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Published on: July 30, 2007
Orthodontic bonding with varying curing time and light power using an argon laser
Bryan S Elvebak1, P Emile Rossouw, Barbara H Miller
1Department of Orthodontics, Baylor College of Dentistry, Dallas, TX 75246, USA.
The Angle Orthodontist
|October 13, 2006
Summary
Shorter curing times and lower light intensities can achieve the same shear bond strength for orthodontic brackets as longer times and higher intensities. This finding optimizes adhesive composite curing for stainless-steel brackets.
Area of Science:
- Orthodontic Materials Science
- Biomaterials Engineering
- Dental Adhesives
Background:
- Achieving optimal shear bond strength is critical for the clinical success of orthodontic brackets.
- Understanding the impact of light-curing parameters on adhesive composite performance is essential for predictable bracket bonding.
Purpose of the Study:
- To evaluate the influence of varying argon laser curing times and light intensities on the shear bond strength of adhesive composites used for stainless-steel orthodontic brackets.
Main Methods:
- 154 bovine incisors were bonded with adhesive-precoated (APC) stainless-steel brackets using an argon laser at four power settings (100-250 mW) and four exposure times (5-20 seconds).
- Shear bond strength was tested using an Instron universal testing machine, and failure modes were assessed with the adhesive remnant index (ARI).
Main Results:
- The adhesive remnant index (ARI) did not show a significant difference in bond failure location based on exposure time (P = .40).
- However, the light power setting significantly influenced the location of bond failure (P = .03).
Conclusions:
- Optimal shear bond strength can be achieved with shorter exposure times and lower light power settings.
- These findings suggest that efficient and effective curing of adhesive composites for orthodontic brackets is possible without prolonged exposure or high-intensity light.
