PURPOSE The purpose of this study was to evaluate the effects of the surface treatment and shape of the dental alloy on the composition of the prosthetic work and its metallic ion release in a corrosive medium after casting. MATERIALS AND METHODS Orion Argos (Pd-Ag) and Orion Vesta (Pd-Cu) were used to cast two crowns and two disks. One of each was polished while the other was not. Two as-rec...

  Objective: Evidence shows that the powder/liquid mixing ratio recommended by the manufacturers is often not respected when mixing the glass ionomer (GI) powder and liquid, yielding a GI cement with disproportionate powder/liquid ratio. Considering the confirmed effect of powder/liquid ratio on the GI properties, and more importantly, its fluoride release potential, this study aimed to assess ...

Lithium-ion battery cells with high energy density are widely used in today’s electric vehicles. However, thermal runaway (TR) of a cell is still major safety issue the use lithium-ion batteries automotive sector. In particular, variability TR, which not yet fully understood, can lead to significant issues. This paper investigates individual decomposition reactions during TR and their influence...

Photoresponsive ion extraction/release systems (PRIONERS) represent a highly interesting tool for the localized and time-controlled chemical perturbation of biological materials. We report here on our first results on phototriggered calcium and sodium exchanging materials. Such materials exist in two distinct states ("on" and "off"), depending on the wavelength of illumination. We used a combin...

using ion-exchange resins, a multiple-unit type of oral floating dosage system has been prepared to prolong gastric emptying time of dosage form. the system is composed of beads of drug-resin complex, which are loaded with bicarbonate ions and coated with a hydrophobic polymer. the system is so designed that when the beads reach the stomach, chloride ions are exchanged with bicarbonate and drug...

Changes in cytosolic free calcium ([Ca(2+)](i)) often take the form of a sustained response or repetitive oscillations. The frequency and amplitude of [Ca(2+)](i) oscillations are essential for the selective stimulation of gene expression and for enzyme activation. However, the mechanism that determines whether [Ca(2+)](i) oscillates at a particular frequency or becomes a sustained response is ...

Hydrotalcite-type materials, or layered double hydroxide (LDH), are very promising in applying slow-release drug systems through ion exchange and delamination characteristics at acidic pH. In this paper, Zn/Al LDHs 2:1 3:1 molar ratios intercalated with the ibuprofen (IBU) were added to chitosan/alginate membranes. release tests, an increase solubility of membranes could be observed, percentage...

Incubation of human neutrophils with the chemotactic peptide F-met-Ieu-phe induced uptake of extracellular oxygen and production of both superoxide anion (02) and chemiluminescence in a concentrationdependent fashion. F-met-met-met also stimulated these cell functions, but it was less potent than F-met-leu-phe. whereas the nonformylated met-met-met had little effect. Pretreatment of neutrophils...

The aim of this study was to test the null hypothesis that there is no difference in fluoride release between resin-modified glass ionomer cements (RMGICs) and composites in the long term. The materials were divided into 5 groups: a nonfluoride-releasing composite - Group TXT (Transbond XT), a fluoride-releasing composite - Group QC (Quick-Cure), and three RMGICs - Groups FOLC, FOB and MC (Fuji...

Metallic biomaterials are commonly used for fixation or replacement of damaged bones in the human body due to their good combination of mechanical properties. The disadvantage of metals as implant materials is their susceptibility to corrosion and metal ion release, which can cause serious health problems. In certain concentrations metals and metal ions are toxic and their presence can cause di...