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Interactions between impression materials and immediate dentin sealing.

Pascal Magne1, Brik Nielsen

  • 1University of Southern California School of Dentistry, Oral Health Center, Los Angeles, CA 90089, USA. magne@usc.edu

The Journal of Prosthetic Dentistry
|October 27, 2009
PubMed
Summary
This summary is machine-generated.

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Immediate dentin sealing (IDS) requires air blocking and pumicing for ideal impressions with Extrude material. Impregum is not recommended with IDS due to frequent material interactions and faulty impressions.

Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Impression Techniques

Background:

  • Immediate dentin sealing (IDS) is a technique involving resin bonding to freshly cut dentin before impressions.
  • Potential interactions between resin coatings and impression materials are a concern.

Purpose of the Study:

  • To investigate interactions between two impression materials and resin-coated dentin surfaces.
  • To evaluate the effect of two different dentin bonding agents on these interactions.

Main Methods:

  • Six extracted molars with preparations were subjected to four procedures: control, IDS, IDS with air blocking (IDS/AB), and IDS/AB with pumicing (IDS/AB-P).
  • Impressions were made using Impregum Soft or Extrude, and optical microscopy assessed unpolymerized resin and impression material on bonded surfaces.

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Main Results:

  • IDS alone resulted in 100% faulty impressions due to unpolymerized resin (oxygen-inhibited layer).
  • Air blocking reduced but did not eliminate the oxygen-inhibited layer. Only Clearfil SE Bond with Extrude yielded ideal impressions in the IDS/AB group.
  • IDS/AB-P produced ideal Extrude impressions but over 50% faulty Impregum impressions (adhesions).

Conclusions:

  • Immediate dentin sealing protocols require air blocking and pumicing for optimal impressions with Extrude.
  • Impregum Soft is not recommended for use with immediate dentin sealing due to material incompatibilities.