introduction: mineral trioxide aggregate (mta) as an alternative material to gutta-percha for obturation of root canal in special cases has several drawbacks. the purpose of this study was to compare the apical sealing ability of a new mta-based sealer versus mta. materials and methods: a total of 36 canals of extracted maxillary central incisors were instrumented and randomly divided into 3 ex...

AIM During clinical usage, scaler tips may become worn and reduced in length. It is unknown what effect wear has on the magnitude of scaler tip vibrations when they are utilized under typical clinical loads. The aim of this investigation was to assess the effect of simulated wear on ultrasonic scaler tip displacement amplitude, using a scanning laser vibrometer. MATERIALS AND METHODS A Cavitr...

Entropy coded scaler quantization (ECSQ) performs 1.53 dB from optimal lossy compression at high data rates. In this paper, we generalize this result for distributed source coding with side information. 1-D nested scaler quantization with Slepian-Wolf coding is compared to Wyner-Ziv coding of i.i.d. Gaussian sources at high data rates. We show that nested scaler quantization with Slepian-Wolf c...

In this paper, we present a real-time video system for the transmission of Motion-JPEG2000 codestreams with multiple resolutions. To achieve this multi-resolution video in real-time, a software tool, named ‘stream scaler’, was newly developed. It directly looks at each packet’s location in a codestream before deciding whether it is accepted as a new packet for a scaled codestream. The SOP marke...

Ultrasonic scalers are used in dentistry to remove calculus and other contaminants from teeth. One mechanism which may assist in the cleaning is cavitation generated in cooling water around the scaler. The vibratory motion of three designs of scaler tip in a water bath has been characterised by laser vibrometry, and compared with the spatial distribution of cavitation around the scaler tips obs...

This study used scanning electron microscopy (SEM) to evaluate the morphology and adhesion of blood components on root surfaces instrumented by curettes, piezoelectric ultrasonic scaler and Er,Cr:YSGG laser. One hundred samples from 25 teeth were divided into 5 groups: 1) Curettes; 2) Piezoelectric ultrasonic scaler; 3) Curettes plus piezoelectric ultrasonic scaler; 4) Er,Cr:YSGG laser; 5) Cure...

BACKGROUND Although many studies have compared the properties of ultrasonic scaling instruments, it remains controversial as to which is most suitable for implant scaling. This study evaluated the safety and efficiency of novel metallic ultrasonic scaler tips made by the powder injection molding (PIM) technique on titanium surfaces. METHODS Mechanical instrumentation was carried out using fou...

PURPOSE The aim of this in vitro study of titanium abutments was to investigate the extent of treatment traces, the roughness depth, and the quantity of titanium or, in the case of coated abutments, titanium nitride (TiN) removed from the surface after treatment with various instruments. MATERIALS AND METHODS Eleven uncoated, mechanically smoothed abutments and 11 TiN-coated abutments were us...