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Hardness tests in highly filled composite resins.

K H Chung

    Zhonghua Ya Yi Xue Hui Za Zhi
    |March 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    This study compared three hardness testers for light-cured posterior composite resins. Knoop hardness testing is best for measuring the superficial hardness of these dental materials.

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    Area of Science:

    • Materials Science
    • Biomaterials Science
    • Dental Materials

    Background:

    • Dental composites are widely used for posterior restorations.
    • Accurate hardness measurement is crucial for evaluating composite performance and durability.
    • Existing hardness testing methods may yield varying results for composite resins.

    Purpose of the Study:

    • To evaluate and compare the hardness of seven proprietary light-cured posterior composite resins.
    • To determine the most suitable hardness testing method for these materials.

    Main Methods:

    • Seven proprietary light-cured posterior composite resins were tested.
    • Hardness was measured using three different testers: Knoop hardness tester, Barcol indenter, and Rockwell 15T hardness meter.
    • Specimens were tested after light-curing and 24-hour water immersion at 37°C.

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    Main Results:

    • Barcol hardness numbers ranged from 79.2 to 85.0.
    • Rockwell 15T hardness data ranged from 73.3 to 80.3.
    • Knoop hardness numbers varied significantly from 39.9 to 79.0.
    • Barcol and Rockwell 15T showed smaller variations and reflect bulk hardness.
    • Knoop hardness testing demonstrated greater variability but is suitable for superficial hardness.

    Conclusions:

    • Barcol and Rockwell 15T hardness tests provide consistent bulk hardness measurements for posterior composite resins.
    • Knoop hardness testing is a feasible method for assessing the superficial hardness of highly filled composite resins.