background: different techniques have been introduced to improve removing the calcium hydroxide intra-canal dressing. the purpose of this study was to compare the effi ciency of passive ultrasonic irrigation (pui) and rinsendo system in the removal of calcium hydroxide from root canal system. materials and methods: access cavities were prepared in 50 single-rooted anterior teeth. cleaning and s...

Objectives . Our aim was to study the dielectric properties of 4-n-pentyloxybenzoic acid– N-(4-n-butyloxybenzylidene)-4’-methylaniline system and reveal how different concentrations additives affect acid. Methods System were investigated using polarization thermomicroscopy dielcometry. Results We found that anisotropy changes its sign from positive negative at transition temperature high-temper...