Aim. A new manufacturing method aiming at to producing more flexible and resistant NiTi endodontic instruments has been recently developed (Hyflex, produced with CM wire). The purpose of the study was to determine whether this new manufacturing method produces NiTi instruments (Hyflex) of superior flexibility and/or superior resistance to cyclic fatigue, when compared with instruments produced ...

Although nickel–titanium (NiTi) rotary files are invaluable tools in dentistry, the relationship between their properties and performance has not been elucidated. Herein, of gold heat-treated (ProTaper Gold ProfaTaper Gold), controlled memory (CM)-wire (HyFlex CM V Taper 2H), T-wire (2Shape), R-phase (K3XF) NiTi was evaluated; non-heat-treated ProFile used as control. The bending, buckling, cyc...

Steel fatigue strength testing is a process that requires large amounts of time, resources and appropriate equipment. The industry seeks to replace cumbersome destructive with non-destructive testing. Coefficients were developed allow the comparison parameters material properties. One such factor coefficient, which allows estimate using known hardness given material. should be for conditions ar...

Rotary-wing flying machines draw attention within the UAV community for their in-place hovering capability, and recently, holonomic motion over fixed-wings. However, they still fall behind in terms of the flight time, power consumption, and safety for centrally-powered and redundant multi-copters have been suggested and studied. In this paper, we investigate about the power-optimality in a mono...

Advanced high strength steels (AHSS) are engineered to have both high strength and enhanced formability characteristics. Yet, the formed components undergo springback due to elastic recovery after removal of the forming tools. This severely affects the dimensional accuracy of the part. Many techniques have been evolved to deal with springback. A simple approach is to design forming tools that c...

Shape Memory Alloys (SMAs) are widely used in endodontics as instruments for root canal preparation namely endodontic rotary files. Despite their high performances, compared to stainless steel instruments, it is still possible enhance cutting efficiency by acting on shape and material properties. As an example, increasing the exhibited reversible martensitic transformation strain makes them mor...

This is a somewhat curious little book which was intended to be a concise note-book for medical, dental and other students to give them a brief idea of the subject before they attend their lectures and practical classes. It is no doubt a novel and ingenious idea on which the author may be congratulated. Blank pages have been put in so that students may draw diagrams from what they actually see ...

Using a dataset of over 1.9 million messages posted on Twitter by about 25,000 ISIS members, we explore how ISIS makes use of social media to spread its propaganda and to recruit militants from the Arab world and across the globe. By distinguishing between violence-driven, theological, and sectarian content, we trace the connection between online rhetoric and key events on the ground. To the be...