scholarly journals Silver Nanoparticles in Dental Biomaterials

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Juliana Mattos Corrêa ◽  
Matsuyoshi Mori ◽  
Heloísa Lajas Sanches ◽  
Adriana Dibo da Cruz ◽  
Edgard Poiate ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Biofilm Formation ◽  
Dental Materials ◽  
Antimicrobial Properties ◽  
Antimicrobial Effect ◽  
Filler Level ◽  
Over Time

Silver has been used in medicine for centuries because of its antimicrobial properties. More recently, silver nanoparticles have been synthesized and incorporated into several biomaterials, since their small size provides great antimicrobial effect, at low filler level. Hence, these nanoparticles have been applied in dentistry, in order to prevent or reduce biofilm formation over dental materials surfaces. This review aims to discuss the current progress in this field, highlighting aspects regarding silver nanoparticles incorporation, such as antimicrobial potential, mechanical properties, cytotoxicity, and long-term effectiveness. We also emphasize the need for more studies to determine the optimal concentration of silver nanoparticle and its release over time.

scholarly journals MODIFICATION OF URINARY CATHETERS USING ANTIMICROBIALS FROM STREPTOMYCES SP. ABK 07 FOR URINARY TRACT INFECTION RESISTANCE

2018 ◽  
Vol 11 (7) ◽  
pp. 158
Author(s):  
Angima Bichanga Kingsley, ◽  
Usha R
Keyword(s):  
Mechanical Properties ◽  
Spectral Analysis ◽  
Biofilm Formation ◽  
Urinary Catheter ◽  
Antimicrobial Properties ◽  
Antimicrobial Compound ◽  
Urinary Catheters ◽  
Streptomyces Sp ◽  
Infection Resistance

Objective: The main aim of this study is to prevent biofilm formation by impregnating an antimicrobial on urinary catheter.Methods: Catheter segments were immersed in the antimicrobial compound for impregnation. After 2 h, the segments were removed, sterilized and dried after which mechanical and antimicrobial properties of the catheter segments were determined. The shelf life of the impregnated segments was also ascertained as well as anti-biofilm assay. Spectral analysis (UV & FTIR) was also performed.Results: Impregnation was achieved by immersing catheter segments in antimicrobial compound ensuring it does not affect the catheter texture. The impregnated antimicrobial catheters were able to prevent colonization by common uropathogens Escherichia coli, Proteus, Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella, and Candida albicans for up to 12 weeks. Antibiotic impregnation of the catheters did not affect the mechanical properties and did not render it as unfit for insertion. The antimicrobial-impregnated catheter offers a means of reducing biofilm formation and subsequently reducing the infection in long-term urinary catheter users. Spectral analysis was done by UV-Vis and FTIR.Conclusion: Antibiotic impregnation of the catheters did not affect the mechanical properties and did not render it as unfit for insertion. The antimicrobial impregnated catheter offers a means of reducing biofilm formation and subsequently reducing the infection in long-term urinary catheter users.

scholarly journals Effect of Photoinitiator on Precursory Stability and Curing Depth of Thiol-Ene Clickable Gelatin

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1877
Author(s):  
Kai-Hung Yang ◽  
Gabriella Lindberg ◽  
Bram Soliman ◽  
Khoon Lim ◽  
Tim Woodfield ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Visible Light ◽  
Rheological Properties ◽  
Swelling Ratio ◽  
Sodium Persulfate ◽  
Photo Polymerization ◽  
Gelation Kinetics ◽  
The Stability ◽  
Over Time

Recent advances highlight the potential of photopolymerizable allylated gelatin (GelAGE) as a versatile hydrogel with highly tailorable properties. It is, however, unknown how different photoinitiating system affects the stability, gelation kinetics and curing depth of GelAGE. In this study, sol fraction, mass swelling ratio, mechanical properties, rheological properties, and curing depth were evaluated as a function of time with three photo-initiating systems: Irgacure 2959 (Ig2959; 320–500 nm), lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP; 320–500 nm), and ruthenium/sodium persulfate (Ru/SPS; 400–500 nm). Results demonstrated that GelAGE precursory solutions mixed with either Ig2959 or LAP remained stable over time while the Ru/SPS system enabled the onset of controllable redox polymerization without irradiation during pre-incubation. Photo-polymerization using the Ru/SPS system was significantly faster (<5 s) compared to both Ig2959 (70 s) and LAP (50 s). Plus, The Ru/SPS system was capable of polymerizing a thick construct (8.88 ± 0.94 mm), while Ig2959 (1.62 ± 0.49 mm) initiated hydrogels displayed poor penetration depth with LAP (7.38 ± 2.13 mm) in between. These results thus support the use of the visible light based Ru/SPS photo-initiator for constructs requiring rapid gelation and a good curing depth while Ig2959 or LAP can be applied for photo-polymerization of GelAGE materials requiring long-term incubation prior to application if UV is not a concern.

scholarly journals Facile Route of Fabricating Long-Term Microbicidal Silver Nanoparticle Clusters against Shiga Toxin-Producing Escherichia coli O157:H7 and Candida auris

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 28
Author(s):  
Sheeana Gangadoo ◽  
Aaron Elbourne ◽  
Alexander E. Medvedev ◽  
Daniel Cozzolino ◽  
Yen B. Truong ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Silver Nanoparticle ◽  
Antimicrobial Properties ◽  
Reduction Reaction ◽  
Fungal Species ◽  
Escherichia Coli O157 ◽  
Candida Auris ◽  
Surface Design ◽  
Marine Applications

Microbial contamination remains a significant issue for many industrial, commercial, and medical applications. For instance, microbial surface contamination is detrimental to numerous aspects of food production, infection transfer, and even marine applications. As such, intense scientific interest has focused on improving the antimicrobial properties of surface coatings via both chemical and physical routes. However, there is a lack of synthetic coatings that possess long-term microbiocidal performance. In this study, silver nanoparticle cluster coatings were developed on copper surfaces via an ion-exchange and reduction reaction, followed by a silanization step. The durability of the microbiocidal activity for these develped surfaces was tested against pathogenic bacterial and fungal species, specifically Escherichia coli O157:H7 and Candida auris, over periods of 1- and 7-days. It was observed that more than 90% of E. coli and C. auris were found to be non-viable following the extended exposure times. This facile material fabrication presents as a new surface design for the production of durable microbicidal coatings which can be applied to numerous applications.

Core–Shell Silver Nanoparticles in Endodontic Disinfection Solutions Enable Long-Term Antimicrobial Effect on Oral Biofilms

2017 ◽  
Vol 9 (40) ◽  
pp. 34762-34772 ◽  
Author(s):  
Elif Ertem ◽  
Beatrice Gutt ◽  
Flavia Zuber ◽  
Sergio Allegri ◽  
Benjamin Le Ouay ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Effect ◽  
Core Shell ◽  
Oral Biofilms

Long-Term Antimicrobial Effect of Silicon Nanowires Decorated with Silver Nanoparticles

2010 ◽  
Vol 22 (48) ◽  
pp. 5463-5467 ◽  
Author(s):  
Min Lv ◽  
Shao Su ◽  
Yao He ◽  
Qing Huang ◽  
Wenbing Hu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silicon Nanowires ◽  
Antimicrobial Effect

Preparation of poly(vinylidene fluoride)-silver nanoparticle composite using dimethylformide as both a solvent and a reductant

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Yingbo Chen ◽  
Lina Liu ◽  
Yufeng Zhang
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Vinylidene Fluoride ◽  
Silver Salt ◽  
Α Phase ◽  
Phase Crystal ◽  
Poly Vinylidene Fluoride ◽  
Pure Pvdf

AbstractPoly(vinylidene fluoride)-silver nanoparticle (PVDF-Ag) composites were synthesized by in situ reduction of silver salt using dimethylformide (DMF) as both a solvent and a reductant. The crystalline properties (e.g., crystallinity and the types of crystals) of the composites were characterized. It was shown that PVDF in the composites had a higher melting temperature than pure PVDF, and the α phase crystal in the composites became more stable with an increase in the amount of silver nanoparticles. The mechanical properties and morphologies of the composites were also investigated. It was noted that the PVDF-Ag composites have better mechanical properties when silver nanoparticles were added. The increase in toughness could be attributed to the formation of continuous structure between PVDF and silver particles.

scholarly journals Thermoplastic Polymers with Nanosilver Addition—Microstructural, Surface and Mechanical Evaluation during a 36-Month Deionized Water Incubation Period

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 361
Author(s):  
Magdalena Ziąbka ◽  
Michał Dziadek
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Silver Nanoparticles ◽  
Incubation Period ◽  
Water Environment ◽  
Mechanical Tests ◽  
Deionized Water ◽  
Thermoplastic Polymers

Three types of thermoplastic polymers, acrylonitrile butadiene styrene (ABS), polymethyl methacrylate acrylic (PMMA) and high-density polyethylene (HDPE), were enriched with silver nanoparticles (AgNPs) of 0.5 wt.% and 1.0 wt.%, respectively. The polymers and the composites were manufactured via injection molding. Regarding the potential of these polymers as matrices for long-term use as biomaterials, the aim of this study was to examine their stability in the in vitro conditions during a three-year incubation period in deionized water. In this work, microstructural observations were performed, and mechanical properties were assessed. Surface parameters, such as roughness and contact angle, were comprehensively investigated. The microstructural evaluation showed that the silver additive was homogeneously dispersed in all the examined matrices. The 36-month immersion period indicated no microstructural changes and proved the composites’ stability. The mechanical tests confirmed that the composites retained comparable mechanical properties after the silver incorporation. The Young’s modulus and tensile strength increased during long-term incubation. The addition of silver nanoparticles did not alter the composites’ roughness. The contact angle increased with the rising AgNP content. It was also shown that the materials’ roughness increased with the incubation time, especially for the ABS- and HDPE-based materials. The water environment conditions improved the wettability of the tested materials. However, the silver nanoparticles’ content resulted in the contact angle decreasing during incubation. The conducted studies confirmed that the mechanical properties of all the polymers and composites did not deteriorate; thus, the materials may be considered stable and applicable for long-term working periods in aqueous environments.

scholarly journals Antimicrobial Activity of Calcium Silicate-Based Dental Materials: A Literature Review

Antibiotics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 865
Author(s):  
Ana Cristina Padilha Janini ◽  
Gabriela Fernanda Bombarda ◽  
Lauter Eston Pelepenko ◽  
Marina Angélica Marcano
Keyword(s):  
Antimicrobial Activity ◽  
Calcium Silicate ◽  
Dental Treatment ◽  
Dental Materials ◽  
Antimicrobial Properties ◽  
Antimicrobial Effect ◽  
Biological Tissues ◽  
Biological Properties ◽  
Treatment Techniques ◽  
Main Challenge

Endodontic biomaterials have significantly improved dental treatment techniques in several aspects now that they can be used for vital pulp treatments, as temporary intracanal medication, in definitive fillings, in apical surgeries, and for regenerative procedures. Calcium silicate-based cement is a class of dental material that is used in endodontics in direct contact with the dental structures, connective tissue, and bone. Because the material interacts with biological tissues and stimulates biomineralization processes, its properties are of major importance. The main challenge in endodontic treatments is the elimination of biofilms that are present in the root canal system anatomical complexities, as it remains even after chemical-mechanical preparation and disinfection procedures. Thus, an additional challenge for these biomaterials is to exert antimicrobial activity while maintaining their biological properties in parallel. This article reviews the literature for studies considering the antimicrobial properties of calcium silicate-based dental biomaterials used in endodontic practice. Considering the reviewed studies, it can be affirmed that the reduced antimicrobial effect exhibited by calcium silicate-based endodontic materials clearly emphasizes that all clinical procedures prior to their use must be carefully performed. Future studies for the evaluation of these materials, and especially newly proposed materials, under poly-microbial biofilms associated with endodontic diseases will be necessary.

scholarly journals Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Extract and Evaluation of Their Antibacterial Activity

2020 ◽  
Vol 71 (2) ◽  
pp. 273-279
Author(s):  
Daniela Gitea ◽  
Andrei Teodorescu ◽  
Carmen Pantis ◽  
Delia Mirela Tit ◽  
Alexa Florina Bungau ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Antimicrobial Properties ◽  
Silver Ions ◽  
Antimicrobial Effect ◽  
Colloidal Dispersion ◽  
Colloidal Dispersions ◽  
Application Potential ◽  
Hypericum Perforatum L ◽  
Pathogenic Agents

Silver nanoparticles (AgNPs) ranging in size from 1-100 nm show good application potential in many medical fields (therapies, medical devices, molecular diagnostics) due to their antimicrobial properties. The purpose of this study is to characterize from physicochemical perspective the colloidal dispersion obtained through phyto-synthesis. The existence of colloidal silver particles was visually highlighted through Thyndall effect. The bio-reduction of silver ions was analyzed through modern techniques, UV-VIS spectrophotometry and Hyperspectral Microscopy. After getting the colloidal dispersion, its antibacterial activity was proved by sowing on different plates the following types of pathogenic agents: Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa. The UV-VIS spectrum for the methanolic extract with 10% H. perforatum L. and for the silver colloidal dispersions was achieved, observing a max at 455 nm. The hyperspectral images were achieved observing the shape, conformation, and the size of the obtained particles. During the antibacterial efficacy testing on those three strains of pathological agents, in all situations, the colloidal dispersion had a promising antimicrobial effect.

scholarly journals Antimicrobial Effect of Electrospun Nanofibers Loaded with Silver Nanoparticles: Influence of Ag Incorporation Method

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Luis Jesús Villarreal-Gómez ◽  
Graciela Lizeth Pérez-González ◽  
Nina Bogdanchikova ◽  
Alexey Pestryakov ◽  
Vadim Nimaev ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Electrospun Nanofibers ◽  
Silver Ions ◽  
Antimicrobial Effect ◽  
The Other ◽  
High Antimicrobial Activity ◽  
Biomedical Industry ◽  
Incorporation Method

The antimicrobial bioactivity of silver nanoparticles is well known, and they can be used widely in many applications, becoming especially important in the biomedical industry. On the other hand, the electrospun nanofibers possess properties that can enhance silver nanoparticle applicability. However, silver nanoparticle bioactivity differs depending on the loading of silver ions into electrospun nanofibers. This review is aimed at comparing different silver incorporation methods into electrospun nanofibers and their antimicrobial activity, discussing each procedure’s limitations, and presenting the most promising one. This review showed that the preferred techniques for incorporating silver nanoparticles were direct blending and ultraviolet irradiation methods due to their simplicity and efficient results. Besides, polyacrylonitrile nanofibers (PAN) have been the most reported system loaded with silver nanoparticles. Finally, independently of the technique used, silver nanoparticle-loaded nanofibers show high antimicrobial activity in all cases.

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