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Bonded orthodontic retainers: the wire-composite interface

D R Bearn1, J F McCabe, P H Gordon

  • 1Department of Dental Medicine and Surgery, University of Manchester, England.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|January 1, 1997
PubMed
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Bonded orthodontic retainers using multistrand wire and composite show varied clinical performance. Concise Orthodontic composite demonstrated superior bond strength and abrasion resistance in vitro, suggesting improved retainer longevity.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Orthodontics

Background:

  • Bonded orthodontic retainers are crucial for long-term stability.
  • Clinical failures often occur at the wire/composite interface.
  • Evaluating material properties is essential for improving retainer design.

Purpose of the Study:

  • To assess the in vitro performance of various multistrand wires and composite materials for bonded orthodontic retainers.
  • To investigate the influence of composite thickness and surface characteristics on wire retention.
  • To compare the abrasion resistance of different orthodontic composites.

Main Methods:

  • An in vitro model simulating forces at the wire/composite interface was developed.
  • Scanning electron microscopy (SEM) was used to characterize wire surface properties.

Related Experiment Videos

  • Wire detachment forces and abrasion resistance of composites were measured.

    • Main Results:

    • No significant difference in retention was found between different multistrand wire types and diameters.
    • Increased composite thickness over 1.0 mm offered minimal clinical advantage in wire retention.
    • Concise Orthodontic composite exhibited greater detachment force and superior abrasion resistance compared to others tested.

    Conclusions:

    • Material selection, particularly the composite, significantly impacts bonded retainer durability.
    • Concise Orthodontic and Transbond composites show promising abrasion resistance for orthodontic retainers.
    • Further clinical evaluation is recommended based on these in vitro findings for enhanced retainer longevity.