OBJECTIVE To compare the galvanic coupling of conventional and metal injection molded (MIM) brackets with commonly used orthodontic archwires. MATERIALS AND METHODS Six of each type of bracket were suspended in lactic acid along with a sample of orthodontic wire (three nickel-titanium and three copper-nickel-titanium) for 28 days at 37 degrees C. The potential differences between the wires an...

The intergranular corrosion susceptibility of ferritic stainless-steel weldments is strongly dependent on chromium carbide precipitation phenomena. Hence, stabilization widely used to mitigate the aforementioned precipitation. In contrast, has proved ineffective fully prevent due segregation unreacted during solid-state heat-treatments. To analyze behavior 17 wt.-% stainless steels laser weldin...

OBJECTIVE Physical UV absorbers such as titanium dioxide or zinc oxide have been found to be highly protective against ultraviolet radiation. Sun protection factor depends on the accumulation of the minerals on the skin. UV-absorbing agents must accumulate within the upper skin layers in order to provide a dense light-absorbing layer and guarantee water resistance. The aim of this work was to i...

This paper presents the results of research on development a technology intended to process electric smelting dusts ilmenite concentrate with extraction silicon and titanium production products in form their dioxides. Dusts were processed for separation using ammonium fluoride method. The optimum conditions fluorination sublimation compounds from dust determined: temperature 260 °С, 6 h duratio...

INTRODUCTION The purpose of this study was to investigate the effect of 6W power Carbon Dioxide Laser (CO2) on the biologic compatibility of the Sandblasting with large grit and acid etching (SLA) titanium discs through studying of the Sarcoma Osteogenic (SaOS-2) human osteoblast-like cells viability. METHODS Sterilized titanium discs were used together with SaOS-2 human osteoblast-like cells...

Titanium undergoes time-dependent degradation in biological capability, or "biological aging". It is unknown whether the biological aging of titanium occurs beyond four weeks and whether age-related changes are definitely associated with surface hydrophilicity. We therefore measured multiple biological parameters of bone marrow-derived osteoblasts cultured on newly prepared, one-month-old, thre...

This study describes the fabrication of two types of multilayered films onto titanium by layer-by-layer (LBL) self-assembly, using poly-L-lysine (PLL) as the cationic polyelectrolyte and deoxyribonucleic acid (DNA) as the anionic polyelectrolyte. The assembling process of each component was studied using atomic force microscopy (AFM) and quartz crystal balance (QCM). Zeta potential of the LBL-c...

Background: This study investigated the prevention of stack corrosion under wet flue gas desulfurization conditions in a coal-fired power plant. The performance analysis and comparative studies of six materials for the prevention of stack corrosion were investigated. Results: The ion chromatography analysis showed the acid condensation contained fluoride, chloride, nitrate, sulphate, and sulphi...

Peroxo-titanium decorated H-titanate-nanotube-based hierarchical microspheres (PTHM) with a large surface area (368 m(2) g(-1)) and mesoporous structure were prepared by an alkaline hydrothermal method in the presence of H2O2 followed by acid wash, and they exhibited improved activity in degradation of Rhodamine B under visible light irradiation.

The Lewis acid-mediated reactions of allene-ene compounds, derived from 3-methylcitronellal or dimethyl malonate, were carried out using various Lewis acids such as ethylaluminum dichloride, diethylaluminum chloride, titanium chloride, zinc chloride etherate, or boron trifluoride etherate, affording unexpectedly intramolecular [2+2]cycloaddition products under some particular reaction condition...