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Related Experiment Videos

[Crack path in dental amalgams].

S Oualint, P Lagouvardos, G Vougiouklakis

    Odontostomatologike Proodos
    |December 1, 1990
    PubMed
    Summary
    This summary is machine-generated.

    Microcracks in dental amalgam restorations can lead to secondary decay. This study reveals voids and gamma 2-phase promote cracks, while alloy particles and specific phases resist fracture, improving amalgam durability.

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    Area of Science:

    • Dental Materials Science
    • Materials Engineering
    • Biomaterials

    Context:

    • Dental amalgam restorations are susceptible to marginal microcracks.
    • These microcracks allow bacterial ingress, leading to secondary caries and pulpal inflammation.
    • Understanding amalgam fracture toughness is crucial for durable dental restorations.

    Purpose:

    • To evaluate microcracks on the surface of different dental amalgams.
    • To correlate microcrack formation with the microstructural phases of the amalgam.
    • To identify microstructural elements that influence amalgam fracture resistance.

    Summary:

    • Seven amalgams, including commercial and experimental formulations, were tested using a Vickers hardness tester to observe surface microcracks.
    • Microstructural analysis revealed that voids and the gamma 2-phase primarily facilitate crack formation and propagation.

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  • Alloy particles (gamma-phase), eutectic spheres (in admixed high copper amalgams), and eta'-phase crystals (in single melt high copper amalgams) were identified as fracture-resisting elements.

    • Impact:

    • Provides insights into the microstructural factors governing dental amalgam fracture toughness.
    • Identifies specific phases and structural features that enhance or impede crack propagation.
    • Informs the development of improved dental amalgam formulations with superior mechanical properties and longevity.