Oh
This study evaluated the feasibility of utilizing a 3D-printed anthropomorphic patient-specific head phantom for patient-specific quality assurance (QA) in intensity-modulated radiotherapy (IMRT). Contoured left and right head phantoms were converted from DICOM to STL format. Fused deposition modeling (FDM) was used to construct an anthropomorphic patient-specific head phantom with a 3D printer. An established QA technique and the patient-specific head phantom were used to compare the calculated and measured doses...
2017: PloS One
https://www.readbyqxmd.com/read/28726927/custom-3d-printer-and-resin-for-18-%C3%AE-m-%C3%A3-20-%C3%AE-m-microfluidic-flow-channels
#15
Hua Gong, Bryce P Bickham, Adam T Woolley, Gregory P Nordin
While there is great interest in 3D printing for microfluidic device fabrication, to-date the achieved feature sizes have not been in the truly microfluidic regime (<100 μm). In this paper we demonstrate that a custom digital light processor stereolithographic (DLP-SLA) 3D printer and a specifically-designed, low cost, custom resin can readily achieve flow channel cross sections as small as 18 μm × 20 μm. Our 3D printer has a projected image plane resolution of 7.6 μm and uses a 385 nm LED, which dramatically increases the available selection of UV absorbers for resin formulation compared to 3D printers with 405 nm LEDs...
July 20, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28724980/handheld-co-axial-bioprinting-application-to-in-situ-surgical-cartilage-repair
#16
Serena Duchi, Carmine Onofrillo, Cathal D O'Connell, Romane Blanchard, Cheryl Augustine, Anita F Quigley, Robert M I Kapsa, Peter Pivonka, Gordon Wallace, Claudia Di Bella, Peter F M Choong
Three-dimensional (3D) bioprinting is driving major innovations in the area of cartilage tissue engineering. Extrusion-based 3D bioprinting necessitates a phase change from a liquid bioink to a semi-solid crosslinked network achieved by a photo-initiated free radical polymerization reaction that is known to be cytotoxic. Therefore, the choice of the photocuring conditions has to be carefully addressed to generate a structure stiff enough to withstand the forces phisiologically applied on articular cartilage, while ensuring adequate cell survival for functional chondral repair...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723908/sorting-cells-by-their-density
#17
Nazila Norouzi, Heran C Bhakta, William H Grover
Sorting cells by their type is an important capability in biological research and medical diagnostics. However, most cell sorting techniques rely on labels or tags, which may have limited availability and specificity. Sorting different cell types by their different physical properties is an attractive alternative to labels because all cells intrinsically have these physical properties. But some physical properties, like cell size, vary significantly from cell to cell within a cell type; this makes it difficult to identify and sort cells based on their sizes alone...
2017: PloS One
https://www.readbyqxmd.com/read/28722489/treatment-of-die-punch-fractures-with-3d-printing-technology
#18
Chunhui Chen, Leyi Cai, Chuanxu Zhang, Jianshun Wang, Xiaoshan Guo, Yifei Zhou
PURPOSE: We evaluated the feasibility, accuracy and effectiveness of applying three-dimensional (3D) printing technology for preoperative planning for die-punch fractures. METHODS: A total of 107 patients who underwent die-punch fracture surgery were enrolled in the study. They were randomly divided into two groups: 52 cases in the 3D model group and 55 cases in the routine group. A 3D digital model of each die-punch fracture was reconstructed in the 3D group. The 3D digital model was imported to a 3D printer to build the full solid model...
July 19, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28719986/three-dimensional-printing-of-surgical-clips-an-in-vitro-pilot-study-and-trial-of-efficacy
#19
Noah E Canvasser, Shuvro De, Ersin Koseoglu, Aaron H Lay, Igor Sorokin, Raul Fernandez, Jeffrey A Cadeddu
INTRODUCTION AND OBJECTIVE: Three-dimensional (3D) printing applications have increased over the past decade. Our objective was to test rapid prototyping of a 3D printed surgical clip for intraoperative use. MATERIALS AND METHODS: Our prototype was modeled after the 10 mm Weck(®) Hem-o-lok(®) polymer clip (Teleflex, Inc., Wayne, PA). A 3D computer-aided design model of the Hem-o-lok clip was reverse engineered using commercial microscopy and printing was done using an Objet Connex500 multijetting system (Stratasys, Eden Prairie, MN)...
August 11, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28712105/evaluation-of-a-low-cost-3d-printed-model-for-bronchoscopy-training
#20
Matteo Parotto, Joshua Qua Jiansen, Ahmed AboTaiban, Svetlana Ioukhova, Alisher Agzamov, Richard Cooper, Gerald O'Leary, Massimiliano Meineri
BACKGROUND: Flexible bronchoscopy is a fundamental procedure in anaesthesia and critical care medicine. Although learning this procedure is a complex task, the use of simulation-based training provides significant advantages, such as enhanced patient safety. Access to bronchoscopy simulators may be limited in low-resource settings. We have developed a low-cost 3D-printed bronchoscopy training model. METHODS: A parametric airway model was obtained from an online medical model repository and fabricated using a low-cost 3D printer...
2017: Anaesthesiology Intensive Therapy
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