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Structural changes in composite surface material after dry polishing.

C L Davidson, P P Duysters, C De Lange

    Journal of Oral Rehabilitation
    |September 1, 1981
    PubMed
    Summary
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    Heating composite materials during dry polishing increases their hardness and abrasion resistance. Thermal analysis revealed distinct reactions around 70°C and above 100°C, linked to further curing and glass transition, respectively.

    Area of Science:

    • Materials Science
    • Polymer Chemistry

    Background:

    • Dry polishing of composite materials can expose them to elevated temperatures.
    • Understanding material property changes under thermal stress is crucial for optimizing manufacturing processes.

    Purpose of the Study:

    • To investigate the thermal properties of composite materials subjected to temperatures relevant to dry polishing.
    • To correlate bulk material behavior with properties observed on dry-polished surfaces.

    Main Methods:

    • Thermal analysis (Differential Scanning Calorimetry) from room temperature (R.T.) to 200°C.
    • Microscopic observation of glass transition.
    • Hardness and abrasion resistance measurements at various temperatures during heating and cooling.

    Main Results:

    Related Experiment Videos

    • Two thermal reaction stages identified: one at ~70°C (further curing) and another above 100°C (glass transition).
    • Glass transition was microscopically confirmed.
    • Hardness and abrasion resistance increased with rising temperature, demonstrating improved material performance.

    Conclusions:

    • Elevated temperatures during dry polishing can induce beneficial changes in composite material properties.
    • The observed thermal reactions and property enhancements in bulk material are relevant to dry-polished surfaces.