scholarly journals In vitro bioactivity of biphasic calcium phosphate silicate glass-ceramic in CaO-SiO2-P2O5 system

2010 ◽  
Vol 4 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Lachezar Radev ◽  
Vladimir Hristov ◽  
Irena Michailova ◽  
Helena Fernandes ◽  
Miranda Salvado
Keyword(s):  
Glass Ceramic ◽  
Sol Gel ◽  
In Vitro Bioactivity ◽  
29Si Mas Nmr ◽  
Phosphate Silicate ◽  
Gel Technique ◽  
The One ◽  
Static Conditions ◽  
P2o5 System

The main purpose of the paper is the evaluation of the influence of chemical composition of the gel of the synthesized 15CaO?0.5P2O5-6SiO2 glass-ceramic on the structure, crystallization behaviour and in vitro bioactivity in static conditions for different periods of time - 3, 9 and 30 days in 1.5SBF. The obtained glass-ceramic was synthesized via polystep sol-gel technique. The structure of the prepared and the one thermally treated at 1200?C for 2 h powder was studied by XRD, 29Si MAS NMR, FTIR and SEM. .

In Vitro Bioactivity of AISI 316L Stainless Steel Coated with Hydroxyapatite-Seeded 58S Bioglass

MRS Advances ◽  
2019 ◽  
Vol 4 (57-58) ◽  
pp. 3133-3142 ◽  
Author(s):  
Jorge López-Cuevas ◽  
Juan Carlos Rendón-Angeles ◽  
Juan Méndez-Nonell ◽  
Héctor Barrientos-Rodríguez
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Sol Gel ◽  
Aisi 316L ◽  
In Vitro Bioactivity ◽  
Aisi 316L Stainless Steel ◽  
Gel Technique ◽  
Static Conditions ◽  
Steel Substrates

ABSTRACTAISI 316L stainless steel substrates were coated with hydroxyapatite [HAp, Ca10(PO4)6(OH)2]-seeded 58S bioglass, and then their in vitro bioactivity was evaluated by soaking in a simulated body fluid (SBF). The bioglass was prepared via the sol-gel technique and nanometric HAp single crystals were obtained by hydrothermal synthesis. The coatings had bioglass/HAp weight ratios of 100/0, 90/10 or 80/20. The in vitro bioactivity tests were carried out under static conditions at 37 °C and pH = 7.25, for time periods ranging from 1 to 21 days. The results showed that the HAp-seeding significantly accelerates the formation of a HAp layer at the bioglass-coated steel surface during the bioactivity tests.

scholarly journals In vitro bioactivity of Polyurethane/85S Bioglass composite scaffolds

2013 ◽  
Vol 11 (9) ◽  
pp. 1439-1446 ◽  
Author(s):  
Lachezar Radev ◽  
Darina Zheleva ◽  
Irena Michailova
Keyword(s):  
Sol Gel ◽  
Spherical Particles ◽  
Polymerization Reaction ◽  
In Vitro Test ◽  
In Vitro Bioactivity ◽  
Before And After ◽  
Vitro Test ◽  
Sbf Solution ◽  
Static Conditions

AbstractIn the present work Polyurethane (PU)/Bioglass (BG) composite materials were synthesized with different content of BG (10 and 20 mol.%) as filler. The 85S Bioglass was synthesized via polystep sol-gel method. The chemical composition of BG is 85SiO2-10CaO-5P2O5 (wt.%). The synthesis of PU was carried out by a two-step polyaddition reaction. The 85S BG was added in situ during the polymerization reaction. In vitro bioactivity of the prepared composites was examined in the presence of 1.5 SBF for 7 days in static conditions. The structure of synthesized PU/BG composites before and after in vitro test was determined by XRD, FTIR and SEM. XRD of the samples before in vitro test proved that the phase of γCa2P2O7 in the PU/20BG is visible. FTIR revealed the presence of urethane bond between OH-(from BG) and NCO groups (from PU). Based on FTIR results after in vitro test in 1.5 SBF solutions, A/B-carbonate containing hydroxyapatite (CO3HA) was formed. XRD proved that HA was formed on the surface of the samples, but Ca2P2O7 does not undergo any changes in the 1.5 SBF solution. SEM depicted the nano-HA agglomerated in spherical particles after immersion in 1.5 SBF for 7 days.

scholarly journals Quenched/unquenched nano bioactive glass-ceramics: Synthesis and in vitro bioactivity evaluation in Ringer’s solution with BSA

2013 ◽  
Vol 19 (2) ◽  
pp. 231-239 ◽  
Author(s):  
Nima Nabian ◽  
Maedeh Delavar ◽  
Mahmood Rabiee ◽  
Mohsen Jahanshahi
Keyword(s):  
Electron Microscope ◽  
Bioactive Glass ◽  
Glass Ceramic ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Apatite Formation ◽  
In Vitro Bioactivity ◽  
Sem Images ◽  
Transmission Electron

The paper reports the first attempt at changing cooling treatment of synthesizing method in order to investigate its effect on the physical properties of sol-gel derived nano bioactive glass-ceramic in the system 58SiO2-33CaO-9P2O5 (wt.%). We hypothesized that the method of cooling may affect the properties of nano bioactive glass-ceramic. To test this hypothesis, two different method of cooling treatment was applied after calcinations in synthesizing method. Both quenched and unquenched nano bioactive glass-ceramics were soaked in Ringer?s solution with bovine serum albumin (BSA) for bioactivity evaluation. The obtained samples were analyzed for their composition, crystalinity and morphology through X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), surface electron microscope (SEM) and transmission electron microscope (TEM). The SEM images showed that the morphology of nano bioactive glass-ceramics was completely changed by quenching process. Results of in vitro bioactivity evaluation revealed that the unquenched attains faster apatite formation ability than the quenched sample. Other properties of these two morphologically different nano bioactive glass-ceramics were strongly discussed.

scholarly journals In vitro bioactivity of 70 wt.% SiO2 — 30 wt.% CaO sol-gel glass, doped with 1, 3 and 5 wt.% NbF5

2012 ◽  
Vol 10 (1) ◽  
pp. 137-145 ◽  
Author(s):  
Lachezar Radev ◽  
Katia Hristova ◽  
Valery Jordanov ◽  
Maria Fernandes ◽  
Isabel Salvado
Keyword(s):  
Sol Gel ◽  
Active Role ◽  
In Vitro Test ◽  
In Vitro Bioactivity ◽  
Soaking Time ◽  
Vitro Test ◽  
Sbf Solution ◽  
Gel Glasses ◽  
Static Conditions

AbstractThe 70SiO2-30CaO (wt.%) sol-gel glasses doped with 1, 3 and 5 NbF5 (wt.%) were prepared via polystep sol-gel route. The synthesized glasses were characterized by XRD, FTIR and SEM. Changes in 1.5 SBF solutions were measured by ICP-AES. XRD of the glasses stabilized at 700°C for 6 hours proved the presence of niocalite. FTIR was consistent with XRD data. The in vitro bioactivity study of all glasses prepared were carried out by soaking in 1.5 simulated body fluid (1.5 SBF) at 37°C for 6 and 12 days in static conditions. The FTIR reveals the formation of A-type and B-type carbonate containing hydroxyapatite (CO3HA) layer. Changes in 1.5 SBF solutions, after 6 days of soaking, show that the Ca concentration increased significantly, compared to the initial Ca content in the 1.5 SBF solution before in vitro test. After 12 days of immersion, the Ca concentration decreased, i.e., the formation of HA phase consumed Ca from 1.5 SBF solution. For all soaking times, the concentration of P is much lower than that the used 1.5 SBF. Based on these results we suggest that Ca and P play an active role in the future of the glasses. SEM depicts that the different morphology of hydroxyapatite can be formed as a function of soaking time.

Novel Glass-Ceramics for Dental Application by Sol Gel Technique

2008 ◽  
Vol 396-398 ◽  
pp. 153-156 ◽  
Author(s):  
Xanthippi Chatzistavrou ◽  
E. Hatzistavrou ◽  
Nikolaos Kantiranis ◽  
Lambrini Papadopoulou ◽  
Eleana Kontonasaki ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Preparation Method ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Dental Restorations ◽  
Gel Technique ◽  
Gel Preparation ◽  
Dental Applications ◽  
Potential Use

The aim of this study was the fabrication using a sol-gel technique of a new glass-ceramic with potential use in dental applications. The characterization of the composition and microstructural properties of the produced material confirmed the similarity between the new sol-gel derived glass-ceramic and a commercial leucite based fluorapatite dental glass-ceramic. The produced material has potential application in dental restorations and it is expected to exhibit better control of composition, microstructure and properties due to the intrinsic advantages of the sol-gel preparation method.

Synthesis of sol-gel derived glass powder and in vitro bioactivity property tested in simulated body fluid

2016 ◽  
Author(s):  
S. A. Syed Nuzul Fadzli ◽  
S. Roslinda ◽  
Firuz Zainuddin ◽  
Hamisah Ismail
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Glass Powder ◽  
Sol Gel ◽  
In Vitro Bioactivity
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