OBJECTIVE To compare cleaning effectiveness by histological analysis of a reciprocating single-file system with ProTaper rotary instruments during the preparation of curved root canals in extracted teeth. METHODS A total of 40 root canals with curvatures ranging between 20 - 40 degrees were divided into two groups of 20 canals. Canals were prepared to the following apical sizes: Reciproc size...

The automobile engine connecting rod is a high volume production, critical component. It connects reciprocating piston to rotating crankshaft, transmitting the thrust of the piston to the crankshaft. Every vehicle that uses an internal combustion engine requires at least one connecting rod depending upon the number of cylinders in the engine. As the purpose of the connecting rod is to transfer ...

During the electrophysiologic study of 435 patients referred for evaluation of WolffParkinson-White syndrome, 42 (10%) had preexcited reciprocating tachycardia (defined as a macroreentrant tachycardia that used an accessory atrioventricular [AV] pathway for antegrade conduction). The ages of the patients ranged from 9 to 67 years (27 + 14). Thirty-three were male patients, nine female, and eigh...

The given paper is aimed at constructing the general circuit of heat processes in a semihermetic reciprocating refrigerant compressor as a basis of application of new ecology-friendly refrigerants as well as optimizing design parameters of compressor. While performing this work the following problems were solved: 1. Experimental research of heat processes in a semihermetic refrigerant reciproca...

The growth of the fleet rolling stock motor transport increases requirements for road safety, which is largely determined by operational reliability and technical condition components mechanisms chassis. In many countries, large-scale studies are being conducted related to problems improving quality, durability vehicles technological equipment based on repair kits, as well manufacturing assembl...

The purpose of the present study is to clarify effect surface texturing on lubrication characteristics a sliding under reciprocating motion and develop design guidelines for in order obtain lower friction. To achieve this purpose, with dimple-shaped during are numerically analyzed by solving Reynolds equation. effects compared those no various operating conditions as determined from speed, visc...