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https://www.readbyqxmd.com/read/28081481/fatigue-limits-of-different-peek-materials-for-dental-implants
#1
Andreas Dominik Schwitalla, Tycho Zimmermann, Tobias Spintig, Ilona Kallage, Wolf-Dieter Müller
The increasing use of PEEK (poly-ether-ether-ketone) as a substitute for metal implant components has led to the suggestion that it could also be used as an alternative to titanium in the field of dental implants. A major requirement for dental implant materials is their resistance to cyclic loading due to mastication. A special fatigue test was designed to evaluate the elastic behavior and long-term form stability of cylindrically shaped PEEK specimens of 4, 5 and 6mm in diameter, using 11 different PEEK materials of various grades: unfilled, filled with titanium dioxide or barium sulfate powder, reinforced with short carbon fibers or short glass fibers, and reinforced with continuous carbon fibers...
December 23, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28073140/-clinical-and-radiological-results-after-anterior-cervical-corpectomy-with-cage-fusion-a-retrospective-comparison-of-peek-vs-titanium-cages
#2
Chris Schulz, Uwe Max Mauer, René Mathieu
Background Anterior cervical corpectomy and fusion (ACCF) has become a standard procedure for patients with spondylotic myelopathy due to multisegmental stenosis of the cervical canal. Beside the fusion technique using autogenous bone grafts, synthetic cages have been increasingly used in recent years. Published information on the clinical and radiological results of different cage materials for ACCF is still limited. The study presented here is the largest series to date reporting clinical and radiological outcomes and complication rates after one- to three-level ACCF using structural polyetheretherketone (PEEK) or titanium cages augmented by anterior plate-screw osteosynthesis...
January 10, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28068773/truncated-conjugate-gradient-an-optimal-strategy-for-the-analytical-evaluation-of-the-many-body-polarization-energy-and-forces-in-molecular-simulations
#3
Félix Aviat, Antoine Levitt, Benjamin Stamm, Yvon Maday, Pengyu Ren, Jay W Ponder, Louis Lagardère, Jean-Philip Piquemal
We introduce a new class of methods, denoted as Truncated Conjugate Gradient(TCG), to solve the many-body polarization energy and its associated forces in molecular simulations (i.e. molecular dynamics (MD) and Monte Carlo). The method consists in a fixed number of Conjugate Gradient (CG) iterations. TCG approaches provide a scalable solution to the polarization problem at a user-chosen cost and a corresponding optimal accuracy. The optimality of the CG-method guarantees that the number of the required matrix-vector products are reduced to a minimum compared to other iterative methods...
January 10, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28068108/transferability-and-adhesion-of-sol-gel-derived-crystalline-tio2-thin-films-to-different-types-of-plastic-substrates
#4
Natsumi Amano, Mitsuru Takahashi, Hiroaki Uchiyama, Hiromitsu Kozuka
Anatase thin films were prepared on various plastic substrates by our recently developed sol-gel transfer technique. The plastic substrates employed were polycarbonate (PC), poly(methyl methacrylate) (PMMA), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyether ether ketone (PEEK), and polyvinylidene chloride (PVDC). An Si(100) substrate was first coated with a polyimide (PI)/polyvinylpyrrolidone (PVP) mixture layer, and an alkoxide-derived titania gel film was deposited on it by spin-coating...
January 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28063640/in-situ-hydrothermal-growth-of-polyaniline-coating-for-in-tube-solid-phase-microextraction-towards-ultraviolet-filters-in-environmental-water-samples
#5
Yanan Bu, Juanjuan Feng, Xiuqin Wang, Yu Tian, Min Sun, Chuannan Luo
A facile, low cost, sensitive and environmentally friendly polyaniline (PANI) coating was prepared onto the basalt fibers (BFs) by in situ hydrothermal growth method. PANI functionalized BFs were placed into a poly(ether ether ketone) (PEEK) tube as a fibers-in-tube solid-phase microextraction (SPME) device. The extraction and analysis processes were carried out by connecting it to high performance liquid chromatography (HPLC). Three ultraviolet filters including 2-hydroxy-4-methoxybenzophenone, phenyl salicylate and 2,4-dihydroxybenzophenone were employed as model analytes...
December 29, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28062814/from-our-practices-to-yours-key-messages-for-the-journey-to-integrated-behavioral-health
#6
Stephanie B Gold, Larry A Green, C J Peek
BACKGROUND: The historic, cultural separation of primary care and behavioral health has caused the spread of integrated care to lag behind other practice transformation efforts. The Advancing Care Together study was a 3-year evaluation of how practices implemented integrated care in their local contexts; at its culmination, practice leaders ("innovators") identified lessons learned to pass on to others. METHODS: Individual feedback from innovators, key messages created by workgroups of innovators and the study team, and a synthesis of key messages from a facilitated discussion were analyzed for themes via immersion/crystallization...
January 2017: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28056835/clinical-prediction-in-defined-populations-a-simulation-study-investigating-when-and-how-to-aggregate-existing-models
#7
Glen P Martin, Mamas A Mamas, Niels Peek, Iain Buchan, Matthew Sperrin
BACKGROUND: Clinical prediction models (CPMs) are increasingly deployed to support healthcare decisions but they are derived inconsistently, in part due to limited data. An emerging alternative is to aggregate existing CPMs developed for similar settings and outcomes. This simulation study aimed to investigate the impact of between-population-heterogeneity and sample size on aggregating existing CPMs in a defined population, compared with developing a model de novo. METHODS: Simulations were designed to mimic a scenario in which multiple CPMs for a binary outcome had been derived in distinct, heterogeneous populations, with potentially different predictors available in each...
January 6, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28054628/2017-sneak-peek-what-the-new-year-holds-for-science
#8
Elizabeth Gibney
No abstract text is available yet for this article.
December 22, 2016: Nature
https://www.readbyqxmd.com/read/28046967/su-g-iep1-09-mri-evaluation-of-a-direction-modulated-brachytherapy-dmbt-tandem-applicator-for-cervical-cancer-on-3t
#9
A Soliman, D Han, A Elzibak, H Safigholi, S Mashouf, A Owrangi, A Ravi, W Song
PURPOSE: To assess image quality and artifact extent of a novel direction modulated brachytherapy (DMBT) tandem applicator on a 3T MRI using various clinical imaging sequences. METHODS: The tandem applicator is composed of a tungsten alloy with 6 peripheral grooves covered with a PEEK tip. An MR-compatible phantom with similar dimensions to the female pelvis was manufactured. To visually assess the spatial shift of the applicator's tip, a mountable radial-fiducial with 4 plastic rods, each of 3mm diameter, was designed to tightly fit on the applicator...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042444/endoscopic-management-of-the-schneiderian-membrane-perforation-during-transcrestal-sinus-augmentation-a-case-report
#10
M Andreasi Bassi, C Andrisani, S Lico, Z Ormanier, A Barlattani, L Ottria
PURPOSE: In this article the Authors describe a procedure aimed to restore under endoscopic control, the continuity, of the Schneiderian membrane (SM) incidentally teared during a sinus lift with transcrestal approach. MATERIALS E METHODS: In a 44-year-old male, due to aforementioned complication, the SM was gently detached via transcrestal approach, with a customized small ball burnisher, in order to facilitate the placement of a collagen sponge, to close the communication with the sinus, followed by the subsequent insertion of a graft material...
October 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28031502/four-level-anterior-cervical-discectomy-and-fusion-for-cervical-spondylotic-myelopathy
#11
Shan-Jin Wang, Bin Ma, Yu-Feng Huang, Fu-Min Pan, Wei-Dong Zhao, De-Sheng Wu
PURPOSE: To review the outcome of 32 consecutive patients who underwent 4-level anterior cervical discectomy and fusion (ACDF) with cages and plates and were followed up for at least 5 years. METHODS: Records of 19 men and 13 women aged 48 to 69 years who underwent 4-level ACDF with cages and plates for myelopathy (n=11) or myeloradiculopathy (n=21) at C3 to C7 by a single surgeon and were followed up for a minimum of 5 years were reviewed. Clinical outcome was assessed using the visual analogue scale (VAS), Neck Disability Index (NDI), and modified Japanese Orthopaedic Association (JOA) score for pain or myelopathic symptoms...
December 2016: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28024624/fabrication-of-hydroxyapatite-thin-films-on-polyetheretherketone-substrates-using-a-sputtering-technique
#12
K Ozeki, T Masuzawa, H Aoki
Hydroxyapatite (HA) thin films were coated on a polyetheretherketone (PEEK) substrate using a sputtering technique. A thin titanium (Ti) intermediate layer was formed between the HA and the PEEK surface to improve adhesion of the HA film to the PEEK substrate. The coated films were recrystallized using a hydrothermal treatment to reduce the dissolution of the HA film. The films were then characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and a UV-Vis spectrophotometer. A pull-out test was performed to measure the film-to-substrate adhesion strength, and an immersion test was performed in ultra-pure water...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28005736/management-of-the-repeatedly-failed-cranioplasty-following-large-postdecompressive-craniectomy-establishing-the-efficacy-of-staged-free-latissimus-dorsi-transfer-tissue-expansion-custom-polyetheretherketone-implant-reconstruction
#13
Gerhard S Mundinger, Kerry Latham, Jeffery Friedrich, Otway Louie, Hakim Said, Craig Birgfeld, Richard Ellenbogen, Richard A Hopper
BACKGROUND: Postdecompressive craniotomy defect management following failed prior cranioplastyis challenging. The authors describe a staged technique utilizing free muscle transfer, tissue expansion, and custom polyetheretherketone (PEEK) implants for the management of previously failed cranioplasty sites in patients with complicating local factors. METHODS: Consecutive patients with previously failed cranioplasties following large decompressive craniectomies underwent reconstruction of skull and soft tissue defects with staged free latissimus muscle transfer, tissue expansion, and placement of custom computer-aided design and modeling PEEK implants with a 'temporalis-plus' modification to minimize temporal hollowing...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28005168/peek-versus-titanium-locking-plates-for-proximal-humerus-fracture-fixation-a-comparative-biomechanical-study-in-two-and-three-part-fractures
#14
Benedikt Schliemann, Robert Seifert, Christina Theisen, Dominic Gehweiler, Dirk Wähnert, Martin Schulze, Michael J Raschke, Andre Weimann
INTRODUCTION: The high rigidity of metal implants may be a cause of failure after fixation of proximal humerus fractures. Carbon fiber-reinforced polyetheretherketone (PEEK) plates with a modulus similar to human cortical bone may help to overcome this problem. The present study assesses the biomechanical behavior of a PEEK plate compared with a titanium locking plate. MATERIALS AND METHODS: Unstable two- and three-part fractures were simulated in 12 pairs of cadaveric humeri and were fixed with either a PEEK or a titanium locking plate using a pairwise comparison...
December 22, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28004667/is-the-rise-in-twin-births-cresting
#15
Katie Peek
No abstract text is available yet for this article.
November 15, 2016: Scientific American
https://www.readbyqxmd.com/read/28002369/transient-local-bone-remodeling-effects-of-rhbmp-2-in-an-ovine-interbody-spine-fusion-model
#16
Hyun W Bae, Vikas V Patel, Zeeshan M Sardar, Jeffrey M Badura, Ben B Pradhan, Howard B Seim, A Simon Turner, Jeffrey M Toth
BACKGROUND: Recombinant human bone morphogenetic protein-2 (rhBMP-2) is a powerful osteoinductive morphogen capable of stimulating the migration of mesenchymal stem cells (MSCs) to the site of implantation and inducing the proliferation and differentiation of these MSCs into osteoblasts. Vertebral end-plate and vertebral body resorption has been reported after interbody fusion with high doses of rhBMP-2. In this study, we investigated the effects of 2 rhBMP-2 doses on peri-implant bone resorption and bone remodeling at 7 time points in an end-plate-sparing ovine interbody fusion model...
December 21, 2016: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28000413/bacteriostatic-behavior-of-surface-modulated-silicon-nitride-in-comparison-to-polyetheretherketone-and-titanium
#17
Ryan M Bock, Erin N Jones, Darin A Ray, B Sonny Bal, Giuseppe Pezzotti, Bryan J McEntire
Perioperative and latent infections are leading causes of revision surgery for orthopaedic devices resulting in significant increased patient care, comorbidities, and attendant costs. Identifying biomaterial surfaces that inherently resist biofilm adhesion and bacterial expression is an important emerging strategy in addressing implant-related infections. This in vitro study was designed to compare biofilm formation on three biomaterials commonly employed in spinal fusion surgery - silicon nitride (Si3 N4 ), polyetheretherketone (PEEK), and a titanium alloy (Ti6Al4V-ELI) - using one gram-positive and one gram-negative bacterial species...
December 21, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27992878/aromatic-and-antiaromatic-ring-currents-in-a-molecular-nanoring
#18
Martin D Peeks, Timothy D W Claridge, Harry L Anderson
Aromatic and antiaromatic molecules-which have delocalized circuits of [4n + 2] or [4n] electrons, respectively-exhibit ring currents around their perimeters. The direction of the ring current in an aromatic molecule is such as to generate a magnetic field that opposes the external field inside the ring (a 'diatropic' current), while the ring current in an antiaromatic molecule flows in the reverse direction ('paratropic'). Similar persistent currents occur in metal or semiconductor rings, when the phase coherence of the electronic wavefunction is preserved around the ring...
December 19, 2016: Nature
https://www.readbyqxmd.com/read/27989984/anterior-cervical-discectomy-and-fusion-comparison-of-fusion-dysphagia-and-complication-rates-between-recombinant-human-bone-morphogenetic-protein-2-and-beta-tricalcium-phosphate
#19
Brendan P Lovasik, Christopher M Holland, Brian M Howard, Griffin R Baum, Gerald E Rodts, Daniel Refai
INTRODUCTION: Anterior cervical discectomy and fusion (ACDF) is one of the most common spinal procedures performed. A direct comparison of the fusion and complication rates between recombinant human bone morphogenetic protein-2 (rhBMP2) and beta-tricalcium phosphate (bTCP) has not been reported. METHODS: A retrospective study of 191 consecutive patients who underwent ACDF with PEEK (poly-ether-ether ketone plastic) fusion spacers over a 2-year period with either rhBMP2 (n=84, 46%) or bTCP (n=107, 56) was performed...
October 27, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27987780/collagen-glycosaminoglycan-coatings-enhance-new-bone-formation-in-a-critical-size-bone-defect-a-pilot-study-in-rats
#20
Yvonne Förster, Ricardo Bernhardt, Vera Hintze, Stephanie Möller, Matthias Schnabelrauch, Dieter Scharnweber, Stefan Rammelt
Bone regeneration in critical size bone defects still represents an important but unsolved clinical problem. Glycosaminoglycans (GAGs) like chondroitin sulfate (CS) or hyaluronan (HA) are important multifunctional components of the extracellular matrix (ECM) in bone and may stimulate bone healing by recruitment of mesenchymal stromal cells and by supporting their differentiation. Sulfation of GAGs affects their biological activity and thus their interactions with growth factors and/or cells involved in the bone healing process...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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