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https://www.readbyqxmd.com/read/29041068/relativistic-electron-acceleration-by-mj-class-khz-lasers-normally-incident-on-liquid-targets
#1
Scott Feister, Drake R Austin, John T Morrison, Kyle D Frische, Chris Orban, Gregory Ngirmang, Abraham Handler, Joseph R H Smith, Mark Schillaci, Jay A LaVerne, Enam A Chowdhury, R R Freeman, W M Roquemore
We report observation of kHz-pulsed-laser-accelerated electron energies up to 3 MeV in the -klaser (backward) direction from a 3 mJ laser interacting at normal incidence with a solid density, flowing-liquid target. The electrons/MeV/s.r. >1 MeV recorded here using a mJ-class laser exceeds or equals that of prior super-ponderomotive electron studies employing lasers at lower repetition-rates and oblique incidence. Focal intensity of the 40-fs-duration laser is 1.5 · 10(18) W cm(-2), corresponding to only ∼80 keV electron ponderomotive energy...
August 7, 2017: Optics Express
https://www.readbyqxmd.com/read/29039078/the-neuroprotective-effects-of-hydro-alcoholic-extract-of-olive-olea-europaea-l-leaf-on-rotenone-induced-parkinson-s-disease-in-rat
#2
Maryam Sarbishegi, Enam Alhagh Charkhat Gorgich, Ozra Khajavi, Gholamreza Komeili, Saeedeh Salimi
Parkinson's disease (PD) is an age-related disease in which dopaminergic neurons in the nigrostriatal pathway are destroyed, resulting in movement and behavioral problems. Oxidative stress and the generation of reactive oxygen species play key roles in neurodegenerative diseases, such as PD. Rotenone (ROT) is a common pesticide that induces oxidative stress. Olive leaves extract (OLE) has antioxidant and neuroprotective effects. Thus, the aim of this study was to investigate the neuroprotective effects of OLE on ROT-induced oxidative stress in the midbrain of a rat model of PD...
October 16, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29026663/ependymal-enhancement-on-magnetic-resonance-imaging-for-the-identification-of-high-grade-gliomas
#3
Muhammad Waqas, Muzna Iftikhar, Usman T Siddiqui, Syed Ather Enam
BACKGROUND: High-grade gliomas have high infiltrative potential and spread along white matter and blood vessels. Enhancement of ependymal lining on magnetic resonance imaging (MRI) is considered as a marker of parenchymal spread of disease. In this study, we aimed to assess the sensitivity, specificity, and positive and negative predictive values of ependymal enhancement (EE) for identification of high-grade glial tumors. METHODS: We reviewed preoperative MRI scans of 94 consecutive patients surgically treated for space occupying lesions of the brain for EE...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28983534/from-orthodontic-treatment-plan-to-ultrathin-no-prep-cad-cam-temporary-veneers
#4
Stefano Patroni, Renato Cocconi
Several treatment options are described in the literature to solve the microdontia-related problems of maxillary anterior teeth. These options are often focused on an orthodontic rather than a restorative approach. The case presented here started with an orthodontic phase followed by a restorative one. The aim of the orthodontic phase was to achieve the correct spacing, respecting ideal average tooth proportions. This was done using a digital setup to restore the six anterior teeth, so that an optimal esthetic and functional result was achieved by the end of the orthodontic treatment...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28966821/self-resolving-prepontine-cyst
#5
Muhammad Waqas, Inamullah Khan, Reehana Khawaja, Ayesha Quddusi, Syed Ather Enam
BACKGROUND: Intracranial prepontine cysts are rare and include epidermoid cysts, arachnoid cysts, and neurenteric cysts. Symptomatic prepontine cysts may require surgical intervention. Reports of spontaneous resolution of cysts are rare. CASE DESCRIPTION: We describe the case of a young gentleman who presented with headache and fever. Magnetic resonance imaging of the brain identified a prepontine lesion with features consistent with epidermoid cyst. During admission, the patient received symptomatic management in addition to empirical antibiotic therapy and dexamethasone...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28957187/high-order-harmonic-generations-in-intense-mir-fields-by-cascade-three-wave-mixing-in-a-fractal-poled-linbo3-photonic-crystal
#6
Hyunwook Park, Antoine Camper, Kyle Kafka, Boqin Ma, Yu Hang Lai, Cosmin Blaga, Pierre Agostini, Louis F DiMauro, Enam Chowdhury
We report on the generation of harmonic-like photon upconversion in a LiNbO3-based nonlinear photonic crystal by mid-infrared (MIR) femtosecond laser pulses. We study below bandgap harmonics of various driver wavelengths, reaching up to the 11th order at 4 μm driver with 13% efficiency. We compare our results to numerical simulations based on two mechanisms: cascade three-wave mixing and non-perturbative harmonic generation, both of which include quasi-phase matching. The cascade model reproduces well the general features of the observed spectrum, including a plateau-like harmonic distribution and the observed efficiency...
October 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28941585/a-comparative-study-on-the-wear-behavior-of-a-polymer-infiltrated-ceramic-network-picn-material-and-tooth-enamel
#7
Zhou Xu, Ping Yu, Dwayne D Arola, Jie Min, Shanshan Gao
OBJECTIVE: To investigate the wear mechanisms of a polymer infiltrated ceramic network (PICN) material, to compare its wear behavior with that of tooth enamel, and to provide evidence relevant to its clinical use. METHODS: The Vickers hardness (HV) and elastic modulus (E) of a commercial PICN material (ENAMIC) and enamel were measured. Reciprocating wear tests were performed under a ball-on-flat configuration. Three wear pairs were explored including ENAMIC and enamel subjected to Si3N4 ball antagonists and ENAMIC subjected to enamel cusp antagonists...
September 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28919563/reading-between-the-joints-using-spinal-mri-for-the-evaluation-of-instability
#8
Komal Naeem, Syed Ather Enam
No abstract text is available yet for this article.
September 14, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28913890/interfacial-fracture-toughness-of-adhesive-resin-cement-lithium-disilicate-resin-composite-blocks
#9
Samer Mesmar, N Dorin Ruse
PURPOSE: Resin composite blocks (RCB) are advocated as alternative to ceramic blocks (CB). Prior to use, adherence to these materials should characterized. This study aimed to test the null hypothesis (H0 ) that material and surface treatment combinations do not influence interfacial fracture toughness (KIC ) of a self-cured adhesive resin cement [RelyX Ultimate (RXU)] to RCB or CB, under nonaged and aged conditions. MATERIALS AND METHODS: Two RCB, Lava Ultimate (LU) and Enamic (EN), and one CB, IPS e...
September 15, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28892655/bonding-to-cad-cam-composites-an-interfacial-fracture-toughness-approach
#10
M Eldafrawy, M G Ebroin, P A Gailly, J-F Nguyen, M J Sadoun, A K Mainjot
The objective of this study was to evaluate the interfacial fracture toughness (IFT) of composite cement with dispersed filler (DF) versus polymer-infiltrated ceramic network (PICN) computer-aided design and computer-aided manufacturing (CAD-CAM) composite blocks after 2 different surface pretreatments using the notchless triangular prism (NTP) test. Two DFs (Cerasmart [CRT] and Lava Ultimate [LVA]), 2 PICNs (Enamic [ENA] and experimental PICN [EXP]), and e.max CAD lithium disilicate glass-ceramic (EMX, control) prism samples were bonded to their counterparts with Variolink Esthetic DC composite cement after either hydrofluoric acid etching (HF) or gritblasting (GR)...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28891600/the-effect-of-milling-and-postmilling-procedures-on-the-surface-roughness-of-cad-cam-materials
#11
Eduardo Gonçalves Mota, Laura Nunes Smidt, Lisiane Martins Fracasso, Luiz Henrique Burnett, Ana Maria Spohr
PURPOSE: The aim of this study was to evaluate the surface roughness and analyze the surface topography of five different CAD/CAM ceramics and one CAD/CAM composite resin for CEREC after milling and postmilling procedures. MATERIALS AND METHODS: Blocks of the ceramics Mark II, IPS Empress CAD, IPS e.max CAD, Suprinity and Enamic, and blocks of the composite resin Lava Ultimate were milled at CEREC MCXL. Ten flat samples of each material were obtained. The surface roughness (Ra) test was performed before and after milling, crystallization, polishing, and glaze when indicated, followed by SEM and AFM analysis...
September 11, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28835598/influence-of-material-thickness-on-fractural-strength-of-cad-cam-fabricated-ceramic-crowns
#12
Moritz Zimmermann, Gustav Egli, Markus Zaruba, Albert Mehl
The fracture behavior of CAD/CAM fabricated crowns was investigated as a function of material thickness for six silicate ceramic materials: Mark II, e.max CAD, Celtra Duo milled, Celtra Duo fired, Suprinity, Enamic. Crowns with thicknesses 0.5/1.0/1.5 mm were fabricated with CEREC and adhesively seated to dies fabricated with stereolithography technology (n=144). Thermomechanical loading and fractural loading was performed. Statistical analysis was done with one-way ANOVA and post-hoc Scheffé test. For 1.5 mm, all crowns survived fatigue testing, for 1...
August 24, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28806259/serendipitous-discovery-of-isolated-gastric-metastases-from-adenocarcinoma-of-the-lung-on-staging-18f-fdg-pet-ct
#13
Punit Sharma, Amit Dutt Dwary, Enam Murshed Khan
Gastric metastasis from lung cancer is rare. We here present the case of a 59-year-old man with lung adenocarcinoma where isolated gastric metastases were discovered on staging F-FDG PET-CT, confirmed with endoscopy and biopsy.
October 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28804719/effect-of-2-bleaching-agents-with-a-content-of-high-concentrated-hydrogen-peroxide-on-stained-2-cad-cam-blocks-and-a-nanohybrid-composite-resin-an-afm-evaluation
#14
İzgen Karakaya, Esra Cengiz
The aim of this study was to evaluate color stability of 3 restorative materials, discoloration ability of different solutions, efficacy of 2 office bleaching agents, and surface roughness and topography. Sixty specimens for Clearfil Majesty Esthetic (CME), Lava Ultimate (LU), and Vita Enamic (VE) were prepared. They were immersed into 3 staining solutions for 2 weeks and then they were bleached. According to the measured L(⁎), a(⁎), and b(⁎) parameters described by CIELAB system, color changes (ΔE00), translucency parameters (TP), whiteness index values (W(⁎)), and changes in closeness to pure white (ΔW(⁎)) were calculated...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28781072/mechanical-and-optical-properties-of-monolithic-cad-cam-restorative-materials
#15
Nazmiye Sen, Yesim Olcer Us
STATEMENT OF PROBLEM: Achieving natural tooth appearance with sufficient mechanical strength is one of the most challenging issues of computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials. However, limited evidence is available regarding their optical and mechanical properties for proper and evidence-based material selection in clinical practice. PURPOSE: The purpose of this in vitro study was to assess and compare the translucency and biaxial flexural strength of 5 monolithic CAD-CAM restorative materials...
August 4, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28772602/wear-behavior-of-ceramic-cad-cam-crowns-and-natural-antagonists
#16
Ella A Naumova, Stephan Schneider, Wolfgang H Arnold, Andree Piwowarczyk
OBJECTIVE: Evaluation of wear behavior of computer-aided design/computer-aided manufacturing (CAD/CAM) crowns from various restorative materials and natural antagonists. METHOD: Full CAD/CAM crowns fabricated with nanoceramic resin (Lava Ultimate (LU)), a glass ceramic in a resin interpenetrating matrix (Vita Enamic (VE)) and a lithium silicate reinforced ceramic enriched with zirconia (Vita Suprinity (VS)) were cemented on human molars. The crown and antagonists were subjected to simulated chewing...
February 28, 2017: Materials
https://www.readbyqxmd.com/read/28727998/enrichment-of-endogenous-fractalkine-and-anti-inflammatory-cells-via-aptamer-functionalized-hydrogels
#17
Syed Faaiz Enam, Jack R Krieger, Tarun Saxena, Brian E Watts, Claire E Olingy, Edward A Botchwey, Ravi V Bellamkonda
Early recruitment of non-classical monocytes and their macrophage derivatives is associated with augmented tissue repair and improved integration of biomaterial constructs. A promising therapeutic approach to recruit these subpopulations is by elevating local concentrations of chemoattractants such as fractalkine (FKN, CX3CL1). However, delivering recombinant or purified proteins is not ideal due to their short half-lives, suboptimal efficacy, immunogenic potential, batch variabilities, and cost. Here we report an approach to enrich endogenous FKN, obviating the need for delivery of exogenous proteins...
October 2017: Biomaterials
https://www.readbyqxmd.com/read/28689915/a-3-year-clinical-evaluation-of-endodontically-treated-posterior-teeth-restored-with-two-different-materials-using-the-cerec-ac-chair-side-system
#18
Ting Lu, Ling Peng, Fu Xiong, Xiao-Yu Lin, Ping Zhang, Zhi-Ting Lin, Bu-Ling Wu
STATEMENT OF PROBLEM: The introduction of polymer-infiltrated ceramic network (PICN) materials may provide more options for dentists in restoring short clinical crowns and extensively damaged posterior teeth, but clinical data for their performance are lacking. PURPOSE: The purpose of this clinical study was to compare the 3-year performance and survival rates of PICN material with those of conservative ceramic onlay restorations for endodontically treated posterior teeth using the CEREC AC chair-side system...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28665295/broadband-monochromatic-and-quasi-monochromatic-x-ray-propagation-in-multi-z-media-for-imaging-and-diagnostics
#19
Maximillian Westphal, Sara N Lim, Sultana N Nahar, Enam Chowdhury, Anil Kumar Pradhan
With the advent of monochromatic and quasi-monochromatic x-ray sources, we explore their potential with computational and experimental studies on propagation through a combination of low and high-Z (atomic number) media for applications to imaging and detection. The multi-purpose code GEANT4 and a new code PHOTX are employed in numerical simulations, and a variety of x-ray sources are considered: conventional broadband devices with well-known spectra, quasi-monochromatic laser driven sources, and monochromatic synchrotron x-rays...
June 30, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28651905/self-etching-ceramic-primer-versus-hydrofluoric-acid-etching-etching-efficacy-and-bonding-performance
#20
Hatem M El-Damanhoury, Maria D Gaintantzopoulou
AIM: This study assessed the effect of pretreatment of hybrid and glass ceramics using a self-etching primer on the shear bond strength (SBS) and surface topography, in comparison to pretreatment with hydrofluoric acid and silane. METHODS: 40 rectangular discs from each ceramic material (IPS e.max CAD;EM, Vita Mark II;VM, Vita Enamic;VE), were equally divided (n=10) and assigned to one of four surface pretreatment methods; etching with 4.8% hydrofluoric acid followed by Monobond plus (HFMP), Monobond etch & prime (Ivoclar Vivadent) (MEP), No treatment (NT) as negative control and Monobond plus (Ivoclar Vivadent) with no etching (MP) as positive control...
June 23, 2017: Journal of Prosthodontic Research
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