The results of this study suggest that MRI is not a completely safe technique in patients with amalgam restorations. It was shown that the main effect of fields led to the appearance of thermoelectromagnetic convection, which is responsible for the enhancement of the diffusion process, grain boundary migration and vacancy formation resulting in microleakage.

©Operative Dentistry, 2010, 35-6, 682-688 F Shafiei • M Motamedi AA Alavi • B Namvar Clinical RelevanceThe effect of oxalate desensitizer application after acid etching on the dentinal marginal sealing ability of resin composite restorations may be adhesive-specific. SUMMARYThis in vitro study evaluated the effect of an oxalate desensitizer (OX) on the marginal microleakage of resin composite restorations bonded by two three-step and two two-step etch and rinse adhesives. Class V cavities were prepared on the buccal surfaces of 126 extracted premolars at the cementoenamel junction and randomly divided into nine groups of 14 each. In the control groups (1-4), four adhesives were applied, respectively, including Adper Scotchbond Multi-Purpose (SBMP), Optibond FL (OBFL), One-Step Plus (OS) and Excite (EX). In the experimental groups (5-8), the same adhesives, in combination with OX (BisBlock), were applied. And, in one group, OX was applied without any adhesive, as the negative control group (9). All the groups were restored with a resin composite.After 24 hours of storage in distilled water and thermocycling, the samples were placed in 1% methylene blue dye solution. The dye penetration was evaluated using a stereomicroscope. The data were analyzed using non-parametric

The number of publications and the scientific interest in lung transplantation has increased rapidly in recent years. Citations of articles published in the field of lung transplantation are increasing and the numbers of uncited articles are fewer compared to the average citations of articles and uncited articles in the field of medicine.

(2015) A new X-ray contrast agent based on highly stable gum arabic-gold nanoparticles synthesised in deep eutectic solvent, Journal of Experimental Nanoscience, 10:12, 911-924, DOI: 10.1080/17458080.2014 To link to this article: https://doi.org/10.1080/17458080.2014.933493 This paper reports a novel method of fabricating gum arabic coated gold nanoparticles (GA-GNPs) synthesised in a deep eutectic solvent (DES) for use as a new X-ray contrast agent. GA-GNPs were prepared simply by mixing a solution of 0.01% DES, GA and tetra chloroauric (III) acid at room temperature. DES was prepared using choline chloride (ChCl), gallic acid and glycerol as the precursors. A complete characterisation study of GA-GNPs was undertaken using transmission electron microscopy, dynamic light scattering, X-ray diffraction analysis. In vitro study of the as-prepared GA-GNPs revealed the high potential of these nanoparticles as X-ray contrast agents. Compared with the common clinically available CT contrast agent, Visipaque, the synthesised GA-GNPs showed more than three fold X-ray attenuation coefficient. GA-GNPs were found to be remarkably stable in biological media. The development of such nontoxic, biocompatible nanostructures could be an advancement in diagnostic nanomedicine.

Objectives: The aim of this study was to compare the cytotoxic effect of a methacrylate-based and a silorane-based composite on the human dental pulp stem cells (DPSCs) versus human dental pulp fibroblasts (DPFs). Study Design: Samples of the Filtek Z250 and P90 were polymerized and immersed in the culture medium to obtain extracts after incubation for one, seven and 14 days. Magnetic cell sorting based on the CD146 expression was performed to purify DPSCs and DPFs. After incubation of both cells with the extracts, cytotoxicity was determined using the MTT test. Results: For the extracts of first and seventh day, both composites showed significantly lower cytotoxicity on DPSCs than DPFs (p=0.003). In addition, there was a significant difference in the time-group interaction of both materials indicating different cytotoxic behaviours (p=0.014). In contrast to Z250, exposure to the 14th day extract of P90 resulted in higher cell viability compared to that of day seven. Conclusions: DPSCs are less susceptible to the cytotoxic effect of the composites than DPFs. Compared to Z250, the cytotoxic effect of silorane-based composite decreases as the time passes on. This difference should be considered, particularly in deep cavities, in order to preserve the regenerative capacity of the pulp. Key words:Composite resins, Dental pulp, Mesenchymal Stromal Cells, Silorane, Toxicology.