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Masking Colored Substrates Using Monolithic and Bilayer CAD-CAM Ceramic Structures.

G R Basso, A B Kodama, A H Pimentel

    Operative Dentistry
    |April 14, 2017
    PubMed
    Summary
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    Bilayer ceramic restorations offer superior shade masking compared to monolithic ones, especially over metallic backgrounds. Thinner ceramic layers enhance translucency but reduce masking ability.

    Area of Science:

    • Dental Materials Science
    • Biomaterials Engineering
    • Restorative Dentistry

    Background:

    • Computer-Aided Design/Computer-Aided Manufacturing (CAD-CAM) ceramics are widely used in dental restorations.
    • Understanding the optical properties, specifically masking ability and translucency, is crucial for aesthetic outcomes.

    Purpose of the Study:

    • To compare the masking ability and translucency of monolithic and bilayer CAD-CAM ceramic structures.
    • To evaluate the influence of ceramic thickness and background substrate on these optical properties.

    Main Methods:

    • Lithium disilicate ceramic discs (IPS e.max CAD) of varying thicknesses were tested in monolithic and bilayer (with zirconia framework) configurations.
    • Spectrophotometry was used to measure translucency parameter (TP) and masking ability (ΔE00) over different backgrounds.

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    Main Results:

    • Thinner lithium disilicate layers increased translucency but decreased masking ability.
    • Monolithic structures exhibited greater translucency and color variation than bilayer structures.
    • Bilayer structures demonstrated superior masking ability, particularly over metallic backgrounds.

    Conclusions:

    • Monolithic ceramic veneers can mask darker backgrounds (e.g., C4 shade) but are insufficient for metallic backgrounds.
    • Bilayer ceramic structures provide enhanced shade masking capabilities compared to monolithic designs, making them more suitable for challenging aesthetic situations.