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Effect of phosphoric acid etching and self-etching primer application methods on dentinal shear bond strength
Kagan Gokce1, Arzu Aykor, Mustafa Ersoy
1Department of Operative Dentistry, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
The Journal of Adhesive Dentistry
|December 9, 2008
Summary
Acid etching dentin reduced the bond strength of self-etching systems. However, active primer application improved bond strength when used with acid-etched dentin, enhancing dental adhesion.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
Background:
- Self-etching bonding systems are widely used in restorative dentistry.
- Understanding factors influencing dentin bond strength is crucial for clinical success.
Purpose of the Study:
- To investigate the impact of prior acid etching on dentin.
- To assess how different self-etching primer application techniques affect bond strength.
Main Methods:
- Human third molars were divided into four groups with varying surface treatments and primer application.
- Shear bond strength (SBS) was measured using a universal testing machine.
- Statistical analysis included one-way ANOVA and Tukey HSD tests.
Main Results:
- Acid etching significantly decreased dentin shear bond strength compared to non-etched surfaces.
- Active primer application enhanced SBS in acid-etched groups but not in non-etched groups.
- Group A (inactive primer, no etch): 36.0 ± 8.3 MPa; Group B (inactive primer, etch): 24.0 ± 3.9 MPa; Group C (active primer, no etch): 35.0 ± 3.3 MPa; Group D (active primer, etch): 30.6 ± 6.7 MPa.
Conclusions:
- Pre-application acid etching negatively impacts the shear bond strength of this self-etching system to dentin.
- Active application of the self-etching primer can mitigate the negative effects of acid etching on dentin bond strength.
