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Elastomerics

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https://www.readbyqxmd.com/read/28208993/preliminary-sem-observations-on-the-surface-of-elastomeric-impression-materials-after-immersion-or-ozone-disinfection
#1
Nikolas Poulis, Anthony Prombonas, Stavros Yannikakis, Thanasis Karampotsos, Martha-Spyridoula Katsarou, Nikolaos Drakoulis
INTRODUCTION: Surface integrity of dental elastomeric impression materials that are subjected to disinfection is of major importance for the quality of the final prosthetic restorations. AIM: The aim of this qualitative Scanning Electronic Microscopy (SEM) study was to reveal the effects of immersion or ozone disinfection on the surface of four dental elastomeric impression materials. MATERIALS AND METHODS: Four dental elastomeric impression material brands were used (two vinyl polysiloxane silicones, one polyether, and one vinyl polyether silicone)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28198812/highly-stretchable-and-shape-controllable-three-dimensional-antenna-fabricated-by-cut-transfer-release-method
#2
Zhuocheng Yan, Taisong Pan, Guang Yao, Feiyi Liao, Zhenlong Huang, Hulin Zhang, Min Gao, Yin Zhang, Yuan Lin
Recent progresses on the Kirigami-inspired method provide a new idea to assemble three-dimensional (3D) functional structures with conventional materials by releasing the prestrained elastomeric substrates. In this paper, highly stretchable serpentine-like antenna is fabricated by a simple and quick "Cut-Transfer-Release" method for assembling stretchable 3D functional structures on an elastomeric substrate with a controlled shape. The mechanical reliability of the serpentine-like 3D stretchable antenna is evaluated by the finite element method and experiments...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195075/stretchable-array-of-metal-nanodisks-on-a-3d-sinusoidal-wavy-elastomeric-substrate-for-frequency-tunable-plasmonics
#3
Di Feng, Hui Zhang, Siyi Xu, Limei Tian, Ningfang Song
Metal nanostructures integrated with soft, elastomeric substrates provide an unusual platform with capabilities in plasmonic frequency tuning of mechanical strain. In this paper, we have prepared a tunable optical device, dense arrays of plasmonic nanodisks on a low-modulus, and high-elongation elastomeric substrate with a three-dimensional (3D) sinusoidal wavy, and their optical characteristics have been measured and analyzed in detail. Since surface plasmon is located and propagates along metal surfaces with sub-wavelength structures, and those dispersive properties are determined by the coupling strength between the individual structures, in this study, a 3D sinusoidal curve elastomeric substrate is used to mechanically control the inter-nanodisk spacing by applying straining and creating a frequency tunable plasmonic device...
February 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28183051/expression-crosslinking-and-developing-modulus-master-curves-of-recombinant-resilin
#4
Md Shahriar K Khandaker, Daniel M Dudek, Eric P Beers, David A Dillard
Resilin is a disordered elastomeric protein found in specialized regions of insect cuticles, where low stiffness and high resilience are required. Having a wide range of functions that vary among insect species, resilin operates across a wide frequency range, from 5Hz for locomotion to 13kHz for sound production. We synthesize and crosslink a recombinant resilin from clone-1 (exon-1+exon-2) of the gene, and determine the water content (approximately 80wt%) and dynamic mechanical properties, along with estimating surface energies relevant for adhesion...
January 11, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28179545/a-sterilizable-biocompatible-tropoelastin-surface-coating-immobilized-by-energetic-ion-activation
#5
Giselle C Yeo, Alexey Kondyurin, Elena Kosobrodova, Anthony S Weiss, Marcela M M Bilek
Biomimetic materials which integrate with surrounding tissues and regulate new tissue formation are attractive for tissue engineering and regenerative medicine. Plasma immersion ion-implanted (PIII) polyethersulfone (PES) provides an excellent platform for the irreversible immobilization of bioactive proteins and peptides. PIII treatment significantly improves PES wettability and results in the formation of acidic groups on the PES surface, with the highest concentration observed at 40-80 s of PIII treatment...
February 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28177575/surface-coating-of-gypsum-based-molds-for-maxillofacial-prosthetic-silicone-elastomeric-material-evaluating-different-microbial-adhesion
#6
Salah Khalaf, Zaihan Ariffin, Adam Husein, Fazal Reza
PURPOSE: To compare the adhesion of three microorganisms on modified and unmodified silicone elastomer surfaces with different surface roughnesses and porosities. MATERIALS AND METHODS: Candida albicans, Streptococcus mutans, and Staphylococcus aureus were incubated with modified and unmodified silicone groups (N = 35) for 30 days at 37°C. The counts of viable microorganisms in the accumulating biofilm layer were determined and converted to cfu/cm(2) unit surface area...
February 8, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28174366/radiofrequency-glow-discharge-as-a-mode-of-disinfection-for-elastomeric-impression-materials
#7
Susan Mathew, Mathew M Alani, K N Velayudhan Nair, Sayij Haridas, P B Reba, Sherin A Thomas
INTRODUCTION: Prosthodontic practice involves procedures in which impressions of the maxillary and mandibular arches are mandatory. Cross infection is one of the major problems that can occur in regular dental practice. Every dentist should take utmost care to prevent cross infection as oral cavity is the source of variety of microorganisms which can often cause diseases that can be fatal. Although precautions, such as wearing of gloves and mask, sterilization of instruments are given importance, the need for disinfection of impressions is often neglected...
February 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28165584/triblock-copolymers-based-on-%C3%AE%C2%B5-caprolactone-and-trimethylene-carbonate-for-the-3d-printing-of-tissue-engineering-scaffolds
#8
Aysun Güney, Jos Malda, Wouter J A Dhert, Dirk W Grijpma
BACKGROUND: Biodegradable PCL-b-PTMC-b-PCL triblock copolymers based on trimethylene carbonate (TMC) and ε-caprolactone (CL) were prepared and used in the 3D printing of tissue engineering scaffolds. Triblock copolymers of various molecular weights containing equal amounts of TMC and CL were prepared. These block copolymers combine the low glass transition temperature of amorphous PTMC (approximately -20°C) and the semi-crystallinity of PCL (glass transition approximately -60°C and melting temperature approximately 60°C)...
February 1, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28164256/torque-differences-due-to-the-material-variation-of-the-orthodontic-appliance-a-finite-element-study
#9
Spyridon N Papageorgiou, Ludger Keilig, Vaska Vandevska-Radunovic, Theodore Eliades, Christoph Bourauel
BACKGROUND: Torque of the maxillary incisors is crucial to occlusal relationship and esthetics and can be influenced by many factors. The aim of this study was to assess the relative influence of the material of the orthodontic appliance (adhesive, bracket, ligature, and wire) on tooth displacements and developed stresses/strains after torque application. METHODS: A three-dimensional upper right central incisor with its periodontal ligament (PDL) and alveolus was modeled...
December 2017: Progress in Orthodontics
https://www.readbyqxmd.com/read/28164206/influence-of-fluid-viscosity-and-wetting-on-multiscale-viscoelastic-lubrication-in-soft-tribological-contacts
#10
Nichola Selway, Vincent Chan, Jason R Stokes
Friction (and lubrication) between soft contacts is prevalent in many natural and engineered systems and plays a crucial role in determining their functionality. The contribution of viscoelastic hysteresis losses to friction in these systems has been well-established and defined for dry contacts; however, the influence of fluid viscosity and wetting on these components of friction has largely been overlooked. We provide systematic experimental evidence of the influence of lubricant viscosity and wetting on lubrication across multiple regimes within a viscoelastic contact...
February 6, 2017: Soft Matter
https://www.readbyqxmd.com/read/28158637/antibiotic-stability-related-to-temperature-variations-in-elastomeric-pumps-used-for-outpatient-parenteral-antimicrobial-therapy-opat
#11
Rachel Voumard, Niklas Van Neyghem, Camille Cochet, Céline Gardiol, Laurent Decosterd, Thierry Buclin, Serge de Valliere
No abstract text is available yet for this article.
February 3, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28155936/highly-transparent-agnw-pdms-stretchable-electrodes-for-elastomeric-electrochromic-devices
#12
Huan-Shen Liu, Bo-Cheng Pan, Guey-Sheng Liou
Stretchable conductors based on silver nanowires (AgNWs) and polydimethylsiloxane (PDMS) have been studied extensively for many years. However, it is still difficult to achieve high transparency with low resistance due to the low attractive force between AgNWs and PDMS. In this paper, we report an effective method to transfer AgNWs into PDMS by using substrates which have a hydrophobic surface, and successfully prepared stretchable AgNW/PDMS electrodes having high transparency and low sheet resistance at the same time...
February 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28150829/one-step-micromolding-of-complex-3d-microchambers-for-single-cell-analysis
#13
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/28146148/anisotropically-organized-three-dimensional-culture-platform-for-reconstruction-of-a-hippocampal-neural-network
#14
So Hyun Kim, Sun-Kyoung Im, Soo-Jin Oh, Sohyeon Jeong, Eui-Sung Yoon, C Justin Lee, Nakwon Choi, Eun-Mi Hur
In native tissues, cellular and acellular components are anisotropically organized and often aligned in specific directions, providing structural and mechanical properties for actuating biological functions. Thus, engineering alignment not only allows for emulation of native tissue structures but might also enable implementation of specific functionalities. However, achieving desired alignment is challenging, especially in three-dimensional constructs. By exploiting the elastomeric property of polydimethylsiloxane and fibrillogenesis kinetics of collagen, here we introduce a simple yet effective method to assemble and align fibrous structures in a multi-modular three-dimensional conglomerate...
February 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/28135189/direct-measurement-of-trpv4-and-piezo1-activity-reveals-multiple-mechanotransduction-pathways-in-chondrocytes
#15
M Rocio Servin-Vences, Mirko Moroni, Gary R Lewin, Kate Poole
The joints of mammals are lined with cartilage, comprised of individual chondrocytes embedded in a specialized extracellular matrix. Chondrocytes experience a complex mechanical environment and respond to changing mechanical loads in order to maintain cartilage homeostasis. It has been proposed that mechanically gated ion channels are of functional importance in chondrocyte mechanotransduction; however, direct evidence of mechanical current activation in these cells has been lacking. We have used high-speed pressure clamp and elastomeric pillar arrays to apply distinct mechanical stimuli to primary murine chondrocytes, stretch of the membrane and deflection of cell-substrate contacts points, respectively...
January 30, 2017: ELife
https://www.readbyqxmd.com/read/28110067/poly-glycerol-sebacate-elastomer-supports-bone-regeneration-by-its-mechanical-properties-being-closer-to-osteoid-tissue-rather-than-to-mature-bone
#16
S H Zaky, K W Lee, J Gao, A Jensen, K Verdelis, Y Wang, A J Almarza, C Sfeir
: Mechanical load influences bone structure and mass. Arguing the importance of load-transduction, we investigated the mechanisms inducing bone formation using an elastomeric substrate. We characterized Poly (glycerol sebacate) (PGS) in-vitro for its mechanical properties, compatibility with osteoprogenitor cells regarding adhesion, proliferation, differentiation under compression versus static cultures and in-vivo for the regeneration of a rabbit ulna critical size defect. The load-transducing properties of PGS were compared in-vitro to a stiffer poly lactic-co- glycolic-acid (PLA/PGA) scaffold of similar porosity and interconnectivity...
January 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28104370/unusual-reversible-elastomeric-gels-from-nostoc-commune
#17
Sol Rodriguez, Karen N Gonzales, Eduardo G Romero, Omar P Troncoso, Fernando G Torres
Nostoc commune cyanobacteria grow in extreme conditions of desiccation and nutrient-poor soils. Their colonies form spherical gelatinous bodies are composed of a variety of polysaccharides that allow them to store water and nutrients. In this paper, we study this type of biological gel that shows characteristics of both chemical and physical gels. The structure of this gel was assessed by means of scanning electron microscopy, plate-plate rheometry, Fourier transform infrared spectroscopy and absorption/desorption tests...
April 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28094912/strong-strain-sensing-performance-of-natural-rubber-nanocomposites
#18
Tamil Selvan Natarajan, Subramani Bhagavatheswaran Eshwaran, Klaus Werner Stöckelhuber, Sven Wießner, Petra Pötschke, Gert Heinrich, Amit Das
A detail study concerning the strain (tensile) dependent electrical conductivity of elastomeric composites is reported in this present paper. Multiwall carbon nanotubes (CNT), conducting carbon black (CB), and their combinations were considered as conducting filler in cross-linked natural rubber matrix. The loadings of the fillers were considered from 3 to 11 phr (filler concentration close to their percolation threshold). Without hindering the elastic nature of the composite (reversible stretchability up to several 100%), the change of relative resistance, ΔR/R0 (ΔR is the change in the resistance with respect to strain and R0 is the initial resistance of the sample) of the CB filled composites was found to be as much as ∼1300 at around 120% elongation...
January 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28089335/intrusion-of-maxillary-molar-using-mini-implants-a-clinical-report-and-follow-up-at-5-years
#19
Célia Regina Maio Pinzan-Vercelino, Fausto Silva Bramante, Júlio de Araújo Gurgel, Eliane Cristina Carrera Eleres Vergani, Rosyane de Souza Gregório
This clinical report describes a straightforward alternative treatment for adult patients with extruded maxillary molars, who are reluctant to use fixed appliances and complex mechanics. The maxillary molar supereruption of a 57-year-old woman was treated using buttons bonded to the buccal and palatal surfaces of the molars, 2 mini-implants, and elastomeric chains. The intrusion was achieved in 5 months. The treatment stability was observed for 5 years after treatment.
January 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28087135/surgical-site-infection-related-to-use-of-elastomeric-pumps-in-pectus-excavatum-repair-lessons-learned-from-root-cause-analysis
#20
Nadja Apelt, Joshua Schaffzin, Christina Bates, Rebeccah L Brown, Marc Mecoli, Senthilkumar Sadhasivam, Victor Garcia
BACKGROUND: Pectus excavatum repair (PEX) is among the most painful thoracic procedures performed. Continuous peripheral nerve blockade (CPNB) is known to be efficacious in optimizing pain control while limiting narcotic use in adult thoracic procedures. It was introduced in May 2015 as a bridge to oral pain control in children undergoing PEX. Consequently, the surgical site infection (SSI) rate increased from 2.7% to 27.7%. METHODS: SSI surveillance followed national guidelines...
January 6, 2017: Journal of Pediatric Surgery
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