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Related Experiment Videos

Chlorhexidine preserves dentin bond in vitro.

M R O Carrilho1, R M Carvalho, M F de Goes

  • 1Department of Restorative Dentistry, Dental Materials, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil.

Journal of Dental Research
|December 26, 2006
PubMed
Summary

Chlorhexidine application after etching helps preserve resin-dentin bonds. This dental material application significantly reduces hybrid layer degradation over six months, improving bond durability.

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Area of Science:

  • Dental Materials Science
  • Adhesive Dentistry
  • Biomaterials

Background:

  • The hybrid layer is crucial for resin-dentin bond stability.
  • Matrix metalloproteinases (MMPs) contribute to hybrid layer degradation.
  • Chlorhexidine is known to inhibit MMP activity.

Purpose of the Study:

  • To investigate the effect of chlorhexidine on the long-term stability of resin-dentin bonds.
  • To determine if chlorhexidine can decelerate hybrid layer degradation.

Main Methods:

  • Class I preparations in extracted third molars were restored using an etch-and-rinse adhesive.
  • One group received 2% chlorhexidine application after etching, before adhesive application.
  • Specimens were stored in artificial saliva for 6 months; microtensile bond strength and SEM failure analysis were performed.

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Main Results:

  • Chlorhexidine treatment significantly preserved bond strength after 6 months compared to controls.
  • Protease inhibitors in the storage medium did not affect bond strength.
  • SEM analysis revealed significantly less hybrid layer failure in the chlorhexidine-treated group.

Conclusions:

  • Chlorhexidine application appears to be a beneficial adjunct for maintaining long-term resin-dentin bond integrity.
  • The findings suggest chlorhexidine's MMP-inhibiting properties contribute to bond preservation.
  • Further clinical studies are warranted to confirm these in vitro findings.