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An improved dental casting investment

W Finger, K D Jørgensen

    Scandinavian Journal of Dental Research
    |June 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A new gypsum-bonded investment material offers minimal setting expansion and 1.7% thermal expansion. This innovation, used without a casting ring, improves the fit of gold dental restorations.

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    Area of Science:

    • Dental materials science
    • Casting technology

    Background:

    • Traditional casting techniques often face challenges with dimensional accuracy due to material expansion.
    • Achieving a precise fit for dental prosthetics is crucial for clinical success and patient comfort.

    Purpose of the Study:

    • To introduce a novel gypsum-bonded investment material with controlled expansion properties.
    • To evaluate the efficacy of this investment in producing well-fitting gold inlays and crowns.

    Main Methods:

    • Development of a gypsum-bonded investment with negligible setting expansion.
    • Testing thermal expansion characteristics, achieving 1.7% expansion.
    • Utilizing the investment without a steel casting ring.
    • Integration with a previously established die-spacing technique.

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    Main Results:

    • The new investment exhibits minimal setting expansion.
    • A thermal expansion of 1.7% was recorded.
    • The material, when used without a casting ring and with the die-spacing technique, consistently produced gold restorations with a suitable loose-fit.
    • This facilitated easier placement on dental preparations.

    Conclusions:

    • The presented gypsum-bonded investment offers a significant advancement in dental casting.
    • Its controlled expansion properties and compatibility with specific techniques enhance the precision and fit of gold prosthetics.
    • This material provides a viable alternative for producing accurate and well-fitting dental restorations.