BACKGROUND and Overview. With the increased use of nickel-titanium (NiTi) rotary instruments for root canal preparation in endodontics, instrument fracture has become more prevalent. Extensive research has been conducted on the physical properties and mechanical characteristics of NiTi rotary instruments, as well as the factors that can contribute to instrument failure. NiTi rotary instruments ...

Rotary encoders for rotational angle detection have been used in a variety of industrial applications, including detection of actuation and travel amounts and motor speed control. In automotive applications, rotary encoders are utilized for steering system angle detection, accelerator pedals and throttle valves to improve vehicle operability and safety. For every automotive application, the nee...

Background Intraradicular procedures remove radicular dentin and jeopardizing longevity of a tooth. Traditional in vitro methods used to determine the remaining dentin thickness (RDT) have limitations. Aim The aim is to evaluate, using cone-beam computed tomography (CBCT), RDT following rotary instrumentation and post space preparation in buccal and palatal roots of maxillary first premolars....

For a 5-axis machine tool, the 3D volumetric tool-tip positioning accuracy is very important for parts accuracy and quality assurance. Just calibrate the 3 linear axes and the 2 rotational axes is not enough. There are straightness errors for each of the 3 linear axes, and squareness errors between the 3 linear axes, misalignment errors between the linear axes and the rotary axes. Hence, it is ...

INTRODUCTION The aim of this in vitro study was to evaluate the transportation of mesiobuccal canals of mandibular first molars prepared with either BioRaCe or Mtwo rotary instruments or hand K-Flexofile, by means of cone-beam computed tomography (CBCT). METHODS AND MATERIALS Forty-five mandibular molars were selected and randomly divided into three groups (n=15). Mesiobuccal roots of these t...

Abstract Nano and micromechanical mass sensing using cantilever oscillators of different length-scales has been an established approach. The main principle underpinning this technique is the shift in resonance frequency caused by additional dynamic system. While object to be sensed useful information, some idea about shape would benefit. information may used make a distinction between two objec...

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In this paper, the general governing equations of three-dimensional vibrations of an Euler-Bernoulli Beam under influences of system dynamics are derived by the Hamiltonian method. Then two fundamental cases of a cantilever beam and a rotating beam are considered. The conventional methods for vibration suppression debit to expenses and make new problems such as control spillover because they ar...