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Related Experiment Videos

Tear strength of elastomeric impression materials.

T W Herfort, W W Gerberich, C W Macosko

    The Journal of Prosthetic Dentistry
    |January 1, 1978
    PubMed
    Summary
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    Polysulfide dental materials exhibit superior tear strength compared to silicones and polyethers. However, the clinical relevance of these tear strength differences remains unclear without considering other factors like adhesion.

    Area of Science:

    • Materials Science
    • Biomaterials Engineering
    • Dental Materials Research

    Background:

    • Dental materials require robust mechanical properties, including tear strength, for clinical success.
    • Understanding the comparative tear resistance of different polymer classes is crucial for material selection.
    • Previous research has not fully elucidated the tear strength hierarchy among polysulfide, silicone, and polyether elastomers.

    Purpose of the Study:

    • To quantify and compare the maximum tear strength of polysulfide, silicone, and polyether dental materials.
    • To determine the time course of tear strength development under simulated clinical conditions.

    Main Methods:

    • Simulated clinical conditions were used to test the tear strength of various dental materials.
    • Tear strength measurements were recorded over a 10 to 15-minute period.

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  • Comparative analysis was performed between polysulfide, silicone, and polyether material groups.

    • Main Results:

    • Maximum tear strength for all tested materials was achieved within 10 to 15 minutes.
    • Polysulfide materials demonstrated significantly higher tear strength, being three to six times greater than silicones.
    • Polyether materials showed tear resistance superior to silicones but considerably lower than polysulfides (one-third to one-fifth).

    Conclusions:

    • Polysulfide elastomers possess superior tear strength compared to silicone and polyether materials.
    • The clinical implications of these tear strength variations are not fully understood.
    • Further research is needed to evaluate other critical factors, such as adhesion, to determine overall clinical significance.