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https://www.readbyqxmd.com/read/28337011/ptfe-tape-inspiration
#1
H Stean
No abstract text is available yet for this article.
March 24, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28301295/an-in-vitro-tensile-strength-study-on-suturing-technique-and-material
#2
Albert González-Barnadas, Octavi Camps-Font, Dunia Espanya-Grifol, Antoni España-Tost, Rui Figueiredo, Eduard Valmaseda-Castellón
Suture technique and materials are important in preventing complications like wound dehiscences. The purpose of this study was to determine the tensile strength of different suturing techniques, comparing several materials with different diameters. One hundred and sixty sutures were performed using silk, e-PTFE and two types of polyamide (monofilament and Supramid®). Ten simple, 10 horizontal mattress and 10 combinations of the two stitches were performed with the 4-0 gauge of each material. Additionally, 10 simple sutures were performed with the 5-0 gauge of each material...
March 16, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28301016/deflection-and-flexural-strength-effects-on-the-roughness-of-aesthetic-coated-orthodontic-wires
#3
Cibele Gonçalves de Albuquerque, Américo Bortolazzo Correr, Giovana Cherubini Venezian, Milton Santamaria, Carlos Alberto Tubel, Silvia Amélia Scudeler Vedovello
The aim was to evaluate the flexural strength and the effects of deflection on the surface roughness of esthetic orthodontic wires. The sample consisted of 70 archwire 0.014-inch: polytetrafluorethylene (PTFE)-coated Nickel-Titanium (Niti) archwires (Titanol Cosmetic-TC, Flexy Super Elastic Esthetic-FSE, esthetic Nickel Titanium Wire-ANT); epoxy resin-coated Niti archwires (Spectra-S, Niticosmetic-TEC); gold and rhodium coated Niti (Sentalloy-STC) and a control group (superelastic Niti (Nitinol-NS). The initial roughness was evaluated with a rugosimeter...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28296517/therapeutic-algorithm-for-congenital-ptosis-repair-with-levator-resection-and-frontalis-suspension-results-and-literature-review
#4
Riccardo Gazzola, Elena Piozzi, Luca Vaienti, Franz Wilhelm Baruffaldi Preis
BACKGROUND: Several treatments have been described for the treatment of congenital ptosis, but there are few studies that analyze the effectiveness of a therapeutic approach rather than a single technique. AIMS: In this study, we aim to evaluate the effectiveness of our therapeutic algorithm, which relies on levator muscle resection and frontalis suspension with silicone rods, polytetrafluoroethylene (PTFE), or autologous fascia lata. METHODS: We retrospectively analyzed all patients affected by congenital ptosis who underwent corrective surgery at a single department between January 1998 and January 2016...
March 15, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/28290661/epitaxy-of-ferroelectric-p-vdf-trfe-films-via-removable-ptfe-templates-and-its-application-in-semiconducting-ferroelectric-blend-resistive-memory
#5
Wei Xia, Christian Peter, Junhui Weng, Jian Zhang, Herbert Kliem, Yulong Jiang, Guodong Zhu
Ferroelectric polymer based devices exhibit great potentials in low-cost and flexible electronics. To meet the requirements of both low voltage operation and low energy consumption, thickness of ferroelectric polymer films is usually required to be less than, for example, 100 nm. However, decrease of film thickness is also accompanied by the degradation of both crystallinity and ferroelectricity and also the increase of current leakage, which surely degrades device performance. Here we report one epitaxy method based on removable poly(tetrafluoroethylene) (PTFE) templates for high-quality fabrication of ordered ferroelectric polymer thin films...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28278107/plasma-treatment-of-polyethersulfone-membrane-for-benzene-removal-from-water-by-air-gap-membrane-distillation
#6
Sara Pedram, Hamid Reza Mortaheb, Farzaneh Arefi-Khonsari
In order to obtain a durable cost-effective membrane for membrane distillation (MD) process, flat sheet polyethersulfone (PES) membranes were modified by an atmospheric pressure nonequilibrium plasma generated using a dielectric barrier discharge in a mixture of argon and hexamethyldisiloxane as the organosilicon precursor. The surface properties of the plasma-modified membranes were characterized by water contact angle (CA), liquid entry pressure, X-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy...
March 13, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28275427/resection-and-reconstruction-following-recurrent-malignant-phyllodes-case-report-and-review-of-literature
#7
Aashish Rajesh, Mohammed Farooq
INTRODUCTION: Phyllodes tumors are uncommon biphasic fibroepithelial neoplasms of the breast of varying malignant potential occurring in middle aged women. They exhibit diverse biological behavior. Margin free excision is the mainstay of treatment. CASE PRESENTATION: A 27 year-old lady was referred with a painless ulceroproliferative right breast lesion which had rapidly progressed over six months. Three years back, she had been diagnosed with a borderline phyllodes tumor and underwent a wide local excision followed by a right mastectomy for recurrence...
April 2017: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/28269994/holmium-yag-laser-and-guidewires-is-there-a-durability-difference-among-guidewires-against-laser-energy-an-in-vitro-experimental-study
#8
Sahin Bagbanci
Purpose To evaluate the durability differences between five different type of guidewire against laser energy in an in-vitro experimental ureteral model. Methods The study was performed at the Department of Urology, Medicine Faculty of Ahi Evran University. An in-vitro experimental ureteral model was created for the work; a silicon ureteral model in a saline filled container. Experiments were performed on five different type of guidewire; ZIPwire, Sensor PTFE Nitinol guidewire, Roadrunner® PC wire guide, Amplatz Super Stiff and Zebra Urologic Guidewire...
March 7, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28269739/comparison-of-hexagonal-crystal-structures-between-fluorapatite-and-polytetrafluoroethylene
#9
REVIEW
Masayuki Okazaki
The crystallographic properties of fluorapatite (FAp) and polytetrafluoroethylene (PTFE) as biomedical materials were compared. Both materials contain fluorine and casually belong to the hexagonal crystal system. It is interesting that FAp is an inorganic ionic crystal, while PTFE is an organic covalent-bond crystal. Generally, fluorine contributes to the physicochemical stability and in some cases to the biocompatibility. The crystal structure of FAp was initially analyzed in 1930 by Náray-Szabó, although the analysis of hydroxyapatite (HAp) was markedly delayed until 1964...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28268107/prosthetic-bypass-for-restenosis-after-endarterectomy-or-stenting-of-the-carotid-artery
#10
Giulio Illuminati, Romain Belmonte, Fabrice Schneider, Giulia Pizzardi, Francesco G Calió, Jean-Baptiste Ricco
OBJECTIVE: The objective of this study was to evaluate the results of prosthetic carotid bypass (PCB) with polytetrafluoroethylene (PTFE) grafts as an alternative to carotid endarterectomy (CEA) in treatment of restenosis after CEA or carotid artery stenting (CAS). METHODS: From January 2000 to December 2014, 66 patients (57 men and 9 women; mean age, 71 years) presenting with recurrent carotid artery stenosis ≥70% (North American Symptomatic Carotid Endarterectomy Trial [NASCET] criteria) were enrolled in a prospective study in three centers...
March 4, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28265185/on-compression-and-damage-evolution-in-two-thermoplastics
#11
N K Bourne, S C Garcea, D S Eastwood, S Parry, C Rau, P J Withers, S A McDonald, E N Brown
The well-known Taylor cylinder impact test, which follows the impact of a flat-ended cylindrical rod onto a rigid stationary anvil, is conducted over a range of impact speeds for two polymers, polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK). In previous work, experiments and a model were developed to capture the deformation behaviour of the cylinder after impact. These works showed a region in which spatial and temporal variation of both longitudinal and radial deformation provided evidence of changes in phase within the material...
January 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28260369/a-new-generation-of-solid-phase-microextraction-coatings-for-complementary-separation-approaches-a-step-toward-comprehensive-metabolomics-and-multiresidue-analyses-in-complex-matrices
#12
Emanuela Gionfriddo, Ezel Boyaci, Janusz Pawliszyn
In this work, a new generation of SPME coatings based on polytetrafluoroethylene amorphous fluroplastics (PTFE AF 2400) as a particle binder is presented. The developed coating was tested for thermal and solvent-assisted desorption, demonstrat-ing its compatibility with both gas- and liquid-chromatographic platforms. The incorporation of hydrophilic-lipophilic bal-ance (HLB) adsorptive particles provided optimal extraction coverage for analytes bearing a broad range of hydrophobi-cities, molecular weights, and of varied chemical diversity...
March 4, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28259459/concentrical-coils-counter-current-chromatography-for-natural-products-isolation-salvia-miltiorrhiza-bunge-as-example
#13
Lihong Zhang, Yanyan Wang, Xiuyun Guo, Shihua Wu
Countercurrent chromatography (CCC) is an efficient separation technique without the solid support matrix, largely depending on the partition of two-immiscible liquid phases in the separation column. Since the helical coil planet centrifuge was invented in early 1970s by Yoichiro Ito, a series of coils columns, including spiral coils and conical coils columns have been developed for CCC separation. In this work, we introduced a new simple and efficient concentrical coils column for CCC separation, which was prepared by winding the whole polytetrafluoroethylene (PTFE) tube into the circular grooves from the rotation axis in the same direction...
March 31, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28255132/extra-anatomical-veno-venous-surgical-bypass-for-central-vein-occlusion-in-patients-with-ipsilateral-arterio-venous-fistula-avf-for-haemodialysis-a-single-centre-experience
#14
K S Saravana, A A Zainal
OBJECTIVE: Central vein occlusion is a common complication related to central vein catheter insertion for haemodialysis which can be unmasked by an ipsilateral fistula creation, leading to a dysfunctional arteriovenous fistula (AVF). We describe an extra-anatomical venous bypass surgical procedure performed to maintain vascular access and reduce the symptoms of swelling of the ipsilateral upper limb, neck and face. MATERIALS AND METHODS: We report 20 consecutive patients with end-stage renal failure (ESRF) who had central vein occlusion and were not amenable to endovascular intervention...
February 2017: Medical Journal of Malaysia
https://www.readbyqxmd.com/read/28250998/a-novel-procedure-for-the-immediate-reconstruction-of-severely-resorbed-alveolar-sockets-for-advanced-periodontal-disease
#15
Mario Aimetti, Valeria Manavella, Luca Cricenti, Federica Romano
Background. Several clinical techniques and a variety of biomaterials have been introduced over the years in an effort to overcome bone remodeling and resorption after tooth extraction. However, the predictability of these procedures in sockets with severely resorbed buccal/lingual plate due to periodontal disease is still unknown. Case Description. A patient with advanced periodontitis underwent extraction of upper right lateral and central incisors. The central incisor exhibited complete buccal bone plate loss and a 9 mm vertical bone deficiency on its palatal side...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28240555/poly-vinylidene-fluoride-pvdf-binder-degradation-in-li-o2-batteries-a-consideration-for-the-characterization-of-lithium-superoxide
#16
Joseph K Papp, Jason D Forster, Colin M Burke, Hyo Won Kim, Alan C Luntz, Robert M Shelby, Jeffrey J Urban, Bryan D McCloskey
We show that a common Li-O2 battery cathode binder, poly(vinylidene fluoride) (PVDF), degrades in the presence of reduced oxygen species during Li-O2 discharge when adventitious impurities are present. This degradation process forms products that exhibit Raman shifts (∼1133 and 1525 cm(-1)) nearly identical to those reported to belong to lithium superoxide (LiO2), complicating the identification of LiO2 in Li-O2 batteries. We show that these peaks are not observed when characterizing extracted discharged cathodes that employ poly(tetrafluoroethylene) (PTFE) as a binder, even when used to bind iridium-decorated reduced graphene oxide (Ir-rGO)-based cathodes similar to those that reportedly stabilize bulk LiO2 formation...
February 27, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28238182/quantifying-trace-elements-in-the-emitted-particulate-matter-during-cooking-and-health-risk-assessment
#17
Soudabeh Gorjinezhad, Aiymgul Kerimray, Mehdi Amouei Torkmahalleh, Melek Keleş, Fatma Ozturk, Philip K Hopke
Particulate matter (PM) measurements were conducted during heating corn oil, heating corn oil mixed with the table salt and heating low fat ground beef meat using a PTFE-coated aluminum pan on an electric stove with low ventilation. The main objectives of this study were to measure the size segregated mass concentrations, emission rates, and fluxes of 24 trace elements emitted during heating cooking oil or oil with salt and cooking meat. Health risk assessments were performed based on the resulting exposure to trace elements from such cooking activities...
February 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28236364/intra-gastric-migration-of-a-mesenterico-portal-polytetrafluoroethylene-ptfe-jump-graft-after-liver-transplantation
#18
Francesco Esposito, Chetana Lim, Chady Salloum, Michael Osseis, Laurence Baranes, Aurelien Amiot, Philippe Compagnon, Daniel Azoulay
No abstract text is available yet for this article.
February 25, 2017: Liver Transplantation
https://www.readbyqxmd.com/read/28228875/traumatic-nonanastomotic-axilloprofundal-ptfe-bypass-rupture-a-case-report
#19
Borna K Barth, Fabian Hässler, Oliver Graubitz
A 76-year-old male patient was admitted to our emergency department with painful swelling of the right lateral chest after a fall. Imaging revealed a hematoma, secondary to rupture of a synthetic axilloprofundal bypass. In an emergency surgical procedure, the spelled hematoma was evacuated and the graft legs were successfully ligated. The patient was discharged after an uneventful hospital stay. Traumatic bypass rupture because of blunt trauma is an exceedingly rare event; however, it must be taken into consideration in a patient with bypass surgery in his/her history...
March 2017: Radiology case reports
https://www.readbyqxmd.com/read/28226294/extruded-dielectric-sample-tubes-of-complex-cross-section-for-epr-signal-enhancement-of-aqueous-samples
#20
Jason W Sidabras, Richard R Mett, James S Hyde
This paper builds on the work of Mett and Hyde (2003) and Sidabras et al. (2005) where multiple flat aqueous sample cells placed perpendicular to electric fields in microwave cavities were used to reduce the RF losses and increase the EPR signal. In this work, we present three novel sample holders for loop-gap resonators (LGRs) and cylindrical cavity geometries. Two sample holders have been commissioned and built by polytetrafluoroethylene (PTFE) extrusion techniques: a 1mm O.D. capillary with a septum down the middle, named DoubleDee, and a 3...
February 14, 2017: Journal of Magnetic Resonance
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