An Insight into Nano Silver Fluoride-Coated Silk Fibroin Bioinspired Membrane Properties for Guided Tissue Regeneration

The current work focuses on the development of a novel electrospun silk fibroin (SF) nonwoven mat as a GTR membrane with antibacterial, biomineralization and biocompatible properties. The γ-poly glutamic acid (γ-PGA)-capped nano silver fluoride (NSF) and silver diamine fluoride (SDF) were first synthesized, which were dip-coated onto electrospun silk fibroin mats (NSF-SF and SDF-SF). UV-Vis spectroscopy and TEM depicted the formation of silver nanoparticles. NSF-SF and SDF-SF demonstrated antibacterial properties (against Porphyromonas gingivalis) with 3.1 and 6.7 folds higher relative to SF, respectively. Post-mineralization in simulated body fluid, the NSF-SF effectively promoted apatite precipitation (Ca/P ~1.67), while the SDF-SF depicted deposition of silver nanoparticles, assessed by SEM-EDS. According to the FTIR-ATR deconvolution analysis, NSF-SF portrayed ~75% estimated hydroxyapatite crystallinity index (CI), whereas pure SF and SDF-SF demonstrated ~60%. The biocompatibility of NSF-SF was ~82% when compared to the control, while SDF-coated samples revealed in vitro cytotoxicity, further needing in vivo studies for a definite conclusion. Furthermore, the NSF-SF revealed the highest tensile strength of 0.32 N/mm and 1.76% elongation at break. Therefore, it is substantiated that the novel bioactive and antibacterial NSF-SF membranes can serve as a potential candidate, shedding light on further in-depth analysis for GTR applications.

Comparative Evaluation of the Efficacy of Silver Diamine Fluoride, Sodium Fluoride and GC Tooth Mousse Plus and Fluoride Varnish as an Antibacterial Agent in Childhood Caries: As a Literature Review

Background: In preventive dentistry, it is important for the need to prevent rather than to treat early childhood caries and to improve the types of fluoride and application to see if the comparative efficacy is sufficient or insufficient because every type can relieve and give comfort to patients. Aims: To compare the effect of Silver Diamine Fluoride (SDF), fluoride varnish, fluoride gel and GC tooth mousse plus on Streptococcus mutants bacterial load. To evaluate the effect on the types of fluoride on caries. To compare the effect of prevention’s of early childhood caries by using different types of fluoride. Searching the databases using the keywords: sodium diamine fluoride; GC tooth mousse; fluoride varnish; fluoride gel; early childhood caries; caries; varnish; prevention. Materials and methods: 2010-December 2018, databases which were searched: MEDLINE via Ovid, Web of science, Embase, Cochrane Library, LILACS, and Dental specialties: pediatrics, oral preventive. Foreigner languages, editorials, letter to the editor, experimental studies with animals and Short communications were excluded from this review. Results: 2 studies assessed un-clear and need further research of SDF. 5 studies assessed that 12% of SDF has no effect but 38% has an effect with dentin and enamel with black staining as a disadvantage. 1 study showed that SDF is safe and effective compared to fluoride varnish, 2 studies showed that tooth mousse is recommended for early child caries without mentioning SDF and 3 studies found that it decreases the growth of mutants and aids in the remineralization of both enamel and dentin structure. Conclusion: To sum up this study silver diamine fluoride is effective and safe to use for preventing childhood caries than silver fluoride, GC tooth mousse and fluoride varnish, which saves time with increase accuracy and patient satisfaction.

Silver Diamine Fluoride – A “Silver-fluoride Bullet” for Dental Caries

Dental caries is one of the most prevalent diseases across the globe, affecting all age groups. Various public health measures like water fluoridation have been started to control the spread of caries, especially among children. But these intervention methods are inaccessible to people in some parts of the world. Thus, a product called Silver Diamine Fluoride was introduced, which can help arrest carious lesions at an early stage. It is a beneficial aid for caries arrest in both primary and permanent teeth. Also, can be used for arresting root caries. Thus, the objective of this review article is to discuss about silver diamine fluoride and its diverse uses from both clinician and public health point of view.

On-surface products from de-fluorination of C60F48 on Ag(111): C60, C60Fx and silver fluoride formation

By employing diverse surface sensitive synchrotron radiation spectroscopies we demonstrate that the fluorine content of initial C60F48 deposited at room temperature on Ag(111) varies with molecular coverage. At the very...

Mechanical energy-induced CO2 conversion using liquid metals

We report a green carbon capture and conversion technology offering scalability and economic viability for mitigating CO2 emissions. The technology uses suspensions of gallium liquid metal to reduce CO2 into carbonaceous solid products and O2 at near room temperature. The nonpolar nature of the liquid gallium interface allows the solid products to instantaneously exfoliate, hence keeping active sites accessible. The solid co-contributor of silver-gallium rods ensures a cyclic sustainable process. The overall process relies on mechanical energy as the input, which drives nano dimensional triboelectrochemical reactions. By altering the secondary solvent and changing the reactor height, the dissolution and conversion efficiency can be tuned. The optimum reactor height is only 27 cm, when gallium/silver fluoride mix at 7:1 mass ratio is employed as the reaction material. At CO2 input of ~8 sccm, 92% efficiency was obtained at the record low input energy of 228.5 kW∙h for the capture and conversion of a tonne of CO2. The potential impact of this green technology is remarkable, likely benefiting a variety of industries and offering an economical solution for CO2 capture and conversion.