A process was developed for fabricating arrays of micro-channels in shape-memory NiTi for bone implant applications, with a tailorable internal architecture expected to improve biomechanical compatibility and osseointegration. Ni-51.4 at.% Ti with 24-34 vol.% porosity was fabricated by electrochemical dissolution of parallel layers of steel wire meshes embedded within a NiTi matrix during hot p...

Room temperature monotonic and cyclic stress–strain curves for single crystal and polycrystalline NiTi shape memory alloys containing Ti3Ni4 precipitates are presented. The tensile and compressive single crystal results illustrate the importance of crystallographic texture, the unidirectional nature of the martensitic transformation, and martensite detwinning on tension-compression stress–strai...

INTRODUCTION To evaluate the efficacy of NiTi mechanical rotary instrumentation and Hedstrom file for gutta-percha/sealer removal computed tomography (CT) was utilized in vitro. MATERIALS AND METHODS Thirty extracted human single rooted teeth, each with a single canal were selected. The samples were decoronated with a double faced diamond disk to have 17-mm root; teeth roots were instrumented...

Background: To study rotary retreatment systems in removal of gutta-percha and sealer.Materials methods: A total 15 subjects were enrolled. The samples randomly divided into three groups according to the file system used remove was performed (n=5): ProTaper Universal Retreatment, NEXT Edge File XR NiTi system. p- value less than 0.05 considered statistically significant. Results: percentage roo...

Porous NiTi alloys were prepared by microwave sintering using ammonium hydrogen carbonate (NH4HCO3) as the space holder agent to adjust the porosity in the range of 22-62%. The effects of porosities on the microstructure, hardness, compressive strength, bending strength, elastic modulus, phase transformation temperature and superelasticity of the porous NiTi alloys were investigated. The result...

INTRODUCTION The aim of this study was to assess the extent of adoption, application and the associated issues with the nickel-titanium (NiTi) rotary instruments and techniques amongst endodontists and general dentists in Tehran. MATERIALS AND METHODS A total of 33 questions classified in six categories of demographics, frequency rate of NiTi rotary instrumentation and information. The sample...

Background: The objective of the present study was to measure and compare how length CM Gold Wire Blue NiTi alloy endodontic rotary files impacts their resistance cyclic fatigue. Methods: A total 40 sterile were chosen allocated following groups: (A) 25.06 wire files, 31 mm in (n = 10); (B) 25 (C) 21 (D) 17 10). specialized device designed using artificial root canal systems made from stainless...

We evaluated the mechanical properties and torque/force generated during canal shaping by four NiTi files with innovative designs. Each of 52 TruNatomy Prime, XP-endo Shaper, Spring Endo unheated finish (Spring Endo), heated H) were subjected to bending, buckling, cyclic fatigue, torsional resistance tests (n = 10 per file type). Canal was simulated J-shaped resin blocks 10). Phase transformati...

introduction: the preparation of the root canal space includes debridement, shaping and apical preparation. these procedures are challenging and constitute. the recent introduction of automated techniques for canal preparation has created considerable interest. the aim of this study was to test shaping ability of one hand instrumentation (passive step-back technique) and new rotary niti system ...