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Material testing of reconditioned orthodontic brackets.

S Reimann1, A Rewari, L Keilig

  • 1Oral Medical Technology, Friedrich-Wilhelms University of Bonn, Germany. susanne.reimann@uni-bonn.de

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Orthodontic bracket recycling negatively impacts corrosion resistance and dimensional stability. These risks outweigh potential savings, making single-use labeling a crucial patient safety measure.

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Area of Science:

  • Materials Science
  • Biocompatibility
  • Dental Materials

Background:

  • Orthodontic brackets are labeled for single use by manufacturers.
  • Commercial providers offer bracket reconditioning services.
  • The impact of recycling on bracket material properties requires investigation.

Purpose of the Study:

  • To evaluate the effects of various recycling techniques on orthodontic brackets.
  • To assess material-related parameters including corrosion, hardness, and dimensional stability.
  • To determine the clinical viability and safety of recycled orthodontic brackets.

Main Methods:

  • Compared new brackets to those reconditioned via direct flaming, acid bath, commercial unit, and outsourcing.
  • Assessed corrosion behavior, surface features, Vickers hardness, shear bond strength, slot dimensions, and frictional loss.
  • Utilized static immersion testing, mass spectrometry, SEM, hardness testing, light microscopy, and an orthodontic measurement and simulation system (OMSS).

Main Results:

  • Acid bath and commercial recycling methods caused significant dimensional changes in brackets.
  • Corrosion resistance varied based on the recycling technique used.
  • No significant differences were found in nickel-ion release, frictional loss, or shear bond strength.

Conclusions:

  • Recycling orthodontic brackets compromises their corrosion resistance and dimensional stability.
  • The risks associated with recycled brackets are not justified by cost savings.
  • Single-use labeling is a necessary precaution for patient and clinician safety.