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Fluid movement across the resin-dentin interface during and after bonding
1Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan. masanori-h@mue.biglobe.ne.jp
Journal of Dental Research
|October 27, 2004
Summary
This study found that self-etching adhesives provide superior dentin sealing compared to total-etch adhesives. This is because self-etching primers reduce outward fluid flow through dentin tubules, enhancing the bond integrity.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials
Background:
- Water movement across resin-dentin interfaces is a critical factor in adhesive dentistry.
- Understanding fluid dynamics is essential for improving the longevity of dental restorations.
Purpose of the Study:
- To evaluate water penetration through resin-dentin interfaces using different adhesive systems.
- To compare the sealing efficacy of total-etch versus self-etching primer adhesives.
Main Methods:
- In situ measurement of fluid movement across dentin disks using a split-chamber device.
- Evaluation of four adhesive resin systems (2 total-etch, 2 self-etching primer).
- Assessment of fluid shifts during and after bonding procedures under physiological pressure.
Main Results:
- Significant outward or inward fluid shifts were observed during resin application (air-drying and light-curing).
- Total-etch adhesives showed significantly greater fluid movement across resin-bonded dentin compared to self-etching adhesives.
- Self-etching adhesives resulted in superior dentin sealing.
Conclusions:
- Self-etching primer adhesives offer enhanced dentin sealing compared to total-etch systems.
- The milder etching of self-etching primers may preserve hybridized smear plugs, reducing fluid flow.
- This suggests improved clinical performance and durability of restorations bonded with self-etching adhesives.