INTRODUCTION This study set out to compare the efficacy of laser-activated and ultrasonically activated root canal disinfection with conventional irrigation, specifically its ability to remove bacterial film formed on root canal walls. METHODS Seventy human premolars were shaped to an apical size #20, taper .07, sterilized, and contaminated in situ with oral bacteria for 1 week and incubated ...

Ultrasonically-assisted bone cutting with high precision has manyadvantagesfororthopedic surgeries. However, irregular crack propagation, large fractured chips, and surface damagemay occurduring the processdue to brittleness anisotropy of cortical bone. These can be minimized by optimizing operating parameters tool; frequency, amplitude, speed, depth, temperature, inconsideration toughening mec...

OBJECTIVE We conducted this prospective study to expand available information in relation to serum phosphate levels in treatment of acute asthma. A β-adrenergic agonist, salbutamol, was used for this purpose. MATERIAL AND METHODS Twenty-six patients who met the inclusion criteria as; age over 16 years, asthma history, and an acute exacerbation were included. Serum blood urea nitrogen, creatin...

BACKGROUND Fractional expired nitric oxide (FENO ) is decreased after exercise. The effect of exercise in the cold upon FENO is unknown. PURPOSE To examine changes in FENO after a short, high intensive exercise test in a cold and in a temperate environment. METHODS Twenty healthy well-trained subjects (eight females) aged 18-28 years performed an 8-min exercise test at 18°C (SD = 1.0) and -...

size reduction of high energy materials such as 1, 3, 5, 7-tetranitro- 1, 3, 5, 7-tetraaza cyclooctane (hmx) has considerable influences on improving their explosive characteristics. in this study, nanosized hmx par­ticles were produced using ultrasonically reprecipitation method by applying water as a safe and accessible antisolvent instead of unsafe conventional methods. sem photographs revea...

Kelner (J. Bacteriol., 65, 252, 1953), has found that ultraviolet irradiation inhibits deoxyribonucleic acid synthesis in Escherichia coli strain B/r. He sometimes observed a resumption of this synthesis after a certain period of postirradiation incubation. This has also been reported by Kanazir and Errera (Cold Spring Harbor Symposia Quant. Biol., 21, 19, 1956). As most of the irradiated cells...

Pursuing the aim of improving current waste plastics management strategy, we have investigated co-hydrocracking high-density polyethylene (HDPE) with vacuum gasoil (VGO) over a PtPd/HY catalyst for converting this blend into high-quality fuels. In particular, work was focused on assessing effects reaction time product yields and composition gas, naphtha light cycle oil (LCO) fractions, which de...