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Related Experiment Videos

Elastomeric impression materials: effect of bulk on accuracy.

W B Eames, J C Sieweke, S W Wallace

    The Journal of Prosthetic Dentistry
    |March 1, 1979
    PubMed
    Summary
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    A 2 mm space in impression trays yielded the most accurate elastomeric impressions for dental crowns. Most materials met American Dental Association standards, indicating good clinical stability and minimal dimensional change.

    Area of Science:

    • Dental Materials Science
    • Prosthodontics
    • Biomaterials

    Background:

    • Accurate dental impressions are crucial for fabricating well-fitting prostheses, particularly full crowns.
    • Elastomeric impression materials are widely used due to their elastic recovery and accuracy.
    • Understanding the influence of impression tray design on material performance is essential for clinical success.

    Purpose of the Study:

    • To evaluate the dimensional stability and accuracy of nine elastomeric impression materials.
    • To determine the optimal interface space in impression trays for full crown preparations.
    • To assess material compliance with American Dental Association (ADA) specifications.

    Main Methods:

    • Fabrication of impression trays with 2, 4, and 6 mm interface spaces.

    Related Experiment Videos

  • Testing nine elastomeric impression materials on a simulated full crown preparation steel die.
  • Evaluating impression accuracy and dimensional changes.
  • Conducting clinical-type tests using castings poured from the impressions.

    • Main Results:

    • An interface space of 2 mm resulted in the most accurate impressions across all tested materials.
    • Eight out of nine elastomeric impression materials met the revised ADA specifications.
    • Clinical-type tests confirmed that materials with minimal dimensional change performed acceptably.

    Conclusions:

    • A 2 mm interface space in impression trays is recommended for optimal accuracy with elastomeric impression materials for full crown preparations.
    • Most tested elastomeric materials demonstrate acceptable accuracy and dimensional stability for clinical use.
    • Material selection and impression technique significantly impact the precision of dental restorations.