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https://www.readbyqxmd.com/read/28443832/protective-buffering-capacity-of-restorative-dental-materials-in-vitro
#1
Markus Fuss, Michael J Wicht, Thomas Attin, Sonja H M Derman, Michael J Noack
PURPOSE: To investigate the buffering capacity of restorative materials during a simulated carious and intrinsic erosive attack. MATERIALS AND METHODS: Cavities with a volume of 130 μl were milled (Cerec MC XL) out of blocks of Ceram X Mono (CM), Quixfil (QX), Filtek Supreme (FS), Apa Fill 3 (AF), an experimental dual-curing composite containing a bioactive glass (EX), Dyract eXtra (DY), Beautifil (BE), Equia Fil (EQ), Telio CAD (TL) (negative control), TheraCal (TC; positive control), and extracted teeth (ED)...
April 25, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28427632/ultrasonic-treatment-of-cofe2o4-b2o3-sio2-as-a-new-hybrid-magnetic-composite-nanostructure-and-catalytic-application-in-the-synthesis-of-dihydroquinazolinones
#2
Ali Maleki, Morteza Aghaei, Hamid Reza Hafizi-Atabak, Mohammad Ferdowsi
New hybrid magnetic composite nanostructure are prepared via ultrasonic treatment by glass-ceramic method, characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), energy-dispersive X-ray (EDX), element distribution image (EDX mapping), thermal gravimetric analysis (TGA)/differential thermal analysis (DTA) and N2 adsorption-desorption by Brunauer-Emmett-Teller (BET) analyses. Then, the catalytic activity of the prepared CoFe2O4@B2O3-SiO2 nanoparticles was tested in the synthesis of 2-substituted-3-(phenylamino)-dihydroquinazolin-4(1H)-ones in deep eutectic solvent (DES) based on choline chloride as an eco-friendly and recyclable media...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28421736/enhancing-the-bioactivity-of-yttria-stabilized-tetragonal-zirconia-ceramics-via-grain-boundary-activation
#3
Jinhuan Ke, Jiandong Ye, Fupo He
Yttria-stabilized tetragonal zirconia (Y-TZP) has been proposed as a potential dental implant due to its good biocompatibility, excellent mechanical properties, and distinctive aesthetic effect. However, Y-TZP cannot form chemical bonds with bone tissue because of its biological inertness, which affects the reliability and long-term efficacy of Y-TZP implants. In this study, to improve the bioactivity of Y-TZP ceramics while maintaining their good mechanical performance, Y-TZP was modified by grain boundary activation via the infiltration of a bioactive glass (BG) sol into the surface layer of Y-TZP ceramics under different negative pressures (atmospheric pressure, -0...
April 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28420829/bonding-measurement-strength-and-fracture-mechanics-approaches
#4
Chuchai Anunmana, Wiroj Wansom
This study investigated the effect of cross-sectional areas on interfacial fracture toughness and bond strength of bilayered dental ceramics. Zirconia core ceramics were veneered and cut to produce specimens with three different cross-sectional areas. Additionally, monolithic specimens of glass veneer were also prepared. The specimens were tested in tension until fracture at the interface and reported as bond strength. Fracture surfaces were observed, and the apparent interfacial toughness was determined from critical crack size and failure stress...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28417581/radiopacity-of-resin-cements-using-digital-radiography
#5
Sherif Hosney, Hanan K Abouelseoud, Omar El-Mowafy
STATEMENT OF PROBLEM: Monitoring performance of glass-ceramic based indirect restorations using radiographic imaging might be difficult due to their low radiopacity. Therefore, materials used for their cementation must possess adequate radiopacity. PURPOSE: This study determined radiopacity of a group of resin-cements used for adhesive-cementation of glass-ceramic-based restorations using digital radiography. METHODS: Two specimens were prepared from a group of resin cements (VariolinkII-opaque, VariolinkII-opaque (base), VariolinkII-Transparent, VariolinkII-Transparent (base), Nexus, RelyX Unicem, RelyX ultimate, Duolink, Monocem and Resinomer) and longitudinal sections of same thickness were obtained from molar and premolar...
April 18, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28415541/synthesis-characterization-of-caf2-doped-silicate-glass-ceramics
#6
Madeeha Riaz, Rehana Zia, Ambreen Mirza, Tousif Hussain, Farooq Bashir, Safia Anjum
This paper reports the fabrication and characterization of silicate glass-ceramics doped with (0-12mol%) CaF2. TGA-DSC analysis was carried out to determine the crystallization temperature and stability of glass measured by two glass parameters; Hruby parameter KH=(Tx-Tg)/(TL-Tx) and Weinberg parameter KW=(Tc-Tg)/TL. It was found that with CaF2 doping improved sinterability at low temperature and provided stability to the glass. The XRD pattern exhibits a single phase of combeite and doping of CaF2 cause increase in crystallite size...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415277/sintering-of-polydisperse-viscous-droplets
#7
Fabian B Wadsworth, Jérémie Vasseur, Edward W Llewellin, Donald B Dingwell
Sintering-or coalescence-of compacts of viscous droplets is driven by the interfacial tension between the droplets and the interstitial gas phase. The process, which occurs in a range of industrial and natural settings, such as the manufacture of ceramics and the welding of volcanic ash, causes the compact to densify, to become stronger, and to become less permeable. We investigate the role of droplet polydispersivity in sintering dynamics by conducting experiments in which populations of glass spheres with different size distributions are heated to temperatures above the glass transition interval...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28402738/ferrule-effect-dominates-over-use-of-a-fiber-post-when-restoring-endodontically-treated-incisors-an-in-vitro-study
#8
P Magne, P C Lazari, M A Carvalho, T Johnson, A A Del Bel Cury
OBJECTIVES: The aim of this study was to investigate the restoration of broken-down endodontically treated incisors with the ferrule effect using glass ceramic crowns bonded to composite resin core buildups with or without a fiber post. A no-ferrule group with post was also included for comparison. METHODS AND MATERIALS: Thirty decoronated endodontically treated bovine incisors with a 2-mm ferrule were restored with a direct buildup using a nanohybrid direct composite resin (Miris 2 and Optibond FL) with or without a glass-fiber-reinforced post...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28398648/esthetic-rehabilitation-of-retained-primary-teeth-a-conservative-approach
#9
Cristina Parise Gré, Vitor Schweigert Bona, Diogo Pedrollo Lise, Sylvio Monteiro Júnior
With the advancement in ceramic restorations bonded to tooth structure, the treatment has become a feasible and conservative option to restore teeth with alteration in shape when owing to high demand in esthetics, with or without minimum tooth preparation. This article describes a report of a 32-year-old woman who was dissatisfied with her smile. The patient reported that she still had deciduous teeth, and that the maxillary lateral incisors had been restored with direct resin composite to correct the teeth shape...
April 11, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28398066/structural-and-theoretical-study-of-strontium-borophosphate-glasses-using-raman-spectroscopy-and-ab-initio-molecular-orbital-method
#10
Maria Anastasopoulou, Konstantinos C Vasilopoulos, Dimitrios F Anagnostopoulos, Ioannis Koutselas, Demetrios K Papayannis, Michael A Karakassides
Strontium borophosphate glasses of composition xSrO•(1-x)•[0.68B2O3•0.32P2O5], 0.40 ≤ x ≤ 0.68, have been prepared by fast quenching of high temperature melts and studied using Raman spectroscopy. In order to comprehend and confirm the obtained spectroscopic Raman data, crystalline compounds and glass-ceramics of analogous compositions were also prepared and studied. Also, ab initio molecular electronic structure theory was used to predict and confirm the experimental vibrational spectra The comparison between theoretical and experimental results showed a good overall agreement...
April 11, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28385437/effect-of-prior-silane-application-on-the-bond-strength-of-a-universal-adhesive-to-a-lithium-disilicate-ceramic
#11
André Fábio Vasconcelos Moro, Amanda Barreto Ramos, Gustavo Miranda Rocha, Cesar Dos Reis Perez
STATEMENT OF PROBLEM: Universal adhesives combine silane and various monomers in a single bottle to make them more versatile. Their adhesive performance is unclear. PURPOSE: The purpose of this in vitro study was to assess the effects of an additional silane application before using a universal adhesive on the adhesion between a disilicate glass ceramic and a composite resin by using a microshear bond strength test (μSBS) and fracture analysis immediately and after thermocycling...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28381016/lasing-of-surface-polished-polycrystalline-ho-yag-yttrium-aluminum-garnet-fiber
#12
Hyunjun Kim, Randall S Hay, Sean A McDaniel, Gary Cook, Nicholas G Usechak, Augustine M Urbas, Kathleen N Shugart, HeeDong Lee, Ali H Kadhim, Dean P Brown, Benjamin Griffin, Geoff E Fair, Randall G Corns, Santeri A Potticary, Frank K Hopkins, Kent L Averett, David E Zelmon, Triplicane A Parthasarathy, Kristin A Keller
A polycrystalline 1.5% Ho: YAG fiber with a diameter of 31 µm was prepared. Surface roughness from grain boundary grooving was reduced by polishing, which decreased the fiber scattering coefficient from 76 m<sup>-1</sup> to 35 m<sup>-1</sup>. Lasing tests were done on this fiber with a SF57 Schott glass cladding. Lasing was confirmed by spectrum narrowing with threshold pump power lower than 500 mW and a slope efficiency of 7%. To our knowledge, this is the first lasing demonstration from a small diameter polycrystalline ceramic fiber...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28375299/passive-q-switching-of-an-er-yb-glass-laser-with-co-mg-al-ga-sub-2-sub-o-sub-4-sub-based-glass-ceramics
#13
V Vitkin, P Loiko, O Dymshits, A Zhilin, I Alekseeva, D Sabitova, A Polishchuk, A Malyarevich, X Mateos, K Yumashev
Transparent glass-ceramics (GCs) containing Co:Mg(Al,Ga)<sub>2</sub>O<sub>4</sub> nanocrystals (mean diameter of 7-9 nm) are synthesized by heat treatments at 850-950°C from magnesium aluminosilicate glass nucleated by TiO<sub>2</sub> and doped with Ga<sub>2</sub>O<sub>3</sub> and CoO. The GCs exhibit a broadband A<sub>2</sub>4(F4)→T<sub>1</sub>4(F4) absorption due to the Co<sup>2+</sup> ions, low saturation fluence (∼0...
March 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28374782/quinuclidinium-salt-ferroelectric-thin-film-with-duodecuple-rotational-polarization-directions
#14
Yu-Meng You, Yuan-Yuan Tang, Peng-Fei Li, Han-Yue Zhang, Wan-Ying Zhang, Yi Zhang, Heng-Yun Ye, Takayoshi Nakamura, Ren-Gen Xiong
Ferroelectric thin-films are highly desirable for their applications on energy conversion, data storage and so on. Molecular ferroelectrics had been expected to be a better candidate compared to conventional ferroelectric ceramics, due to its simple and low-cost film-processability. However, most molecular ferroelectrics are mono-polar-axial, and the polar axes of the entire thin-film must be well oriented to a specific direction to realize the macroscopic ferroelectricity. To align the polar axes, an orientation-controlled single-crystalline thin-film growth method must be employed, which is complicated, high-cost and is extremely substrate-dependent...
April 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28372374/solid-state-pulse-forming-module-with-adjustable-pulse-duration
#15
Langning Wang, Jinliang Liu, Yongfeng Qiu, Xu Chu, Qingmeng Zhang
A new solid-state pulse forming module is described in this paper. The pulse forming module is fabricated on a glass ceramic substrate, with the dimension of 250 mm × 95 mm × 4 mm. By changing the copper strips used in the pulse forming modules, the pulse duration of the obtained pulsed can range from 80 ns to 140 ns. Both the simulation and tests show that the pulse forming module has a good pulse forming ability. Under a high voltage in microsecond's time, the new pulse forming modules can hold off a voltage up to 25 kV higher than that of the previous study...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28368041/controllable-optical-modulation-of-blue-green-up-conversion-fluorescence-from-tm-3-er-3-single-doped-glass-ceramics-upon-two-step-excitation-of-two-wavelengths
#16
Zhi Chen, Shiliang Kang, Hang Zhang, Ting Wang, Shichao Lv, Qiuqun Chen, Guoping Dong, Jianrong Qiu
Optical modulation is a crucial operation in photonics for network data processing with the aim to overcome information bottleneck in terms of speed, energy consumption, dispersion and cross-talking from conventional electronic interconnection approach. However, due to the weak interactions between photons, a facile physical approach is required to efficiently manipulate photon-photon interactions. Herein, we demonstrate that transparent glass ceramics containing LaF3: Tm(3+) (Er(3+)) nanocrystals can enable fast-slow optical modulation of blue/green up-conversion fluorescence upon two-step excitation of two-wavelengths at telecom windows (0...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28367909/bonding-state-of-metal-free-cad-cam-onlay-restoration-after-cyclic-loading-with-and-without-immediate-dentin-sealing
#17
Noriko Ishii, Toshio Maseki, Yoichiro Nara
To examine the bonding state of metal-free CAD/CAM onlay restorations made from two popular resin composite blocks and a typical glass-ceramic block after cyclic loading, with and without immediate dentin sealing (IDS). Standardized mesial-distal-occlusalbuccal (MODB) cavities in 24 extracted human molars were prepared. The intra-cavity dentin surfaces of half of the cavities were immediately sealed with all-in-one adhesive and flowable composite, while those of the other half were not. All cavities were scanned, from which CAD/CAM onlays were fabricated from three types of block and cemented with an adhesive resin cement system...
March 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28367117/representation-of-glossy-material-surface-in-ventral-superior-temporal-sulcal-area-of-common-marmosets
#18
Naohisa Miyakawa, Taku Banno, Hiroshi Abe, Toshiki Tani, Wataru Suzuki, Noritaka Ichinohe
The common marmoset (Callithrix jacchus) is one of the smallest species of primates, with high visual recognition abilities that allow them to judge the identity and quality of food and objects in their environment. To address the cortical processing of visual information related to material surface features in marmosets, we presented a set of stimuli that have identical three-dimensional shapes (bone, torus or amorphous) but different material appearances (ceramic, glass, fur, leather, metal, stone, wood, or matte) to anesthetized marmoset, and recorded multiunit activities from an area ventral to the superior temporal sulcus (STS) using multi-shanked, and depth resolved multi-electrode array...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28361794/fabrication-of-%C3%AE-tricalcium-phosphate-composite-ceramic-sphere-based-scaffolds-with-hierarchical-pore-structure-for-bone-regeneration
#19
Fupo He, Guowen Qian, Weiwei Ren, Jiyan Li, Peirong Fan, Haishan Shi, Xuetao Shi, Xin Deng, Shanghua Wu, Jiandong Ye
No abstract text is available yet for this article.
April 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28358045/glass-ceramic-optical-fiber-containing-ba2tisi2o8-nanocrystals-for-frequency-conversion-of-lasers
#20
Zaijin Fang, Xusheng Xiao, Xin Wang, Zhijun Ma, Elfed Lewis, Gerald Farrell, Pengfei Wang, Jing Ren, Haitao Guo, Jianrong Qiu
A glass-ceramic optical fiber containing Ba2TiSi2O8 nanocrystals fabricated using a novel combination of the melt-in-tube method and successive heat treatment is reported for the first time. For the melt-in-tube method, fibers act as a precursor at the drawing temperature for which the cladding glass is softened while the core glass is melted. It is demonstrated experimentally that following heat treatment, Ba2TiSi2O8 nanocrystals with diameters below 10 nm are evenly distributed throughout the fiber core...
March 30, 2017: Scientific Reports
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