Synthesis, characterization and strengthening mechanism of modified and unmodified porous diopside/baghdadite scaffolds

Sadeghzade, Sorour; Emadi, Rahmatollah; Ahmadi, Tahmineh; Tavangarian, Fariborz

doi:10.1016/j.matchemphys.2019.02.041

Cited by 32 publications

(22 citation statements)

References 48 publications

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“…Subsequently, absorbing phosphate groups with a negative charge can occur and lead to the formation of an apatite layer on the surface of akermanite [ 31 , 32 ]. The release of Ca 2+ , Mg 2+ , and Si 4+ ions from akermanite to the body environment, play an important role in cellular behavior [ 33 , 34 ]. Magnesium is an important mineral element in bone tissues and plays a key role in bone remodeling and skeletal development [ 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

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Fabrication, Mechanical Properties and In-Vitro Behavior of Akermanite Bioceramic

et al. 2020

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Pure nanocrystalline akermanite (Ca2MgSi2O7) powder was synthesized by mechanical activation with subsequent annealing of talc, calcium carbonate, and silicate powders as the initial materials. Powder samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) techniques. The results showed that pure nanocrystalline akermanite with a crystalline size of 35 nm was synthesized after ball milling the initial powders for 20 h with subsequent annealing at 900 °C for 1 h. Mechanical properties of bulk akermanite samples were studied as well. The results showed that the produced akermanite tablets sintered at 1200 °C for 5 h had a Young’s modulus of 3800 MPa, an ultimate compressive strength of 24.7 MPa, and a density of 2.489 g/cm3. The in-vitro behavior of the produced akermanite was evaluated by soaking the samples in an SBF solution. The results showed that the produced akermanite had the apatite formation ability on its surface and can be a good candidate for bone tissue engineering applications.

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Section: Resultsmentioning

confidence: 99%

“…There is a growing interest in the concept of silicon’s essential role in bone formation and maintenance. Silicon (Si) improves bone matrix quality and facilitates bone mineralization [ 33 , 34 ]. Silicon supplementation in human body increases bone mineral density and improve bone strength [ 31 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

Fabrication, Mechanical Properties and In-Vitro Behavior of Akermanite Bioceramic

et al. 2020

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“…As shown in previous studies, this ion exchange leads to the formation of a silanol group on the surface of implants. Afterward, phosphate groups and calcium ions are adsorbed and deposited on the implant surface in the form of calcium-phosphate compounds [42,43]. This stage of apatite formation reduces the pH value in the solution.…”

Section: Resultsmentioning

confidence: 99%

Bioactivity Behavior Evaluation of PCL-Chitosan-Nanobaghdadite Coating on AZ91 Magnesium Alloy in Simulated Body Fluid

et al. 2020

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Polymer-ceramic composite coatings on magnesium-based alloys have attracted lots of attention in recent years, to control the speed of degradability and to enhance bioactivity and biocompatibility. In this study, to decrease the corrosion rate in a simulated body fluid (SBF) solution for long periods, to control degradability, and to enhance bioactivity, polycaprolactone-chitosan composite coatings with different percentages of baghdadite (0 wt.%, 3 wt.%, and 5 wt.%) were applied to an anodized AZ91 alloy. According to the results of the immersion test of the composite coating containing 3 wt.% baghdadite in a phosphate buffer solution (PBS), the corrosion rate decreased from 0.45 (for the AZ91 sample) to 0.11 mg/cm 2 ·h after seven days of immersion. To evaluate the apatite formation capability of specimens, samples were immersed in an SBF solution. The results showed that the samples were bioactive as apatite layers formed on the surface of specimens. The composite coating containing 3 wt.% baghdadite showed the highest apatite-formation capability, with a controlled release of ions, and the lowest corrosion rate in the SBF.

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“…The scaffolds showed a high bioactivity and biocompatibility compared to hydroxyapatite scaffolds. In other studies, they reported [31,32] a high BMSC cell attachment, proliferation rate, and cell spreading on diopside/baghdadite scaffolds. Roohani-Esfahani et al [33] reported an extensive new bone formation in radial defect using baghdadite scaffolds, which was not observed in the β-tricalcium phosphate/hydroxyapatite scaffolds as control samples.…”

Section: Introductionmentioning

confidence: 86%

Applying Baghdadite/PCL/Chitosan Nanocomposite Coating on AZ91 Magnesium Alloy to Improve Corrosion Behavior, Bioactivity, and Biodegradability

et al. 2019

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Magnesium alloys have received a great amount of attention regarding being used in biomedical applications; however, they show high degradability, poor bioactivity, and biocompatibility. To improve these properties, surface modification and various types of coatings have been applied. In this study, an anodized AZ91 alloy was coated with a polymer matrix composite made of polycaprolactone/chitosan (PCL/Ch) with different percentages of baghdadite to improve its resistance to corrosion, bioactivity, and biocompatibility. The effects of different percentages of baghdadite (0 wt %, 1 wt %, 3 wt %, and 5 wt %) on the surface microstructure, corrosion resistance, roughness, and wettability were evaluated. The results indicated that the applied nano-polymer-ceramic coating including 3 wt % baghdadite was hydrophobic, which consequently increased the corrosion resistance and decreased the corrosion current density of the anodized AZ91 alloy. Coating with 3 wt % baghdadite increased the roughness of AZ91 from 0.329 ± 0.02 to 7.026 ± 0.31 μm. After applying the polymer-ceramic coating on the surface of anodized AZ91, the corrosion products changed into calcium–phosphate compounds instead of Mg(OH)2, which is more stable in a physiological environment.

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Synthesis, characterization and strengthening mechanism of modified and unmodified porous diopside/baghdadite scaffolds

Cited by 32 publications

References 48 publications

Fabrication, Mechanical Properties and In-Vitro Behavior of Akermanite Bioceramic

Fabrication, Mechanical Properties and In-Vitro Behavior of Akermanite Bioceramic

Bioactivity Behavior Evaluation of PCL-Chitosan-Nanobaghdadite Coating on AZ91 Magnesium Alloy in Simulated Body Fluid

Applying Baghdadite/PCL/Chitosan Nanocomposite Coating on AZ91 Magnesium Alloy to Improve Corrosion Behavior, Bioactivity, and Biodegradability

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