INTRODUCTION Instrument separation is a serious concern in endodontics. Stainless steel instruments usually deform before they separate whereas Nickel Titanium instruments do not show any sign of deformation. AIM of the present study was to compare the cyclic rotations needed to fracture three different rotary nickel titanium endodontic instruments namely Profile, K3 Endo, RaCe in simulated c...

Rolling bearing is main part of rotary machine. It is frail section of rotary machine. Its running status affects entire mechanical equipment system performance directly. Vibration acceleration signals of the third finishing mill of Anshan Steel and Iron Group wire plant were collected in this paper. Fourier analysis, power spectrum analysis and wavelet transform were made on collected signals....

INTRODUCTION The purpose of this study was to compare the accuracy of working length (WL) measurements by using the Root ZX II, Apex NRG XFR, and Mini Apex Locator with rotary nickel-titanium (NiTi) instruments. METHODS Twenty-eight teeth had their WLs determined with each electronic apex locator (EAL) by using 0.04 taper ProFiles sizes 40-20 in a crown-down technique until WL was reached. Fo...

INTRODUCTION The aim of the present work was to evaluate the resistance to flexural fatigue of Reciproc R25 nickel-titanium files, 25 mm, used in continuous rotation motion or reciprocation motion, in dynamic assays device. METHODS Thirty-six Reciproc R25 files were divided into 2 groups (n = 18) according to kinematics applied, continuous rotary (group CR) and reciprocation motion (group RM)...

Nowadays, due to the escalation in construction of high-rise structures, the need for selecting a proper resistant structural system against earthquake and wind has increased significantly. These systems should show an optimized use of materials and should be presented as a hard and efficient structure. A good example of a high efficient system in high-rise buildings can be indicated is, the tu...

Abstract Belt conveyors are used for transporting bulk materials over distances. The core of the belt, by transferring longitudinal stresses and ensuring proper frictional coupling enables belt movement transportation on its surface. As cover edges used, becomes abraded, is subject to fatigue. result development cracks in rubber covers across which leads damage not only along cables (the natura...

Abstract The main objective of this study was to analyze the microstructural characteristics and strength performance dissimilar AISI 431 steel/AISI 1018 steel joints developed using rotary friction welding. different regions rod-to-plate were analyzed optical microscopy. tensile properties microhardness evaluated assess joint performance. distribution across cross-sectional region recorded cor...

Breaks in the so-called “continuous” (unspliced) belt sections, and not spliced areas, are infrequent but do happen practice. This article presents some aspects, which may account for such breaks conveyor belts. It indicates “sensitive points” design, especially transition section of identifying actual strength belt. The presented results include influence width a specimen on identified tensile...