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Related Experiment Videos

Recording surface detail on moist surfaces with elastomeric impression materials.

J F McCabe1, T E Carrick

  • 1Dental School, University of Newcastle upon Tyne. j.f.mccabe@ncl.ac.uk

The European Journal of Prosthodontics and Restorative Dentistry
|April 8, 2006
PubMed
Summary

Polyether and hybrid elastomeric impression materials show superior accuracy on moist surfaces compared to polyvinylsiloxane. Their hydrophilic nature improves detail reproduction, especially in deep grooves.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Accurate dental impressions are crucial for prosthodontic restorations.
  • Moist intraoral conditions can challenge the accuracy of elastomeric impression materials.
  • Understanding material properties like hydrophilicity is key to improving impression accuracy.

Purpose of the Study:

  • To evaluate the accuracy of three different elastomeric impression materials on moist surfaces.
  • To compare the performance of polyvinylsiloxane, polyether, and hybrid materials in recording fine details.
  • To determine the influence of material composition on impression accuracy under wet conditions.

Main Methods:

  • Three elastomeric impression materials (polyvinylsiloxane, polyether, hybrid) were tested.

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  • Impressions were made of gypsum casts with shallow (20 µm) and deep (180 µm) grooves under moist conditions.
  • A non-contacting laser profilometer was used to measure groove dimensions in casts and impressions.

    • Main Results:

    • All materials accurately recorded dimensions in the x-y plane.
    • Polyether and hybrid materials demonstrated higher accuracy than polyvinylsiloxane in recording deep groove depths (z-plane).
    • The hydrophilic nature of polyether and hybrid materials correlated with improved accuracy on moist surfaces.

    Conclusions:

    • Polyether and hybrid impression materials offer superior accuracy for moist surfaces.
    • Hydrophilicity is a critical factor for enhanced detail reproduction in challenging conditions.
    • These findings are particularly relevant for impressions in areas of difficult access.