نتایج جستجو برای: آلیاژ حافظهدار niti
تعداد نتایج: 5081 فیلتر نتایج به سال:
Introduction The most common approach for obturation of roots, which are treated endodontically, is lateral condensation. Finger spreaders have an essential role in packing the gutta-percha cones. We carried out this research to compare the compaction index of root canal obturation obtained with stainless steel (SS) spreader, nickel-titanium (NiTi) spreader, and different gutta-percha tapers. ...
We have investigated the crystallization of amorphous equiatomic NiTi thin films sandwiched between two protective silicon nitride barrier films using optical, atomic force, and transmission electron microscopy. Crystallite nucleation occurs homogeneously inside the NiTi films because small composition shifts at the interfaces between NiTi and surrounding layers suppress heterogeneous nucleatio...
Nickel-titanium (NiTi) shape-memory alloys (SMAs) have been used in the manufacture of orthodontic wires due to their shape memory properties, super-elasticity, high ductility, and resistance to corrosion. SMAs have greater strength and lower modulus of elasticity when compared with stainless steel alloys. The pseudoelastic behavior of NiTi wires means that on unloading they return to their ori...
An access device using a combination of a compression coil spring made of NiTi shape memory alloy (SMA) and NiTi superelastic strips has been developed. Particular consideration is given to the application of the concept in transanal endocopic microsurgery (TEM), but it could be used in other procedures where tissue expansion is required. In TEM, it could realize the gasless dilation of the rec...
When deposited at room temperature, sputtered NiTi thin films are amorphous and need to be crystallized before they can be used as a functional material. We present the results of an annealing study on substrate-constrained NiTi shape memory thin films. Amorphous films of a NiTi shape memory alloy were deposited by UHV sputtering. Films of thickness 1.0 μm were grown on (100) Si wafers both wit...
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...
در این پژوهش پودر هیدروکسیآپاتیت بعنوان یک سرامیک زیستی به روش الکتروفورتیک بر روی آلیاژ حافظهدار نیکل- تیتانیم پوشش داده شد. محلول سوسپانسیون مورد استفاده n– بوتانول و تری اتانول آمین بود. عملیات رسوبگذاری در ولتاژهای مختلف 20، 30و 40 ولت در زمانهای متفاوت 1 تا 5 دقیقه در ولتاژ ثابت بر روی کاتد انجام گرفت. پس از رسوبگذاری به منظور خشک کردن آهسته، نمونهها در دمای اتاق به مدت 24 ساعت قرار گر...
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...
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