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Related Experiment Videos

Improving orthodontic bonding to gold alloy

T Büyükyilmaz1, Y O Zachrisson, B U Zachrisson

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

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|November 1, 1995
PubMed
Summary

Sandblasting significantly improves dental bracket bond strength on gold alloy compared to diamond bur roughening. Superbond C&B offers superior bonding to gold alloy over Concise, with minimal impact from thermocycling.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Orthodontic Technology

Background:

  • Dental bracket bonding to gold alloys is crucial for orthodontic treatment.
  • Optimizing surface treatments and adhesive systems is essential for reliable bond strength.
  • Understanding bond failure mechanisms informs material selection and clinical protocols.

Purpose of the Study:

  • To evaluate the tensile bond strength of orthodontic brackets bonded to cast gold alloy using different surface treatments and adhesive systems.
  • To compare the effectiveness of aluminum oxide sandblasting and diamond bur roughening on gold alloy surfaces.
  • To assess the performance of Bis-GMA and 4-META based adhesives under varying conditions.

Main Methods:

  • Tested tensile bond strength of edgewise brackets bonded to gold alloy tabs (n=156) with three surface treatments: diamond bur, sandblasting, and sandblasting with tin plating.

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  • Utilized Concise (Bis-GMA) and Superbond C&B (4-META) adhesives, with and without intermediate resins/primers.
  • Specimens underwent 24-hour water storage or 1,000 thermocycles (5°C-55°C) before testing.

    • Main Results:

    • Sandblasting significantly enhanced bond strength to gold alloy compared to diamond bur treatment.
    • Superbond C&B demonstrated significantly higher bond strength to gold alloy than Concise.
    • Thermocycling had minimal effect on bond strength; failure modes differed between adhesives.

    Conclusions:

    • Aluminum oxide sandblasting is a superior surface preparation method for bonding orthodontic brackets to gold alloys.
    • 4-META based adhesives like Superbond C&B provide more reliable bonds to gold alloys than Bis-GMA based adhesives.
    • Surface treatment and adhesive choice significantly influence bond durability in orthodontic applications.