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Reliability of the impression replica technique.

Anders Falk, Per Vult von Steyern, Håkan Fransson

    The International Journal of Prosthodontics
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    The impression replica technique shows moderate variations when assessing the fit of zirconia fixed dental prostheses (FDPs). This method is useful for evaluating marginal and internal fit in dental restorations.

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    Area of Science:

    • Dental Materials Science
    • Prosthodontics
    • Biomaterials Engineering

    Background:

    • Accurate marginal and internal fit of fixed dental prostheses (FDPs) is crucial for long-term clinical success.
    • Zirconia has become a popular material for FDPs due to its strength and aesthetics.
    • Evaluating the fit of complex restorations like four-unit zirconia FDPs requires reliable techniques.

    Purpose of the Study:

    • To assess the reliability of the impression replica technique for measuring the marginal and internal fit of a four-unit zirconia fixed dental prosthesis (FDP).
    • To quantify the variations in fit measurements obtained using this technique.

    Main Methods:

    • The impression replica technique was employed using light-body silicone material to simulate cement placement.
    • The FDP was repeatedly seated on an epoxy cast to measure marginal and internal fit at various points.
    • Variations in measurements were analyzed across different locations on the FDP.

    Main Results:

    • All measured points for marginal and internal fit exhibited variability.
    • The most significant variations were observed at the distal margin (33 μm) and the distal abutment of the FDP (77 μm).
    • The technique demonstrated moderate variations in fit measurements.

    Conclusions:

    • The impression replica technique provides a reliable, albeit with moderate variations, method for evaluating the marginal and internal fit of four-unit zirconia FDPs.
    • This technique can be a valuable tool in the quality control of dental prostheses fabrication.