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Related Experiment Videos

Plastic brackets: hardness and associated clinical implications.

Theodore Eliades1, Christiana Gioka, Spiros Zinelis

  • 1Biomaterials Laboratory, School of Dentistry, University of Athens, Athens, Greece. teliades@ath.forthnet.gr

World Journal of Orthodontics
|December 24, 2004
PubMed
Summary

In vitro aging did not alter plastic bracket hardness, but retrieved brackets showed reduced hardness and degradation. This highlights limitations in simulating intraoral aging effects in laboratory settings for orthodontic brackets.

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Area of Science:

  • Orthodontic Materials Science
  • Biomaterials Engineering

Background:

  • Plastic orthodontic brackets offer aesthetic advantages but their long-term durability requires evaluation.
  • Understanding material degradation is crucial for predicting clinical performance and longevity.

Purpose of the Study:

  • To compare the Vickers hardness of plastic brackets after in vitro aging versus retrieved clinical samples.
  • To evaluate the reliability of in vitro aging models in replicating intraoral degradation effects on plastic brackets.

Main Methods:

  • Four types of plastic brackets were subjected to in vitro aging in a buffer solution.
  • Retrieved brackets from orthodontic patients were also analyzed.
  • Knoop hardness testing and scanning electron microscopy (SEM) were used to assess material properties and morphology.

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Main Results:

  • No significant difference in hardness was observed between new and in vitro-aged brackets.
  • Retrieved brackets exhibited a significant reduction in hardness compared to their as-received counterparts.
  • SEM revealed evidence of material degradation in retrieved brackets, indicating intraoral aging effects.

Conclusions:

  • The in vitro aging model used in this study did not accurately simulate the degradation observed in clinical settings.
  • Clinical implications for torque control, friction, and tie-wing strength of plastic brackets are significant due to intraoral degradation.