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1.
Sci Rep ; 14(1): 15837, 2024 Jul 09.
Article de Anglais | MEDLINE | ID: mdl-38982204

RÉSUMÉ

45S5 Bioglass (BG) is composed of a glass network with silicate based on the component and can be doped with various therapeutic ions for the enhancement of hard tissue therapy. Nanoceria (CeO2) has been shown to indicate redox reaction and enhance the biological response. However, few studies focus on the proportion of CeO2-doped and its effect on the cellular bioactivity of CeO2-doped BG (CBG). In this study, we synthesized the CBG series with increasing amounts of doping CeO2 ranging (1 to 12) wt.%. The synthesized CBG series examined the characterization, mineralization capacity, and cellular activity against BG. Our results showed that the CBG series exhibited a glass structure and indicated the redox states between Ce3+ and Ce4+, thus they showed the antioxidant activity by characterization of Ce. The CBG series had a stable glass network structure similar to BG, which showed the preservation of bioactivity by exhibiting mineralization on the surface. In terms of biological response, although the CBG series showed the proliferative activity of pre-osteoblastic cells similar to BG, the CBG series augmented not only the alkaline phosphatase activity but also the osteogenic marker in the mRNA level. As stimulated the osteogenic activity, the CBG series improved the biomineralization. In conclusion, the CBG series might have a potential application for hard tissue therapeutic purposes.


Sujet(s)
Céramiques , Cérium , Verre , Oxydoréduction , Cérium/composition chimique , Cérium/pharmacologie , Oxydoréduction/effets des médicaments et des substances chimiques , Verre/composition chimique , Souris , Céramiques/composition chimique , Céramiques/pharmacologie , Animaux , Ostéoblastes/effets des médicaments et des substances chimiques , Ostéoblastes/métabolisme , Prolifération cellulaire/effets des médicaments et des substances chimiques , Ostéogenèse/effets des médicaments et des substances chimiques , Lignée cellulaire , Matériaux biocompatibles/composition chimique , Matériaux biocompatibles/pharmacologie , Phosphatase alcaline/métabolisme
2.
ACS Appl Bio Mater ; 7(7): 4642-4653, 2024 Jul 15.
Article de Anglais | MEDLINE | ID: mdl-38967050

RÉSUMÉ

Titanium-based implants have long been studied and used for applications in bone tissue engineering, thanks to their outstanding mechanical properties and appropriate biocompatibility. However, many implants struggle with osseointegration and attachment and can be vulnerable to the development of infections. In this work, we have developed a composite coating via electrophoretic deposition, which is both bioactive and antibacterial. Mesoporous bioactive glass particles with gentamicin were electrophoretically deposited onto a titanium substrate. In order to validate the hypothesis that the quantity of particles in the coatings is sufficiently high and uniform in each deposition process, an easy-to-use image processing algorithm was designed to minimize human dependence and ensure reproducible results. The addition of loaded mesoporous particles did not affect the good adhesion of the coating to the substrate although roughness was clearly enhanced. After 7 days of immersion, the composite coatings were almost dissolved and released, but phosphate-related compounds started to nucleate at the surface. With a simple and low-cost technique like electrophoretic deposition, and optimized stir and suspension times, we were able to synthesize a hemocompatible coating that significantly improves the antibacterial activity when compared to the bare substrate for both Gram-positive and Gram-negative bacteria.


Sujet(s)
Antibactériens , Chitosane , Électrophorèse , Gentamicine , Verre , Test de matériaux , Nanoparticules , Taille de particule , Propriétés de surface , Titane , Gentamicine/pharmacologie , Gentamicine/composition chimique , Titane/composition chimique , Titane/pharmacologie , Antibactériens/pharmacologie , Antibactériens/composition chimique , Verre/composition chimique , Nanoparticules/composition chimique , Chitosane/composition chimique , Chitosane/pharmacologie , Porosité , Tests de sensibilité microbienne , Humains , Matériaux revêtus, biocompatibles/composition chimique , Matériaux revêtus, biocompatibles/pharmacologie , Prothèses et implants , Matériaux biocompatibles/composition chimique , Matériaux biocompatibles/pharmacologie
3.
Luminescence ; 39(7): e4822, 2024 Jul.
Article de Anglais | MEDLINE | ID: mdl-39019842

RÉSUMÉ

Holmium (Ho3+)-doped boro-bismuth-germanate glasses having the chemical composition (30-x)B2O3 + 20GeO2 + 20Bi2O3 + 20Na2O + 10Y2O3 + xHo2O3, where x = 0.1, 0.5, 1.0, and 2.0 mol% were prepared by melt-quenching technique. The prepared glasses were examined for thermal, optical, vibrational, and photoluminescent properties. The prepared glasses were found to be thermally very stable. The optical bandgap and Urbach energies of 0.1 mol% Ho2O3-doped boro-bismuth-germanate glass were calculated to be 3.3 eV and 377 MeV, respectively, using the absorption spectrum. The Judd-Ofelt analysis was performed on the 0.1 mol% Ho2O3-doped glass and compared the obtained parameters with literature. The branching ratio (ß) and emission cross-section (σem) of the green band were determined to be 0.7 and 0.24 × 10-20 cm2, respectively. Under 450 nm excitation, a strong green emission around 550 nm was observed and assigned to the (5S2 + 5F4) → 5I8 (Ho3+) transition. Upon an increase of Ho2O3 content from 0.1 to 2.0 mol%, the intensities of all observed emission bands as well as decay time of the (5S2 + 5F4) → 5I8 transition have been decreased gradually. The reasons behind the decrease in emission intensity and decay time were discussed. The strong green emission suggests that these glasses may be a better option for display devices and green emission applications.


Sujet(s)
Bismuth , Germanium , Verre , Holmium , Luminescence , Holmium/composition chimique , Verre/composition chimique , Germanium/composition chimique , Bismuth/composition chimique , Vibration , Mesures de luminescence , Phénomènes optiques
4.
J Mater Sci Mater Med ; 35(1): 38, 2024 Jul 03.
Article de Anglais | MEDLINE | ID: mdl-38958834

RÉSUMÉ

Fabrication of porous tissue-engineering scaffolds from bioactive glasses (BAG) is complicated by the tendency of BAG compositions to crystallize in thermal treatments during scaffold manufacture. Here, experimental biocompatible glass S59 (SiO2 59.7 wt%, Na2O 25.5 wt%, CaO 11.0 wt%, P2O5 2.5 wt%, B2O3 1.3 wt%), known to be resistant to crystallization, was used in sintering of glass granules (300-500 µm) into porous scaffolds. The dissolution behavior of the scaffolds was then studied in vivo in rabbit femurs and under continuous flow conditions in vitro (14 days in vitro/56 days in vivo). The scaffolds were osteoconductive in vivo, as bone could grow into the scaffold structure. Still, the scaffolds could not induce sufficiently rapid bone ingrowth to replace the strength lost due to dissolution. The scaffolds lost their structure and strength as the scaffold necks dissolved. In vitro, S59 dissolved congruently throughout the 14-day experiments, resulting in only a slight reaction layer formation. Manufacturing BAG scaffolds from S59 that retain their amorphous structure was thus possible. The relatively rapid and stable dissolution of the scaffold implies that the glass S59 may have the potential to be used in composite implants providing initial strength and stable, predictable release of ions over longer exposure times.


Sujet(s)
Matériaux biocompatibles , Verre , Test de matériaux , Ingénierie tissulaire , Structures d'échafaudage tissulaires , Animaux , Lapins , Structures d'échafaudage tissulaires/composition chimique , Verre/composition chimique , Matériaux biocompatibles/composition chimique , Porosité , Ingénierie tissulaire/méthodes , Fémur , Solubilité , Substituts osseux/composition chimique , Régénération osseuse
5.
BMC Oral Health ; 24(1): 775, 2024 Jul 10.
Article de Anglais | MEDLINE | ID: mdl-38987748

RÉSUMÉ

Acrylic resins are widely used as the main components in removable orthodontic appliances. However, poor oral hygiene and maintenance of orthodontic appliances provide a suitable environment for the growth of pathogenic microorganisms. In this study, strontium-modified phosphate-based glass (Sr-PBG) was added to orthodontic acrylic resin at 0% (control), 3.75%, 7.5%, and 15% by weight to evaluate the surface and physicochemical properties of the novel material and its in vitro antifungal effect against Candida albicans (C. albicans). Surface microhardness and contact angle did not vary between the control and 3.75% Sr-PBG groups (p > 0.05), and the flexural strength was lower in the experimental groups than in the control group (p < 0.05), but no difference was found with Sr-PBG content (p > 0.05). All experimental groups showed an antifungal effect at 24 and 48 h compared to that in the control group (p < 0.05). This study demonstrated that 3.75% Sr-PBG exhibits antifungal effects against C. albicans along with suitable physicochemical properties, which may help to minimize the risk of adverse effects associated with harmful microbial living on removable orthodontic appliances and promote the use of various materials.


Sujet(s)
Résines acryliques , Antifongiques , Candida albicans , Verre , Test de matériaux , Phosphates , Strontium , Propriétés de surface , Candida albicans/effets des médicaments et des substances chimiques , Résines acryliques/composition chimique , Strontium/pharmacologie , Strontium/composition chimique , Antifongiques/pharmacologie , Verre/composition chimique , Phosphates/pharmacologie , Polymérisation , Dureté , Résistance à la flexion , Humains , Techniques in vitro
6.
J Environ Manage ; 365: 121685, 2024 Aug.
Article de Anglais | MEDLINE | ID: mdl-38963964

RÉSUMÉ

Ternary alkali-activated binder was prepared by blast furnace slag (GGBS), recycled powder (RP) and waste glass powder (WGP) using simplex centroid design method. By measuring the fluidity, setting time, drying shrinkage and mechanical property of specimen, the complementary effect of GGBS, RP and WGP was discussed. The reaction mechanism and microstructure were explored by X-ray diffraction and scanning electron microscopy. The results reveal that the addition of RP could significantly reduce the fluidity and setting time of paste, while WGP can obviously improve the rheological property and play a retarding role. The workability of paste can be effectively regulated by mixing RP and WGP together. Whether added alone or in combination, RP and WGP can effectively improve the shrinkage performance. In the ternary system, GGBS can be rapidly activated and form a skeleton structure. The fine RP particles can play a good role in filling the structure, and the pozzolanic reaction of WGP gradually occurs, which makes the microstructure more compact. The incorporation of GGBS, RP and WGP can promote the growth of hydration products, improve the density of microstructure, and form a certain complementary effect.


Sujet(s)
Alcalis , Verre , Poudres , Recyclage , Verre/composition chimique , Alcalis/composition chimique , Diffraction des rayons X , Microscopie électronique à balayage
7.
PLoS One ; 19(7): e0305038, 2024.
Article de Anglais | MEDLINE | ID: mdl-38985781

RÉSUMÉ

The meta-learning method proposed in this paper addresses the issue of small-sample regression in the application of engineering data analysis, which is a highly promising direction for research. By integrating traditional regression models with optimization-based data augmentation from meta-learning, the proposed deep neural network demonstrates excellent performance in optimizing glass fiber reinforced plastic (GFRP) for wrapping concrete short columns. When compared with traditional regression models, such as Support Vector Regression (SVR), Gaussian Process Regression (GPR), and Radial Basis Function Neural Networks (RBFNN), the meta-learning method proposed here performs better in modeling small data samples. The success of this approach illustrates the potential of deep learning in dealing with limited amounts of data, offering new opportunities in the field of material data analysis.


Sujet(s)
Matériaux de construction , Apprentissage profond , Verre , , Matières plastiques , Analyse de données
8.
Waste Manag ; 186: 307-317, 2024 Sep 15.
Article de Anglais | MEDLINE | ID: mdl-38954922

RÉSUMÉ

Rapid expansion in urban areas has engendered a superfluity of municipal solid waste (MSW) stemming from contemporary civilization, encompassing commercial sectors and human undertakings. Kerbside waste, a type of MSW, has the potential for recycling and reuse at the end of its first life cycle, but is often limited to a linear cycle. This study aimed to assess the life cycle costs of different separation and recycling methods for handling kerbside waste. A new life cycle cost model, drawing from the circular economy's value retention process (VRP) model, has been created and applied to assess the continuous recycling of kerbside glass. The study investigates two key separation techniques, kerbside recycling mixed bin recycling (KRMB) kerbside glass recycling separate bin (KGRSB) and analyses their impact on the life cycle cost of the recycling process. Additionally, the research explores two approaches of recycling and downcycling: closed-loop recycling, which pertains to the recycling of glass containers, and open-looped recycling, which involves the use of recycled glass in asphalt. The results showed when use annually collected waste as the functional unit, the KRMB model incurred lower costs compared to the KGRSB model due to its lower production output. However, when evaluated over a 1-ton production of glass container and asphalt, the KGRSB method demonstrated superior cost performance with a 40-50% reduction compared to the KRMB method. The open-loop recycling method (asphalt) incurred a higher cost compared to the closed-loop recycling method due to its larger production volume over a 21-year period.


Sujet(s)
Recyclage , Déchets solides , Gestion des déchets , Recyclage/méthodes , Recyclage/économie , Déchets solides/analyse , Gestion des déchets/méthodes , Gestion des déchets/économie , Verre , Élimination des déchets/méthodes , Élimination des déchets/économie , Hydrocarbures
9.
Radiat Prot Dosimetry ; 200(11-12): 1233-1236, 2024 Jul 17.
Article de Anglais | MEDLINE | ID: mdl-39016503

RÉSUMÉ

The shielding of gamma radiation is of the utmost importance in industries, such as nuclear power plants, medical imaging, and space exploration. For the purpose of shielding objects in such an environment, it is essential to design materials with flexibility as well as high shielding capability. In order to enhance the radiation attenuation effectiveness of polymers, such as polyvinyl alcohol (PVA), glass has been blended with varying percentages. The fabricated composite has been subjected to gamma-ray interaction studies. The radiation shielding parameter, such as mass attenuation coefficient (µ/ρ), has been determined for various energies, such as 137Cs (661.6 keV) and 60Co (1173 and 1332 keV). It is observed that the PVA composite with glass exhibits improved gamma radiation shielding properties compared to PVA. Therefore, the present work paves the way for the utility of PVA polymer with glass, offering a cost-effective and sustainable approach to gamma radiation shielding in radiation environments.


Sujet(s)
Rayons gamma , Verre , Poly(alcool vinylique) , Radioprotection , Verre/composition chimique , Radioprotection/instrumentation , Radioprotection/méthodes , Poly(alcool vinylique)/composition chimique , Poly(alcool vinylique)/effets des radiations , Polymères/composition chimique , Radio-isotopes du césium , Radio-isotopes du cobalt , Dose de rayonnement , Test de matériaux
10.
Radiat Prot Dosimetry ; 200(11-12): 1224-1227, 2024 Jul 17.
Article de Anglais | MEDLINE | ID: mdl-39016508

RÉSUMÉ

In the present work, the efficacy of waste glass as fillers in concrete for gamma-ray shielding has been studied. Glass fillers of 0, 15, 30, 45, and 60% concentrations have been incorporated into the concrete mixture. The attenuation measurements were performed using gamma spectrometer with NaI(Tl) detector at 511, 662, 1173, and 1332 keV gamma energies. Gamma-ray shielding parameters, such as the mass attenuation coefficient (µ/ρ), are determined for all filler concentrations. The mass attenuation coefficient of the prepared samples was found to be varied from 0.081 to 0.088, 0.071 to 0.088, 0.05 to 0.058, and 0.05 to 0.055 (cm2 per g) for 511, 662, 1173, and 1332 keV gamma energies, respectively. It was observed that experimentally determined (µ/ρ) values were in very good agreement with theoretical values calculated from EDAX data. Furthermore, it was observed that (µ/ρ) showed an increasing trend with an increase in filler concentration, which is attributed to the increase in the shielding property of the material. Therefore, the glass-concrete composite can be accustomed to reduce the intensity of gamma radiation.


Sujet(s)
Matériaux de construction , Rayons gamma , Verre , Matériaux de construction/analyse , Verre/composition chimique , Radioprotection/méthodes , Spectrométrie gamma , Test de matériaux , Dose de rayonnement
11.
Radiat Prot Dosimetry ; 200(11-12): 1207-1215, 2024 Jul 17.
Article de Anglais | MEDLINE | ID: mdl-39016515

RÉSUMÉ

In the present study, we have prepared six glass samples of bismuth borate using the melt-quenching method with the composition (70-x)B2O3-10CaO-20Na2O-xBi2O3; x = 0, 3, 6, 9, 12 and 15 mol%. The density of the prepared glasses was determined using Archimedes principle. The X-ray diffraction patterns provide confirmation of the amorphous nature of the prepared samples, whereas the Fourier transform infrared measurements pointed to the existence of structural units like BO3, BO4, BiO3 and BiO6 within the glass network. An assessment of the optical absorption spectra unveiled that with the increase in the bismuth oxide content, there was a decrease observed in both the direct and indirect band gap energies. Specifically, they decreased from 3.40 to 2.79 eV and from 3.10 to 2.46 eV, respectively. The properties related to gamma ray attenuation, including the mass attenuation coefficient (µm), effective atomic number (Zeff), half-value layer (HVL) and mean free path (MFP), were examined for all the glass samples. This investigation was carried out using the Phy-X/PSD software, covering the energy range from 0.511 to 1.332 MeV. Out of all the samples, Bi-15, featuring the highest Bi2O3 content, demonstrated the highest µm, Zeff, the smallest HVL and MFP. These results suggest that the glass with 15 mol% of Bi2O3 offers the most effective gamma radiation shielding performance. Moreover, the glasses examined in this study exhibit superior radiation shielding characteristics compared with specific concrete types, namely, ordinary concrete, Hematite serpentine concrete and barite concrete, as well as commercial glasses such as RS-360 and RS-253.


Sujet(s)
Bismuth , Borates , Rayons gamma , Verre , Radioprotection , Bismuth/composition chimique , Verre/composition chimique , Borates/composition chimique , Radioprotection/méthodes , Calcium/composition chimique , Sodium/composition chimique , Diffraction des rayons X , Test de matériaux , Spectroscopie infrarouge à transformée de Fourier
12.
Anal Chem ; 96(28): 11572-11580, 2024 Jul 16.
Article de Anglais | MEDLINE | ID: mdl-38970483

RÉSUMÉ

Lab-on-a-chip systems (LOCs), characterized by their high sensitivity, low sample consumption, and portability, have significantly advanced the field of on-site testing. Despite the evolution of integrated LOCs from qualitative to quantitative analyses, on-chip full integration of sample preparation, purification, and multiplexed detection remains a challenge. Here, we propose a strategy for the heterogeneous integration of a set of complementary metal oxide semiconductor-compatible devices including acoustic resonator, thin-film resistors, and temperature/photosensors as a new type of LOC for nucleic acid testing (NAT). Programmed acoustic streaming-based particles and fluid manipulations largely simplify the nucleic acid extraction process including cell lysis, nucleic acid capture, and elution. The design of the acoustic microextraction module and extraction process was thoroughly studied. Benefitted by the microelectromechanical system approach, the conventional mechanical actions and complex flow control are avoided, which enables a compact hand-held NAT instrument without complicated peripherals. Validation experiments conducted on plasma-harboring mutations in the epidermal growth factor receptor (EGFR) gene confirmed the robustness of the system, achieving an impressive nucleic acid (NA) extraction efficiency of approximately 90% within 5 min and a limit of detection of the target NA in the plasma of 1 copy/µL.


Sujet(s)
Acoustique , Verre , Verre/composition chimique , Humains , Laboratoires sur puces , Récepteurs ErbB/génétique , Acides nucléiques/analyse , Acides nucléiques/isolement et purification , Semiconducteurs , ADN/analyse , ADN/composition chimique
13.
Clin Oral Investig ; 28(8): 430, 2024 Jul 16.
Article de Anglais | MEDLINE | ID: mdl-39012388

RÉSUMÉ

OBJECTIVES: This in vitro study examined the marginal integrity of experimental composite materials doped with bioactive glass (BG). MATERIALS AND METHODS: Class-II MOD cavities were prepared and restored with one of the following composite materials: a commercial composite material as a reference (Filtek Supreme XTE), an experimental composite doped with BG 45S5 (C-20), and an experimental composite doped with a fluoride-containing BG (F-20). Six experimental groups (n = 8) were used, as each of the three composites was applied with (+) or without (-) a universal adhesive (Adper Scotchbond Multipurpose). All specimens were subjected to thermocycling (10,000 x, 5-55 °C) and then additionally stored in artificial saliva for eight weeks. Scanning electron micrographs of the mesial and the distal box were taken at three time points (initial, after thermocycling, and after eight weeks of storage in artificial saliva). The margins were classified as "continuous" and "non-continuous" and the percentage of continuous margins (PCM) was statistically analyzed (α = 0.05). RESULTS: In most experimental groups, thermocycling led to a significant decrease in PCM, while the additional 8-week aging had no significant effect. F-20 + performed significantly better (p = 0.005) after 8 weeks storage in artificial saliva than the reference material with adhesive, while no statistically significant differences were observed at the other two time points. C-20 + exhibited significantly better PCM than the reference material with adhesive after thermocycling (p = 0.026) and after 8 weeks (p = 0.003). CONCLUSIONS: Overall, the experimental composites with BG showed at least as good marginal adaptation as the commercial reference, with an indication of possible re-sealing of marginal gaps. CLINICAL RELEVANCE: Maintaining or improving the marginal integrity of composite restorations is important to prevent microleakage and its likely consequences such as pulp irritation and secondary caries.


Sujet(s)
Résines composites , Adaptation marginale (odontologie) , Restaurations dentaires permanentes , Verre , Test de matériaux , Microscopie électronique à balayage , Salive artificielle , Propriétés de surface , Résines composites/composition chimique , Techniques in vitro , Verre/composition chimique , Restaurations dentaires permanentes/méthodes , Salive artificielle/composition chimique , Humains , Préparation de cavité dentaire , Céramiques/composition chimique , Céments résine/composition chimique , Fluorures/composition chimique
14.
PLoS One ; 19(6): e0303293, 2024.
Article de Anglais | MEDLINE | ID: mdl-38865365

RÉSUMÉ

Silica aerogels or xerogels are renowned dried gels with low density, high surface area, higher porosity, and better thermal stability which makes it suitable for aerospace, light weight structures, thermal insulation, and hydrophobic coatings. But brittle behaviour, low mechanical strength, and high manufacturing cost restrict its usage. Recently, the addition of various fibres like glass or carbon fiber is one of the best reinforcement methods to minimize the brittle behaviour. Supercritical drying technique usually used to develop aerogel that is expensive and difficult to produce in bulk quantities. Higher cost obstacle can be tackled by applying ambient pressure drying technique to develop xerogel. But researcher observed cracks in samples prepared through the ambient pressure drying technique is still a major shortcoming. The aim of this study is to systematically analyze the influence of silica gel fiber reinforcement on silica xerogels, encompassing morphology, mechanics, thermal behaviour, compression test, and thermogravimetric characteristics. The research used a low-cost precursor named Tetraethyl orthosilicate to synthesize low-cost composite Silica xerogel and glass and carbon fiber added to provide strength and flexibility to the overall composite. Silica gel works as binder in strengthening the xerogel network. The investigation employs scanning electron microscopy (SEM) to examine the morphology of the composites, Fourier Transform Infrared (FTIR) analysis to affirm hydrophobic characteristics, compression tests to assess mechanical strength, and thermogravimetric tests to study weight loss under different conditions. SEM results reveals that glass fibers exhibit lower adhesion to the xerogel network compared to carbon fibers. FTIR analysis confirms the hydrophobicity of the composite silica xerogel. Compression tests showed that, under a 48% strain rate, the carbon fiber composite demonstrates superior compressive stress endurance. Thermogravimetric tests revealed a 1% lower weight loss for the carbon fiber composite compared to the glass fiber composite. This work concludes that glass and carbon fiber together with silica gel particles successfully facilitated in developing flexible, less costly, hydrophobic, and crack-free silica xerogel composites by APD. These advancements have the potential to drive innovations in material science and technology across diverse industries.


Sujet(s)
Silice , Silice/composition chimique , Thermogravimétrie , Gels/composition chimique , Gel de silice/composition chimique , Verre/composition chimique , Température , Fibre de carbone/composition chimique , Microscopie électronique à balayage , Porosité , Test de matériaux , Spectroscopie infrarouge à transformée de Fourier
15.
Sci Rep ; 14(1): 13926, 2024 06 17.
Article de Anglais | MEDLINE | ID: mdl-38886498

RÉSUMÉ

This split-mouth blinded randomized controlled study compared the efficacy of a desensitizing agent with oxalate/resin polymer and a universal adhesive containing mesoporous bioactive glass (MBG) for dentin hypersensitivity (DH) relief, using Schiff sensitivity score (SSS) and visual analog scale (VAS). Split quadrants containing teeth with DH were treated with either MS Coat ONE or Hi-Bond Universal with MBG as the functional additive. Assessments at baseline, immediately post-application, and at 1- and 2-week follow-ups used standardized stimulus protocols (air, cold, and acid). The SSS difference was the primary outcome, while the VAS difference was the secondary outcome. A mixed linear effect model performed statistical analysis. Immediate DH reduction occurred in response to air stimuli, with a significant decrease in Group HB than in Group MS (p = 0.0178). Cold stimulus reduction exhibited a gradual cumulative effect, with consistently greater reductions in Group HB than in Group MS (p ≤ 0.0377). Both groups effectively managed acidic stimuli, with no significant differences (p > 0.05). The VAS scores decreased gradually over the follow-up period (p < 0.0001). This study highlights the differential efficacy of treatments for various DH triggers and recommends specific approaches based on different stimulus types. The universal adhesive containing MBG demonstrated DH relief potential, promising efficacy identical to or superior to that of a dedicated desensitizing agent. Further research exploring the long-term efficacy and underlying mechanisms is warranted. The universal adhesive containing MBG can be adopted as an in-office desensitizing agent for DH relief. The desensitizing efficacy of universal adhesive matches or surpasses dedicated agents for air and cold stimuli.


Sujet(s)
Agents désensibilisants dentinaires , Hypersensibilité dentinaire , Humains , Hypersensibilité dentinaire/traitement médicamenteux , Femelle , Mâle , Agents désensibilisants dentinaires/usage thérapeutique , Adulte , Verre/composition chimique , Résultat thérapeutique , Céramiques/composition chimique , Ciments dentaires/composition chimique , Ciments dentaires/usage thérapeutique , Jeune adulte , Adulte d'âge moyen , Porosité
16.
J Med Eng Technol ; 48(1): 12-24, 2024 Jan.
Article de Anglais | MEDLINE | ID: mdl-38857023

RÉSUMÉ

Haemorrhage is the leading cause of battlefield deaths and second most common cause for civilian mortality worldwide. Biomaterials-based haemostatic agents are used to aid in bleeding stoppage; mesoporous bioactive glasses (MBGs) are candidates for haemostasis. Previously made Tantalum-containing MBG (Ta-MBG) powders' compositions were fabricated as electrospun fibres for haemostatic applications in the present study. The fibres were fabricated to address the challenges associated with the powder form: difficult to compress without gauze, getting washed away in profuse bleeding, generating dust in the surgical environment, and forming thick callus-difficult to remove for surgeons and painful for patients. Ta-MBGs were based on (80-x)SiO2-15CaO-5P2O5-xTa2O5 mol% compositions with x = 0 (0Ta), 0.5 (0.5Ta), 1 (1Ta), and 5 (5Ta) mol%. The present study details the fibres' in vitro analyses, elucidating their cytotoxic effects, and haemostatic capabilities and relating these observations to fibre chemistry and previously fabricated powders of the same glasses. As expected, when Ta addition is increased at the expense of silica, a new FTIR peak (non-bridging oxygen-silicon, Si-NBO) develops and Si-O-Si peaks become wider. Compared to 0Ta and 1Ta fibres, 0.5Ta show Si-O peaks with reduced intensity. The fibres had a weaker intensity of Si-NBO peaks and release fewer ions than powders. A reduced ion profile provides fibres with a stable matrix for clot formation. The ion release profile for 1Ta and 5Ta fibres was significantly lower than 0Ta and 0.5Ta fibres. Ta-MBGs were not found to be cytotoxic to primary rat fibroblasts using a methyl thiazolyl tetrazolium (MTT) assay. Furthermore, a modified activated partial thromboplastin time assay analysing the fibrin absorbance showed that the absorption increases from physiological clotting < 0Ta < 0.5Ta < 5Ta < commercial haemostat, Surgical SNoWTM, Ethicon, USA < 1Ta. Higher absorption signifies a stronger clot. It is concluded that Ta-MBG fibres can provide stable matrix for clot formation and 1Ta can potentially enhance clotting best among other Ta-MBGs.


Sujet(s)
Verre , Tantale , Tantale/composition chimique , Verre/composition chimique , Hémostatiques/composition chimique , Hémostatiques/pharmacologie , Hémostase/effets des médicaments et des substances chimiques , Animaux , Porosité , Humains , Rats , Matériaux biocompatibles/composition chimique
18.
Nature ; 630(8016): 368-374, 2024 Jun.
Article de Anglais | MEDLINE | ID: mdl-38867128

RÉSUMÉ

Despite its disordered liquid-like structure, glass exhibits solid-like mechanical properties1. The formation of glassy material occurs by vitrification, preventing crystallization and promoting an amorphous structure2. Glass is fundamental in diverse fields of materials science, owing to its unique optical, chemical and mechanical properties as well as durability, versatility and environmental sustainability3. However, engineering a glassy material without compromising its properties is challenging4-6. Here we report the discovery of a supramolecular amorphous glass formed by the spontaneous self-organization of the short aromatic tripeptide YYY initiated by non-covalent cross-linking with structural water7,8. This system uniquely combines often contradictory sets of properties; it is highly rigid yet can undergo complete self-healing at room temperature. Moreover, the supramolecular glass is an extremely strong adhesive yet it is transparent in a wide spectral range from visible to mid-infrared. This exceptional set of characteristics is observed in a simple bioorganic peptide glass composed of natural amino acids, presenting a multi-functional material that could be highly advantageous for various applications in science and engineering.


Sujet(s)
Adhésifs , Verre , Oligopeptides , Adhésifs/composition chimique , Verre/composition chimique , Température , Vitrification , Eau/composition chimique , Oligopeptides/composition chimique , Tyrosine/composition chimique , Lumière , Rayons infrarouges
19.
ACS Appl Mater Interfaces ; 16(24): 30715-30727, 2024 Jun 19.
Article de Anglais | MEDLINE | ID: mdl-38833722

RÉSUMÉ

Pulp and periapical diseases can lead to the cessation of tooth development, resulting in compromised tooth structure and functions. Despite numerous efforts to induce pulp regeneration, effective strategies are still lacking. Growth factors (GFs) hold considerable promise in pulp regeneration due to their diverse cellular regulatory properties. However, the limited half-lives and susceptibility to degradation of exogenous GFs necessitate the administration of supra-physiological doses, leading to undesirable side effects. In this research, a heparin-functionalized bioactive glass (CaO-P2O5-SiO2-Heparin, abbreviated as PSC-Heparin) with strong bioactivity and a stable neutral pH is developed as a promising candidate to addressing challenges in pulp regeneration. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis reveal the successful synthesis of PSC-Heparin. Scanning electron microscopy and X-ray diffraction show the hydroxyapatite formation can be observed on the surface of PSC-Heparin after soaking in simulated body fluid for 12 h. PSC-Heparin is capable of harvesting various endogenous GFs and sustainably releasing them over an extended duration by the enzyme-linked immunosorbent assay. Cytological experiments show that developed PSC-Heparin can facilitate the adhesion, migration, proliferation, and odontogenic differentiation of stem cells from apical papillae. Notably, the histological analysis of subcutaneous implantation in nude mice demonstrates PSC-Heparin is capable of promoting the odontoblast-like layers and pulp-dentin complex formation without the addition of exogenous GFs, which is vital for clinical applications. This work highlights an effective strategy of harvesting endogenous GFs and avoiding the involvement of exogenous GFs to achieve pulp-dentin complex regeneration, which may open a new horizon for regenerative endodontic therapy.


Sujet(s)
Pulpe dentaire , Héparine , Régénération , Héparine/composition chimique , Héparine/pharmacologie , Pulpe dentaire/effets des médicaments et des substances chimiques , Pulpe dentaire/cytologie , Pulpe dentaire/métabolisme , Animaux , Régénération/effets des médicaments et des substances chimiques , Souris , Verre/composition chimique , Humains , Souris nude , Protéines et peptides de signalisation intercellulaire/pharmacologie , Protéines et peptides de signalisation intercellulaire/composition chimique , Cellules souches/effets des médicaments et des substances chimiques , Cellules souches/cytologie , Cellules souches/métabolisme , Différenciation cellulaire/effets des médicaments et des substances chimiques , Prolifération cellulaire/effets des médicaments et des substances chimiques
20.
ACS Biomater Sci Eng ; 10(7): 4510-4524, 2024 Jul 08.
Article de Anglais | MEDLINE | ID: mdl-38826128

RÉSUMÉ

Eggshell membrane-based biomedical applications have recently received great attention for their wound-healing properties. However, there are limited studies on diabetic wound healing. In this regard, we devised four types of composite eggshell membrane mats with nanoscale coatings of bioactive glass/Zn/Co-doped bioactive glass (ESM + BAG, ESM + ZnBAG, ESM + CoBAG, and ESM + ZnCoBAG) as wound-dressing materials for chronic nonhealing diabetic wounds. A detailed study of the physicochemical properties of the mats was conducted. In vitro studies demonstrated cytocompatibility and viability of human dermal fibroblasts on all four types of mats. The cells also attached finely on the mats with the help of cellular extensions, as evident from scanning electron microscopy (SEM) and rhodamine-phalloidin and Hoechst 33342 staining of cellular components. Endowed with bioactive properties, these mats influenced all aspects of full-thickness skin wound healing in diabetic animal model studies. All of the mats, especially the ESM + ZnCoBAG mat, showed the earliest wound closure, effective renewal, and restructuring of the extracellular matrix in terms of an accurate and timely accumulation of collagen, elastin, and reticulin fibers. Hydroxyproline and sulfated glycosaminoglycans were significantly (p < 0.01, p < 0.05) higher in ESM-ZnCoBAG-treated wounds in comparison to ESM-BAG-treated wounds, which suggests that these newly developed mats have potential as an affordable diabetic wound care solution in biomedical research.


Sujet(s)
Bandages , Cobalt , Diabète expérimental , Coquille de l'oeuf , Verre , Cicatrisation de plaie , Zinc , Animaux , Cicatrisation de plaie/effets des médicaments et des substances chimiques , Zinc/composition chimique , Zinc/pharmacologie , Coquille de l'oeuf/composition chimique , Diabète expérimental/anatomopathologie , Verre/composition chimique , Lapins , Cobalt/composition chimique , Cobalt/pharmacologie , Humains , Peau/anatomopathologie , Peau/effets des médicaments et des substances chimiques , Peau/traumatismes , Fibroblastes/effets des médicaments et des substances chimiques
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