This article reviews the use of nickel-titanium rotary files for root canal instrumentation in primary teeth. The pulpectomy technique is described and the advantages and disadvantages of using rotary files are discussed. Specific recommendations for the selection of materials and devices are made.

AIM The aim of this study was to compare the effects of preparation with conventional stainless steel Flexofiles and Gates Glidden burs versus nickel-titanium GT rotary files in the shaping of mesial root canals of extracted mandibular molars. METHODOLOGY A total of 54 canals from 27 mesial roots of mandibular molar teeth were prepared using one of two methods by novice dental students. One c...

The contribution deals with a new holistic approach on the process simulation of Rotary Friction Welding (RFW). The main focus in this regard is on the proper determination of process parameters for new pairs of weld partners in a complete virtual manner. Basis of the simulation is a Carreau fluid material law coupled with the heat transfer problem. The plastic deformations of the flash are map...

Tar formation is the main bottleneck for biomass gasification technology. A novel rotary kiln type biomass gasification process was proposed. The concept design was based on air staging and process separation. This concept was demonstrated on a pilot scale rotary kiln reactor under ambient pressure and autothermic conditions. The pilot scale gasifier was divided into three different reaction re...

Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan 1Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan 2Division of Research and Development, MedTech Heart Inc., 3-24-8 Asakusabashi, Taito-ku, Tokyo 111-0053, Japan 3School o...

The reason for the abnormal wear between the vane-slot and the vane in the rotary compressor is analyzed in this paper. Firstly, the influence of lubrication at the clearance, the machining equipment accuracy and oil circulation (oil flow rate) is analyzed. Then the material characteristics including the hardness of the vane and vane-slot, the surface treatment of the vane and the deformation o...

In this paper, the crack growth and variations of stress intensity factor in rotary disks with central hole is studied. For modeling and analyzing samples, the FRANC2D software is used and to predict stress intensity factor, DACE emulator (Design & Analysis of Computer Experiments) is used and, at the end comparison between results of modeling and results of simulator has been done. The emulato...

statement of problem: root canal cleaning and elimination of the source of infection are the most important basis and the main requirements for successful root treatment since the main cause of failure in root treatment is the permeation of bacteria or their products into the periapical tissues. nowadays, the newly designed and prcsented instruments for canal instrumentation can improve root tr...

This paper presents a method to control the sway of a rotary crane by using a linear transfer transformation (LTT) model. The LTT model is built and its parameters are geometrically derived. Optimal control of a rotary crane is presented using an optimization method of Fletcher-Reeves so that the load has no sway at the end point of the transfer. The effectiveness of the proposed control method...