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Related Experiment Videos

Fractured surface characterization: wet versus dry bonding.

M Hashimoto1, H Ohno, M Kaga

  • 1Department of Pediatric Dentistry, School of Dentistry, Hokkaido University, North 13, West 17, Kita-ku, Sapporo 060-8586, Hokkaido, Japan. masanori-h@mue.biglobe.ne.jp

Dental Materials : Official Publication of the Academy of Dental Materials
|January 5, 2002
PubMed
Summary

Wet bonding conditions significantly enhance resin-dentin bond strength compared to dry conditions. Fractographic analysis revealed cohesive failure in wet bonding and hybrid layer failure in dry bonding, impacting overall bond integrity.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials

Background:

  • Establishing durable resin-dentin bonds is crucial for the longevity of dental restorations.
  • Understanding the influence of application conditions on bond strength is essential for clinical success.

Purpose of the Study:

  • To evaluate the resin-dentin bond structures formed under wet and dry conditions using fractographic analysis.
  • To compare the bond strengths of two adhesive systems (Single Bond/SB and All Bond 2/AB2) under varying moisture conditions.

Main Methods:

  • Two adhesive systems were applied to dentin under wet and dry conditions.
  • Tensile bond strength testing was performed, followed by SEM fractographic analysis.
  • Failure modes were quantified using an image analyzer on SEM microphotographs.

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Main Results:

  • No significant difference in bond strength was found between the two adhesive systems under wet conditions.
  • Bond strengths under wet conditions were significantly higher than those under dry conditions for both systems.
  • Fractographic analysis showed cohesive failure in wet-bonded specimens and hybrid layer failure in dry-bonded specimens.

Conclusions:

  • The interaction between the hybrid layer and bonding resin is critical for bond integrity.
  • Wet bonding conditions promote more robust resin-dentin bonds compared to dry conditions.