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Related Concept Videos

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Related Experiment Video

Updated: Mar 7, 2026

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
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Orthodontic archwire composition and phase analyses by neutron spectroscopy.

Kun V Tian1,2,3, Giulia Festa2,4,5,6, Francesco Basoli7

  • 1Department of Chemical Science and Technologies, University of Rome Tor Vergata.

Dental Materials Journal
|February 24, 2017
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Summary

Neutron diffraction revealed a martensitic phase in austenitic stainless steel orthodontic wires, impacting their strength and ductility. This finding links manufacturing processes to the wires' mechanical properties.

Keywords:
MartensiteNeutron diffractionOrthodontic archwirePhase transformationStainless steel

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Area of Science:

  • Materials Science
  • Metallurgy
  • Orthodontics

Background:

  • Austenitic stainless steel is widely used in orthodontic archwires.
  • Understanding the phase composition is crucial for predicting mechanical performance.
  • Commercial archwires may exhibit microstructural variations affecting clinical outcomes.

Purpose of the Study:

  • To quantitatively analyze the phase composition of commercial orthodontic archwires.
  • To investigate the presence and extent of martensitic phases.
  • To correlate microstructure with alloying and processing history.

Main Methods:

  • Quantitative phase analysis using neutron diffraction.
  • Neutron resonance capture analysis for atomic and isotopic composition.
  • Complementary analysis with energy dispersive X-ray spectroscopy.

Main Results:

  • Bi-phase structure identified, with significant martensitic phase (45.67% G&H, 6.62% Azdent).
  • Martensitic phase likely results from strain-induced transformation during wire fabrication.
  • Detailed atomic and isotopic compositions were determined.

Conclusions:

  • Neutron diffraction provides precise phase quantification in orthodontic archwires.
  • The presence of martensitic phase is a critical factor influencing mechanical properties like strength and ductility.
  • This study establishes a link between manufacturing processes, microstructure, and the performance of orthodontic materials.