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Related Experiment Videos

Deproteinizing effects on resin-tooth bond structures.

Eiji Yoshida1, Masanori Hashimoto, Minoru Hori

  • 1Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan. eyoshida@den.hokudai.ac.jp

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|December 23, 2003
PubMed
Summary

Sodium hypochlorite (NaOCl) exposure significantly reduces resin-tooth bond strength over time. This degradation impacts both enamel and dentin bonds, compromising long-term dental restorations.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesion Science

Background:

  • Long-term durability and caries invasion are critical factors affecting resin-tooth bond longevity.
  • Understanding the degradation mechanisms of resin-tooth bonds under simulated oral conditions is essential for improving restorative material performance.

Purpose of the Study:

  • To investigate the effects of sodium hypochlorite (NaOCl) on the bond strength and interfacial integrity of resin-tooth bonds.
  • To simulate the impact of long-term durability and potential caries invasion on dental adhesive systems.

Main Methods:

  • Two resin adhesive systems (Excite and One-Bond) were used to create resin-tooth bonded specimens.
  • Specimens were immersed in 10% NaOCl for varying durations (0, 2, 4, 6 hours) after 24-hour water storage.

Related Experiment Videos

  • Microtensile bond strength tests, SEM fractography, and TEM examination of the adhesive interface were performed.

    • Main Results:

    • Bond strengths decreased with increased NaOCl immersion time for both enamel and dentin bonds.
    • Deterioration of mineralized dentin contributed to reduced resin-enamel bond strength.
    • For resin-dentin bonds, NaOCl caused gradual dissolution of the adhesive interface and depletion of collagen fibrils, leading to hybrid layer deformation.

    Conclusions:

    • NaOCl exposure significantly degrades resin-tooth bond strength, particularly in dentin.
    • Morphological changes at the adhesive interface, including collagen depletion and hybrid layer deformation, are responsible for the observed bond strength reduction.
    • These findings highlight the vulnerability of resin-tooth bonds to chemical degradation, impacting the longevity of dental restorations.