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Related Experiment Videos

Relief formation in polished amalgam surfaces.

J Leitão

    Acta Odontologica Scandinavica
    |December 1, 1984
    PubMed
    Summary

    Polishing dental amalgam creates surface relief due to different phase levels. This structural relief, particularly the protruding gamma-1 phase, limits the achievable smoothness of the amalgam surface.

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    Area of Science:

    • Dental Materials Science
    • Surface Engineering
    • Microscopy

    Background:

    • Dental amalgam is a widely used restorative material.
    • Surface finish of dental restorations impacts plaque accumulation and aesthetics.
    • Understanding amalgam surface topography after polishing is crucial for clinical success.

    Purpose of the Study:

    • To investigate the surface relief of polished dental amalgams.
    • To compare the surface topography of different types of dental amalgams after polishing.
    • To identify the microstructural features contributing to amalgam surface roughness.

    Main Methods:

    • Scanning electron microscopy (SEM) was used to examine polished amalgam surfaces.
    • Metallographic polishing was performed on low-copper and high-copper amalgams.
    • Computerized analysis of traced surface profiles quantified phase levels and roughness.

    Main Results:

    • Polishing resulted in distinct surface relief in all amalgam types studied.
    • The gamma-2 phase exhibited recesses, while the gamma-1 phase protruded.
    • Surface roughness was influenced by the relative levels of different microstructural phases.

    Conclusions:

    • Well-polished dental amalgam surfaces possess inherent structural relief.
    • The protruding gamma-1 phase significantly contributes to the surface roughness.
    • Achieving a perfectly smooth amalgam surface is limited by its microstructural composition and polishing-induced relief.

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