background: ultrasonic vibrations are used to remove a cemented post from a root canal requiring endodontic retreatment. various results have been reported from the studies that evaluated the effect of ultrasonic instruments in removing the posts cemented with resin cements. the aim of this study was to evaluate the effect of ultrasonic energy on the retention of prefabricated metal post cement...

Sound attenuation and internal friction coefficients are calculated for a realistic model of amorphous silicon. It is found that, contrary to previous views, thermal vibrations can induce sound attenuation at ultrasonic and hypersonic frequencies that is of the same order or even larger than in crystals. The reason is the internal-strain induced anomalously large Grüneisen parameters of the low...

Sound attenuation and internal friction coefficients are calculated for a realistic model of amorphous silicon. It is found that, contrary to previous views, thermal vibrations can induce sound attenuation at ultrasonic and hypersonic frequencies that is of the same order or even larger than in crystals. The reason is the internal strain induced anomalously large Grüneisen parameters of the low...

A study is presented of a miniature ultrasonic surgical drill designed for bone biopsy, based on an ultrasonic/sonic drill which converts high frequency to low frequency vibrations through a freely vibrating mass between an ultrasonic transducer-horn and a drill bit. For conventional surgical drilling using a rotary drill or an ultrasonic drill, considerable power is required to penetrate into ...

The paper provides a comparative analysis of the influence ring concentrator shape in ultrasonic systems on their amplitude-frequency characteristics. Devices are known which elastic elements used either as resonators or working tools technological systems. However, use concentrators vibrations is insufficiently studied and requires comprehensive research development recommendations for practic...

The present state research overviews on the use of ultrasonic vibrations in press joints. main effect occurring ultra-sonic activation for pressed parts is friction force break. works investigating ultrasound various materials, as well application this pressing are viewed article.

We propose an ultrasound (US)-based technique for imaging vibrations in the blood vessel walls and surrounding tissue caused by eddies produced during flow through narrowed or punctured arteries. Our approach is to utilize the clutter signal, normally suppressed in conventional color flow imaging, to detect and characterize local tissue vibrations. We demonstrate the feasibility of visualizing ...