Background: The present study aimed to evaluate the prevalence of substance abuse among students of selected schools of Tehran University of Medical Sciences, Iran.Methods: This was a cross-sectional study among students in five schools of Tehran University of Medical Sciences in 2014. Data collection was conducted using a questionnaire which was designed by the researcher. Questionnaires were ...

Hydrophobically modified ethoxylated urethanes have been synthesized using polyethylene glycol, hexamethylene diisocyanate and cetyl alcohol. These types of thickeners are categorized as nonionic associative thickeners. The HEURs were prepared in two steps. Initially an ethoxylated urethane prepolymer was synthesized through a reaction between a polyethylene glycol (Mn=6000) and hexamethylene d...

Background and Aim: The purpose of this study was to examine the effect of alcohol and non-alcohol mouthwashes on the color change of two types of bleach shade composite. Materials and Methods: Twenty-two samples of IPS empress direct composite (Ivoclar Vivadent, Schaan, Liechtenstein) and 22 samples of Vitalescence snow white composite (Ultradent Products, South Jordan, UT, USA) were prepared...

BiFeO3 (BFO), Bi0.86Sm0.07Eu0.07FeO3 (BSEFO), and Bi0.86Sm0.07Cd0.07FeO3 (BSCFO) nano powders were prepared by the sol-gel combustion method and the catalytic performances were evaluated in the acetylation reaction of benzyl alcohol. The physical chemical properties of the catalysts were character...

addiction to drugs, such as heroin, cocaine and alcohol, exacts great human and financial costs on society. various evidence-based pharmacological and psychosocial interventions are currently used in the treatment of drug addiction but they do not produce adequate therapeutic benefits in every patient. further, barriers such as financial cost, lack of availability, or perceptions of existing tr...