Structural, thermal, morphological and dielectric investigations on 45S5 glass and glass-ceramics

Gavinho, Sílvia Rodrigues; Graça, M.P.F.; Prezas, P.R.; Kumar, Jitendra; Melo, B. M. G.; Sales, A. J. M.; Almeida, Ana Fabíola Leite; Valente, M. A.

doi:10.1016/j.jnoncrysol.2021.120780

Cited by 19 publications

(6 citation statements)

References 31 publications

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“…The XRD patterns, illustrated in Figure 1 , consist of typical broad bands, without traces of crystalline phases, which confirm the amorphous character of the glasses. These results match well with the ones reported in the literature for 45S5 glasses [ 3 , 46 ]. The insertion of niobium, up to 8% mole of Nb 2 O 5 , did not promote the formation of any crystalline phase but enlarged the band at smaller angles.…”

Section: Resultssupporting

confidence: 92%

“…The uncertainty in these measurements is 2%. In a prior study, a comparable thermal response was observed for the 45S5 bioglass [ 3 ]. The critical temperatures of the bioglasses modified by Nb 2 O 5 are reported in Table 1 .…”

Section: Resultssupporting

confidence: 60%

“…The existence of NBO ions could affect the electrical properties of the prepared glasses. It is known that in the bioactive glass system, the conductivity is mainly related to the energy transported by Na + and Ca + ions moving through the glass network [ 3 , 77 ]. For the glasses modified with Nb 2 O 5, the presence of NbO 6 units leads to the degradation of the bioglass network by the formation of more NBO ions.…”

Section: Discussionmentioning

confidence: 99%

“…The statistics in 2010 revealed more than 300,000 dental implants placed per year [ 2 ]. The clinical success of dental implants is related to their ability to ensure rapid osteointegration and prevent the development of peri-implantitis [ 3 ]. These conditions are essential to ensure the long-term success of the implant.…”

Section: Introductionmentioning

confidence: 99%

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Extensive Investigation on the Effect of Niobium Insertion on the Physical and Biological Properties of 45S5 Bioactive Glass for Dental Implant

Hammami

Gavinho

Pádua

et al. 2023

IJMS

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Dental implants have emerged as one of the most consistent and predictable treatments in the oral surgery field. However, the placement of the implant is sometimes associated with bacterial infection leading to its loss. In this work, we intend to solve this problem through the development of a biomaterial for implant coatings based on 45S5 Bioglass® modified with different amounts of niobium pentoxide (Nb2O5). The structural feature of the glasses, assessed by XRD and FTIR, did not change in spite of Nb2O5 incorporation. The Raman spectra reveal the Nb2O5 incorporation related to the appearance of NbO4 and NbO6 structural units. Since the electrical characteristics of these biomaterials influence their osseointegration ability, AC and DC electrical conductivity were studied by impedance spectroscopy, in the frequency range of 102–106 Hz and temperature range of 200–400 K. The cytotoxicity of glasses was evaluated using the osteosarcoma Saos-2 cells line. The in vitro bioactivity studies and the antibacterial tests against Gram-positive and Gram-negative bacteria revealed that the samples loaded with 2 mol% Nb2O5 had the highest bioactivity and greatest antibacterial effect. Overall, the results showed that the modified 45S5 bioactive glasses can be used as an antibacterial coating material for implants, with high bioactivity, being also non-cytotoxic to mammalian cells.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extensive Investigation on the Effect of Niobium Insertion on the Physical and Biological Properties of 45S5 Bioactive Glass for Dental Implant

Hammami

Gavinho

Pádua

et al. 2023

IJMS

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“…[37] The modulus formalism (M * Þ was also used to analyze the contribution of the bulk for the dielectric behav-iour because it minimizes the interface capacitance contribution at low frequencies. [38,39]…”

Section: Area Of Crystallinity Peaks Area Of All Peaksmentioning

confidence: 99%

Extraction, Purification and Electrical Characterization of Gross Galactomannan and Purified Galactomannan Obtained from Adenanthera pavonina L. Seeds

Neto

Pereira

Cavalcante

et al. 2023

Chemistry & Biodiversity

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Aiming of self-sustainable production, the search for biodegradable and biocompatible materials has brought with it the need to know the physicochemical and dielectric characteristics of polysaccharide-based composite structures, which can be used as important and promising raw materials for biotechnology and electronic industries. Galactomannans are polysaccharides, extracted from seeds and microbiological sources, consisting of mannose and galactose. In this context, this work aimed to extract, purify and characterize by XRD, FTIR and impedance spectroscopy galactomannan obtained from seeds of Adenanthera pavonina L. The purification process was made with ethyl alcohol at concentrations of 70, 80 and 90 %. Polymeric films were prepared by solvent slow evaporation at low temperatures. XRD measurements revealed that Galactomannan from Adenanthera pavonina L., after purification, has a semi-crystalline structure due to the identification of two peaks the first between 5.849°and 6.118°and the second between 20.011°and 20.247°. FTIR spectra showed the functional groups associated with monosaccharides of the galactomannan from Adenanthera pavonina L. seeds, as well as the typical polysaccharide bands and peaks, confirmed by literature data. The impedance results give an increment on the state-of-the-art of this biomaterial by showing the existence of dielectric relaxations, independent of the degree of purification, using the dielectric modulus formalism. The permittivity analysis reveals the presence of water in the structure of the film, whose dipoles contribute to the relatively high value of the dielectric constant. From the results obtained, it can be concluded that purified galactomannan has the potential for possible applications in the electronics industry as a green and eco-friendly dielectric material.

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Hydroxyapatite: A Versatile Bioceramic for Tissue Engineering Application

Kumar

Mohanty²

2022

J Inorg Organomet Polym

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Structural, thermal, morphological and dielectric investigations on 45S5 glass and glass-ceramics

Cited by 19 publications

References 31 publications

Extensive Investigation on the Effect of Niobium Insertion on the Physical and Biological Properties of 45S5 Bioactive Glass for Dental Implant

Extensive Investigation on the Effect of Niobium Insertion on the Physical and Biological Properties of 45S5 Bioactive Glass for Dental Implant

Extraction, Purification and Electrical Characterization of Gross Galactomannan and Purified Galactomannan Obtained from Adenanthera pavonina L. Seeds

Hydroxyapatite: A Versatile Bioceramic for Tissue Engineering Application

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