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Factors affecting the accuracy of elastometric impression materials.

S Y Chen1, W M Liang, F N Chen

  • 1School of Dentistry, China Medical University, 91 Hsueh-Shih Road, Taichung, Taiwan, ROC. saychen@mail.cmu.edu.tw <saychen@mail.cmu.edu.tw>

Journal of Dentistry
|October 13, 2004
PubMed
Summary

Addition type silicone impression materials like Aquasil and Exaflex demonstrate superior accuracy and stability. Alginate impression materials show decreased stability with increased storage time, while higher filler content improves dimensional accuracy.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Clinical Dentistry

Background:

  • Accurate dental impressions are crucial for fabricating prosthetics and restorations.
  • Elastomeric impression materials are widely used due to their flexibility and detail reproduction.
  • Understanding material properties, storage effects, and filler content is vital for optimal clinical outcomes.

Purpose of the Study:

  • To evaluate the dimensional accuracy and stability of various elastomeric impression materials.
  • To investigate the influence of storage time on impression accuracy.
  • To assess the impact of inorganic filler proportion on material performance.

Main Methods:

  • Ten impression materials were tested: three alginates and seven silicones (five commercial, two experimental).

Related Experiment Videos

  • Impressions were made from metal dies, and stone casts were poured immediately (alginate) or after 30 minutes (silicone).
  • Dimensional accuracy was measured using digital photography and a specialized measurement system, analyzed with ANOVA.

    • Main Results:

    • A significant interaction between material type and storage time affected impression accuracy.
    • Addition type silicone materials (Aquasil, Exaflex) exhibited the highest accuracy and stability.
    • Alginate materials (CAVEX, Jeltrate) showed decreased stability over time, and lower filler content correlated with greater dimensional discrepancy.

    Conclusions:

    • Impression material accuracy varies significantly, with addition silicones generally outperforming others.
    • Storage time negatively impacts the dimensional stability of alginate impression materials.
    • Higher inorganic filler content in silicone materials leads to improved dimensional accuracy and stability.