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Structural analysis of HyFlex EDM instruments.

F Iacono1, C Pirani1, L Generali2

  • 1Endodontic Clinical Section, Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, Bologna, Italy.

International Endodontic Journal
|February 12, 2016
PubMed
Summary
This summary is machine-generated.

Electro-discharge machined (EDM) HyFlex instruments exhibit higher phase transformation temperatures and hardness compared to conventionally manufactured (CM) ones. These findings highlight the enhanced mechanical properties of EDM HyFlex files.

Keywords:
CM wireNiTi endodontic instrumentsdifferential scanning calorimetryelectro-discharge machiningmetallurgical propertiesmicrostructure

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Metallurgy

Background:

  • Nickel-titanium (NiTi) rotary instruments are widely used in endodontics.
  • HyFlex CM instruments are conventionally manufactured, while HyFlex EDM instruments undergo electro-discharge machining.
  • Understanding the material properties of different manufacturing methods is crucial for clinical performance.

Purpose of the Study:

  • To compare the phase transformation behavior, microstructure, nano-hardness, and surface chemistry of electro-discharge machined (EDM) HyFlex instruments with conventionally manufactured (CM) HyFlex instruments.

Main Methods:

  • X-ray diffraction (XRD) and differential scanning calorimetry (DSC) for phase analysis.
  • Nano-indentation to assess nano-hardness and elastic modulus.
  • Field emission-scanning electron microscopy (FE-SEM) and Raman spectroscopy for surface chemistry analysis.

Main Results:

  • HyFlex EDM instruments showed martensite and R-phase, while HyFlex CM instruments had austenite and martensite.
  • EDM instruments exhibited higher austenite finish (Af) temperatures.
  • Significant differences in nano-hardness and elastic modulus were observed between EDM and CM files (P < 0.05).
  • Both EDM and CM files were covered by an oxide layer, with rutile-TiO2 identified.

Conclusions:

  • HyFlex EDM instruments possess unique structural properties, including elevated phase transformation temperatures and increased hardness.
  • The study corroborates previous findings and elucidates the improved mechanical behavior of HyFlex EDM instruments.