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Laboratory evaluation of modern plastic brackets.

Omar Ali1, Margarita Makou, Triantafillos Papadopoulos

  • 1Department of Orthodontics, School of Dentistry, University of Athens, Athens, Greece.

European Journal of Orthodontics
|July 14, 2011
PubMed
Summary

Modern orthodontic plastic brackets vary in composition and design, but most offer adequate enamel bonding. Water immersion significantly reduces bracket hardness, impacting long-term performance.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Orthodontics

Background:

  • Orthodontic plastic brackets offer aesthetic advantages over traditional metal brackets.
  • Understanding the material properties and performance of these brackets is crucial for clinical success.

Purpose of the Study:

  • To evaluate the chemical composition, base morphology, slot roughness, Vickers hardness, and shear bond strength of seven modern orthodontic plastic bracket brands.
  • To assess the impact of water immersion on bracket properties.

Main Methods:

  • Seven orthodontic plastic bracket brands were analyzed for chemical composition, base design, and slot roughness.
  • Vickers hardness and shear bond strength to enamel were tested before and after 12 weeks of water immersion.

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Main Results:

  • Brackets comprised polyurethane, polyoxymethylene, or reinforced polycarbonate; slot materials varied.
  • Vickers hardness significantly decreased after water immersion.
  • Shear bond strength was generally adequate, except for one brand (Spirit MB).
  • Plasticization occurred in all brackets after prolonged water storage.

Conclusions:

  • Most plastic brackets exhibit suitable base structures for effective enamel bonding.
  • Differences in slot roughness exist among brands.
  • Water immersion negatively affects the hardness of plastic orthodontic brackets.