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Nanoleakage at the dentin adhesive interface vs microtensile bond strength
S J Paul1, D A Welter, M Ghazi
1Medical College of Georgia, School of Dentistry, Department of Oral Biology/Physiology, Augusta 30912-1129, USA.
Operative Dentistry
|October 26, 1999
Summary
Longer etching times did not significantly affect the microtensile bond strength of Single Bond adhesive. However, increased etching duration led to greater silver ion leakage, raising concerns about long-term bond durability.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials
Background:
- Over-etching dentin can compromise adhesive infiltration and bond strength.
- Understanding the impact of etching duration on dentin bonding is crucial for clinical success.
Purpose of the Study:
- To investigate how extended etching times influence the microtensile bond strength of Single Bond.
- To assess silver ion leakage within the hybrid layer as an indicator of nanoleakage and bond integrity.
Main Methods:
- Occlusal dentin was etched for 15, 30, or 60 seconds using 35% phosphoric acid.
- Single Bond adhesive was applied, followed by Z100 composite, and specimens were tested for microtensile bond strength.
- Nanoleakage was quantified using silver nitrate staining, laser ablation inductively coupled plasma mass spectrometry, and SEM analysis.
Main Results:
- Microtensile bond strength remained consistent across different etching times, averaging approximately 38 MPa.
- Silver ion uptake, indicative of nanoleakage, significantly increased with longer etching durations.
- Short-term analysis showed no detrimental effect of over-etching on bond strength.
Conclusions:
- While Single Bond exhibits stable short-term bond strength despite over-etching, increased nanoleakage suggests potential long-term degradation.
- Optimizing etching time is essential to balance effective demineralization with maintaining hybrid layer integrity and bond durability.