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Related Experiment Videos

Improving orthodontic bonding to silver amalgam

B U Zachrisson1, T Büyükyilmaz, Y O Zachrisson

  • 1Department of Orthodontics, University of Oslo, Norway.

The Angle Orthodontist
|January 1, 1995
PubMed
Summary

This study evaluated bonding orthodontic brackets to amalgam, finding that surface preparation and adhesive choice significantly impact bond strength. Superbond C&B demonstrated superior bonding to sandblasted amalgam compared to other tested materials.

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Area of Science:

  • Dental Materials Science
  • Orthodontic Adhesion
  • Amalgam Bonding

Background:

  • Amalgam, a common dental restorative material, presents challenges for orthodontic bracket adhesion.
  • Optimizing bond strength is crucial for successful orthodontic treatment outcomes.
  • Various surface treatments and adhesive systems exist, but their efficacy with amalgam requires further investigation.

Purpose of the Study:

  • To compare the tensile bond strength of different adhesive systems to prepared amalgam surfaces.
  • To evaluate the influence of surface roughening techniques (sandblasting vs. diamond bur) on bond strength.
  • To assess the effectiveness of intermediate bonding agents in enhancing amalgam-bracket adhesion.

Main Methods:

  • Eighty-four amalgam tabs were prepared using sandblasting or diamond bur roughening.

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  • Mandibular incisor brackets were bonded using Concise, Superbond C&B, Panavia Ex, Geristore, or Concise with intermediate agents (All-Bond 2, SBMP).
  • Tensile bond strength was tested after 24-hour water storage; bond failure sites were analyzed using a modified ARI system.

    • Main Results:

    • Mean tensile bond strengths ranged from 3.4 to 6.4 MPa, significantly lower than control samples (13.2 MPa).
    • Bond failures predominantly occurred at the amalgam/adhesive interface.
    • Superbond C&B yielded the strongest bonds to amalgam, followed by Geristore, Panavia Ex, and Concise.
    • Concise with All-Bond 2 Primers showed comparable strength to Superbond C&B on sandblasted amalgam; SBMP was less effective.

    Conclusions:

    • Amalgam surface preparation and adhesive selection critically influence orthodontic bracket bond strength.
    • Superbond C&B offers the most reliable bonding to prepared amalgam among the tested direct adhesives.
    • Intermediate agents like All-Bond 2 can improve adhesion to sandblasted amalgam, suggesting potential for enhanced clinical application.