Adult rats spontaneously vocalize in ultrasonic frequencies. Although these ultrasonic vocalizations (USVs) have been described as by-products of locomotor activity or social signals, accumulating evidence suggests that they may also index anticipatory affective states. Converging ethological, pharmacological, and brain stimulation research indicates that whereas long low-frequency (> 0.3-s, ap...

Measurements have been made of ultrasonic shear wave attenuation and sound velocity in highly textured polycrystalline samples of Bi~SrzCaCuzOs+,in magnetic fields up to 9 telsa and at temperatures down to 4.2 K. Magnetic field dependent attenuation peaks and velocity enhancements were found that are in good agreement with theoretical predictions based on the assumptions of the thermally assist...

Introduction: various irrigation devices and chemical solutions are being developed improved nowadays for better penetration deep into the complex root canal system. Activation of irrigating enhances solution effectiveness. Evidence in literature suggests that ultrasonic is much more effective this respect than syringe alone. Passive (PUI) and/or ultrasonically activated (UAI): nowadays, two te...

An ultrasound-assisted activation method for electroless silver plating is presented in this study. When the ultrasound was applied during the activation step, the amount of the Pd species adsorbed on substrate surfaces was higher than that of sample pretreated with a conventional activation process without ultrasound irradiation. With this activation method, it was also shown that the adsorbed...

INTRODUCTION Biofilms of resistant species such as Enterococcus faecalis pose a major challenge in the treatment of root canals with established periapical disease. This study examined the effects of gaseous ozone delivered into saline on biofilms of E. faecalis in root canals of extracted teeth with and without the use of passive ultrasonic agitation. METHODS Biofilms of E. faecalis were est...

Correspondence to: Regina M. Puppin-Rontani Department of Pediatric Dentistry Piracicaba Dental School University of Campinas Av. Limeira 901, 13414-018 Piracicaba – SP – Brasil. Phone: 55 19 3412 5286 Fax: 55 19 3412 5218 E-mail: [email protected] Abstract This paper review is key issue to known that the adequate endodontic techniques accomplished on primary and permanent teeth regarding...

ultrasonic machining (usm) is a mechanical material removal process used to erode holes and cavities in hard or brittle work pieces by using shaped tools, high-frequency and an abrasive slurry. this paper addresses the concept and development of an expert system (es) for hard and brittle material, such as glass, quartz, diamond, carbides, semi conducting materials, ceramic and graphite which ca...

Obtaining the cleanest canal possible before obturation is one of the goals of endodontic treatment. The purpose of this study was to compare the smear layer removal capability of ethylenediamine tetra-acetic acid (EDTA) application with passive ultrasonic and cotton wrapped on reamer activation. Twelve extracted human teeth with single root canals were used for the study. They were conventiona...