BACKGROUND In recent times, it has been proposed to classify endodontic files as single-use items due to a perceived inability to adequately clean the instruments. The purpose of the present study was to quantify the surface debris on files removed from the manufacturer's packaging, and after cleaning using an ultrasonic bath or a thermal disinfector. METHODS Stainless steel and rotary nickel...

Abstract. This paper gives a review of research activities at the Institute for Power Electronics and Electrical Drives in Paderborn to the control of rotary travelling wave type ultrasonic motors. Based on a special designed hardware environment an advanced control scheme for inverter-fed travelling wave type ultrasonic motors is presented. After several modelling steps, including an averaged ...

OBJECTIVES The objective of this study was to evaluate the efficacy of erbium-doped yttrium aluminum garnet (Er:YAG) laser irradiation in different energy outputs versus ultrasonic in gutta-percha removal during the endodontic retreatment. MATERIALS AND METHODS A total of 21 extracted human lower premolars were divided into three groups (n = 7). Following the standardized preparation of the r...

AIM To compare the efficacy of irrigation protocols on the removal of triple antibiotic paste (metronidazole, ciprofloxacin and minocycline) (TAP) from artificial grooves in root canals. METHODOLOGY Root canals in 72 extracted single-rooted teeth were prepared using ProTaper rotary instruments up to size F5. The roots were split longitudinally and a standardized groove was prepared in the api...

This article describes four cases with safe and feasible clinical treatment strategies for anterior teeth with pulp canal obliteration (PCO) using cone-beam computed tomography (CBCT), digital radiography (DR), dental operating microscopy (DOM) and ultrasonic tips (US). Four anterior teeth with PCO were chosen. DR was taken with different angulations and analyzed with different filters. Subsequ...

Preparations of apical cavities in resected root ends using rotary burs, with and without citric acid rinse, and ultrasonic tips were compared based on the presence or absence of superficial debris and smear layer. Three groups of 20 extracted teeth each were prepared as follows; I, a size 010 round bur was used to prepare an apical cavity 2-3 mm down the long axis of the root; II, treatment as...

A high-thrust screw-type piezoelectric ultrasonic motor with a three-wavelength exciting mode is proposed in this paper. The motor mainly includes a stator and a screw output shaft, and the stator is composed of twelve rectangular piezoelectric plates and a hollow metal elastomer with an internal thread. The stator can be excited to generate the combined micro ultrasonic vibration mode. With th...

In this paper, a 3D localization method for an indoor flying robot using an Ultrasonic Positioning System (UPS) is described. The high performance localization systems for an indoor flying robot have high-end prices. Therefore, the main objective of this study was to develop a low cost and high performance indoor localization system. In the localization method, the pseudoranges are measured fro...