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https://www.readbyqxmd.com/read/29742232/can-low-fusing-glass-application-affect-the-marginal-misfit-and-bond-strength-of-y-tzp-crowns
#1
Monize Carelli Felipe Antunes, Jean Soares Miranda, Ronaldo Luís Almeida de Carvalho, Rodrigo Furtado de Carvalho, Estevão Tomomitsu Kimpara, Rodrigo Othávio de Assunção E Souza, Fabíola Pessôa Pereira Leite
To evaluate the effect of different surface treatments on the marginal misfit and retentive strength between Y-TZP crowns and an epoxy resin. Forty (40) epoxy resin (G10) abutments (height: 5mm, conicity: 60, finish line: large chamfer) with equal dimensions were milled and included in polyurethane to simulate the periodontal ligament. Next, 40 Y-TZP crowns (thickness: 1mm) were milled (Cerec in Lab) and randomly divided into four groups (n=10) according to the surface treatment: GS(glaze spray), GP(glaze powder/liquid), P(zirconia primer) and RS(tribochemical silica coating)...
2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29680274/suppression-of-eeg-mu-rhythm-during-action-observation-corresponds-with-subsequent-changes-in-behavior
#2
Nadav Aridan, Ori Ossmy, Batel Buaron, Daniel Reznik, Roy Mukamel
Movement is intrinsically linked to perception such that observing an action induces in the observer behavioral changes during execution of similar actions. Electroencephalogram (EEG) studies have revealed that at the group level, action observation suppresses oscillatory power in mu (8-12Hz) and beta (15-25Hz) bands over the sensorimotor cortex - a phenomenon associated with increased excitability of cortical neurons. However, it is unclear whether differences in suppression level across individuals is linked with individual differences in subsequent behavioral changes...
April 19, 2018: Brain Research
https://www.readbyqxmd.com/read/29673722/density-spectral-array-of-bis-vista%C3%A2-monitoring-system-in-a-functional-hemispherectomy
#3
C Luis, E Vilà, L Moltó, A Pardo, J L Fernández Candila, S Pacreu
We present the case of an adult patient with drug-resistant epilepsy caused by extensive inflammation in the right cerebral hemisphere. She was scheduled to undergo right functional hemispherectomy, which is common in pediatric surgery, but about which few studies have been published with respect to adult patients. During the intraoperative period, the density spectral array of the bilateral bispectral index (BIS) VISTATM monitoring system was used. We observed a power increase in low frequency (0.1-4Hz) and alpha bands (8-12Hz) in the right hemisphere, where the epileptogenic focus was...
April 16, 2018: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/29487122/the-sync-desync-model-how-a-synchronized-hippocampus-and-a-desynchronized-neocortex-code-memories
#4
George Parish, Simon Hanslmayr, Howard Bowman
Neural oscillations are important for memory formation in the brain. The desynchronization of alpha (10 Hz) oscillations in the neocortex has been shown to predict successful memory encoding and retrieval. However, when engaging in learning, it has been found that the hippocampus synchronizes in theta (4 Hz) oscillations, and that learning is dependent on the phase of theta. This inconsistency as to whether synchronization is "good" for memory formation leads to confusion over which oscillations we should expect to see and where during learning paradigm experiments...
April 4, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29330874/safety-of-high-current-stimulation-for-intermittent-intraoperative-neural-monitoring-in-thyroid-surgery-a-porcine-model
#5
I-Cheng Lu, Pi-Ying Chang, Gregory W Randolph, Hsiu-Ya Chen, Kuang-Yi Tseng, Yi-Chu Lin, Feng-Yu Chiang, Che-Wei Wu
OBJECTIVES: During monitored thyroidectomy, displacement of the recurrent laryngeal nerve (RLN) or vagus nerve (VN) in some complicated cases can increase the risk of injury. Although increasing the stimulus current can facilitate nerve mapping and localization, the safety of a high-current stimulus remains unknown. Therefore, this study evaluated the safety of a high-current stimulus in a porcine model. METHODS: Short-duration (1 minute), high-current (3, 5, 10, 15, 20, 25, and 30 mA at 4Hz) stimulus pulses were repeatedly applied to the RLN or VN in six anesthetized piglets...
January 13, 2018: Laryngoscope
https://www.readbyqxmd.com/read/29191788/progressive-impairment-of-atrial-myocyte-function-during-left-ventricular-hypertrophy-and-heart-failure
#6
Florentina Pluteanu, Yulia Nikonova, Anna Holzapfel, Birgit Herzog, Anna Scherer, Judit Preisenberger, Jelena Plačkić, Katharina Scheer, Teodora Ivanova, Alicja Bukowska, Andreas Goette, Jens Kockskämper
Hypertensive heart disease (HHD) can cause left ventricular (LV) hypertrophy and heart failure (HF). It is unclear, though, which factors may contribute to the transition from compensated LV hypertrophy to HF in HHD. We hypothesized that maladaptive atrial remodeling with impaired atrial myocyte function would occur in advanced HHD and may be associated with the emergence of HF. Experiments were performed on atrial myocytes and tissue from old (15-25months) normotensive Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR) with advanced HHD...
January 2018: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29157412/behavioral-oscillation-in-face-priming-prediction-about-face-identity-is-updated-at-a-theta-band-rhythm
#7
Yuanye Wang, Huan Luo
In order to deal with external world efficiently, the brain constantly generates predictions about incoming sensory inputs, a process known as "predictive coding." Our recent studies, by employing visual priming paradigms in combination with a time-resolved behavioral measurement, reveal that perceptual predictions about simple features (e.g., left or right orientation) return to low sensory areas not continuously but recurrently in a theta-band (3-4Hz) rhythm. However, it remains unknown whether high-level object processing is also mediated by the oscillatory mechanism and if yes at which rhythm the mechanism works...
2017: Progress in Brain Research
https://www.readbyqxmd.com/read/29084278/the-cortical-responses-to-evoked-clinical-pain-in-patients-with-hip-osteoarthritis
#8
Mikkel Gram, Joachim Erlenwein, Frank Petzke, Deborah Falla, Michael Przemeck, Miriam I Emons, Michael Reuster, Søren S Olesen, Asbjørn M Drewes
BACKGROUND: Experimental models have been used extensively to evaluate pain using e.g., visual analogue scales or electroencephalography (EEG). Stimulation using tonic pain has been shown to better mimic the unpleasantness of chronic pain, but has mainly been evoked by non-clinical stimuli. This study aims to, evaluate the EEG during clinical pain in patients scheduled for total hip replacement with control and resting conditions. METHODS: The hip scheduled for replacement was moved by the examiner to evoke pain for 30 seconds while recording EEG...
2017: PloS One
https://www.readbyqxmd.com/read/29060032/change-in-functional-networks-for-transitions-between-states-of-consciousness-during-midazolam-induced-sedation
#9
Minji Lee, Robert D Sanders, Seul-Ki Yeom, Dong-Ok Won, Hwi-Jae Kim, Bo-Ram Lee, Kwang-Suk Seo, Hyun Jeong Kim, Giulio Tononi, Seong-Whan Lee
How brain dynamics change across conscious states, including reliable signatures of the transitions between unconsciousness and consciousness, remains unclear. In this work, we addressed the changes in functional brain networks during self-titrated midazolam sedation using high-density electroencephalography (EEG) in ten subjects. We were particularly interested in the underlying network alterations, identified with graph theory, associated with transitions between states of consciousness. The weighted Phase Lag Index (wPLI) was used as the connectivity estimator between two signals...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29050860/eeg-power-spectrum-maturation-in-preterm-fetal-growth-restricted-infants
#10
Emily Cohen, Flora Y Wong, Euan M Wallace, Joanne C Mockler, Alexsandria Odoi, Samantha Hollis, Rosemary S C Horne, Stephanie R Yiallourou
Power spectral analysis of the electroencephalogram (EEG) is a non-invasive method to examine infant brain maturation. Preterm fetal growth restricted (p-FGR) neonates display an altered EEG power spectrum compared to appropriate-for-gestational-age (AGA) peers, suggesting delayed brain maturation. Longitudinal studies investigating EEG power spectrum maturation in p-FGR infants are lacking, however. We thus aimed to investigate brain maturation using sleep EEG power spectral analysis in p-FGR infants compared to preterm and term AGA controls (p-AGA and t-AGA, respectively)...
January 1, 2018: Brain Research
https://www.readbyqxmd.com/read/29049297/functional-connectivity-structure-of-cortical-calcium-dynamics-in-anesthetized-and-awake-mice
#11
Patrick W Wright, Lindsey M Brier, Adam Q Bauer, Grant A Baxter, Andrew W Kraft, Matthew D Reisman, Annie R Bice, Abraham Z Snyder, Jin-Moo Lee, Joseph P Culver
The interplay between hemodynamic-based markers of cortical activity (e.g. fMRI and optical intrinsic signal imaging), which are an indirect and relatively slow report of neural activity, and underlying synaptic electrical and metabolic activity through neurovascular coupling is a topic of ongoing research and debate. As application of resting state functional connectivity measures is extended further into topics such as brain development, aging and disease, the importance of understanding the fundamental physiological basis for functional connectivity will grow...
2017: PloS One
https://www.readbyqxmd.com/read/28982607/the-dichotomy-between-low-frequency-and-delta-waves-in-human-sleep-a-reappraisal
#12
Jean-Pol Lanquart, Pasquale Nardone, Philippe Hubain, Gwénolé Loas, Paul Linkowski
BACKGROUND: We present the results of an analysis of the low frequency (LF) (0.25-1Hz) and delta (1-4Hz) waves during human sleep. Our objective was to investigate whether LF and delta waves should be considered as separate entities. METHODS: The slow-wave electroencephalogram (EEG) activity of 2 sets of 10 young, healthy volunteers was analysed utilising the rarely-used Lomb-Scargle periodogram. This method has advantages over the more commonly-used Fast Fourier Transform analysis...
January 1, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28958482/the-individual-contribution-of-dsm-5-symptom-clusters-of-ptsd-life-events-and-childhood-adversity-to-frontal-oscillatory-brain-asymmetry-in-a-large-sample-of-active-combatants
#13
James K Moran, Anselm Crombach, Thomas Elbert, Corina Nandi, Manassé Bambonyé, Christian Wienbruch, Ursula Lommen, Roland Weierstall
Post-Traumatic Stress Disorder (PTSD) has been linked to deviations in lateralized frontal functional oscillatory activity. This is possibly because left and right DLPFC have differential roles in regulating both memory and stress response, which are both dysfunctional in PTSD. However, previous results are heterogeneous, and could be attributable to individual symptom clusters, traumatic or aggressive life events, early life stress, or the interaction of these factors. In a large sample of active combatants (N=401), we regressed these factors on frontal electroencephalography (EEG) asymmetry across 5 frequency bands (delta: 2-4Hz; theta: 4-8Hz; alpha: 8-12Hz; beta: 12-24Hz; gamma: 24-48Hz)...
October 2017: Biological Psychology
https://www.readbyqxmd.com/read/28842260/latent-binocular-function-in-amblyopia
#14
Eva Chadnova, Alexandre Reynaud, Simon Clavagnier, Robert F Hess
Recently, psychophysical studies have shown that humans with amblyopia do have binocular function that is not normally revealed due to dominant suppressive interactions under normal viewing conditions. Here we use magnetoencephalography (MEG) combined with dichoptic visual stimulation to investigate the underlying binocular function in humans with amblyopia for stimuli that, because of their temporal properties, would be expected to bypass suppressive effects and to reveal any underlying binocular function...
November 2017: Vision Research
https://www.readbyqxmd.com/read/28818339/impact-of-machining-on-the-flexural-fatigue-strength-of-glass-and-polycrystalline-cad-cam-ceramics
#15
Sara Fraga, Marina Amaral, Marco Antônio Bottino, Luiz Felipe Valandro, Cornelis Johannes Kleverlaan, Liliana Gressler May
OBJECTIVES: To assess the effect of machining on the flexural fatigue strength and on the surface roughness of different computer-aided design, computer-aided manufacturing (CAD/CAM) ceramics by comparing machined and polished after machining specimens. METHODS: Disc-shaped specimens of yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP), leucite-, and lithium disilicate-based glass ceramics were prepared by CAD/CAM machining, and divided into two groups: machining (M) and machining followed by polishing (MP)...
November 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28798149/the-utility-of-accelerometers-to-predict-stroke-rate-in-captive-fur-seals-and-sea-lions
#16
Monique A Ladds, David A Rosen, David J Slip, Robert G Harcourt
The energy expenditure of free-living fur seals and sea lions is difficult to measure directly, but may be indirectly derived from flipper stroke rate. We filmed 10 captive otariids swimming with accelerometers either attached to a harness (Daily Diary: sampling frequency 32 Hz, N=4) or taped to the fur (G6a+: 25 Hz, N=6). We used down sampling to derive four recording rates from each accelerometer (Daily Diary: 32, 16, 8, 4 Hz; G6a+: 25, 20, 10, 5 Hz). For each of these sampling frequencies, we derived 20 combinations of two parameters (RMW, the window size used to calculate the running mean; and m, the minimum number of points smaller than a local maxima used to detect a peak) from the dynamic acceleration of x, z and x+z, to estimate stroke rate from the accelerometers...
September 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28771509/combined-effect-of-prefrontal-transcranial-direct-current-stimulation-and-a-working-memory-task-on-heart-rate-variability
#17
RANDOMIZED CONTROLLED TRIAL
Stevan Nikolin, Tjeerd W Boonstra, Colleen K Loo, Donel Martin
Prefrontal cortex activity has been associated with changes to heart rate variability (HRV) via mediation of the cortico-subcortical pathways that regulate the parasympathetic and sympathetic branches of the autonomic nervous system. Changes in HRV due to altered prefrontal cortex functioning can be predicted using the neurovisceral integration model, which suggests that prefrontal hyperactivity increases parasympathetic tone and decreases contributions from the sympathetic nervous system. Working memory (WM) tasks and transcranial direct current stimulation (tDCS) have been used independently to modulate brain activity demonstrating changes to HRV in agreement with the model...
2017: PloS One
https://www.readbyqxmd.com/read/28746840/quantitative-assessments-of-extracellular-eeg-to-classify-specific-features-of-main-phases-of-seizure-acquisition-based-on-kindling-model-in-rat
#18
Mostafa Jalilifar, Ali Yadollahpour, Ahmad Ali Moazedi, Zohreh Ghotbeddin
OBJECTIVE: Quantitative assessments of extracellular EEG to identify specific features of three main phases of seizure acquisition based on kindling model in Rat. METHODS: Male rats were divided into 2 groups including kindled (n=10) and sham (n=7) and respectively underwent an amygdala rapid kindling and placebo kindling. EEG signals in stages 1-2 (initial seizure stages (ISSs)), 3 (localized seizure stage (LSS)), and 4-5 generalized seizure stages (GSSs) were divided into 5 bands: delta (0-4Hz), theta (4-8Hz), alpha (8-12Hz), beta (12-28Hz), and gamma (28-40Hz)...
July 23, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28738275/early-childhood-myoclonic-epilepsy-an-independent-genetic-generalized-epilepsy-with-myoclonic-seizures-as-the-main-seizure-type
#19
Zhixian Yang, Jiao Xue, Hui Li, Ping Qian, Xiaoyan Liu, Yuwu Jiang, Yuehua Zhang
OBJECTIVE: To elucidate the characteristics of the myoclonic seizures alone, or predominant myoclonus combined with generalized tonic-clonic seizures (GTCS) and/or absences, in early childhood, and discuss its classification. METHODS: Forty-two children were retrospectively recruited between January 2006 and June 2015. RESULTS: The mean age of seizure onset was 40.5months. They were divided into 4 groups: myoclonic seizures alone; predominant myoclonus combined with GTCS; predominant myoclonus combined with absences; predominant myoclonus combined with both GTCS and absences...
September 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28732280/evaluation-of-a-novel-median-power-spectrogram-for-seizure-detection-by-non-neurophysiologists
#20
Peter Yan, Tamar Melman, Sherry Yan, Munkhzul Otgonsuren, Zachary Grinspan
PURPOSE: (1) To evaluate how well resident physicians use a novel EEG spectral analysis tool (the median power spectrogram; MPS) to detect seizures. (2) To assess the capability of the MPS to identify different seizure types. METHODS: 120 EEG records from children with intractable seizures were converted to MPS by taking the median power across leads and using multi-taper spectral estimation. Twelve blinded neurology residents were trained to interpret the spectrogram with a five-minute video tutorial and post-test...
August 2017: Seizure: the Journal of the British Epilepsy Association
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