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A modified phosphate-bonded casting investment

W Finger, K Kota

    Scandinavian Journal of Dental Research
    |June 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    A new phosphate-bonded casting investment offers precise thermal expansion to counteract alloy shrinkage, enabling consistent fit for dental restorations. This material facilitates predictable slidefit and loosefit outcomes in crown and bridge fabrication.

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    Area of Science:

    • Dental Materials Science
    • Biomaterials Engineering

    Background:

    • Dental casting alloys, particularly gold and high-precious types, exhibit significant thermal shrinkage post-casting.
    • Achieving accurate fit in porcelain fused to metal (PFM) restorations is critical for longevity and function.
    • Conventional investments may not adequately compensate for alloy shrinkage, leading to fit discrepancies.

    Purpose of the Study:

    • To describe an experimental phosphate-bonded casting investment with controlled thermal expansion.
    • To evaluate the investment's ability to compensate for the thermal shrinkage of dental casting alloys.
    • To assess the impact of the investment on the fit of cast restorations using ringless and die spacer techniques.

    Main Methods:

    • Development of a phosphate-bonded casting investment with negligible setting expansion.

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  • Characterization of the investment's thermal expansion properties (1.6%).
  • Evaluation of cast restoration fit using a ringless casting technique and a die spacer technique.

    • Main Results:

    • The experimental investment demonstrated negligible setting expansion.
    • A thermal expansion of 1.6% was achieved, effectively compensating for alloy shrinkage.
    • Consistent slidefit was obtained when using the investment with a ringless casting technique.
    • Routine production of cast restorations with a consistent and known degree of loosefit was possible in combination with a die spacer technique.

    Conclusions:

    • The described phosphate-bonded investment offers a solution for managing thermal shrinkage in dental casting.
    • Its controlled thermal expansion is suitable for conventional gold and high-precious alloys in PFM applications.
    • The investment enables predictable and consistent fit (slidefit and loosefit) of cast restorations, improving clinical outcomes.