OBJECTIVE (1) To evaluate the corrosion resistance of four different orthodontic archwires and to determine the effect of 0.5% NaF (simulating high fluoride-containing toothpaste of about 2250 ppm) on corrosion resistance of these archwires. (2) To assess whether surface roughness (Ra) is the primary factor influencing the corrosion resistance of these archwires. MATERIALS AND METHODS Four di...

The efficient depolymerization and hydrodeoxygenation of enzymatic hydrolysis lignin are achieved in cyclohexane solvents over a gamma-alumina supported nickel molybdenum alloy catalyst single step. Under initial 3 MPa hydrogen at 320 °C, the highest overall cycloalkane yield 104.4 mg/g with 44.4 wt% selectivity ethyl-cyclohexane was obtained. reaction atmosphere temperature have significant ef...

OBJECTIVES In this in vitro study, the effect of various drying (surface reaction) times of a commercial silane, other than that recommended by the manufacturer (at least 5 min), on the bond strength between the resin composite and silica coated base and noble alloys was evaluated. METHODS A total of 112 disc specimens (9 mm diameter and 0.5 mm thickness) were cast out of two types of alloy d...

Biofilms forming on the surface of biomaterials can cause intractable implant-related infections. Bacterial adherence and early biofilm formation are influenced by the type of biomaterial used and the physical characteristics of implant surface. In this in vitro research, we evaluated the ability of Staphylococcus epidermidis, the main pathogen in implant-related infections, to form biofilms on...

A round-robin experiment *re to be carried out by 6 laboratories in Japan (Nishikawa; Tokyo Inst. Tech., Sakurai and Igata; Univ. of Tokyo, Ishikawa; Hitachi, Tanino; Nippon Steel Corp. and Nakamura; Osaka MT.) under the normal operating condition (T<lOO°K,.~lse fraction-75%~~ Pc10' torr). Fe-Cr-Al and W-25%Re alloys, which are divided fran a single wire were chosen as the specimen materials. A...

Abstract In this work, the crystal structure and (RMSD) root-mean-square displacement of atoms in new cubic refractory interstitial alloys Ti0.74Mo0.26C Ti0.70Mo0.30C were determined by neutron diffraction. These are obtained powder metallurgy sintering fine powders titanium carbides TiC molybdenum MoC. The values RMSD these alloys, methods least squares full-profile analysis from diffraction d...