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Related Experiment Videos

Diffusion-induced water movement within resin-dentin bonds during bonding.

Masanori Hashimoto1, Franklin R Tay, Hidehiko Sano

  • 1Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Sapporo, Hokkaido, Japan. masanori-h@mue.biglobe.ne.jp

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|May 2, 2006
PubMed
Summary

Water movement through resin-dentin bonds is a key factor in bond degradation. This study shows prolonged adhesive infiltration reduces water permeability, enhancing bond durability.

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Area of Science:

  • Biomaterials Science
  • Dental Adhesion
  • Materials Science

Background:

  • Water-filled channels and nanovoids in resin-dentin bonds are implicated in bond degradation and collagen hydrolysis.
  • The pathways for water ingress into bonded interfaces remain unclear, posing a challenge for long-term dental restorations.

Purpose of the Study:

  • To investigate the phenomenon of diffusion-induced water uptake across resin-dentin interfaces during the dental bonding process.
  • To evaluate the impact of different adhesive systems and bonding procedures on water permeability.

Main Methods:

  • Utilized two light-cured (Excite, One-Step Plus) and one chemical-cured (Amalgambond Plus) adhesive systems.
  • Employed a split-chamber device to measure fluid movement across dentin disks under physiological pressure, both during and after bonding.

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  • Assessed the effect of a 6-minute dark storage interval before light-curing to evaluate water diffusion through uncured monomers and prolonged infiltration.

    • Main Results:

    • Water gradients generated during bonding procedures drive fluid movement across dentin-adhesive interfaces.
    • Prolonged adhesive infiltration time significantly reduced water permeability in resin-dentin bonds for light-cured adhesives.
    • Variations in adhesive formulation influenced the extent of diffusion-induced water movement and the final water content within bonds.

    Conclusions:

    • Water movement across resin-dentin interfaces is a significant factor influenced by bonding procedures and adhesive properties.
    • Optimizing adhesive infiltration time can mitigate water permeability, potentially improving the longevity of resin-dentin bonds.
    • Adhesive chemical composition plays a crucial role in determining water uptake and its implications for bond degradation.