This work studies the effect that argon and nitrogen atmospheres have on structure, phase composition, cytocompatibility, functional properties of porous NiTi alloys obtained by self-propagating high-temperature synthesis. Porous in atmosphere (NiTi-(N)) are characterized brittle interstitial phases Ti4Ni2O(N) appearance a finely dispersed TiNi3 comparison with alloy an (NiTi-(Ar)). An increase...

Resistance to cyclic flexural fatigue failure is an important feature of rotary nickel-titanium (NiTi) instruments. The aim of this study was to evaluate the cyclic flexural fatigue failure resistance of RevoS Shaper Universal rotary NiTi files and to compare it to two other rotary NiTi files with similar size and taper, the Hero Shaper and the ProFile. Fifteen each of Revo-S Shaper Universal, ...

INTRODUCTION The objective of this study was to assess tracheal reactivity after the deployment of different self-expandable metal stents (SEMS). MATERIAL AND METHODS Forty female New Zealand rabbits were divided into four groups. Three groups received three different SEMS: steel (ST), nitinol (NiTi), or nitinol drug-eluting stent (DES); the fourth group was the control group (no stent). Sten...

AIM To determine whether the following can be sterilized by autoclaving - endodontic sponges, rotary nickel-titanium (NiTi) instruments within endodontic sponges, and rotary NiTi instruments with rubber stoppers. METHODOLOGY Sixty-four samples of eight different endodontic sponges (n = 512) were placed into brain heart infusion broth (BHI) for 72 h. An aliquot of this was then spread onto hor...

procedural accidents and obstacles to normally routine therapy, at almost any stage of treatment. One of these procedural problems is intracanal instrument fracture. Fractured root canal instruments may include endodontic files (Figure 1) and Gates Glidden burs. Instruments are made from nickel titanium (NiTi), stainless steel or carbon steel. Fracture often results from incorrect use or overus...

The objective of this work was to study materials subjected to external loading where alternative deformation mechanisms are available to generate strains. In the case of shapememory and superelastic NiTi, these mechanisms are twinning and stress-induced phase transformation, respectively. Superelastic NiTi (51.0 at.% Ni) reinforced with 0, 10 and 20 vol.% TiC particles was fabricated by Hot Is...

In this work, two new low-bandgap electron acceptors NITI-SeS and NITI-SSe that use electron-rich 2-alkylselenopheno[3,4-b]thiophene 2-alkylselenopheno[2,3-c]thiophene with different quinoidal-resonance effect as π-bridges to link the weak electron-donating indenoindene core strong electron-accepting INCN-2F terminal are designed synthesized. has a selenium atom in main ring shows an obviously ...

Frictional resistance is an important counterforce to orthodontic tooth movement during sliding mechanics. This study was carried out to evaluate the effect of ceramic bracket and ceramic bracket with metal slot -archwire‐ ligation combinations on “resistance to sliding” during simulated canine retraction on typodont model. The frictional resistance was tested between Ceramic brackets (3MUNITEK...

Chemomechanical preparation of the root canal includes both mechanical instrumentation and antibacterial irrigation, and is principally directed toward the elimination of micro-organisms from the root canal system. A variety of instruments and techniques have been developed and described for this critical stage of root canal treatment. Since their introduction in 1988, nickel-titanium (NiTi) ro...