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Related Experiment Videos

[Accuracy of post impressions using metal models].

M Yoda

    Nihon Hotetsu Shika Gakkai Zasshi
    |February 1, 1989
    PubMed
    Summary

    Impression material accuracy depends on post shape and storage. Silicones offer the best dimensional stability, but new materials are needed for optimal results without deformation.

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    Mechanics research communications·2012

    Area of Science:

    • Dental Materials Science
    • Biomaterials Engineering

    Background:

    • Accurate dental impressions are crucial for prosthodontic restorations.
    • Understanding the dimensional stability of impression materials is essential for clinical success.

    Purpose of the Study:

    • To evaluate the impact of post shape, storage duration, and conditions on the accuracy of elastic dental impression materials.
    • To compare the deformation characteristics of various impression materials under different post-removal scenarios.

    Main Methods:

    • Testing multiple elastic impression materials (alginate, polysulfide, agar-agar, polyether, silicone) using a metal model with five distinct post shapes.
    • Assessing dimensional accuracy and shape fidelity after removal and during storage under varying conditions (horizontal placement).

    Main Results:

    • Alginate, regular polysulfide, and agar-agar exhibited significant deformation, especially with undercuts.
    • Injection-type polysulfide and polyether showed minor deformation, while silicones (condensation and addition) demonstrated minimal deformation across all post shapes.
    • All impression materials showed some degree of dimensional decrease over time, with alginate and polysulfide showing increased deformation when stored horizontally.

    Conclusions:

    • Material selection significantly influences impression accuracy and post-removal stability.
    • Silicone impression materials offer superior dimensional stability compared to alginate and polysulfide.
    • Current impression materials do not fully meet the ideal requirements for dimensional stability and lack of deformation, highlighting the need for novel material development.

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