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https://www.readbyqxmd.com/read/29137703/fabrication-of-a-novel-aptasensor-based-on-three-dimensional-reduced-graphene-oxide-polyaniline-gold-nanoparticle-composite-as-a-novel-platform-for-high-sensitive-and-specific-cocaine-detection
#1
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Yalda Hosseinzadeh Ardakani, Tayyebeh Madrakian
In the present research, we have developed a novel label free aptasensor based on screen printed carbon electrode (SPCE) modified with three-dimensional magnetic reduced graphene oxide(3D-MRGO)/polyaniline(PA)/gold nanoparticle(AuNP) nanocomposite for impedimetric determination of cocaine. To achieve this goal, a specific thiolated cocaine aptamer was immobilized onto the surface of synthesized nanocomposite. The signaling mechanism of the proposed aptasensor was based on increase in the [Fe(CN)6](3-/4-) charge transfer resistance (RCT) as an electrochemical probe in the presence of target analyte...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29135262/a-low-molecular-weight-gelator-composed-of-pyrene-and-fluorene-moieties-for-effective-charge-transfer-in-supramolecular-ambidextrous-gel
#2
Samala Murali Mohan Reddy, Pramod Dorishetty, George Augustine, Abhijit P Deshpande, Niraikulam Ayyadurai, Ganesh Shanmugam
Charge-transfer (CT) gel materials obtained from low-molecular-weight (LMW) compounds through a supramolecular self-assembly approach have received fascinating attention by many researchers because of their interesting material property and potential applications. However, most of the CT gel materials constructed were of organogels while the construction of CT gels in the form of a hydrogel is a challenge because of the solubility issue in water, which considerably limits the use of CT hydrogels. Herein, for the first time, we report a new LMW gelator [N(α)-(fluorenylmethoxycarbonyl)-N(ε)-(δ-butyric-1-pyrenyl)-l-lysine, (FmKPy)], composed of two functional moieties such as fluorenylmethoxycarbonyl and pyrene, which not only parade both hydro and organo (ambidextrous) supramolecular gel formation but also exhibit CT ambidextrous gels when mixed with an electron acceptor such as 2,4,7-trinitro-9-fluorenone (TNF)...
November 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29134104/king-post-truss-as-a-motif-for-internal-structure-of-meta-material-with-controlled-elastic-properties
#3
Emilio Turco, Ivan Giorgio, Anil Misra, Francesco dell'Isola
One of the most interesting challenges in the modern theory of materials consists in the determination of those microstructures which produce, at the macro-level, a class of metamaterials whose elastic range is many orders of magnitude wider than the one exhibited by 'standard' materials. In dell'Isola et al. (2015 Zeitschrift für angewandte Mathematik und Physik66, 3473-3498. (doi:10.1007/s00033-015-0556-4)), it was proved that, with a pantographic microstructure constituted by 'long' micro-beams it is possible to obtain metamaterials whose elastic range spans up to an elongation exceeding 30%...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29117294/computer-assisted-planning-and-3d-printing-assisted-modeling-for-chin-augmentation
#4
Po-Chuan Chang
Background: Patients are frequently not satisfied with the outcome of chin augmentation. Objectives: We report the use of three-dimensional (3D) imaging and printing to design custom fit porous polyethylene chin implants. Methods: Patients requesting chin augmentation received 3D computed tomography (CT) imaging of the facial area. Patients could select the chin contour they desired by viewing 3D images of their face and chin. A 3D mandible replicate was printed from the CT data, and used to sculpt the inner surface of the implant to match the shape of the mandible, and the outer surface to match the contour the patient desired...
May 30, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/29089197/the-fastest-field-sport-in-the-world-a-case-report-on-3-dimensional-printed-hurling-gloves-to-help-prevent-injury
#5
Daniel Harte, Abby Paterson
STUDY DESIGN: Case series. INTRODUCTION: Hand injuries are the most common injury observed in hurling although compliance in wearing protective gloves is reportedly low. PURPOSE OF THE STUDY: To devise a glove that offers comfort, protection and freedom of movement, using the bespoke capabilities of 3-dimensional (3D) printing. METHODS: Each player's "catching" hand was imaged using a 3D scanner to produce a bespoke glove that they later trialed and provided feedback...
October 28, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/29083526/in-vitro-evaluation-of-marrow-clot-enrichment-on-microstructure-decoration-cell-delivery-and-proliferation-of-porous-titanium-scaffolds-by-selective-laser-melting-three-dimensional-printing
#6
Qing-Qiang Yao, Jun Hu, Peng-Fei Zheng, Jia-Yi Li, Jin Zhou, Shu-Chang Tian, Bo Wei, Yan Xu, Li-Ming Wang
Titanium alloy is a clinically approved material for bone substitution. Although three-dimensional printing (3DP) fabrication technique can build up porous Ti scaffolds with the designed shape and microstructure, the biomechanical performance of 3DP Ti scaffolds still need to be improved to increase the reliability of osseointegration capacity. To address this issue, rabbit bone marrow clot (MC) is used to modify 3DP Ti scaffolds by stem cell delivery and microenvironment decoration inside the pores of these scaffolds...
October 30, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29076809/compact-3d-printed-module-for-fluorescent-and-label-free-imaging-using-evanescent-excitation
#7
Vikas Pandey, Shalini Gupta, Ravikrishnan Elangovan
Total internal reflection fluorescence (TIRF) microscopy is widely used for selective excitation and high-resolution imaging of fluorophores, and more recently label-free nanosized objects, with high vertical confinement near a liquid/solid interface. Traditionally, high numerical aperture (NA) objectives (> 1.4) are used to simultaneously generate evanescent waves and collect fluorescence emission signals which limits their use to small area imaging (< 0.1 mm2). Objective-based TIRFs are also expensive as they require dichroic mirrors and efficient notch filters to prevent specular reflection within the objective lenses...
October 27, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/29069892/efficacy-of-a-three-dimensional-printed-training-simulator-for-endoscopic-biopsy-in-the-stomach
#8
Sunpyo Lee, Ji Yong Ahn, Minkyu Han, Gin Hyug Lee, Hee Kyong Na, Kee Wook Jung, Jeong Hoon Lee, Do Hoon Kim, Kee Don Choi, Ho June Song, Hwoon-Yong Jung
Background/Aims: We used three-dimensional (3D) printing technology to create a new biopsy simulator for the stomach and investigated its efficacy and realism in endoscopic biopsy training. Methods: A novel stomach biopsy simulator, with 10 biopsy sites, was produced using a 3D printer. We enrolled 26 participants, including 10 residents, six first-year fellows, five second-year fellows, and five faculty members. We recorded and reviewed five training sessions and evaluated the simulator with questionnaires using a 7-point Likert scale...
October 27, 2017: Gut and Liver
https://www.readbyqxmd.com/read/29066588/effect-of-high-flow-nasal-cannula-on-expiratory-pressure-and-ventilation-in-infant-pediatric-and-adult-models
#9
Katie R Nielsen, Laura E Ellington, Alan J Gray, Larissa I Stanberry, Lincoln S Smith, Robert M DiBlasi
BACKGROUND: Heated and humidified high-flow nasal cannula (HFNC) is a widely used form of respiratory support; however, data regarding optimal flows for a given patient size or disease state are lacking. A comprehensive study of the physiologic effects of HFNC is needed to better understand the mechanisms of action. The objective of the current study was to quantify the effect of HFNC settings in age-specific, anatomically correct nasal airways and spontaneously breathing lung models...
October 24, 2017: Respiratory Care
https://www.readbyqxmd.com/read/29064584/accuracy-of-a-patient-specific-3d-printed-drill-guide-for-placement-of-cervical-transpedicular-screws
#10
Sinead E Hamilton-Bennett, Bill Oxley, Sebastien Behr
OBJECTIVE: To develop a patient-specific 3-dimensional (3D) printed drill guide for placement of cervical transpedicular screws and to assess its accuracy. STUDY DESIGN: Prospective case-series. SAMPLE POPULATION: Thirty-two cervical pedicle screws (CPS) placed in 3 large breed dogs. METHODS: Computed tomographic (CT) data of the cervical vertebrae were exported to a medical image processing software and 3D virtual vertebral models were created for each vertebra...
October 24, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/29016991/case-report-of-asthma-associated-with-3d-printing
#11
R House, N Rajaram, S M Tarlo
Background: Three-dimensional (3D) printing is being increasingly used in manufacturing and by small business entrepreneurs and home hobbyists. Exposure to airborne emissions during 3D printing raises the issue of whether there may be adverse health effects associated with these emissions. Aims: We present a case of a worker who developed asthma while using 3D printers, which illustrates that respiratory problems may be associated with 3D printer emissions. Case report: The patient was a 28-year-old self-employed businessman with a past history of asthma in childhood, which had resolved completely by the age of eight...
August 23, 2017: Occupational Medicine
https://www.readbyqxmd.com/read/28977423/three-dimensional-printed-models-for-surgical-planning-of-complex-congenital-heart-defects-an-international-multicentre-study
#12
Israel Valverde, Gorka Gomez-Ciriza, Tarique Hussain, Cristina Suarez-Mejias, Maria N Velasco-Forte, Nicholas Byrne, Antonio Ordoñez, Antonio Gonzalez-Calle, David Anderson, Mark G Hazekamp, Arno A W Roest, Jose Rivas-Gonzalez, Sergio Uribe, Issam El-Rassi, John Simpson, Owen Miller, Enrique Ruiz, Ignacio Zabala, Ana Mendez, Begoña Manso, Pastora Gallego, Freddy Prada, Massimiliano Cantinotti, Lamia Ait-Ali, Carlos Merino, Andrew Parry, Nancy Poirier, Gerald Greil, Reza Razavi, Tomas Gomez-Cia, Amir-Reza Hosseinpour
OBJECTIVES: To evaluate the impact of 3D printed models (3D models) on surgical planning in complex congenital heart disease (CHD). METHODS: A prospective case-crossover study involving 10 international centres and 40 patients with complex CHD (median age 3 years, range 1 month-34 years) was conducted. Magnetic resonance imaging and computed tomography were used to acquire and segment the 3D cardiovascular anatomy. Models were fabricated by fused deposition modelling of polyurethane filament, and dimensions were compared with medical images...
December 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28969918/marginal-and-internal-fit-of-pressed-lithium-disilicate-inlays-fabricated-with-milling-3d-printing-and-conventional-technologies
#13
Foudda R Homsy, Mutlu Özcan, Marwan Khoury, Zeina A K Majzoub
STATEMENT OF PROBLEM: The subtractive and additive computer-aided design and computer-aided manufacturing (CAD-CAM) of lithium disilicate partial coverage restorations is poorly documented. PURPOSE: The purpose of this in vitro study was to compare the marginal and internal fit accuracy of lithium disilicate glass-ceramic inlays fabricated with conventional, milled, and 3-dimensional (3D) printed wax patterns. MATERIAL AND METHODS: A dentoform mandibular first molar was prepared for a mesio-occlusal ceramic inlay...
September 29, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28962741/effect-of-print-layer-height-and-printer-type-on-the-accuracy-of-3-dimensional-printed-orthodontic-models
#14
Christian S Favero, Jeryl D English, Benjamin E Cozad, John O Wirthlin, Megan M Short, F Kurtis Kasper
INTRODUCTION: Three-dimensional (3D) printing technologies enable production of orthodontic models from digital files; yet a range of variables associated with the process could impact the accuracy and clinical utility of the models. The objective of this study was to investigate the effect of print layer height on the accuracy of orthodontic models printed 3 dimensionally using a stereolithography format printer and to compare the accuracy of orthodontic models fabricated with several commercially available 3D printers...
October 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28934914/new-concept-of-3d-printed-bone-clip-polylactic-acid-hydroxyapatite-silk-composite-for-internal-fixation-of-bone-fractures
#15
Yeung Kyu Yeon, Hae Sang Park, Jung Min Lee, Ji Seung Lee, Young Jin Lee, Md Tipu Sultan, Ye Bin Seo, Ok Joo Lee, Soon Hee Kim, Chan Hum Park
Open reduction with internal fixation is commonly used for the treatment of bone fractures. However, postoperative infection associated with internal fixation devices (intramedullary nails, plates, and screws) remains a significant complication, and it is technically difficult to fix multiple fragmented bony fractures using internal fixation devices. In addition, drilling in the bone to install devices can lead to secondary fracture, bone necrosis associated with postoperative infection. In this study, we developed bone clip type internal fixation device using three- dimensional (3D) printing technology...
September 22, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28895433/corrective-osteotomies-of-phalangeal-and-metacarpal-malunions-using-patient-specific-guides-ct-based-evaluation-of-the-reduction-accuracy
#16
Stefanie Hirsiger, Andreas Schweizer, Junichi Miyake, Ladislav Nagy, Philipp Fürnstahl
BACKGROUND: Surgical planning of corrective osteotomies is traditionally based on conventional radiographs and clinical findings. In the past 10 years, 3-dimensional (3D) preoperative planning approaches with patient-specific guides have been developed. However, the application of this technology to posttraumatic deformities of the metacarpals and phalangeal bones has not yet been investigated. Our goal was to evaluate the feasibility of the surgical application to the latter and to evaluate the extent and precision of correction...
September 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28863884/how-accurate-are-implant-surgical-guides-produced-with-desktop-stereolithographic-3-dimentional-printers
#17
George R Deeb, Riley K Allen, V Patrick Hall, Daniel Whitley, Daniel M Laskin, Sompop Bencharit
PURPOSE: The use of tooth-supported static stereolithographic guides has greatly improved the ability to ideally place implants. This study was designed to determine the accuracy of in office-printed implant surgical guides. MATERIALS AND METHODS: Using 3shape Implant Studio, a treatment plan for implant placement for tooth 8 was developed using a digital intraoral scan from a Trios scanner and cone-beam computed tomography. Ten stereolithographic guides were printed using a Form2 3-dimensional printer...
August 5, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28861924/highly-concentrated-ultrathin-nickel-hydroxide-nanosheet-ink-for-wearable-energy-storage-devices
#18
Peipei Shi, Rong Chen, Li Hua, Li Li, Ruyi Chen, Yujiao Gong, Chenyang Yu, Jinyuan Zhou, Bin Liu, Gengzhi Sun, Wei Huang
Solution-based techniques are considered as a promising strategy for scalable fabrication of flexible electronics owing to their low-cost and high processing speed. The key to the success of these techniques is dominated by the ink formulation of active nanomaterials. This work successfully prepares a highly concentrated two dimensional (2D) crystal ink comprised of ultrathin nickel hydroxide (Ni(OH)2 ) nanosheets with an average lateral size of 34 nm. The maximum concentration of Ni(OH)2 nanosheets in water without adding any additives reaches as high as 50 mg mL(-1) , which can be printed on arbitrary substrates to form Ni(OH)2 thin films...
September 1, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28838835/biomechanical-evaluation-of-a-novel-hybrid-reconstruction-plate-for-mandible-segmental-defects-a-finite-element-analysis-and-fatigue-testing
#19
Cheng-Hsien Wu, Yang-Sung Lin, Yu-Shen Liu, Chun-Li Lin
PURPOSE: This study develops a novel hybrid (NH) reconstruction plate that can provide load-bearing strength, secure the bone transplant at the prosthesis favored position, and also maintain the facial contour in a mandibular segmental defect. A new patient-match bending technique which uses a three-dimensional printing (3DP) stamping process is developed to increase the interfacial fit between the reconstruction plate and mandibular bone. MATERIALS AND METHODS: The NH reconstruction plate was designed to produce a continuous profile with non-uniform thickness and triangular cross-screw patterns with a locking-screw feature at the plate base...
October 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28822675/precise-osteotomies-for-mandibular-distraction-in-infants-with-robin-sequence-using-virtual-surgical-planning
#20
C M Resnick
Mandibular distraction osteogenesis (MDO) has become the first-line operation in many centers for the management of obstructive sleep apnea (OSA) in infants with (Pierre) Robin sequence (RS) not relieved by non-surgical approaches. Preoperative virtual surgical planning (VSP) may improve precision and decrease complications for this operation. This article reports a retrospective study of RS infants who underwent MDO for OSA using preoperative VSP and three-dimensionally printed cutting guides performed by one surgeon...
August 16, 2017: International Journal of Oral and Maxillofacial Surgery
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