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Shear bond strength of orthodontic brackets treated with Sebond
British Journal of Orthodontics
|August 1, 1995
Summary
Sebond, a substance intended to improve bonding between orthodontic brackets and resins, was tested. However, pretreating bracket bases with Sebond significantly decreased shear bond strength, indicating it weakens the bond.
Area of Science:
- Biomaterials science
- Orthodontics
- Dental materials
Background:
- The interface between stainless steel orthodontic brackets and bonding resins is a clinical weak point due to poor adhesion.
- Sebond was developed as a paste-like substance to enhance this metal-resin bond.
Purpose of the Study:
- To evaluate the effect of pretreating the bracket base with Sebond on the shear bond strength of orthodontic brackets.
- To assess the efficacy of Sebond in improving or maintaining bond strength in orthodontic applications.
Main Methods:
- Two composite resins (Concise Orthodontic Bonding System, Nimetic-Grip) were used with 40 brackets each.
- Brackets were divided into control and Sebond-pretreated groups; some Sebond groups were sandblasted.
- Bonded brackets were stored in water at 37°C for 14 days before shear testing.
Main Results:
- Pretreatment with Sebond significantly reduced the shear bond strength of orthodontic brackets (P < 0.001).
- The study found that Sebond did not strengthen, but rather weakened, the bond between brackets and resin.
Conclusions:
- Pretreating stainless steel orthodontic bracket bases with Sebond negatively impacts shear bond strength.
- Sebond is not effective in strengthening the metal-resin interface and may compromise bond integrity in orthodontic treatment.