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https://www.readbyqxmd.com/read/28636267/strontium-releasing-fluorapatite-glass-ceramics-crystallization-behavior-microstructure-and-solubility
#1
Isabelle Denry, Ourania-Menti Goudouri, Jeffrey D Harless, E M Hubbard, Julie A Holloway
The purpose of this work was to investigate the effect of strontium partial replacement for calcium on the crystallization behavior, microstructure and solubility of fluorapatite glass-ceramics. Four glass compositions were prepared with increasing amounts of strontium partially replacing calcium. The crystallization behavior was analyzed by differential scanning calorimetry and X-ray diffraction (XRD). The microstructure was investigated by scanning electron microscopy. The chemical solubility was quantified according to ISO standard 10993-14...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28629020/a-comparative-in-vivo-evaluation-of-bioactive-glasses-and-bioactive-glass-based-composites-for-bone-tissue-repair
#2
Devis Bellucci, Alexandre Anesi, Roberta Salvatori, Luigi Chiarini, Valeria Cannillo
In this work a set of novel materials for bone tissue regeneration have been tested in vivo in an animal model. In fact, despite many studies have been devoted to amorphous 45S5 Bioglass®, there is lack in the literature of works aimed to study the in vivo performance of heat-treated - and thus partially crystallized - 45S5. As widely reported, crystallization limits the bioactivity of 45S5 and is the main reason that prevents a broader use of this material. Thus, in the present work, a recently developed bioactive glass (BG_Ca/Mix) is tested, since previous investigations demonstrated that BG_Ca/Mix is particularly promising by virtue of both its high bioactivity and lower tendency to crystallize with respect to 45S5...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28623725/a-new-route-to-the-stable-capture-and-final-immobilization-of-radioactive-cesium
#3
Jae Hwan Yang, Ahreum Han, Joo Young Yoon, Hwan-Seo Park, Yung-Zun Cho
Radioactive Cs released from damaged fuel materials in the event of nuclear accidents must be controlled to prevent the spreading of hazardous Cs into the environment. This study describes a simple and novel process to safely manage Cs gas by capturing it within ceramic filters and converting it into monolithic waste forms. The results of Cs trapping tests showed that CsAlSiO4 was a reaction product of gas-solid reactions between Cs gas and our ceramic filters. Monolithic waste forms were readily prepared from the Cs-trapping filters by the addition of a glass frit followed by thermal treatment at 1000°C for 3h...
June 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28614968/putty-like-bone-fillers-based-on-cap-ceramics-or-biosilicate%C3%A2-combined-with-carboxymethylcellulose-characterization-optimization-and-evaluation
#4
Paulo R Gabbai-Armelin, Ana Cm Renno, Murilo C Crovace, Angela Mp Magri, Edgar D Zanotto, Oscar Peitl, Sander Cg Leeuwenburgh, John A Jansen, Jeroen Jjp van den Beucken
Calcium phosphates and bioactive glass ceramics have been considered promising biomaterials for use in surgeries. However, their moldability should be further enhanced. We here thereby report the handling, physicochemical features, and morphological characteristics of formulations consisting of carboxymethylcellulose-glycerol and hydroxyapatite-tricalcium phosphate or Biosilicate® particles. We hypothesized that combining either material with carboxymethylcellulose-glycerol would improve handling properties, retaining their bioactivity...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28611368/variable-thermal-expansion-of-glass-ceramics-containing-ba1-xsrxzn2si2o7
#5
Christian Thieme, Martin Schlesier, Eze Oji Dike, Christian Rüssel
Up to now, the thermal expansion behavior of multiphase glass-ceramics cannot be predicted reliably because of the nescience about the formation of the type and concentration of crystalline phases. In the system BaO-SrO-ZnO-SiO2, recently a new phase based on Ba1-xSrxZn2Si2O7 solid solutions was found, which exhibits unexpected low and highly anisotropic thermal expansion, which can be used for an adjustment of the thermal expansion properties. In the case of sealing materials for high-temperature reactors, the formation of this phase should be avoided...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28610395/tm-3-modified-optical-temperature-behavior-of-transparent-er-3-doped-hexagonal-nagdf4-glass-ceramics
#6
Chengqi E, Yanyan Bu, Lan Meng, Xiaohong Yan
Er(3+)-doped and Er(3+)-Tm(3+)-co-doped transparent hexagonal NaGdF4 glass ceramics are fabricated via melt-quenching method. The emissions of Er(3+)-doped NaGdF4 glass ceramics are adjusted from the green to red by varying the concentration of Tm(3+) ion under the excitation of 980 nm. The spectrum, thermal quenching ratio, fluorescence intensity ratios, and optical temperature sensitivity of the transparent glass ceramics are observed to be dependent on the pump power. The maximum value of relative sensitivity reaches 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28605611/short-and-long-term-bond-strength-between-resin-cement-and-glass-ceramic-using-a-silane-containing-universal-adhesive
#7
F Murillo-Gómez, F A Rueggeberg, M F De Goes
This study aimed to evaluate the effect of various silane-containing solutions on bonding between resin cement and glass ceramic after 24 hours and after six months of water storage. Glass-ceramic plaques (IPS e.max CAD) were sandblasted with aluminum oxide, etched with 10% hydrofluoric acid (HF), and divided into five "silane treatment" groups: RelyX Ceramic Primer (RCP), RelyX Ceramic Primer and Single Bond Plus (RCP+SB), Scotchbond Universal (SBU), Clearfil Ceramic Primer (CP), and no solution (HF-only control)...
June 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28598153/molecular-precursors-for-zno-nanoparticles-field-assisted-synthesis-electrophoretic-deposition-and-field-effect-transistor-device-performance
#8
Rudolf C Hoffmann, Shawn Sanctis, Jörg J Schneider
Zinc complexes with multidentate Schiff base ligands are suitable precursors for ZnO in microwave-assisted transformation reactions. [Bis(acetylacetonato)ethylenediimine]zinc(II) and [bis(methylacetoacetato)ethylenediimine]zinc(II) have been synthesized with high purity and good yield from the direct reaction of the respective diimine ligand with diethylzinc in tetrahydrofuran. The thermal decay is studied by thermogravimetry coupled with online infrared spectroscopy. The ceramization reaction in ethoxyethanol yields stable dispersions of spherical ZnO nanoparticles with very small particle sizes (around 5-6 nm), which can be employed for coating and thin-film deposition processes...
June 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28595102/a-comparative-study-of-progressive-wear-of-four-dental-monolithic-veneered-glass-ceramics
#9
Zhenzhen Zhang, Yuanping Yi, Xuesong Wang, Jiawen Guo, Ding Li, Lin He, Shaofeng Zhang
OBJECTIVES: This study evaluated the wear performance and wear mechanisms of four dental glass-ceramics, based on the microstructure and mechanical properties in the progressive wear process. METHODS: Bar (N = 40, n = 10) and disk (N = 32, n = 8) specimens were prepared from (A) lithium disilicate glass-ceramic (LD), (B) leucite reinforced glass-ceramic (LEU), (C) feldspathic glass-ceramic (FEL), and (D) fluorapatite glass-ceramic (FLU). The bar specimens were tested for three-point flexural strength, hardness, fracture toughness and elastic modulus...
May 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28590094/optical-properties-and-failure-load-of-thin-cad-cam-ceramic-veneers
#10
Henriika Maunula, Jenni Hjerppe, Lippo L V Lassila, Timo O Närhi
This study aimed to compare optical properties and failure load of leucite (IPS Empress CAD LT) and lithium disilicate glass ceramic (IPS e.max CAD LT) materials in incisor veneers. Four groups of veneers were made on 36 bovine incisors with Cerec 3D milling unit (n=9/group): 0.5 and 0.3 mm thick leucite glass and 0.5 and 0.3 mm lithium disilicate glass veneers. The optical features were measured with CM-700d spectrophotometer using white and yellow try-in pastes. Differences were determined by means of ΔE value and luminance...
June 2017: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28589920/systematic-evaluation-of-the-osteogenic-capacity-of-low-melting-bioactive-glass-reinforced-45s5-bioglass-porous-scaffolds-in-rabbit-femoral-defects
#11
Lei Zhang, Xiurong Ke, Lingzhi Lin, Jun Xiao, Xianyan Yang, Juncheng Wang, Guojing Yang, Sanzhong Xu, Zhongru Gou, Zhanjun Shi
Due to the low strength and high brittleness of 45S5 Bioglass(®), it is still a great challenge for the three-dimensional porous 45S5 Bioglass(®) to treat mechanically required loaded bone defects. Therefore, 45S5 Bioglass(®)-derived bioactive glass-ceramic (BGC) porous scaffolds were fabricated at a low temperature sintering condition with and without the addition of 4% low-melting ZnO/B2O3 (ZB) bioactive glass as a reinforcing agent and using 350- or 500 μm paraffin microspheres as a porogen. The pore structure characterization for the scaffolds indicated that the scaffolds containing 4% ZB had very good macroporous structures of ∼313 and ∼448 μm in pore size and over 70% porosity with appreciable strength (>15 MPa), which was about four times higher than that those manufactured without ZB and with 350 μm porogen scaffolds...
June 7, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28584779/evaluation-of-surface-roughness-of-different-direct-resin-based-composites
#12
Nashaat Mohammed Magdy, Mohammed Zaheer Kola, Hamod Hussain Alqahtani, Mubarak Daghash Alqahtani, Abdullah Saud Alghmlas
AIMS AND OBJECTIVE: To evaluate surface roughness of different resin-based composites. MATERIALS AND METHODS: Three resin composites, one nanohybrid, one nanoceramic, and one bulk-fill resin-based composite, were used in this study. Cylindrical Teflon mold and 8 mm in diameter and 2 mm in thickness disc specimens were prepared. For each composite material, 15 discs were fabricated, with a total of sixty discs were obtained (n = 60). A glass slide 1-2 mm thick was placed over the strip before curing with the light-curing unit to flatten the surfaces...
May 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28578984/comparison-of-dimensional-accuracy-of-conventionally-and-digitally-manufactured-intracoronal-restorations
#13
Reza Eftekhar Ashtiani, Leila Nasiri Khanlar, Minoo Mahshid, Alireza Moshaverinia
STATEMENT OF PROBLEM: Advances have been made in digital dentistry for the fabrication of dental prostheses, but evidence regarding the efficacy of digital techniques for the fabrication of intracoronal restorations is lacking. PURPOSE: The purpose of this in vitro study was to compare the dimensional accuracy of intracoronal restorations fabricated with digital and conventional techniques. MATERIAL AND METHODS: A sound mandibular molar tooth received a standard onlay preparation, and onlays were fabricated with 1 of 3 fabrication techniques...
June 2, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28576056/new-infrared-assisted-method-for-sol-gel-derived-zno-ag-thin-films-structural-and-bacterial-inhibition-properties
#14
Brenely González-Penguelly, Ángel de Jesús Morales-Ramírez, Miriam Guadalupe Rodríguez-Rosales, Celestino Odín Rodríguez-Nava, María Luz Carrera-Jota
A new sol-gel method, based on crystallization with Infrared heating, was developed to obtain ZnO:Ag thin films. The common sol, with zinc acetate as precursor and silver nitrate as doping source (1, 3 and 5 % molar), isopropanol and distilled water as solvents and monoethanolamine as stabilizer agent; was modified with Pluronic F127 and diethylene glycol as rheological agents, and with urea as fuel to produce enough energy to the combustion and to promote the crystallization process. Later, Corning glass-substrates were dipped into the sol at a constant speed of 3mms(-1)...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28574390/clinical-protocols-preparation-impression-and-bonding-of-all-ceramic-glass-based-disilicate-lithium-crowns-review-and-case-report
#15
D Vadachkoria, O Vadachkoria
Using contemporary materials and techniques, nowadays we can offer the patients much needed restorations while achieving the desired aesthetics. The maxillary incisors are supremely important in the appearance of a smile. By establishing proper size, contours, vitality, translucency and relationship with the surrounding teeth and soft tissue, we can help create the smile of their dream. In modern dentistry, there are two major recent developments - the dentine bonding and stronger all-ceramic crown systems...
April 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28573977/bioactive-glass-ceramic-with-two-crystalline-phases-bios-2p-for-bone-tissue-engineering
#16
Emanuela Ferraz, Gileade Freitas, Murilo Crovace, Oscar Peitl, Edgar Zanotto, Paulo Tambasco de Oliveira, Marcio Mateus Beloti, Adalberto Rosa
We aimed to evaluate the in vitro osteogenic and osteoinductive potentials of BioS-2P and its ability to promote in vivo bone repair. To investigate osteogenic potential, UMR-106 osteoblastic cells were cultured on BioS-2P and Bioglass 45S5 discs in osteogenic medium. The osteoinductive potential was evaluated using mesenchymal stem cells (MSCs) cultured on BioS-2P, Bioglass 45S5 and polystyrene in non-osteogenic medium. Rat bone calvarial defects were implanted with BioS-2P scaffolds alone or seeded with MSCs...
June 2, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28570937/recent-advancements-in-supporting-materials-for-immobilised-photocatalytic-applications-in-waste-water-treatment
#17
REVIEW
B Srikanth, R Goutham, R Badri Narayan, A Ramprasath, K P Gopinath, A R Sankaranarayanan
The aim of this paper is to provide a review on the usage of different anchoring media (supports) for immobilising commonly employed photocatalysts for degradation of organic pollutants. The immobilisation of nano-sized photocatalysts can eliminate costly and impractical post-treatment recovery of spent photocatalysts in largescale operations. Some commonly employed immobilisation aids such as glass, carbonaceous substances, zeolites, clay and ceramics, polymers, cellulosic materials and metallic agents that have been previously discussed by various research groups have been reviewed...
May 29, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28570023/strength-toughness-and-reliability-of-a-porous-glass-biopolymer-composite-scaffold
#18
Qiang Fu, Weitao Jia, Grace Y Lau, Antoni P Tomsia
Development of bioactive glass and ceramic scaffolds intended for the reconstruction of large segmental bone defects remains a challenge for materials science due to the complexities involved in clinical implantation, bone-implant reaction, implant degradation and the multiple loading modes the implants subjected to. A comprehensive evaluation of the mechanical properties of inorganic scaffolds and exploration of new ways to toughen brittle constructs are critical prior to their successful application in loaded sites...
June 1, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28569445/can-cleansing-regimens-effectively-eliminate-saliva-contamination-from-lithium-disilicate-ceramic-surface
#19
Alexandre L S Borges, Sumana Posritong, Mutlu Özcan, Fernanda Campos, Renata Melo, Marco C Bottino
This study evaluated the effect of cleaning protocols on the bond strength of resin cement to glass-ceramic. Ceramic specimens (N=120, n=12 per group) were etched with hydrofluoric acid and rinsed with water. After saliva contamination, specimens were cleaned as follows: water, 37% H3PO4, cleaning-paste (Ivoclean), or isopropanol. Non-contaminated specimens acted as the control. Resin cement was bonded to the specimens, and tested either after 24 h or x5000 thermocycling. Both the cleaning method (p=0.001) and the storage conditions (p=0...
March 2017: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28567530/immediate-definitive-individualized-abutments-reduce-peri-implant-bone-loss-a-randomized-controlled-split-mouth-study-on-16-patients
#20
M Erhan Çömlekoğlu, Nejat Nizam, Mine Dündar Çömlekoğlu
OBJECTIVES: This paper aims to observe peri-implant time-related vertical bone level and soft tissue changes with immediate, non-detached glass-ceramic (lithium-disilicate) individualized abutments and dis-/reconnections. MATERIALS AND METHODS: Sixteen split-mouth patients received provisionalized immediate definitive individualized abutments (test T) versus dis-/reconnected individualized abutments (control C). In group T, digital impressions were made by using titanium bases (Conelog, Camlog), and individualized abutments (E...
May 31, 2017: Clinical Oral Investigations
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