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Resin-tooth adhesive interfaces after long-term function.

M Hashimoto1, H Ohno, M Kaga

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

American Journal of Dentistry
|November 9, 2001
PubMed
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Dental adhesive interfaces degrade over time in the oral environment. Scanning electron microscopy revealed collagen fibril digestion and deterioration of bonding resin and hybrid layers after years of function.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Scanning Electron Microscopy (SEM)

Background:

  • Dental adhesives are crucial for restoring carious teeth.
  • Long-term stability of resin-dentin bonds in the oral environment is critical for restoration longevity.
  • Understanding degradation mechanisms is essential for developing more durable dental materials.

Purpose of the Study:

  • To characterize the morphology of dentin adhesive interfaces after prolonged function in the oral cavity.
  • To investigate the effects of the oral environment on the structural integrity of resin-dentin bonds using SEM.

Main Methods:

  • Primary molars with carious lesions were restored in vivo using a dentin adhesive system.
  • Restored teeth were extracted after several years upon eruption of permanent successors.

Related Experiment Videos

  • Extracted teeth were cross-sectioned and polished for SEM examination of the adhesive interface.

    • Main Results:

    • Significant morphological changes were observed at the adhesive interfaces.
    • Degradation included digestion of collagen fibrils and deterioration of the bonding resin and hybrid layer.
    • These findings indicate degradation of resin-dentin bond structures occurs in the human oral environment over time.

    Conclusions:

    • The oral environment induces degradation of dental adhesive interfaces.
    • Long-term functional stability of resin-dentin bonds is compromised by biological and chemical factors.
    • Further research is needed to enhance the durability of dental adhesive systems.