Evaluation of the Bioactivity Behavior of a 48 Wt %SiO2 Bioglass through Experiments in Simulated Body Fluid

2012 ◽  
Vol 727-728 ◽  
pp. 1238-1242 ◽  
Author(s):  
Roger Borges ◽  
Antônio Carlos da Silva ◽  
Juliana Marchi
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Glass Network ◽  
In Vitro Experiments ◽  
High Corrosion Resistance ◽  
Before And After ◽  
O 19

Among bioceramics materials, bioglasses which exhibits either a bioactive or resorbable behavior has been studied for many applications, such as bone substitutive and regeneration. When in contact with body fluid, the bioglasses can induce the formation of a hydroxyapatite surface layer. In this paper, we studied the bioactivity of a bioglass containing 48 wt %SiO2, 27 wt% Na2O, 19 wt % CaO and 6 wt %P2O5. After fusion and annealing, the samples were immersed in SBF for different periods, up to 14 days. The samples were characterized through XRD, DRIFT and SEM before and after bioactivity experiments. The overall results suggest the formation of a surface layer of consisting of hydroxyapatite, which was crystallized within seven days after in vitro experiments, leading to a suitable bioactivity. Moreover, the samples showed a glass network with high cohesion due to calcium addition, leading to materials with high corrosion resistance.

Studies on Development, Bioactivity and Corrosion Behaviour of Nanostructured Titania/Hydroxyapatite Composite Layer on Cp Ti

2011 ◽  
Vol 471-472 ◽  
pp. 325-330 ◽  
Author(s):  
K. Venkateswarlu ◽  
N. Rameshbabu ◽  
Arumugam Chandra Bose ◽  
V. Muthupandi ◽  
S. Subramanian
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Composite Layer ◽  
In Vitro Bioactivity ◽  
X Ray ◽  
Composite Layers ◽  
Cp Ti ◽  
Nanostructured Titania

Nanostructured titania/hydroxyapatite (HA) composite layer was developed on commercially pure titanium (Cp Ti) implant material by plasma electrolytic processing (PEP) technique in order to improve its bioactivity and corrosion resistance under physiological conditions. The phases present in the developed composite layer were studied by X-ray diffraction (XRD) technique. The surface morphology and thickness of the composite layers were observed by scanning electron microscopy (SEM). The corrosion characteristics of the developed layer were studied by potentiodynamic polarization scan under simulated body fluid (7.4 pH Hanks solution) and simulated osteoclast (4.5 pH) conditions. The in-vitro bioactivity of the composite layers was studied by using Kokubu’s simulated body fluid (SBF) solution. The X-ray diffractograms reveal the presence of anatase TiO2 and HA phases in the developed layer. The SEM results confirm the pore-free morphology of the implant material surface and the thickness of the developed composite layer was observed to be 110 ± 5 µm for 12 min of PEP. The potentiodynamic polarization study shows an improved corrosion resistance and the in-vitro bioactivity test results indicate enhanced apatite forming ability of PEP treated Cp Ti surfaces compared to that of the untreated Cp Ti, under simulated body fluid conditions.

Effect of nano-hydroxyapatite and dutycycle on the structure and corrosion performance of plasma electrolyte oxidation coatings in simulated body fluid on Ti–6Al–4 V

2018 ◽  
Vol 232 (23) ◽  
pp. 4229-4236 ◽  
Author(s):  
B Barooghi ◽  
M Sheikhi ◽  
A Amiri
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Duty Cycle ◽  
Body Fluid ◽  
Oxide Coatings ◽  
High Concentration ◽  
Plasma Electrolyte ◽  
Plasma Electrolyte Oxidation ◽  
Electrolyte Oxidation

The formation of titanium oxide coatings on Ti–6Al–4 V substrates by plasma electrolyte oxidation and the corrosion behavior of coatings in simulated body fluid were investigated. The effect of the addition of nano-hydroxyapatite particles to electrolyte and duty cycle of plasma electrolyte oxidation on the coating thickness and its surface morphology was studied. Phase structure and morphology of coated parts were studied using X-ray diffraction patterns and scanning electron microscopy. Wear and corrosion resistance were compared in coated and uncoated samples. Biocompatibility of coating was investigated using in vitro immersion in simulated body fluid. It was found that the plasma electrolyte oxidation forms dense and compact oxide coatings with slightly porous outer layers. Formation of apatite phase on the surface of coated samples was examined after immersion in simulated body fluid for two weeks. The corrosion resistance of plasma electrolyte oxidation coatings formed in electrolyte with high concentration of nano-hydroxyapatite and high duty cycle (60%) is better than the corrosion resistance of plasma electrolyte oxidation coatings formed in other electrolytes. Energy-dispersive spectroscopy results indicate the formation of a complete and preservative coating on Ti base materials.

Biodegradable Behaviors in Simulated Body Fluid of Mg-Gd-Y-Zr Alloy with Micro-Arc Oxide Coating

2013 ◽  
Vol 747-748 ◽  
pp. 295-300
Author(s):  
Kai Yang Yin ◽  
Tian Feng Lu ◽  
Qing Dong ◽  
Bing Yi Sun ◽  
Bin Chen
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Oxide Coating ◽  
Volume Measurement ◽  
Before And After ◽  
Micro Arc Oxidation ◽  
Weight Loss Method ◽  
Loss Method

The effects of micro-arc oxidation (MAO) on corrosion resistance of Mg-Gd-Y-Zr magnesium alloy have been studied. The Mg-Gd-Y-Zr with thicker oxide coating presented higher corrosion resistance in simulated body fluid (SBF). The corrosion rates were measured by several methods including hydrogen evolution volume measurement, weight-loss method and determination of pH as an auxiliary reference. The surfaces of specimens were observed by SEM and white light confocal microscopy before and after the corrosion. Besides the effects of MAO, the pitting resulted from breakage of oxide coating played a notable role as well. This provided a new direction towards the enhancement of corrosion resistance of magnesium alloy.

Biotribological Behavior of Boronized Tungsten

2005 ◽  
Author(s):  
S. Ingole ◽  
R. Ribeiro ◽  
O. Juan ◽  
H. Liang ◽  
M. Usta ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Wear Mechanisms ◽  
Body Fluid ◽  
Wear Behavior ◽  
High Strength ◽  
High Corrosion Resistance ◽  
Atomic Force ◽  
Pin On Disc ◽  
Wear Tests

Boronized tungsten is one of the potential biomaterials due to its high corrosion resistance, and high strength. Present investigation encompasses the wear behavior of this material in dry condition as well as in simulated body fluid (SBF). The pin-on-disc reciprocating tribometer was utilized to conduct the wear tests. The worn surfaces were analyzed using an atomic force microscope (AFM). Results showed that not only the SBF reduces the friction, but also shortens the initial break-in period. This presentation discusses the wear mechanisms of boronized tungsten affected by SBF.

IN-VITRO BEHAVIOUR OF BIPHASIC CALCIUM PHOSPHATE WITH DIFFERENT RATIO OF SILICA CONTENT IN SIMULATED BODY FLUID

2015 ◽  
Vol 23 (1) ◽  
pp. 1-14
Author(s):  
Sudirman Sahid ◽  
◽  
Nor Shahida Kader Bashah ◽  
Salina Sabudin ◽  
◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Biphasic Calcium Phosphate ◽  
Silica Content

scholarly journals Tetracalcium Phosphate/Monetite/Calcium Sulfate Hemihdrate Biocement Powder Mixtures Prepared by the One-Step Synthesis for Preparation of Nanocrystalline Hydroxyapatite Biocement-Properties and In Vitro Evaluation

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2137
Author(s):  
Lubomir Medvecky ◽  
Maria Giretova ◽  
Radoslava Stulajterova ◽  
Lenka Luptakova ◽  
Tibor Sopcak
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Calcium Sulfate ◽  
Powder Mixtures ◽  
Liquid Component ◽  
Tetracalcium Phosphate ◽  
Nanocrystalline Hydroxyapatite ◽  
One Step ◽  
Calcium Sulfate Hemihydrate

A modified one-step process was used to prepare tetracalcium phosphate/monetite/calcium sulfate hemihydrate powder cement mixtures (CAS). The procedure allowed the formation of monetite and calcium sulfate hemihydrate (CSH) in the form of nanoparticles. It was hypothesized that the presence of nanoCSH in small amounts enhances the in vitro bioactivity of CAS cement in relation to osteogenic gene markers in mesenchymal stem cells (MSCs). The CAS powder mixtures with 15 and 5 wt.% CSH were prepared by milling powder tetracalcium phosphate in an ethanolic solution of both orthophosphoric and sulfuric acids. The CAS cements had short setting times (around 5 min). The fast setting of the cement samples after the addition of the liquid component (water solution of NaH2PO4) was due to the partial formation of calcium sulfate dihydrate and hydroxyapatite before soaking in SBF with a small change in the original phase composition in cement powder samples after milling. Nanocrystalline hydroxyapatite biocement was produced by soaking of cement samples after setting in simulated body fluid (SBF). The fast release of calcium ions from CAS5 cement, as well as a small rise in the pH of SBF during soaking, were demonstrated. After soaking in SBF for 7 days, the final product of the cement transformation was nanocrystalline hydroxyapatite. The compressive strength of the cement samples (up to 30 MPa) after soaking in simulated body fluid (SBF) was comparable to that of bone. Real time polymerase chain reaction (RT-PCR) analysis revealed statistically significant higher gene expressions of alkaline phosphatase (ALP), osteonectin (ON) and osteopontin (OP) in cells cultured for 14 days in CAS5 extract compared to CSH-free cement. The addition of a small amount of nanoCSH (5 wt.%) to the tetracalcium phosphate (TTCP)/monetite cement mixture significantly promoted the over expression of osteogenic markers in MSCs. The prepared CAS powder mixture with its enhanced bioactivity can be used for bone defect treatment and has good potential for bone healing.

scholarly journals Preparation and Degradation Characteristics of MAO/APS Composite Bio-Coating in Simulated Body Fluid

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 667
Author(s):  
Zexin Wang ◽  
Fei Ye ◽  
Liangyu Chen ◽  
Weigang Lv ◽  
Zhengyi Zhang ◽  
...  
Keyword(s):  
Simulated Body Fluid ◽  
Composite Coating ◽  
Body Fluid ◽  
Composite Coatings ◽  
Degradation Process ◽  
Ceramic Coatings ◽  
Immersion Test ◽  
Substrate Material ◽  
Atmospheric Plasma

In this work, ZK60 magnesium alloy was employed as a substrate material to produce ceramic coatings, containing Ca and P, by micro-arc oxidation (MAO). Atmospheric plasma spraying (APS) was used to prepare the hydroxyapatite layer (HA) on the MAO coating to obtain a composite coating for better biological activity. The coatings were examined by various means including an X-ray diffractometer, a scanning electron microscope and an energy spectrometer. Meanwhile, an electrochemical examination, immersion test and tensile test were used to evaluate the in vitro performance of the composite coatings. The results showed that the composite coating has a better corrosion resistance. In addition, this work proposed a degradation model of the composite coating in the simulated body fluid immersion test. This model explains the degradation process of the MAO/APS coating in SBF.

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