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https://www.readbyqxmd.com/read/29629327/fracture-resistance-of-ceramic-crowns-supported-with-indirect-chair-side-composite-cores
#1
Khalid M Abdelaziz, Cinderella K Keshk, Abdulkhaliq Alshadidi, Salman Mafraq, David F Murchison
Aims and Objectives: To evaluate the influence of indirect chair-side polymerization of resin composite cores on the fracture resistance of overlaying IPS e.max Press crowns. Materials and Methods: Root canals of 60 extracted premolars were prepared to receive #2 fiber posts after the crowns were sectioned 2 mm above the cervical line. In Groups 1-3 ( n = 10 each), posts were luted to the prepared dowel spaces using self-adhesive resin cement. Resin composite cores were then bonded and incrementally built-up using Filtek Z250 XT, Filtek P60, and Filtek P90 resin composites...
January 2018: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/29628623/magnetic-field-induced-dielectric-behaviors-and-magneto-electrical-coupling-of-multiferroic-compounds-containing-cobalt-ferrite-barium-calcium-titanate-composite-fibers
#2
Deqing Zhang, Junye Cheng, Jixing Chai, Jiji Deng, Ran Ren, Yang Su, Hao Wang, Chunqing Ma, Chun-Sing Lee, Wenjun Zhang, Guang-Ping Zheng, Maosheng Cao
Multiferroics have broad application prospects in various fields such as multi-layer ceramic capacitors and multifunctional devices owing to their high dielectric constants and coupled magnetic and ferroelectric properties at room temperature. In this study, cobalt ferrite (CFO)/barium calcium titanate (BCT) composite fibers are prepared from BCT and CFO sols by an electrospinning method, and are then oriented by magnetic fields and sintered at high temperatures. The effects of magnetic fields and CFO contents on the nanostructures and magnetoelectric properties of the composites are investigated...
April 5, 2018: Journal of Alloys and Compounds
https://www.readbyqxmd.com/read/29604003/study-on-vibration-sensing-performance-of-an-equal-strength-cantilever-beam-based-on-an-excessively-tilted-fiber-grating
#3
Binbin Luo, Wanmeng Yang, Xinyu Hu, Huafeng Lu, Shenghui Shi, Mingfu Zhao, Ye Lu, Lang Xie, Zhongyuan Sun, Lin Zhang
An equal strength cantilever beam vibration sensor based on an excessively tilted fiber grating (Ex-TFG) with light intensity demodulation is proposed. The basic principles and sensing characteristics of vibration sensing of an equal strength cantilever beam and Ex-TFG, the combination of which is applied into vibration sensing, are analyzed. An Ex-TFG is attached to the middle axis of an equal strength cantilever beam. As the vibration of a piezoelectric ceramic causes the equal strength cantilever beam to deform, the same and uniform deformation also occurs on the Ex-TFG...
March 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29597310/optimization-and-characterization-of-preceramic-inks-for-direct-ink-writing-of-ceramic-matrix-composite-structures
#4
Giorgia Franchin, Halide Selin Maden, Larissa Wahl, Andrea Baliello, Marco Pasetto, Paolo Colombo
In a previous work, an ink based on a preceramic polymer, SiC fillers, and chopped carbon fibers was proposed for the production of Ceramic Matrix Composite (CMC) structures by Direct Ink Writing (DIW) and subsequent pyrolysis. Thanks to the shear stresses generated at the nozzle tip during extrusion, carbon fibers can be aligned along the printing direction. Fumed silica was added to the ink in order to enhance its rheological properties; however, the printed structures still showed some deformation in the Z direction...
March 28, 2018: Materials
https://www.readbyqxmd.com/read/29569456/is-laser-conditioning-a-valid-alternative-to-conventional-etching-for-aesthetic-brackets
#5
M F Sfondrini, G Calderoni, M C Vitale, P Gandini, A Scribante
AIM: ER:Yag lasers have been described as a more conservative alternative to conventional acid-etching enamel conditioning technique, when bonding conventional metallic orthodontic brackets. Since the use of aesthetic orthodontic brackets is constantly increasing, the purpose of the present report has been to test laser conditioning with different aesthetic brackets. MATERIALS AND METHODS: Study Design: Five different aesthetic brackets (microfilled copolymer, glass fiber, sapphire, polyoxymethylene and sintered ceramic) were tested for shear bond strength and Adhesive Remnant Index scores using two different enamel conditioning techniques (acid etching and ER:Yag laser application)...
March 2018: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29564943/review-of-refractory-ceramic-fiber-rcf-toxicity-epidemiology-and-occupational-exposure
#6
L Daniel Maxim, Mark J Utell
This literature review on refractory ceramic fibers (RCF) summarizes relevant information on manufacturing, processing, applications, occupational exposure, toxicology and epidemiology studies. Rodent toxicology studies conducted in the 1980s showed that RCF caused fibrosis, lung cancer and mesothelioma. Interpretation of these studies was difficult for various reasons (e.g. overload in chronic inhalation bioassays), but spurred the development of a comprehensive product stewardship program under EPA and later OSHA oversight...
March 22, 2018: Inhalation Toxicology
https://www.readbyqxmd.com/read/29495798/novel-instrument-for-characterizing-comprehensive-physical-properties-under-multi-mechanical-loads-and-multi-physical-field-coupling-conditions
#7
Changyi Liu, Hongwei Zhao, Zhichao Ma, Yuansen Qiao, Kun Hong, Zhuang Ren, Jianhai Zhang, Yongmao Pei, Luquan Ren
Functional materials represented by ferromagnetics and ferroelectrics are widely used in advanced sensor and precision actuation due to their special characterization under coupling interactions of complex loads and external physical fields. However, the conventional devices for material characterization can only provide a limited type of loads and physical fields and cannot simulate the actual service conditions of materials. A multi-field coupling instrument for characterization has been designed and implemented to overcome this barrier and measure the comprehensive physical properties under complex service conditions...
February 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29451650/comparison-of-deflection-forces-of-esthetic-archwires-combined-with-ceramic-brackets
#8
Murilo Matias, Marcos Roberto de Freitas, Karina Maria Salvatore de Freitas, Guilherme Janson, Rodrigo Hitoshi Higa, Manoela Fávaro Francisconi
Coated archwires and ceramic brackets have been developed to improve facial esthetics during orthodontic treatment. However, their mechanical behavior has been shown to be different from metallic archwires and brackets. Therefore, the aim of this study was to compare the deflection forces in coated nickel-titanium (NiTi) and esthetic archwires combined with ceramic brackets. Material and Methods Non-coated NiTi (NC), rhodium coated NiTi (RC), teflon coated NiTi (TC), epoxy coated NiTi (EC), fiber-reinforced polymer (FRP), and the three different conventional brackets metal-insert polycrystalline ceramic (MI-PC), polycrystalline ceramic (PC) and monocrystalline ceramic (MC) were used...
2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29448629/synthesis-and-characterization-of-calcium-phosphate-ceramic-poly-vinyl-alcohol-polycaprolactone-bilayer-nanocomposites-a-bone-tissue-regeneration-scaffold
#9
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
β Tricalcium phosphate ceramic was used to reinforce nanofibers in composite mats produced via electrospinning of poly(vinyl alcohol) (PVA), polycaprolactone (PCL) and (PVA: PCL) bilayers. The role of TCP ceramic on morphology of nanocomposites, crystalline structure, functional groups and thermal behaviour of nanocomposites were characterized by SEM, EDAX, XRD, FTIR and DSC analysis. Ultrathin cross-sections of the obtained nanocomposites were morphologically investigated with SEM and all fabricated composites consisted of fibers with average fiber diameter (AFD) around 100 nm except PCL-TCP fibers having AFD in the range of 608 nm...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442772/mechanical-and-electrical-properties-of-direct-spun-carbon-nanotube-fibers-exposed-to-ultrahigh-temperatures-in-vacuum
#10
Xiao-Shan Zhang, Ling-Wei Yang, Hai-Tao Liu, Mei Zu
Carbon nanotube (CNT) fibers are promising reinforcements in ceramic matrix composites where the service environments involve extremely high temperatures that are generally beyond 1000 °C. This work focuses on the thermal stability of a direct spun CNT fiber in vacuum and in a wide temperature (25-2000 °C). The microstructure, mechanical and electrical properties of the fibers as a function of the heat-treatment temperature were investigated. The results show that high temperature exposure could increase the defect density and loosen the packing state of the fiber, but enhance the graphitization degree of the CNTs...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29434426/reappraisal-of-percutaneous-transluminal-laser-angioplasty
#11
REVIEW
Shoichi D Takekawa
Background and aims: We devised a technique to treat peripheral arterial disease (PAD) with laser, i.e. percutaneous transluminal laser angioplasty (PTLA). Considerable good results were obtained with PTLA, but it is apparently considered obsolete as a technique to treat occlusive arterial disease of peripheral arteries, perhaps because of the development and improvement of stents and the ease of their use compared to the somewhat intricate technique required for PTLA. Although the author admits the usefulness of stents, they are foreign to a human body...
December 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29413864/simultaneous-measurements-of-ascorbate-and-glutamate-in-vivo-in-the-rat-brain-using-carbon-fiber-nanocomposite-sensors-and-microbiosensor-arrays
#12
Nuno R Ferreira, Ana Ledo, João Laranjinha, Greg A Gerhardt, Rui M Barbosa
Nanocomposite sensors consisting of carbon fiber microelectrodes modified with Nafion® and carbon nanotubes, and ceramic-based microelectrode biosensor arrays were used to measure ascorbate and glutamate in the brain with high spatial, temporal and chemical resolution. Nanocomposite sensors displayed electrocatalytic properties towards ascorbate oxidation, translated into a negative shift from +0.20V to -0.05V vs. Ag/AgCl, as well as a significant increase (10-fold) of electroactive surface area. The estimated average basal concentration of ascorbate in vivo in the CA1, CA3 and dentate gyrus (DG) sub regions of the hippocampus were 276±60μM (n=10), 183±30μM (n=10) and 133±42μM (n=10), respectively...
January 31, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/29411972/3d-fiber-network-reinforced-bicontinuous-composite-solid-electrolyte-for-dendrite-free-lithium-metal-batteries
#13
Dan Li, Long Chen, Tianshi Wang, Li-Zhen Fan
Replacement of flammable organic liquid electrolytes with solid Li+ conductors is a promising approach to realize excellent performance of Li metal batteries. However, ceramic electrolytes are either easily reduced by Li metal or penetrated by Li dendrites through their grain boundaries, and polymer electrolytes are also faced with instability on the electrode/electrolyte interface and weak mechanical property. Here we report a 3D fiber-network reinforced bicontinuous solid composite electrolyte with flexible Li+-conductive network (lithium aluminum titanium phosphate (LATP)/polyacrylonitrile (PAN)), which helps to enhance electrochemical stability on the electrode/electrolyte interface by isolating Li and LATP, and suppress Li dendrites growth by mechanical reinforcement of fiber-network for the composite solid electrolyte...
February 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29387618/fracture-resistance-of-tilted-premolars-restored-with-different-post-core-systems
#14
Khalid M Abdelaziz, Ashraf A Khalil, Ibrahim Y Alsalhi, Ali J Almufarrij, Ahmed Y Mojathel
Aims and Objective: To assess the effect of root tilt on the fracture resistance and failure pattern of endodontically-treated premolars restored with different post-core systems. Materials and Methods: Ninety endodontically-treated premolars were mounted in acrylic blocks with 0°, 12°, and 24° axial root tilt. Teeth in each group were restored in three subgroups with cast post-core, readymade metal posts and composite cores, and fiber post and composite cores...
November 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/29385032/disilicate-dental-ceramic-surface-preparation-by-1070-nm-fiber-laser-thermal-and-ultrastructural-analysis
#15
Carlo Fornaini, Federica Poli, Elisabetta Merigo, Nathalie Brulat-Bouchard, Ahmed El Gamal, Jean-Paul Rocca, Stefano Selleri, Annamaria Cucinotta
Lithium disilicate dental ceramic bonding, realized by using different resins, is strictly dependent on micro-mechanical retention and chemical adhesion. The aim of this in vitro study was to investigate the capability of a 1070 nm fiber laser for their surface treatment. Samples were irradiated by a pulsed fiber laser at 1070 nm with different parameters (peak power of 5, 7.5 and 10 kW, repetition rate (RR) 20 kHz, speed of 10 and 50 mm/s, and total energy density from 1.3 to 27 kW/cm²) and the thermal elevation during the experiment was recorded by a fiber Bragg grating (FBG) temperature sensor...
January 31, 2018: Bioengineering
https://www.readbyqxmd.com/read/29373487/the-mechanical-properties-of-biocompatible-apatite-bone-cement-reinforced-with-chemically-activated-carbon-fibers
#16
Anne V Boehm, Susanne Meininger, Annemarie Tesch, Uwe Gbureck, Frank A Müller
Calcium phosphate cement (CPC) is a well-established bone replacement material in dentistry and orthopedics. CPC mimics the physicochemical properties of natural bone and therefore shows excellent in vivo behavior. However, due to their brittleness, the application of CPC implants is limited to non-load bearing areas. Generally, the fiber-reinforcement of ceramic materials enhances fracture resistance, but simultaneously reduces the strength of the composite. Combining strong C-fiber reinforcement with a hydroxyapatite to form a CPC with a chemical modification of the fiber surface allowed us to adjust the fiber-matrix interface and consequently the fracture behavior...
January 26, 2018: Materials
https://www.readbyqxmd.com/read/29346725/rapid-chemical-vapor-infiltration-of-silicon-carbide-minicomposites-at-atmospheric-pressure
#17
Kenneth Petroski, Shannon Poges, Chris Monteleone, Joseph Grady, Ram Bhatt, Steven L Suib
The chemical vapor infiltration technique is one of the most popular for the fabrication of the matrix portion of a ceramic matrix composite. This work focuses on tailoring an atmospheric pressure deposition of silicon carbide onto carbon fiber tows using the methyltrichlorosilane (CH3 SiCl3 ) and H2 deposition system at atmospheric pressure to create minicomposites faster than low pressure systems. Adjustment of the flow rate of H2 bubbled through CH3 SiCl3 will improve the uniformity of the deposition as well as infiltrate the substrate more completely as the flow rate is decreased...
February 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29341858/respiratory-assessment-of-refractory-ceramic-fibers-in-a-heating-technician-population
#18
David Lucas, Vincent Clamagirand, Pascale Capellmann, Agnès Hervé, Gilles Mauguen, Yannik Le Mer, Dominique Jegaden
Refractory ceramic fibers (RCF) have been extensively used for insulation in condensing boilers. The aim of this study was to evaluate the respiratory exposure to these fibers among maintenance heating technicians. We first created a working group (Carsat Brittany and Finistère Occupational Health Services) and carried out a sampling strategy. Atmospheric measurements were done during work tasks, and filters were analyzed by phase contrast microscopy (PCM) and scanning electron microscopy (SEM) in French approved laboratories...
January 17, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29329225/optical-fiber-demodulation-system-with-high-performance-for-assessing-fretting-damage-of-steam-generator-tubes
#19
Peijian Huang, Ning Wang, Junying Li, Yong Zhu, Jie Zhang, Zhide Xi
In order to access the fretting damage of the steam generator tube (SGT), a fast fiber Fabry-Perot (F-P) non-scanning correlation demodulation system based on a super luminescent light emitting diode (SLED) was performed. By demodulating the light signal coming out from the F-P force sensor, the radial collision force between the SGT and the tube support plate (TSP) was interrogated. For higher demodulation accuracy, the effects of the center wavelength, bandwidth, and spectrum noise of SLED were discussed in detail...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29305571/laser-application-to-the-root-surface-increases-the-bonding-strength-of-surface-treated-prefabricated-glass-fiber-posts-in-teeth-with-excessive-substance-loss
#20
Zuhal Gorus, Ayse Mese, Berivan Dundar Yilmaz, Ozkan Adiguzel
BACKGROUND This study examined the effect of roughening of the root surface using an erbium-doped yttrium aluminum garnet (Er: YAG) laser on the binding strength of teeth undergoing root canal treatment. MATERIAL AND METHODS Ninety single-rooted teeth were used and assigned randomly to 9 groups (n=10 each). Root canals were prepared using the FlexMaster rotary system. An Er: YAG laser was applied to the root canals in Group 1, with no surface treatment of the glass-fiber post. In Group 2, aluminum oxide particles were applied...
January 6, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
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