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Bonding orthodontic brackets to porcelain using different adhesives/enamel conditioners: a comparative study
Samir E Bishara1, Raed Ajlouni, Charuphan Oonsombat
1Department of Orthodontics, College of Dentistry, University of Iowa, 220 Dental Science S, Iowa City, IA 52242-1001, USA Linda-keller@uiowa.edu
World Journal of Orthodontics
|March 30, 2005
Summary
Bonding orthodontic brackets to porcelain requires careful material selection. Microetching with hydrofluoric acid and silane offers the strongest bond, but can damage the porcelain surface.
Area of Science:
- Dental Materials Science
- Orthodontics
- Biomaterials Engineering
Background:
- Porcelain restorations present unique challenges for orthodontic bracket bonding due to their smooth, non-porous surfaces.
- Traditional bonding methods may yield suboptimal shear bond strength, potentially leading to clinical complications.
Purpose of the Study:
- To evaluate the efficacy of novel adhesive and primer systems in enhancing the shear bond strength of orthodontic brackets bonded to porcelain.
- To compare the performance of an experimental self-etch primer and a cyanoacrylate adhesive against conventional methods.
Main Methods:
- Sixty porcelain-veneered teeth were divided into four groups, each receiving a different surface treatment and bonding agent.
- Groups included: phosphoric acid etch with composite, microetch/hydrofluoric acid/silane with composite, self-etch primer with composite, and phosphoric acid etch with cyanoacrylate.
Main Results:
- Significant differences in shear bond strength were observed among the groups (p < 0.001).
- Microetching followed by hydrofluoric acid and silane application yielded the highest shear bond strength (5.5 ± 2.7 MPa).
- Cyanoacrylate adhesive and conventional phosphoric acid etching resulted in the lowest bond strengths.
Conclusions:
- Phosphoric acid etching with either cyanoacrylate or composite adhesive leads to significantly weaker bonds on porcelain.
- Self-etch primers offer improved, though less consistent, shear bond strength.
- Microetching with hydrofluoric acid and silane is the most effective method for bonding orthodontic brackets to porcelain, despite potential surface damage.