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https://www.readbyqxmd.com/read/27909758/release-of-fluoride-from-orthodontic-adhesives-and-penetration-into-enamel
#1
Panita Suebsureekul, Smorntree Viteporn
OBJECTIVE: The purpose of this work was to compare fluoride release from three orthodontic adhesives and fluoride penetration into the enamel surface. MATERIALS AND METHODS: A total of 156 extracted human premolar teeth were randomly assigned to three experimental groups and one control group (without bonding) with 39 teeth per group. Brackets were bonded to teeth using Fuji Ortho LC(®), Illuminate(®), or Light Bond(®). The amount of fluoride released (ppm) into artificial saliva was measured by a fluoride ion-selective electrode connected to an ion analyzer on days 1, 3, 7, and 30...
December 1, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27893396/enhanced-control-of-cortical-pyramidal-neurons-with-micro-magnetic-stimulation
#2
Seung Woo Lee, Shelley Fried
Magnetic stimulation is less sensitive to the inflammatory reactions that plague conventional electrode-based cortical implants and therefore may be useful as a next-generation (implanted) cortical prosthetic. The fields arising from micro-coils are quite small however and thus, their ability to modulate cortical activity must first be established. Here, we show that layer V pyramidal neurons (PNs) can be strongly activated by micro-coil stimulation and further, the asymmetric fields arising from such coils do not simultaneously activate horizontally -oriented axon fibers, thus confining activation to a focal region around the coil...
November 22, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27890862/randomized-blinded-and-controlled-comparative-study-of-chemical-and-radiofrequency-based-renal-denervation-in-a-porcine-model
#3
Stefan Bertog, Tim A Fischell, Félix Vega, Vartan Ghazarossian, Atul Pathak, Laura Vaskelyte, Darrin Kent, Horst Sievert, Elena Ladich, Kazuyuki Yahagi, Renu Virmani
AIMS: The blood pressure lowering effect of percutaneous renal denervation (RDN) is controversial. Success of RDN may be device-dependent. We sought to compare the efficacy of RDN by chemical neurolysis using alcohol (Peregrine System™ Infusion Catheter, Ablative Solutions, Inc. Menlo Park, CA, USA) to RDN by radiofrequency (RF) ablation with the single-electrode RF catheter (Symplicity™ Flex, Medtronic Inc., Minneapolis, MN, USA) in a porcine model. METHODS AND RESULTS: This was a prospective, randomized, blinded study...
November 29, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27878872/immobilizing-molecular-metal-dithiolene-diamine-complexes-on-2d-metal-organic-frameworks-for-electrocatalytic-h2-production
#4
Renhao Dong, Zhikun Zheng, Diana Tranca, Jian Zhang, Naisa Chandrasekhar, Shaohua Liu, Xiaodong Zhuang, Gotthard Seifert, Xinliang Feng
Carbon electrocatalysts consisting of metal complexes (such as MNx and MSx) are promising candidates for use as alternatives to high-cost Pt catalysts for the hydrogen evolution reaction (HER). However, the exact HER active sites remain elusive. Here, we selectively incorporate the molecular metal dithiolene-diamine (MS2N2, M=Co and Ni), metal bis(dithiolene) (MS4), and metal bis(diamine) (MN4) complexes into carbon-rich 2D metal-organic frameworks (2D MOFs) as model carbon electrocatalysts. The 2D MOF single layers, powders, and composites with graphene are thus prepared and devote definite active sites for H2 generation...
November 22, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27871074/comparison-of-the-hifocus-mid-scala-and-hifocus-1j-electrode-array-angular-insertion-depths-and-speech-perception-outcomes
#5
M Annerie van der Jagt, Jeroen J Briaire, Berit M Verbist, Johan H M Frijns
The HiFocus Mid-Scala (MS) electrode array has recently been introduced onto the market. This precurved design with a targeted mid-scalar intracochlear position pursues an atraumatic insertion and optimal distance for neural stimulation. In this study we prospectively examined the angular insertion depth achieved and speech perception outcomes resulting from the HiFocus MS electrode array for 6 months after implantation, and retrospectively compared these with the HiFocus 1J lateral wall electrode array. The mean angular insertion depth within the MS population (n = 96) was found at 470°...
November 21, 2016: Audiology & Neuro-otology
https://www.readbyqxmd.com/read/27858088/specific-branches-of-hypoglossal-nerve-to-genioglossus-muscle-as-a-potential-target-of-selective-neurostimulation-in-obstructive-sleep-apnea-anatomical-and-morphometric-study
#6
Philippe Delaey, Jérôme Duisit, Catherine Behets, Thierry Duprez, Pierre Gianello, Benoît Lengelé
PURPOSE: To determine the ideal implantation site for selective tongue neurostimulation in obstructive sleep apnea, anatomy of the distal branching of the hypoglossal nerve (HGN) was revisited. METHODS: The HGN distal course and intramuscular distribution to the tongue muscles were studied in 17 embalmed and 5 fresh heads (age 60-98, BMI 20-35). Medial branches supplying selectively the genioglossus (GG) muscle were identified. Then, the distinct bundles entering the oblique (GGo) and horizontal (GGh) parts of the GG were located...
November 17, 2016: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/27857299/measurement-of-the-refractive-index-of-electrically-poled-soda-lime-glass-layers-using-leaky-modes
#7
Robert Oven
Electrically poled layers have been formed in soda-lime glass using graphite electrodes in air. The refractive index and thickness of the poled glass layers have been measured by the analysis of leaky optical modes. These modes are supported by the poled layer and can be determined by analysis of the optical reflectivity measured with a prism coupler arrangement. A relatively constant refractive index of ∼1.486 in the poled glass region is measured, which is ∼0.03 below the substrate index. The reflectivity data shows that the transition between poled and unpoled glass is very sharp and is consistent with ion transport models...
November 10, 2016: Applied Optics
https://www.readbyqxmd.com/read/27849072/superstructure-zrv2o7-nanofibres-thermal-expansion-electronic-and-lithium-storage-properties
#8
Qidong Li, Yanming Zhao, Quan Kuang, Qinghua Fan, Youzhong Dong, Xudong Liu
ZrV2O7 has attracted much attention as a negative thermal expansion (NTE) material due to its isotropic negative structure. However, rarely has investigation of the lithium storage behaviors been carried out except our first report on it. Meanwhile, the electrochemical behaviors and energy storage characteristics have not been studied in depth and will be explored in this article. Herein, we report on the synthesis, characterization and lithium intercalation mechanism of superstructure ZrV2O7 nanofibres that were prepared through a facile solution-based method with a subsequent annealing process...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27825860/damage-to-inner-ear-structure-during-cochlear-implantation-correlation-between-insertion-force-and-radio-histological-findings-in-temporal-bone-specimens
#9
Daniele De Seta, Renato Torres, Francesca Yoshie Russo, Evelyne Ferrary, Guillaume Kazmitcheff, Dominique Heymann, Jerome Amiaud, Olivier Sterkers, Daniele Bernardeschi, Yann Nguyen
Cochlear implant insertion should be as least traumatic as possible in order to reduce trauma to the cochlear sensory structures. The force applied to the cochlea during array insertion should be controlled to limit insertion-related damage. The relationship between insertion force and histological traumatism remains to be demonstrated. Twelve freshly frozen cadaveric temporal bones were implanted with a long straight electrodes array through an anterior extended round window insertion using a motorized insertion tool with real-time measurement of the insertion force...
November 4, 2016: Hearing Research
https://www.readbyqxmd.com/read/27821279/differentiating-epileptic-from-non-epileptic-high-frequency-intracerebral-eeg-signals-with-measures-of-wavelet-entropy
#10
Anne H Mooij, Birgit Frauscher, Mina Amiri, Willem M Otte, Jean Gotman
OBJECTIVE: To assess whether there is a difference in the background activity in the ripple band (80-200Hz) between epileptic and non-epileptic channels, and to assess whether this difference is sufficient for their reliable separation. METHODS: We calculated mean and standard deviation of wavelet entropy in 303 non-epileptic and 334 epileptic channels from 50 patients with intracerebral depth electrodes and used these measures as predictors in a multivariable logistic regression model...
December 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27816354/invasive-epilepsy-surgery-evaluation
#11
Stjepana Kovac, Vejay N Vakharia, Catherine Scott, Beate Diehl
Intracranial EEG (iEEG) recordings are widely used for the work up of pharmacoresistant epilepsy. Different iEEG recording techniques namely subdural grids, strips, depth electrodes and stereoencephalography (SEEG) are available with distinct limitations and advantages. Epilepsy centres mastering multiple techniques apply them in an individualised patient approach. These tools are used to map the seizure onset zone which is pivotal in approximating the epileptogenic zone, i.e. the zone which is indispensable for the generation of seizures and when resected will render the patient seizure free...
October 21, 2016: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/27814851/does-leg-predomination-affect-the-measurement-of-vasti-muscle-activity-during-single-leg-squatting-a-reliability-study
#12
Javid Mostamand, Dan L Bader, Zoë Hudson
INTRODUCTION: Although measuring vasti muscle activity may reveal whether pain relief is associated with altering this parameter during functional activities in subjects with patellofemoral pain syndrome (PFPS), it may be necessary to determine whether the inherent properties of the dominant leg influences the reliability of measuring VMO/VL amplitude. The aim of the present study was to examine the effect of leg predomination on reliability testing of the VMO/VL amplitude measurement during single leg squatting in healthy subjects...
October 2016: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/27801809/comparison-of-ultrasonic-welding-and-thermal-bonding-for-the-integration-of-thin-film-metal-electrodes-in-injection-molded-polymeric-lab-on-chip-systems-for-electrochemistry
#13
Marco Matteucci, Arto Heiskanen, Kinga Zór, Jenny Emnéus, Rafael Taboryski
We compare ultrasonic welding (UW) and thermal bonding (TB) for the integration of embedded thin-film gold electrodes for electrochemical applications in injection molded (IM) microfluidic chips. The UW bonded chips showed a significantly superior electrochemical performance compared to the ones obtained using TB. Parameters such as metal thickness of electrodes, depth of electrode embedding, delivered power, and height of energy directors (for UW), as well as pressure and temperature (for TB), were systematically studied to evaluate the two bonding methods and requirements for optimal electrochemical performance...
October 27, 2016: Sensors
https://www.readbyqxmd.com/read/27788240/mechanical-flexibility-reduces-the-foreign-body-response-to-long-term-implanted-microelectrodes-in-rabbit-cortex
#14
Harbaljit S Sohal, Gavin J Clowry, Andrew Jackson, Anthony O'Neill, Stuart N Baker
Micromotion between the brain and implanted electrodes is a major contributor to the failure of invasive microelectrodes. Movements of the electrode tip cause recording instabilities while spike amplitudes decline over the weeks/months post-implantation due to glial cell activation caused by sustained mechanical trauma. We compared the glial response over a 26-96 week period following implantation in the rabbit cortex of microwires and a novel flexible electrode. Horizontal sections were used to obtain a depth profile of the radial distribution of microglia, astrocytes and neurofilament...
2016: PloS One
https://www.readbyqxmd.com/read/27786252/cortical-neurons-of-bats-respond-best-to-echoes-from-nearest-targets-when-listening-to-natural-biosonar-multi-echo-streams
#15
M Jerome Beetz, Julio C Hechavarría, Manfred Kössl
Bats orientate in darkness by listening to echoes from their biosonar calls, a behaviour known as echolocation. Recent studies showed that cortical neurons respond in a highly selective manner when stimulated with natural echolocation sequences that contain echoes from single targets. However, it remains unknown how cortical neurons process echolocation sequences containing echo information from multiple objects. In the present study, we used echolocation sequences containing echoes from three, two or one object separated in the space depth as stimuli to study neuronal activity in the bat auditory cortex...
October 27, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27784015/review-on-factors-affecting-targeting-accuracy-of-deep-brain-stimulation-electrode-implantation-between-2001-and-2015
#16
Zhe Li, Jian-Guo Zhang, Yan Ye, Xiaoping Li
BACKGROUND: Accurate implantation of a depth electrode into the brain is of the greatest importance in deep brain stimulation (DBS), and various stereotactic systems have been developed for electrode implantation. However, an updated analysis of depth electrode implantation in the modern era of DBS is lacking. OBJECTIVE: This study aims at providing an updated review on targeting accuracy of DBS electrode implantation by analyzing contemporary DBS electrode implantation operations from the perspective of precision engineering...
October 27, 2016: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/27755453/evaluation-of-rigid-cochlear-models-for-measuring-cochlear-implant-electrode-position
#17
Ahmet Cakir, Robert F Labadie, M Geraldine Zuniga, Benoit M Dawant, Jack H Noble
OBJECTIVE: To investigate the accuracy of rigid cochlear models in measuring intra-cochlear positions of cochlear implant (CI) electrodes. PATIENTS: Ninety three adults who had undergone CI and pre- and postoperative computed tomographic (CT) imaging. MAIN OUTCOME MEASURES: Seven rigid models of cochlear anatomy were constructed using micro-CTs of cochlear specimens. Using each of the seven models, the position of each electrode in each of the 98 ears in our dataset was measured as its depth along the length of the cochlea, its distance to the basilar membrane, and its distance to the modiolus...
December 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27755369/the-effect-of-scala-tympani-morphology-on-basilar-membrane-contact-with-a-straight-electrode-array-a-human-temporal-bone-study
#18
Juul Verberne, Frank Risi, Luke Campbell, Scott Chambers, Stephen O'Leary
HYPOTHESIS: Scala tympani morphology influences the insertion dynamics and intra-scalar position of straight electrode arrays. BACKGROUND: Hearing preservation is the goal of cochlear implantation with current thin straight electrode arrays. These hug the lateral wall, facilitating full, atraumatic insertions. However, most studies still report some postoperative hearing loss. This study explores the influence of scala tympani morphology on array position relative to the basilar membrane and its possible contribution to postoperative hearing loss...
November 10, 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27755356/initial-operative-experience-and-short-term-hearing-preservation-results-with-a-mid-scala-cochlear-implant-electrode-array
#19
Maja Svrakic, J Thomas Roland, Sean O McMenomey, Mario A Svirsky
OBJECTIVE: To describe our initial operative experience and hearing preservation results with the Advanced Bionics (AB) Mid Scala Electrode (MSE). STUDY DESIGN: Retrospective review. SETTING: Tertiary referral center. PATIENTS: Sixty-three MSE implants in pediatric and adult patients were compared with age- and sex-matched 1j electrode implants from the same manufacturer. All patients were severe to profoundly deaf. INTERVENTION: Cochlear implantation with either the AB 1j electrode or the AB MSE...
December 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27740707/comparative-effects-of-adaptation-on-layer-ii-iii-and-layer-v-vi-neurons-in-cat-v1
#20
Nayan Chanauria, Vishal Bharmauria, Lyes Bachatene, Sarah Cattan, Jean Rouat, Stéphane Molotchnikoff
V1 is fundamentally grouped into columns that descend from layer II-III to layer V-VI. Neurons inherent to visual cortex are capable of adapting to changes in the incoming stimuli that drive the cortical plasticity. A principle feature called orientation selectivity can be altered by the presentation of non-optimal stimulus called 'adapter'. When triggered, LGN cells impinge upon layer IV and further relay the information to deeper layers via layer II-III. Using different adaptation protocols, neuronal plasticity can be investigated...
October 14, 2016: European Journal of Neuroscience
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