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Related Experiment Videos

Microleakage in the sandwich technique.

G J Mount, A Papageorgiou, O F Makinson

    American Journal of Dentistry
    |August 1, 1992
    PubMed
    Summary

    This study evaluated microleakage in "sandwich" restorations using glass ionomer lining cement and resin composite. Results showed minimal leakage, primarily linked to resin composite shrinkage.

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    Area of Science:

    • Dental Materials Science
    • Restorative Dentistry
    • Biomaterials

    Background:

    • The "sandwich" technique, utilizing glass ionomer lining cement with resin composite, aims to replicate clinical success in vitro.
    • Optimizing this technique involves evaluating material ratios and placement strategies for modern dental materials.

    Purpose of the Study:

    • To assess microleakage in simulated Class V erosion lesions restored with the "sandwich" technique.
    • To evaluate the reproducibility of clinical success in an in vitro setting.
    • To compare a traditional Type III glass ionomer with a dual-cure glass ionomer in this technique.

    Main Methods:

    • Class V erosion lesions were prepared in extracted human molar teeth.
    • Restorations were performed using either Type III glass ionomer (high powder:liquid ratio) or dual-cure glass ionomer, both with overlying resin composite.
    • Restorations underwent water storage, thermal cycling, and dye immersion to evaluate microleakage.

    Main Results:

    • Minimal microleakage was observed compared to other published studies.
    • The primary source of leakage identified was the setting shrinkage of the resin composite material.
    • Both tested glass ionomer lining cements demonstrated low microleakage potential within the "sandwich" restoration.

    Conclusions:

    • The "sandwich" restoration technique, particularly with modern dual-cure glass ionomers, shows promising results in minimizing microleakage.
    • Resin composite setting shrinkage remains a critical factor influencing the marginal integrity of these restorations.
    • This in vitro model effectively simulates and assesses microleakage in "sandwich" restorations.

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