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Influence of conditioning time on enamel adhesion
Jorge Perdigão1, George Gomes, Maria Manuela Lopes
1University of Minnesota, Division of Operative Dentistry, Department of Restorative Sciences, 8-450 Moos Tower, 515 SE Delaware Street, Minneapolis, MN 55455, USA. perdi001@umn.edu
Quintessence International (Berlin, Germany : 1985)
|January 25, 2006
Summary
Increasing enamel conditioning time for self-etch adhesives may improve bond strength, especially for those with higher pH. Lower pH adhesives generally show higher bond strengths regardless of conditioning duration.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- Self-etch adhesives are widely used in dental restorations.
- Optimizing application protocols is crucial for achieving durable bonds.
- Enamel conditioning time is a variable that can influence adhesive performance.
Purpose of the Study:
- To evaluate the effect of extended enamel conditioning time on the bond strengths of four self-etch adhesives.
- To investigate the relationship between the pH of self-etch adhesives and their enamel bond strengths.
- To compare the performance of self-etch adhesives with a total-etch control.
Main Methods:
- Four self-etch adhesives (AdheSE, Adper Prompt L-Pop, Clearfil SE Bond, Tyrian SPE/One-Step Plus) and one total-etch control (Prime & Bond NT) were tested.
- Enamel surfaces were conditioned according to manufacturer's instructions and with double the recommended time.
- Tensile bond strengths were measured after specimen preparation.
- The pH of the adhesives and correlation with bond strength were analyzed.
Main Results:
- Adhesives with lower pH (Tyrian SPE, Prime & Bond NT) exhibited higher bond strengths.
- Extending conditioning time significantly increased bond strengths for AdheSE and Clearfil SE Bond (higher pH adhesives).
- A significant positive correlation was observed between adhesive pH and mean bond strengths.
Conclusions:
- Doubling enamel conditioning time can enhance bond strengths for certain self-etch adhesives.
- Adhesive pH is a critical factor influencing enamel bond strength.
- Optimizing conditioning time may be beneficial for specific self-etch adhesive systems.
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