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Direct bonding to porcelain

V L Barbosa1, M A Almeida, O Chevitarese

  • 1State University of Rio de Janeiro, Brazil.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|February 1, 1995
PubMed
Summary
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Bonding orthodontic brackets to porcelain requires mechanical surface preparation, not just acidulated phosphate fluoride (APF) gel. Combining mechanical retention with a silane primer significantly improves bond strength for successful porcelain bonding.

Area of Science:

  • Dental Materials Science
  • Orthodontic Adhesion
  • Biomaterials

Background:

  • Porcelain restorations present a challenge for orthodontic bracket bonding.
  • Effective adhesion is crucial for successful orthodontic treatment involving porcelain.

Purpose of the Study:

  • To evaluate the efficacy of different surface preparation methods for bonding orthodontic brackets to porcelain.
  • To determine the optimal combination of mechanical and chemical treatments for enhanced bond strength.

Main Methods:

  • Porcelain cubes were divided into three groups based on surface preparation: sandpaper disk, maintained glaze with APF gel, or coarse diamond bur.
  • Brackets were bonded using various composite resins and priming agents.
  • Shear bond strength was measured to assess bond durability.

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Main Results:

  • Acidulated phosphate fluoride (APF) gel alone did not provide sufficient retention for bracket bonding.
  • Mechanical surface roughening with a coarse diamond bur was essential for adequate bond strength.
  • The use of a silane priming agent further enhanced bond strength through chemical bonding.

Conclusions:

  • Mechanical preparation of the porcelain surface is necessary for reliable orthodontic bracket bonding.
  • Combining mechanical retention with silane priming offers a clinically viable and effective method for bonding to porcelain.