Papers by Keyword: NaF

Abstract: TiSiN thin films were deposited on NiCr dental alloy in order to enhance the corrosion resistance in artificial saliva with and without fluoride content. The TiSiN films were prepared using reactive cathodic arc method at two different substrate bias voltages (-50 V and-200 V). For the corrosion evaluation, artificial saliva with pH=5.2 was chosen, because this is a critical value for mineral dissolution of dental tissue which can affect the dental alloys. A content of 0.1 % NaF was added to the artificial saliva to simulate the effect of fluoride based hygiene products. The TiSiN coated NiCr alloys exhibited a higher corrosion resistance than the NiCr substrate, irrespective of the testing environment. The best corrosion resistance was found for the TiSiN deposited at-200 V.

Abstract: With the expansion of the scale of the communication network, the constant introduction of new business as well as the use of mobile network equipment from different hardware manufacturers, networks become larger and more complex, the device shows diversification, which makes the network management of the entire mobile communication network extremely complex. A complete set of advanced communications network management system to effectively manage a variety of physical devices and logical resources is particularly important. Based on TMN basic theory analysis of the network management function model, the intermediary function in the system model, unified network management system and the corresponding communication network equipment interoperable access interface, so that the whole network management system functional hierarchy is more clear, easy implementation of network management business module; the system based on the framework enables unified NMS network element management, network management can be independent of the specific equipment to avoid the R & D work duplication of each managed device interface and improve the development efficiency as well as the maintainability and scalability of the system, which laid the foundation for the provision of integrated access and reference for the design and development of next-generation telecommunications network management.

Abstract: The g factors for the cubic Fe⁺ centers in LiF and NaF are theoretically investigated from the perturbation formula of the g factor for an octahedral 3d⁷ cluster including the contributions from the ligand orbital and spin-orbit coupling interactions. The increasing order of the g factor (i.e., LiF < NaF) can be ascribed to the decrease in covalency and the strength of cubic crystal-field of the systems. The validity of the results is discussed.

Abstract: Using industrial material and synthetic test instrument for the physical characteristics of slag, the effects of NaF on melting temperature, viscosity, fluidity, surface tension and Al2O3 inclusion adsorption of mould flux for thin slab continuous casting were studied. The results showed that with the increase of NaF content, melting temperature, viscosity and surface tension decreased obviously, and fluidity and Al2O3 inclusion adsorption increased. The effects of basicity on properties should be taken into account. NaF could play effective role when its content was less than 9%. The results would play a guiding role in designing of mould flux for thin slab continuous casting.

Abstract: Vanadium doped zircon pigments were prepared by ceramic method from mixture of monoclinic zirconia and silica and sodium fluoride as mineralizer on the colour properties of the pigments was also investigated. The colour of synthesized pigments observed in the absence and the presence of the NaF was green and blue, respectively. They were characterized by X-ray diffraction and UV-Vis spectroscopy.

Abstract: A previous study reported that many supplements have been added to NaF mouthrinses to improve the remineralization potential. Nano-hydroxyapatite (nano-HA) might also be suitable to this purpose because these nano-size particles can penetrate the enamel pores. Moreover, hydroxyapatite is similar to the inorganic component of teeth and is both bioactive and biocompatible. The aim of this study was to evaluate the combined effects of a nano-HA and fluoride mouthrinse on an early caries lesion in human enamel using an in vitro cycle remineralization and treatment model. Forty-eight human enamel specimens, which had a Vickers Hardness Number (VHN) of 25~45 were artificially demineralized for 48h. There were 8 treatment groups (0%, 1%, 5%, 10% nano-HA in distilled water and the same concentrations of nano-HA in a 0.05% NaF solution). The specimens were incubated in an in vitro remineralization model. After immersing the specimens into the treatment and remineralization solution for 12 hours each, the VHN of each specimen was evaluated for total 24 hours. This step was repeated once again for total 48 hours. The enamel surfaces of all specimens were examined by Confocal Laser Scanning Microscopy (CLSM) and SEM. The statistical significance of the data was identified by one-way ANOVA followed by a Duncan’s studentized range test. A p value < 0.05 was considered significant. The results showed that the degree of remineralization, as revealed by the VHN values, was higher in the NaF groups than in the distilled water groups. The VHNs of the remineralized enamel specimens for 48 hours were higher than after the 24 hours treatment. In addition, the level of remineralization increased with increasing concentration of nano-HA and was more pronounced in the NaF groups than the distilled water groups (p<0.05). The CLSM and SEM images nano-sized particles attached to the enamel in the nano-HA treated groups. Nano-HA might play a synergistic role in remineralization with a fluoride mouthrinse. However, more study will be needed to determine the optimal condition of nano-HA and NaF mouthrinse for human use. In conclusion, nano-HA in a 0.05% NaF mouthrinse can help remineralize an early caries lesion.