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Related Experiment Videos

Surface properties of elastomeric impression materials

N Vassilakos1, C P Fernandes

  • 1Department of Prosthetic Dentistry, Lund University, Malmö, Sweden.

Journal of Dentistry
|October 1, 1993
PubMed
Summary
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New hydrophilic addition silicones improve wettability and gypsum castability in dental impressions. These advanced materials offer better performance compared to conventional silicones, reducing voids for more accurate dental models.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Surface Chemistry

Background:

  • Accurate dental impressions are crucial for fabricating prosthetics and restorations.
  • Elastomeric impression materials are widely used, but their interaction with saliva and gypsum can affect cast quality.
  • Conventional silicones often exhibit poor wettability due to salivary biofilms, leading to casting defects.

Purpose of the Study:

  • To evaluate the wettability and gypsum castability of various elastomeric impression materials after saliva exposure.
  • To compare the performance of conventional silicones, hydrophilic addition silicones, and polyether materials.
  • To identify materials that minimize voids and improve the accuracy of gypsum casts.

Main Methods:

  • Contact angle measurements of a CaSO4 solution on impression material surfaces exposed to saliva.

Related Experiment Videos

  • Gypsum castability assessment by counting voids in die stone casts from critical die impressions.
  • Simulation of clinical conditions using saliva exposure to mimic salivary biofilm acquisition.

    • Main Results:

    • Condensation silicones and conventional addition silicones showed high contact angles and numerous voids.
    • 'Hydrophilic' addition silicones demonstrated superior wettability compared to conventional types.
    • The gypsum castability of hydrophilic addition silicones was comparable to polyether materials, with fewer voids.

    Conclusions:

    • Saliva significantly impacts the wettability and gypsum castability of elastomeric impression materials.
    • Hydrophilic addition silicones represent an advancement, offering improved wettability and gypsum accuracy.
    • These findings guide the selection of impression materials for enhanced clinical outcomes in prosthodontics.