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https://www.readbyqxmd.com/read/27821332/transparent-wear-resistant-superhydrophobic-and-superoleophobic-poly-dimethylsiloxane-pdms-surfaces
#1
Samuel Martin, Bharat Bhushan
Superoleophobic surfaces that exhibit self-cleaning, antifouling, low-drag, and anti-smudge properties with high transparency are of interest in industrial applications including optical devices, solar panels, and self-cleaning windows. In many superoleophobic surfaces created to date, the lack of mechanical durability has been an issue. In this work, for the first time, transparent, wear-resistant, superhydrophobic and superoleophobic surfaces were developed for polydimethylsiloxane (PDMS) using a simple and scalable fabrication technique...
February 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27813260/clinical-safety-and-wear-resistance-of-the-phospholipid-polymer-grafted-highly-cross-linked-polyethylene-liner
#2
Toru Moro, Yoshio Takatori, Sakae Tanaka, Kazuhiko Ishihara, Hiromi Oda, Yoon Taek Kim, Takashige Umeyama, Eisei Fukatani, Hideya Ito, Masayuki Kyomoto, Hirofumi Oshima, Takeyuki Tanaka, Hiroshi Kawaguchi, Kozo Nakamura
To reduce the production of wear particles and subsequent aseptic loosening, we created a human articular cartilage-mimicked surface for a highly cross-linked polyethylene liner, whose surface grafted layer consisted of a biocompatible phospholipid polymer, poly(2-methacryloyloxyethyl phosphorylcholine). Although our previous in vitro findings showed that poly(2-methacryloyloxyethyl phosphorylcholine)-grafted particles were biologically inert and caused no subsequent bone resorptive responses, and poly(2-methacryloyloxyethyl phosphorylcholine) grafting markedly decreased wear in hip joint simulator tests, the clinical safety, and in vivo wear resistance of poly(2-methacryloyloxyethyl phosphorylcholine)-grafted highly cross-linked polyethylene liners remained open to question...
November 3, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27783768/association-between-oral-health-status-and-central-obesity-among-brazilian-independent-living-elderly
#3
Carla Thais Rosada Peruchi, Regina Célia Poli-Frederico, Alexandrina Aparecida Maciel Cardelli, Marina de Lourdes Calvo Fracasso, Carina Gisele Costa Bispo, Rejane Dias Neves-Souza, Jefferson Rosa Cardoso, Sandra Mara Maciel
The aim of this study was to investigate the association between oral health status and central obesity (CO) in Brazilian independent-living elderly. A cross-sectional study was carried out in a sample of 489 elderly, who were participants of the Study on Aging and Longevity, in Londrina, state of Parana. The number of natural teeth and use of prostheses were evaluated according to the World Health Organization criteria. The presence of CO was assessed using measures of waist circumference (WC) and waist-hip ratio (WHR)...
October 24, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27766256/histopathological-analysis-of-peek-wear-particle-effects-on-the-synovial-tissue-of-patients
#4
A C Paulus, S Haßelt, V Jansson, A Giurea, H Neuhaus, T M Grupp, S Utzschneider
Introduction. Increasing interest developed in the use of carbon-fiber-reinforced-poly-ether-ether-ketones (CFR-PEEK) as an alternative bearing material in knee arthroplasty. The effects of CFR-PEEK wear in in vitro and animal studies are controversially discussed, as there are no data available concerning human tissue. The aim of this study was to analyze human tissue containing CFR-PEEK as well as UHMWPE wear debris. The authors hypothesized no difference between the used biomaterials. Methods and Materials...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27737459/friction-measurements-on-contact-lenses-in-a-physiologically-relevant-environment-effect-of-testing-conditions-on-friction
#5
Olof Sterner, Rudolf Aeschlimann, Stefan Zürcher, Kathrine Osborn Lorenz, Joseph Kakkassery, Nicholas D Spencer, Samuele G P Tosatti
Purpose: To characterize the effect of lubricant composition and in vitro ageing on the coefficient of friction (CoF) of a wide range of commercially available soft contact lenses (SCLs). Methods: The CoF of SCLs was characterized by means of microtribometry against a mucin-coated glass disk. One reusable (RU) silicone-hydrogel (SiHy) lens, senofilcon A, and two daily disposable (DD) lenses, etafilcon A (hydrogel) and nelfilcon A (hydrogel), were tested under different lubricant solutions, including a tear-like fluid (TLF) containing proteins and lipids...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27664023/extended-wear-therapeutic-contact-lens-fabricated-from-timolol-imprinted-carboxymethyl-chitosan-g-hydroxy-ethyl-methacrylate-g-poly-acrylamide-as-a-onetime-medication-for-glaucoma
#6
T S Anirudhan, Anoop S Nair, J Parvathy
An extended wear therapeutic contact lens (TCL) for the sustained delivery of timolol maleate (TML) was fabricated based on molecular imprinting technique. The designed TCL comprised of a TML imprinted copolymer of carboxymethyl chitosan-g-hydroxy ethyl methacrylate-g-polyacrylamide (CmCS-g-HEMA-g-pAAm) embedded onto a poly HEMA matrix (pHEMA). Successful reloading of TML onto the lens was monitored using a simple and novel UV-Visible spectrophotometric method which showed an excellent reloading capacity of 6...
December 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27650587/synthesis-and-characterization-of-a-zwitterionic-hydrogel-blend-with-low-coefficient-of-friction
#7
Allen O Osaheni, Eric B Finkelstein, Patrick T Mather, Michelle M Blum
: Hydrogels display a great deal of potential for a wide variety of biomedical applications. Often times the performance of these biomimetic materials is limited due to inferior friction and wear properties. This manuscript presents a method inspired by the tribological phenomena observed in nature for enhancing the lubricious properties of poly (vinyl alcohol) (PVA) hydrogels. This was achieved by blending PVA with various amounts of zwitterionic polymer, poly ([2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide)) (pMEDSAH)...
September 17, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27443224/systemic-effects-of-cobalt-toxicity-after-revision-hip-replacement-can-manifest-in-intermediate-to-long-term-follow-up
#8
Nijil L Vasukutty, Tahawwar Hasnat Ahmad Minhas
INTRODUCTION: Metal toxicity from metal-on-metal hip replacements is now well documented and several large series have reported local reactions. Although less common, there are reports of similar reactions from failed ceramic liners. Systemic effects documented in literature have been grouped into cardiac, neuro-ocular and thyroid signs. METHODS AND RESULTS: We report a case of a patient who had revision for fractured ceramic liner to metal on polyethylene. Third body effect of the ceramic particles led to wear through of the poly liner and the head directly articulating with metal shell...
2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27425829/impact-resistance-of-oil-immersed-lignum-vitae
#9
Wei Yin, Lei Shan, Hongyu Lu, Yelong Zheng, Zhiwu Han, Yu Tian
Biological materials immersed in vegetable and mineral oil, such as rattan armor and wooden sleepers, have been extensively used since ancient times because of their excellent mechanical properties. This study quantitatively investigated the viscoelasticity and tribological performance of lignum vitae immersed in poly-alpha-olefin (PAO) and tung oils (Aleuritesfordii Hemsl.) to reveal the mechanism of impact resistance. The acceleration of samples immersed in tung oil was higher than that of dry and PAO-immersed samples in the first impact...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27273727/modified-peek-resin-bonded-fixed-dental-prosthesis-for-a-young-cleft-lip-and-palate-patient
#10
Efstathia Andrikopoulou, Panagiotis Zoidis, Ioli-Ioanna Artopoulou, Asterios Doukoudakis
OBJECTIVE: This clinical report presents the use of a modified poly ether-ether ketone material as an alternative material for the fabrication of resin-bonded fixed dental prosthesis (RBFDP) framework. This new material can be used for patients allergic to metals, maintaining the same high esthetic demand of ceramics, presenting light weightness and a flexibility similar to bone as a distinct advantage over ceramic materials. CONCLUSIONS: The use of a BioHPP RBFDP framework could be considered as an alternative restoration for the replacement of missing lateral incisors in young patients with cleft palate defects...
July 2016: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/27265613/oil-soluble-polymer-brush-grafted-nanoparticles-as-effective-lubricant-additives-for-friction-and-wear-reduction
#11
Roger A E Wright, Kewei Wang, Jun Qu, Bin Zhao
The development of high performance lubricants has been driven by increasingly growing industrial demands and environmental concerns. Herein, we demonstrate oil-soluble polymer brush-grafted inorganic nanoparticles (hairy NPs) as highly effective lubricant additives for friction and wear reduction. A series of oil-miscible poly(lauryl methacrylate) brush-grafted silica and titania NPs were synthesized by surface-initiated atom transfer radical polymerization. These hairy NPs showed exceptional stability in poly(alphaolefin) (PAO) base oil; no change in transparency was observed after being kept at -20, 22, and 100 °C for ≥55 days...
July 18, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27163783/oil-soluble-silver-organic-molecule-for-in-situ-deposition-of-lubricious-metallic-silver-at-high-temperatures
#12
Michael Desanker, Blake Johnson, Afif M Seyam, Yip-Wah Chung, Hassan S Bazzi, Massimiliano Delferro, Tobin J Marks, Q Jane Wang
A major challenge in lubrication technology is to enhance lubricant performance at extreme temperatures that exceed conventional engine oil thermal degradation limits. Soft noble metals such as silver have low reactivity and shear strength, which make them ideal solid lubricants for wear protection and friction reduction between contacting surfaces at high temperatures. However, achieving adequate dispersion in engine lubricants and metallic silver deposition over predetermined temperatures ranges presents a significant chemical challenge...
June 1, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27072786/highly-stretchable-non-volatile-nylon-thread-memory
#13
Ting-Kuo Kang
UNLABELLED: Integration of electronic elements into textiles, to afford e-textiles, can provide an ideal platform for the development of lightweight, thin, flexible, and stretchable e-textiles. This approach will enable us to meet the demands of the rapidly growing market of wearable-electronics on arbitrary non-conventional substrates. However the actual integration of the e-textiles that undergo mechanical deformations during both assembly and daily wear or satisfy the requirements of the low-end applications, remains a challenge...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27066695/preparation-of-high-thermal-stability-polysulfone-microcapsules-containing-lubricant-oil-and-its-tribological-properties-of-epoxy-composites
#14
Haiyan Li, Qing Wang, Meiling Li, Yexiang Cui, Yanji Zhu, Baohui Wang, Huaiyuan Wang
Polysulfone (PSF) microcapsules containing lubricant oil have been successfully prepared using solvent evaporation method. The results show that lubricant oil was successfully encapsulated and the encapsulation capacity of about 56.0 wt.% was achieved. The uniform microcapsules have nearly spherical shape and quite smooth outer surface. The mean diameter is approximately 156 and 169 μm by using different dispersant solutions. The wall material is porous in structure with wall thickness of about 20 μm...
May 2016: Journal of Microencapsulation
https://www.readbyqxmd.com/read/26999407/plasma-engineered-surfaces-for-orthopedic-devices
#15
Susan Farhat, Mary Gilliam, Cheryl Samaniego, Nate Dwarshuis, Julia Carson, Benjamin Peterson, Ali Zand
Atmospheric pressure plasma was used to graft various biocompatible polymers to the surface of ultra-high molecular weight polyethylene (UHMWPE). Polymers used as grafts in this study were poly(2-hydroxyethylmethacrylate) (PHEMA) and polyethylene glycol (PEG). A significant decrease in contact angle was noted for grafted surfaces, indicating increased hydrophilicity. Surface functionalities were verified using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The wear properties of the coatings were determined by weight loss under conditions of a random motion pin-on-plate apparatus with the coated polyethylene plaques immersed in DI water...
June 2016: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/26970769/analysis-of-friction-between-articular-cartilage-and-polyvinyl-alcohol-hydrogel-artificial-cartilage
#16
Feng Li, Anmin Wang, Chengtao Wang
Many biomaterials are being used to repair damaged articular cartilage. In particular, poly vinyl alcohol hydrogel has similar mechanical properties to natural cartilage under compressive and shearing loading. Here, three-factor and two-level friction experiments and long-term tests were conducted to better evaluate its tribological properties. The friction coefficient between articular cartilage and the poly vinyl alcohol hydrogel depended primarily on the three factors of load, speed, and lubrication. When the speed increased from 10 to 20 mm/s under a load of 10 N, the friction coefficient increased from 0...
May 2016: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/26652446/improving-bone-cement-toughness-and-contrast-agent-confinement-by-using-acrylic-branched-polymers
#17
Maria H Lissarrague, Mirta L Fascio, Silvia Goyanes, Norma B D'Accorso
A new biomedical material to be used as part of acrylic bone cement formulations is described. This new material is tough, its Young's Modulus is similar to the one of poly (methylmethacrylate) and the contrast agent, usually employed in acrylic bone cements, is homogeneously distributed among the polymeric matrix. Additionally, its wear coefficient is 66% lower than the one measured in poly(methyl methacrylate). The developed material is a branched polymer with polyisoprene backbone and poly(methyl methacrylate) side chains, which are capable of retaining barium sulphate nanoparticles thus avoiding their aggregation...
February 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/26631201/preliminary-results-of-a-posterior-augmented-glenoid-compared-to-an-all-polyethylene-standard-glenoid-in-anatomic-total-shoulder-arthroplasty
#18
MULTICENTER STUDY
Thomas W Wright, Sean G Grey, Christopher P Roche, Logan Wright, Pierre-Henri Flurin, Joseph D Zuckerman
INTRODUCTION: Osteoarthritis of the shoulder often results in significant posterior glenoid wear. The options for treating this have been eccentric glenoid reaming and occasionally bone grafting. More recently reverse total shoulder arthroplasty (rTSA) with or without bone grafting and posterior augmented glenoids (PAGs) has been introduced. The PAG restores the native joint line while reaming a minimal amount of glenoid bone. The purpose of this study is to compare osteoarthritic shoulders with significant posterior glenoid wear treated with anatomic total shoulder arthroplasty (aTSA) using a PAG to shoulders without glenoid wear treated with aTSA using a standard all poly pegged glenoid...
December 2015: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/26614800/biphasic-and-boundary-lubrication-mechanisms-in-artificial-hydrogel-cartilage-a-review
#19
REVIEW
Teruo Murakami, Seido Yarimitsu, Kazuhiro Nakashima, Nobuo Sakai, Tetsuo Yamaguchi, Yoshinori Sawae, Atsushi Suzuki
Various studies on the application of artificial hydrogel cartilage to cartilage substitutes and artificial joints have been conducted. It is expected in clinical application of artificial hydrogel cartilage that not only soft-elastohydrodynamic lubrication but biphasic, hydration, gel-film and boundary lubrication mechanisms will be effective to sustain extremely low friction and minimal wear in daily activities similar to healthy natural synovial joints with adaptive multimode lubrication. In this review article, the effectiveness of biphasic lubrication and boundary lubrication in hydrogels in thin film condition is focused in relation to the structures and properties of hydrogels...
December 2015: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/26583106/effects-of-surface-modification-and-bulk-geometry-on-the-biotribological-behavior-of-cross-linked-polyethylene-wear-testing-and-finite-element-analysis
#20
Kenichi Watanabe, Masayuki Kyomoto, Kenichi Saiga, Shuji Taketomi, Hiroshi Inui, Yuho Kadono, Yoshio Takatori, Sakae Tanaka, Kazuhiko Ishihara, Toru Moro
The wear and creep deformation resistances of polymeric orthopedic bearing materials are both important for extending their longevity. In this study, we evaluated the wear and creep deformation resistances, including backside damage, of different polyethylene (PE) materials, namely, conventional PE, cross-linked PE (CLPE), and poly(2-methacryloyloxyethyl phosphorylcholine)- (PMPC-) grafted CLPE, through wear tests and finite element analysis. The gravimetric and volumetric degrees of wear of disks (3 or 6 mm in thickness) of these materials against a cobalt-chromium-molybdenum alloy pin were examined using a multidirectional pin-on-disk tester...
2015: BioMed Research International
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