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Dentine Surface Morphology after Chlorhexidine Application-SEM Study.

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Applying 0.2% chlorhexidine digluconate (CHG) for 15 seconds, then draining, effectively cleans dentine surfaces. This protocol removes the smear layer and leaves beneficial CHG deposits, influencing bond strength.

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Area of Science:

  • Dental Materials Science
  • Biomaterials
  • Surface Chemistry

Background:

  • Chlorhexidine (CHX) is a common antibacterial agent reducing cariogenic bacteria.
  • CHX application on dentine may affect adhesive bond strength.
  • Understanding CHG's effect on dentine surfaces is crucial for dental applications.

Purpose of the Study:

  • To evaluate dentine surface characteristics after various chlorhexidine digluconate (CHG) application protocols.
  • To determine the impact of CHG concentration, application time, and rinsing methods on dentine.
  • To assess smear layer removal and CHG deposition on dentine surfaces.

Main Methods:

  • Dentine surfaces were treated with 0.2% or 2.0% CHG for 15 or 30 seconds.
  • Treatments were applied to both etched and unetched dentine surfaces.
  • Surfaces were either water rinsed or drained post-application.
  • Scanning electron microscopy (SEM) and energy-dispersive spectrometer (EDS) analyses were performed.

Main Results:

  • The 0.2% CHG concentration applied for 15 seconds, followed by draining, effectively removed the smear layer.
  • This specific protocol resulted in dentine surfaces enriched with CHG deposits.
  • Both CHG concentration and application duration influenced smear layer removal and CHG deposition.

Conclusions:

  • The protocol of applying 0.2% CHG for 15 seconds and draining is effective for smear layer removal.
  • CHG concentration and application time are key factors determining surface modification.
  • Optimized CHG protocols can enhance dentine surface preparation for dental procedures.