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https://www.readbyqxmd.com/read/28532039/bioactivity-mechanical-properties-and-drug-delivery-ability-of-bioactive-glass-ceramic-scaffolds-coated-with-a-natural-derived-polymer
#1
M Araújo, R Viveiros, A Philippart, M Miola, S Doumett, G Baldi, J Perez, A R Boccaccini, A Aguiar-Ricardo, E Verné
In this work, hybrid melanin-coated bioactive glass-ceramic multifunctional scaffolds were developed and characterized in terms of mechanical strength, in vitro bioactivity in simulated body fluid (SBF) and ability to load ibuprofen. The coated scaffolds exhibited an accelerated bioactivity in comparison with the uncoated ones, being able of developing hydroxyapatite-like crystals after 7days soaking in simulated body fluid (SBF). Besides its positive influence on the scaffolds bioactivity, the melanin coating was able to enhance their mechanical properties, increasing the initial compressive strength by a factor of >2...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531647/multifunctional-plla-ceramic-fiber-membranes-for-bone-regeneration-applications
#2
Daniel Santos, Dina M Silva, Pedro S Gomes, Maria H Fernandes, José D Santos, Vitor Sencadas
A novel method to process electrospun poly(l-lactic acid) (PLLA) membranes incorporating glass reinforced hydroxyapatite granules (gHA) interspacially between the polymeric fibers is reported, thus increasing the surface area for cellular interactions. gHA granules (≤150μm) electrospun together with the polymer solution, lead to an average fiber diameter of 550±150nm for pristine PLLA and 440±170nm for the composite samples. An increase of the overall porosity was observed, from 79±3% for the PLLA up to 88±5% for the hybrid samples, keeping material's wettability and mechanical properties...
May 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28514349/-elastic-properties-and-porosity-of-dental-blocks-made-from-non-metal-materials-used-for-chairside-cad-cam-crowns
#3
K E Goryainova, E S Morokov, M V Retinskaya, I J Lebedenko
Elastic properties and internal structure of glass-ceramic, feldspatic ceramic, PMMA and hybrid blocks for chairside CAD/CAM dental crowns were assessed by pulsed acoustic microscopy. Elastic modulus of hybrid ceramic was 1.5 times inferior to feldspatic ceramic and glass-ceramic but almost 10 times higher than those of polymer samples. We found the presence of pores from a few to hundreds of microns in the bulk of inorganic materials samples, isolated point defects were revealed in polymer materials while in hybrid material defects were not found...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28514042/effect-of-crystallization-firing-on-marginal-gap-of-cad-cam-fabricated-lithium-disilicate-crowns
#4
Steven A Gold, Jack L Ferracane, Juliana da Costa
PURPOSE: To evaluate the marginal gaps of CAD/CAM (CEREC 3) produced crowns made from leucite-reinforced glass-ceramic (IPS Empress CAD) blocks (LG), and lithium-disilicate (IPS e.max CAD) blocks before (LD-B), and after (LD-A) crystallization firing. MATERIALS AND METHODS: A human molar tooth (#19) was mounted with adjacent teeth on a typodont and prepared for a full-coverage ceramic crown. The typodont was assembled in the mannequin head to simulate clinical conditions...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28508056/picosecond-amorphization-of-sio2-stishovite-under-tension
#5
Masaaki Misawa, Emina Ryuo, Kimiko Yoshida, Rajiv K Kalia, Aiichiro Nakano, Norimasa Nishiyama, Fuyuki Shimojo, Priya Vashishta, Fumihiro Wakai
It is extremely difficult to realize two conflicting properties-high hardness and toughness-in one material. Nano-polycrystalline stishovite, recently synthesized from Earth-abundant silica glass, proved to be a super-hard, ultra-tough material, which could provide sustainable supply of high-performance ceramics. Our quantum molecular dynamics simulations show that stishovite amorphizes rapidly on the order of picosecond under tension in front of a crack tip. We find a displacive amorphization mechanism that only involves short-distance collective motions of atoms, thereby facilitating the rapid transformation...
May 2017: Science Advances
https://www.readbyqxmd.com/read/28496207/selective-doping-of-ni-2-in-highly-transparent-glass-ceramics-containing-nano-spinels-znga2o4-and-zn1-x-ga2-2x-ge-x-o4-for-broadband-near-infrared-fiber-amplifiers
#6
Zhigang Gao, Yinyao Liu, Jing Ren, Zaijin Fang, Xiaosong Lu, Elfed Lewis, Gerald Farrell, Jun Yang, Pengfei Wang
Selective doping of Ni(2+) in octahedral sites provided by nanocrystals embedded in glass-ceramics (GCs) is crucial to the enhancement of broadband near-infrared (NIR) emission. In this work, a NIR emission with a full-width-at-half-maximum (FWHM) of 288 nm is first reported from ZnGa2O4: Ni(2+) nano-spinels embedded GCs with excellent transparency. A comparison is made of the NIR luminescence properties of Ni(2+) doped GCs containing ZnGa2O4, germanium-substituted ZnGa2O4 nano-spinels (Zn1+x Ga2-2x Ge x O4), and Zn2GeO4/Li2Ge4O9 composite nanocrystals that are free of Ga(3+)...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28492650/stabilization-of-a-t-zro2-polymorph-in-a-glassy-sio2-matrix-at-elevated-temperatures-accomplished-by-ceria-additions
#7
S Vasanthavel, Brian Derby, S Kannan
Glass-ceramic composites are considered important candidates for load bearing orthopaedic applications owing to their combined salient features of bioactivity and mechanical strength. Herein, we report the impact of ceria (CeO2) additions on the structural and mechanical behaviour of ZrO2-SiO2 binary oxides as a glass-ceramic composite for hard tissue replacements. A wide range of ceria additions to the ZrO2-SiO2 system have been performed via sol-gel synthesis. The structural behaviour of the synthesized compositions is investigated at elevated temperatures using a combination of XRD, Raman spectroscopy, TEM and SEM...
May 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28484926/effect-of-strontium-substitution-on-the-cytocompatibility-and-3-d-scaffold-structure-for-the-xsro-10-x-mgo-60sio2-20cao-10-p2o5-2%C3%A2-%C3%A2-%C3%A2-x%C3%A2-%C3%A2-%C3%A2-8-sol-gel-glasses
#8
Swati Thakur, Shikha Garg, Gurbinder Kaur, Om Prakash Pandey
In the present study, novel glasses xSrO-(10-x) MgO-60SiO2-20CaO-10 P2O5 (2 ≤ x ≤ 8, in steps of 2) are synthesized via sol-gel method. The current work focusses on the evaluation of mechanical, physical and biocompatible properties for sol-gel glasses. The pore size and surface area of these glasses were studied using BET analysis. The structural aspect of the glasses/glass ceramics was studied by XRD and Raman spectroscopy. The cytotoxicity assays were conducted for MG63 human osteosarcoma cell line...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28482152/hybrid-li-ion-conducting-membrane-as-protection-for-the-li-anode-in-an-aqueous-li-air-battery-coupling-sol-gel-chemistry-and-electrospinning
#9
Gilles Lancel, Philippe Stevens, Gwenaëlle Toussaint, Manuel Maréchal, Natacha Krins, Damien Bregiroux, Christel Laberty-Robert
Aqueous lithium-air batteries have very high theoretical energy densities, which potentially makes this technology very interesting for energy storage in electric mobility applications. However, the aqueous electrolyte requires the use of a watertight layer to protect the lithium metal, typically a thick NASICON glass-ceramic layer, which adds ohmic resistance and penalizes performance. This article deals with the replacement of this ceramic electrolyte by a hybrid organic-inorganic membrane. This new membrane combines an ionically conducting inorganic phase for Li ion transport (Li1...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28467258/effect-of-endocrown-pulp-chamber-extension-depth-on-molar-fracture-resistance
#10
A Hayes, N Duvall, M Wajdowicz, H Roberts
PURPOSE: The purpose of this study was to evaluate the effect of endocrown pulp chamber extension on mandibular molar fracture resistance. METHODS AND MATERIALS: A total of 36 recently extracted mandibular third molars of approximate equal size were sectioned at the facial lingual height of contour followed by endodontic access into the pulp chamber. The specimens were then randomly divided into three groups (n=12) and pulpal and root canal contents removed. Pulp chamber floors were established at 2, 3, and 4 mm from the occlusal table using a three-step etch-and-rinse adhesive and a flowable resin composite...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28467256/stress-strain-analysis-of-premolars-with-non-carious-cervical-lesions-influence-of-restorative-material-loading-direction-and-mechanical-fatigue
#11
A C Machado, C J Soares, B R Reis, A A Bicalho, Lha Raposo, P V Soares
Noncarious cervical lesions (NCCLs) are characterized by a loss of dental structure at the cementoenamel junction (CEJ) caused by stress, biocorrosion, and attrition. Variations in occlusal loading can promote different stress and strain patterns on the CEJ. Restoration of NCCLs is part of lesion management; however, there is still no conclusive restorative protocol for NCCLs. This study aimed to evaluate the stress and strain distribution of maxillary premolars with NCCLs according to three factors: 1) restorative technique; 2) direction of occlusal loading; and 3) mechanical fatigue...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28467038/bioinspired-adhesive-hydrogel-driven-by-adenine-and-thymine
#12
Xin Liu, Qin Zhang, Zijian Gao, Ruibin Hou, Guanghui Gao
Bioinspired strategies have drawn much attention for designing intelligent hydrogels with promising performance. Herein, we present a bioinspired adhesive hydrogel driven by adenine and thymine, which are the basic units of DNA. The adhesive hydrogel exhibited promising adhesive property for the surface of various solid materials, including muscle tissues, plastics, rubbers, glasses, metals, ceramics, carnelians, and woods. The maximum peeling strength of hydrogels was 330 N m(-1) on aluminum, superior to that of PAAm hydrogels with 70 N m(-1)...
May 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28463184/a-method-for-collecting-single-cell-suspensions-using-an-ultrasonic-pump
#13
Misa Nakao, Yuta Kurashina, Chikahiro Imashiro, Kenjiro Takemura
The presence of cell aggregates in cell suspensions may reduce cell culture efficiency because they can induce apoptosis and inhibit proliferation. To avoid this problem, this study proposes a novel method for collecting single cell suspensions from culture chambers for subculture using an ultrasonic pump driven by the squeeze film effect. First we developed a cell culture device consisting of a cell culture substrate with a piezoelectric ceramic disk glued to the back, so that we can elicit resonance vibration of the substrate...
April 28, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28461047/influence-of-cement-type-and-ceramic-primer-on-retention-of-polymer-infiltrated-ceramic-crowns-to-a-one-piece-zirconia-implant
#14
Nadja Rohr, Stefan Brunner, Sabrina Märtin, Jens Fischer
STATEMENT OF PROBLEM: The best procedure for cementing a restoration to zirconia implants has not yet been established. PURPOSE: The purpose of this in vitro study was to measure the retention of polymer-infiltrated ceramic crowns to zirconia 1-piece implants using a wide range of cements. The effect of ceramic primer treatment on the retention force was also recorded. The retention results were correlated with the shear bond strength of the cement to zirconia and the indirect tensile strength of the cements to better understand the retention mechanism...
April 28, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28456657/topography-of-calcium-phosphate-ceramics-regulates-primary-cilia-length-and-tgf-receptor-recruitment-associated-with-osteogenesis
#15
Jingwei Zhang, Melis Dalbay, Xiaoman Luo, Erik Vrij, Davide Barbieri, Lorenzo Moroni, Joost D de Bruijn, Clemens A van Blitterswijk, Paul Chapple, Martin M Knight, Huipin Yuan
The surface topography of synthetic biomaterials is known to play a role in material-driven osteogenesis. Recent studies show that TGFβ signaling also initiates osteogenic differentiation. TGFβ signaling requires the recruitment of TGFβ receptors (TGFβR) to the primary cilia. In this study, we hypothesize that the surface topography of calcium phosphate ceramics regulates stem cell morphology, primary cilia structure and TGFβR recruitment to the cilium associated with osteogenic differentiation. We developed a 2D system using two types of tricalcium phosphate (TCP) ceramic discs with identical chemistry...
April 26, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28456557/no-post-no-core-approach-to-restore-severely-damaged-posterior-teeth-an-up-to-10-year-retrospective-study-of-documented-endocrown-cases
#16
Marcia M Belleflamme, Sabine O Geerts, Marie M Louwette, Charlotte F Grenade, Alain J Vanheusden, Amélie K Mainjot
OBJECTIVES: The objectives of the present study were to (1) retrospectively evaluate documented cases of ceramic and composite endocrowns performed using immediate dentin sealing (IDS); (2) correlate failures with clinical parameters such as tooth preparation characteristics and occlusal parameters. METHODS: 99 documented cases of endocrowns were evaluated after a mean observation period of 44.7±34.6months. A classification of restorations was established in function of the level of damage of residual tooth tissues after preparation, from 1 to 3...
April 27, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28450675/the-effect-of-heat-treatments-applied-to-superstructure-porcelain-on-the-mechanical-properties-and-microstructure-of-lithium-disilicate-glass-ceramics
#17
Hatice Özdemir, Alper Özdoğan
The aim of this study was to investigate that heat treatments with different numbers applied to superstructure porcelain whether effects microstructure and mechanical properties of lithium disilicate ceramic (LDC). Eighty disc-shaped specimens were fabricated from IPS e.max Press. Specimens were fired at heating values of porcelain in different numbers and divided four groups (n=5). Initial Vickers hardness were measured and X-ray diffraction (XRD) analysis was performed. Different surface treatment were applied and then Vickers hardness, surface roughness and environmental scanning electron microscopy (ESEM) analysis were performed...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28443832/protective-buffering-capacity-of-restorative-dental-materials-in-vitro
#18
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
#19
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
#20
Jinhuan Ke, Fupo He, Jiandong Ye
Yttria-stabilized tetragonal zirconia (Y-TZP) has been proposed as a potential dental implant because of 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 layers of Y-TZP ceramics under different negative pressures (atmospheric pressure, -0...
May 5, 2017: ACS Applied Materials & Interfaces
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