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Effect of self-etching primer application method on enamel bond strength.
Masashi Miyazaki1, Ko Hinoura, Gaku Honjo
1Nihon University School of Dentistry, Department of Operative Dentistry, Tokyo, Japan. miyazaki-m@dent.nihon-u.ac.jp
American Journal of Dentistry
|April 15, 2003
Summary
Active application of self-etching primer significantly enhances enamel bond strength compared to inactive methods. This active technique may improve primer penetration into demineralized enamel surfaces.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
Background:
- Self-etching primers are crucial for dental restorations.
- Optimizing their application method is key to improving bond strength.
Purpose of the Study:
- To evaluate the impact of self-etching primer application technique on enamel bond strength.
- To compare active (agitated) versus inactive (non-agitated) application methods.
Main Methods:
- Five commercial self-etching primer systems were tested on bovine incisor enamel.
- Primers were applied actively (with brush agitation) or passively.
- Resin composite was applied, light-cured, and specimens were subjected to shear bond testing after storage and thermal cycling.
Main Results:
- Active application of self-etching primers resulted in higher bond strengths than inactive application.
- Significant differences favoring active application were observed for Imperva Fluoro Bond, Mac Bond II, and Unifil Bond.
- Active application appears to create a roughened enamel surface and enhance primer penetration.
Conclusions:
- Agitating self-etching primers during application improves enamel bond strength.
- Active application may enhance primer interaction with subsurface demineralized enamel.
- This technique offers a potential method to improve the longevity of dental restorations.