Formation of hydroxyapatite onto glasses of the CaO–MgO–SiO2 system with B2O3, Na2O, CaF2 and P2O5 additives

Agathopoulos, Simeon; Tulyaganov, Dilshat U.; Ventura, J.M.G.; Kannan, S.; Karakassides, Michael A.; Ferreira, J.M.F.

doi:10.1016/j.biomaterials.2005.10.033

Cited by 158 publications

(82 citation statements)

References 45 publications

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“…The contribution of P-O bond vibrations (elicited by the orthophosphate functional groups, Q P 0 , which are typically the dominant phosphate environment in such glass compositions), 50 is hard to deduce, due to the low P content of the films and to the superimposition of the highest-intensity IR bands of phosphate with those of silicate. 40 As expected, the gradual increase in the silica content of the BG-3S and BG-5S films was reflected in an augmentation of the polymerization degree of the films' glass network. FTIR spectra (Figure 4) indicated an intensity enhancement of ), determined by the Q Si 4 silicate units.…”

Section: Characterization Of Starting Bg Powder and As-sputtered Bg Csupporting

confidence: 65%

Bioglass implant-coating interactions in synthetic physiological fluids with varying degrees of biomimicry

Popa¹,

Stan²,

Husanu³

et al. 2017

IJN

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Synthetic physiological fluids are currently used as a first in vitro bioactivity assessment for bone grafts. Our understanding about the interactions taking place at the fluid–implant interface has evolved remarkably during the last decade, and does not comply with the traditional International Organization for Standardization/final draft International Standard 23317 protocol in purely inorganic simulated body fluid. The advances in our knowledge point to the need of a true paradigm shift toward testing physiological fluids with enhanced biomimicry and a better understanding of the materials’ structure-dissolution behavior. This will contribute to “upgrade” our vision of entire cascades of events taking place at the implant surfaces upon immersion in the testing media or after implantation. Starting from an osteoinductive bioglass composition with the ability to alleviate the oxidative stress, thin bioglass films with different degrees of polymerization were deposited onto titanium substrates. Their biomineralization activity in simulated body fluid and in a series of new inorganic–organic media with increasing biomimicry that more closely simulated the human intercellular environment was compared. A comprehensive range of advanced characterization tools (scanning electron microscopy; grazing-incidence X-ray diffraction; Fourier-transform infrared, micro-Raman, energy-dispersive, X-ray photoelectron, and surface-enhanced laser desorption/ionization time-of-flight mass spectroscopies; and cytocompatibility assays using mesenchymal stem cells) were used. The information gathered is very useful to biologists, biophysicists, clinicians, and material scientists with special interest in teaching and research. By combining all the analyses, we propose herein a step forward toward establishing an improved unified protocol for testing the bioactivity of implant materials.

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Section: Characterization Of Starting Bg Powder and As-sputtered Bg Csupporting

confidence: 65%

Bioglass implant-coating interactions in synthetic physiological fluids with varying degrees of biomimicry

Popa¹,

Stan²,

Husanu³

et al. 2017

IJN

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“…2b, BG) is in good agreement with the NMR results. It shows that the network is mostly dominated by Q [2] units, which exhibit a strong band at 950 cm ) were also evident, although with low intensity [16]. Interestingly, the Q [2] band at 950 cm −1 disappeared upon mixing the BG powder with glycerol in the Gly-BG biocomposite (Fig.…”

Section: Resultsmentioning

confidence: 97%

Tailoring the viscoelastic properties of injectable biocomposites: A spectroscopic assessment of the interactions between organic carriers and bioactive glass particles

et al. 2016

Self Cite

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Injectable bioglass (BG) pastes were produced using a melt-quenched glass based on CaO-MgO-SiO 2 -Na 2 O-P 2 O 5 -CaF 2 and two organic carriers, namely polyethylene glycol (PEG) and glycerol (Gly). The interactions between the organic carriers and the surface of the BG particles were assessed by spectroscopic methods (Fourier Transform Infrared, Raman, as well as 29Si and 13C solid-state NMR spectroscopy) in order to understand their effects on the viscoelastic properties of the biocomposites. While pure physical interactions were detected between PEG and the surface of the BG particles, chemical bonding was observed between glycerol and BG, enhancing the network cross-linking degree. Accordingly, the BG network of Gly-BG pastes was more condensed (higher fraction of Q [3] units detected by Raman spectroscopy) in comparison to that of PEG-BG and bare BG. Such chemical interactions between the organic carrier and BG were shown to negatively affect the viscoelastic behaviour of the resulting pastes. Thus, the PEG-based biocomposite exhibited improved flowability in comparison to its analogous Gly-BG biocomposite.

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“…Those from 560, 692 and 792 cm À1 , could be assigned to bending mode of PØP Q 3 , Q 2 , Q 1 and Q 0 units (550-600 cm À1 ) and to symmetric stretching bands of PØP Q 3 , Q 2 and Q 1 units (650-800 cm À1 ), respectively. The spectra of the 750 8C annealed film display also a clear 1100 cm À1 asymmetric stretching band characteristic to (PO 3 ) present in Q 1 units [28][29][30][31][32][33]. By increasing the annealing temperature a sharp band at 670 cm À1 was evidenced, very weak at 550 8C and strong at 750 8C.…”

Section: Resultsmentioning

confidence: 99%

Effect of annealing upon the structure and adhesion properties of sputtered bio-glass/titanium coatings

Stan

Morosanu

Marcov

et al. 2009

Applied Surface Science

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Formation of hydroxyapatite onto glasses of the CaO–MgO–SiO2 system with B2O3, Na2O, CaF2 and P2O5 additives

Cited by 158 publications

References 45 publications

Bioglass implant-coating interactions in synthetic physiological fluids with varying degrees of biomimicry

Bioglass implant-coating interactions in synthetic physiological fluids with varying degrees of biomimicry

Tailoring the viscoelastic properties of injectable biocomposites: A spectroscopic assessment of the interactions between organic carriers and bioactive glass particles

Effect of annealing upon the structure and adhesion properties of sputtered bio-glass/titanium coatings

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