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https://www.readbyqxmd.com/read/29791395/fiber-optic-fabry-perot-pressure-sensor-based-on-low-temperature-co-fired-ceramic-technology-for-high-temperature-applications
#1
Jia Liu, Pinggang Jia, Huixin Zhang, Xiaodan Tian, Hao Liang, Yingping Hong, Ting Liang, Wenyi Liu, Jijun Xiong
In this study, a novel batch-producible fiber-optic Fabry-Perot (FP) pressure sensor based on a low-temperature co-fired ceramic technology is proposed and experimentally demonstrated for high-temperature applications. The sensor is fabricated by inserting a well-cut single-mode fiber (SMF) into a zirconia fiber ferrule, followed by insertion of the overall structure into an alumina sensor head. The FP cavity in the sensor is formed by placing the end face of the SMF in parallel to the diaphragm. The external pressure can be detected by demodulating the FP cavity length of the sensor...
May 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791129/formation-of-deep-electron-trap-by-yb-3-codoping-leads-into-super-long-persistent-luminescence-in-ce-3-doped-yttrium-aluminum-gallium-garnet-phosphors
#2
Jumpei Ueda, Shun Miyano, Setsuhisa Tanabe
The Y3 Al2 Ga3 O12 :Ce3+ -Cr3+ compound is one of the brightest persistent phosphors, but its persistent luminescence (PersL) duration is not so long due to the relatively shallow Cr3+ electron trap. Comparing the vacuum referred binding energy of the electron trapping state by Cr3+ and those by lanthanide ions, we selected Yb3+ as a deeper electron trapping center. The Y3 Al2 Ga3 O12 :Ce3+ -Yb3+ phosphors show Ce3+ :5d→4f green persistent luminescence after ceasing blue light excitation. The formation of Yb2+ was confirmed by the increased intensity of absorption at 585 nm during the charging process...
May 23, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29790348/bioinspired-photocatalytic-shark-skin-surfaces-with-antibacterial-and-antifouling-activity-via-nanoimprint-lithography
#3
Feyza Dundar Arisoy, Kristopher W Kolewe, Benjamin Homyak, Irene S Kurtz, Jessica D Schiffman, James J Watkins
By combining antifouling shark skin patterns with antibacterial titanium dioxide (TiO2) nanoparticles (NPs), we present a simple route towards producing durable multifunctional surfaces that decrease microbial attachment and inactivate attached microorganisms. Norland Optical Adhesive (NOA), a UV-crosslinkable adhesive material was loaded with 0, 10, or 50 wt% TiO2 NPs from which shark skin microstructures were imprinted using solvent-assisted soft nanoimprint lithography on a polyethylene terephthalate (PET) substrate...
May 23, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29790033/biomechanical-properties-of-polymer-infiltrated-ceramic-crowns-on-one-piece-zirconia-implants-after-long-term-chewing-simulation
#4
Pia Baumgart, Holger Kirsten, Rainer Haak, Constanze Olms
BACKGROUND: Implant and superstructure provide a complex system, which has to withstand oral conditions. Concerning the brittleness of many ceramics, fractures are a greatly feared issue. Therefore, polymer-infiltrated ceramic networks (PICNs) were developed. Because of its low Young's modulus and high elastic modulus, the PICN crown on a one-piece zirconia implant might absorb forces to prevent the system from fracturing in order to sustain oral forces. Recommendations for the material of superstructure on zirconia implants are lacking, and only one study investigates PICN crowns on these types of implants...
May 23, 2018: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/29789162/fatigue-failure-load-of-an-adhesively-cemented-lithium-disilicate-glass-ceramic-conventional-ceramic-etching-vs-etch-prime-one-step-primer
#5
Maitê Munhoz Scherer, Catina Prochnow, Andressa Borin Venturini, Gabriel Kalil Rocha Pereira, Thiago Augusto de Lima Burgo, Marília Pivetta Rippe, Luiz Felipe Valandro
OBJECTIVES: To evaluate the effect of different glass-ceramic surface treatments and aging on the fatigue failure load of a lithium disilicate glass-ceramic adhesively cemented to a dentin analogue material. METHODS: One hundred and twenty (120) disc-shaped lithium disilicate specimens (Ø=10mm, thickness=1.5mm) were produced and randomly allocated (n=20) into 6 groups, considering 2 study factors: "surface treatment" in 3 levels (SIL-silane application only; HF5+SIL-5% hydrofluoric acid etching and silane application; ME&P-etching with an one-step ceramic primer), and "storage" in 2 levels (baseline-storage for 7 days; aging-storage for 90 days+12,000 thermal cycles)...
May 19, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29785602/feasibility-study-of-cadmium-adsorption-by-palm-oil-fuel-ash-pofa-based-low-cost-hollow-fibre-zeolitic-membrane
#6
Mohamad Sukri Mohamad Yusof, Mohd Hafiz Dzarfan Othman, Azeman Mustafa, Mukhlis Abdul Rahman, Juhana Jaafar, Ahmad Fauzi Ismail
Palm oil fuel ash (POFA) is an agricultural waste which was employed in this study to produce novel adsorptive ceramic hollow fibre membranes. The membranes were fabricated using phase inversion-based extrusion technique and sintered at 1150 °C. The membranes were then evaluated on their ability to adsorb cadmium (Cd(II)). These membranes were characterised using (nitrogen) N2 adsorption-desorption analysis, field emission scanning electron microscopy-energy-dispersive X-ray spectroscopy (FESEM-EDX) mapping, X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses while adsorptivity activity was examined by batch adsorption studies...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29784992/dependences-of-microstructure-on-electromagnetic-interference-shielding-properties-of-nano-layered-ti-3-alc-2-ceramics
#7
Yongqiang Tan, Heng Luo, Xiaosong Zhou, Shuming Peng, Haibin Zhang
The microstructure dependent electromagnetic interference (EMI) shielding properties of nano-layered Ti3 AlC2 ceramics were presented in this study by comparing the shielding properties of various Ti3 AlC2 ceramics with distinct microstructures. Results indicate that Ti3 AlC2 ceramics with dense microstructure and coarse grains are more favourable for superior EMI shielding efficiency. High EMI shielding effectiveness over 40 dB at the whole Ku-band frequency range was achieved in Ti3 AlC2 ceramics by microstructure optimization, and the high shielding effectiveness were well maintained up to 600 °C...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784462/promoting-porcelain-zirconia-bonding-using-different-atmospheric-pressure-gas-plasmas
#8
Yi-Chuan Liu, Jung-Pei Hsieh, Yung-Chung Chen, Li-Li Kang, Chii-Shyang Hwang, Shu-Fen Chuang
OBJECTIVES: To evaluate the effects of different atmospheric-pressure plasma (APP) on the physicochemical properties of yttria-stabilized zirconia, and promoting the adhesion of veneering porcelain. METHODS: Cercon base zirconia disks were prepared to receive different treatments: as-polished, three APPs (oxygen, OP; argon, AP; and CF4 , CP), and grit-blasted (GB). Their surface roughness and hydrophilicity were measured, and surface morphology was examined either after treatments, after simulated porcelain firing, or additional thermal etching...
May 18, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29783705/additive-manufacturing-of-metallic-and-ceramic-components-by-the-material-extrusion-of-highly-filled-polymers-a-review-and-future-perspectives
#9
REVIEW
Joamin Gonzalez-Gutierrez, Santiago Cano, Stephan Schuschnigg, Christian Kukla, Janak Sapkota, Clemens Holzer
Additive manufacturing (AM) is the fabrication of real three-dimensional objects from metals, ceramics, or plastics by adding material, usually as layers. There are several variants of AM; among them material extrusion (ME) is one of the most versatile and widely used. In MEAM, molten or viscous materials are pushed through an orifice and are selectively deposited as strands to form stacked layers and subsequently a three-dimensional object. The commonly used materials for MEAM are thermoplastic polymers and particulate composites; however, recently innovative formulations of highly-filled polymers (HP) with metals or ceramics have also been made available...
May 18, 2018: Materials
https://www.readbyqxmd.com/read/29783668/a-comprehensive-characterization-of-a-10-at-yb-ysag-laser-ceramic-sample
#10
Angela Pirri, Guido Toci, Jiang Li, Yagang Feng, Tengfei Xie, Zhaoxiang Yang, Barbara Patrizi, Matteo Vannini
We report a comprehensive characterization of a 10 at.% Yb3+ -doped YSAG (Yb:Y₃Scx Al(5-x) O12 , x = 1.5) ceramic, including microstructural, spectroscopic and laser properties. Moreover, we illustrate and discuss the fabrication technique. Yb3+ in YSAG features a broader absorption and emission band than in traditional YAG, which is advantageous for laser applications (i.e., tunable laser sources, ultrafast pulse generation). Pumping in a quasi continuous wave regime at 936 nm, the ceramic has shown good laser performance as the maximum output power was 6...
May 18, 2018: Materials
https://www.readbyqxmd.com/read/29782609/low-cost-customized-cranioplasty-using-a-3d-digital-printing-model-a-case-report
#11
Abel De La Peña, Javier De La Peña-Brambila, Juan Pérez-De La Torre, Miguel Ochoa, Guillermo J Gallardo
Background: Cranial defects usually occur after trauma, neurosurgical procedures like decompressive craniotomy, tumour resections, infection and congenital defects. The purpose of cranial vault repair is to protect the underlying brain tissue, to reduce any localized pain and patient anxiety, and improve cranial aesthetics. Cranioplasty is a frequent neurosurgical procedure achieved with the aid of cranial prosthesis made from materials such as: titanium, autologous bone, ceramics and polymers...
2018: 3D printing in medicine
https://www.readbyqxmd.com/read/29782585/exploring-transformations-in-caribbean-indigenous-social-networks-through-visibility-studies-the-case-of-late-pre-colonial-landscapes-in-east-guadeloupe-french-west-indies
#12
Tom Brughmans, Maaike S de Waal, Corinne L Hofman, Ulrik Brandes
This paper presents a study of the visual properties of natural and Amerindian cultural landscapes in late pre-colonial East-Guadeloupe and of how these visual properties affected social interactions. Through a review of descriptive and formal visibility studies in Caribbean archaeology, it reveals that the ability of visual properties to affect past human behaviour is frequently evoked but the more complex of these hypotheses are rarely studied formally. To explore such complex hypotheses, the current study applies a range of techniques: total viewsheds, cumulative viewsheds, visual neighbourhood configurations and visibility networks...
2018: Journal of archaeological method and theory
https://www.readbyqxmd.com/read/29781768/guided-bone-regeneration-and-implant-placement-in-association-with-a-coronally-positioned-palatal-sliding-flap-a-17-year-follow-up-case-report
#13
Carlo Maiorana, Pier Paolo Poli, Mario Beretta
The aim of the present case report was to show the 17-year hard and soft tissues stability of guided bone regeneration procedure associated with dental implants insertion. A 52-year-old male patient presented with a partial edentulism in the upper right maxilla. A graft consisting of deproteinized bovine bone mineral and autogenous bone stabilized by a non-resorbable expanded polytetrafluoroethylene membrane was used to reconstruct the missing bone applying the biological principles of guided bone regeneration...
May 21, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29781248/the-role-of-3d-printing-in-treating-craniomaxillofacial-congenital-anomalies
#14
REVIEW
Christopher D Lopez, Lukasz Witek, Andrea Torroni, Roberto L Flores, David B Demissie, Simon Young, Bruce N Cronstein, Paulo G Coelho
Craniomaxillofacial congenital anomalies comprise approximately one third of all congenital birth defects and include deformities such as alveolar clefts, craniosynostosis, and microtia. Current surgical treatments commonly require the use of autogenous graft material which are difficult to shape, limited in supply, associated with donor site morbidity and cannot grow with a maturing skeleton. Our group has demonstrated that 3D printed bio-ceramic scaffolds can generate vascularized bone within large, critical-sized defects (defects too large to heal spontaneously) of the craniomaxillofacial skeleton...
May 20, 2018: Birth Defects Research
https://www.readbyqxmd.com/read/29780246/remineralization-potential-of-nano-hydroxyapatite-on-enamel-and-cementum-surrounding-margin-of-computer-aided-design-and-computer-aided-manufacturing-ceramic-restoration
#15
Niwut Juntavee, Apa Juntavee, Preeyarat Plongniras
Objective: This study investigates the effects of nano-hydroxyapatite (NHA) gel and Clinpro (CP) on remineralization potential of enamel and cementum at the cavosurface area of computer-aided design and computer-aided manufacturing ceramic restoration. Materials and methods: Thirty extracted human mandibular third molars were sectioned at 1 mm above and below the cemento-enamel junction to remove the cemento-enamel junction portions and replaced them with zirconia ceramic disks by bonding them to the crown and root portions with resin cement...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29779279/-effects-of-recasting-in-vacuum-with-argon-on-the-chemical-composition-of-ceramic-alloys
#16
Ying-Hui Wang, Fen-Fang Qiu, Wei-Qing Wu, Hui Cheng
OBJECTIVE: This study aimed to determine the effect of recasting in vacuum with argon on the chemical composition of cobalt-chromium (Co-Cr), commercially pure titanium (cpTi), palladium-based (Pd-based), and aurum-platinum (Au-
Pt) ceramic alloys. METHODS: Without adding new alloys, Co-Cr, cpTi, Pd-based, and Au-Pt ceramic alloys were recast one to three times under the condition of vacuum compressive casting with argon. Before recasting, four previously cast ceramic alloys were treated with the corresponding method...
April 1, 2018: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29779182/locator%C3%A2-versus-ceramic-electroplated-double-crown-attachments-a-prospective-study-on-the-intraindividual-comparison-of-implant-supported-mandibular-prostheses
#17
Silvia Brandt, Jan Brandt, Ali-Reza Ketabi, Hans-Christoph Lauer, Anna Kunzmann
OBJECTIVES: Implant-supported overdentures are an established dental treatment mode. The aim of this prospective study was and interindividual comparison of patient satisfaction with restorations retained by a prefabricated and thus inexpensive attachment system (Locator®) or with a technologically complex and thus expensive attachment system (ceramic/electroplated double crowns) with similar retentive performance. MATERIALS AND METHODS: Twelve patients received a Locator and a double-crown prosthesis in a crossover study for test periods of 3 months each...
May 19, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29778127/study-of-two-body-wear-performance-of-dental-materials
#18
Xin Hu, Qian Zhang, Jia Ning, Wenmeng Wu, Changyi Li
INTRODUCTION: The purpose of this study was to evaluate the two-body wear resistances of natural enamel and four dental materials in vitro. METHODS: The testing machine was modified to form a type of pin-on-disk wear test apparatus. Four dental material specimens (Au-Pd alloy, Ag-Pd alloy, FiltekTMP60 and FiltekTMZ350 composite resins) and enamel were used as the pins, and a steatite ceramic grinding wheel was used as the abrasive counter face. The wear volume loss and the rigidity value was measured...
June 2018: Journal of the National Medical Association
https://www.readbyqxmd.com/read/29778056/one-century-sedimentary-record-of-heavy-metal-pollution-in-western-taihu-lake-china
#19
Yan Li, Shenglu Zhou, Qing Zhu, Baojie Li, Junxiao Wang, Chunhui Wang, Lian Chen, Shaohua Wu
Long-term trends of sediment compositions are important for assessing the impact of human activities on the sediment and protecting the sediment environment. In this study, based on the contents of heavy metals and the Pb isotope ratios in lake sediments, atmospheric dustfall and soil in Yixing, China, the representative heavy metals (Zn, Pb, Cr and Cd) in lake sediments from western Taihu Lake were studied. The evolution history of heavy metals in the local environment was constructed for the past 100 years...
May 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29777736/edge-strength-of-cad-cam-materials
#20
Maria Pfeilschifter, Verena Preis, Michael Behr, Martin Rosentritt
OBJECTIVES: To investigate the edge force of CAD/CAM materials as a function of (a) material, (b) thickness, and (c) distance from the margin. METHODS: Materials intended for processing with CAD/CAM were investigated: eight resin composites, one resin-infiltrated ceramic, and a clinically proven lithiumdisilicate ceramic (reference). To measure edge force (that is, load to failure/crack), plates (d = 1 mm) were fixed and loaded with a Vickers diamond indenter (1 mm/min, Zwick 1446) at a distance of 0...
May 16, 2018: Journal of Dentistry
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