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Unpolymerized surface layers on sealants

I E Ruyter

    Acta Odontologica Scandinavica
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Oxygen inhibits dental resin polymerization, creating an unpolymerized surface layer. Thinner layers result from specific activators, higher viscosity, UV curing, and acetone-based chemical activation.

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    Area of Science:

    • Polymer Chemistry
    • Dental Materials Science
    • Biomaterials Engineering

    Background:

    • Oxygen inhibition is a known phenomenon in radical polymerization, affecting surface properties.
    • Dental resins require complete polymerization for optimal mechanical and biological performance.
    • An unpolymerized surface layer can compromise the integrity and longevity of dental restorations.

    Purpose of the Study:

    • To quantify the thickness of the unpolymerized surface layer in various dental polymers.
    • To investigate the influence of different activators, resin viscosity, and curing methods on this layer.
    • To identify resin compositions and initiating systems that minimize oxygen inhibition.

    Main Methods:

    • Microscopic techniques were employed to measure the inhibition depth of unpolymerized surface layers.

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  • Several proprietary dental resin systems were analyzed.
  • Variations in resin composition, including activators (e.g., 3,4-xylyl-diethanolamine vs. p-tolyldiethanolamine), viscosity, and initiator systems (UV-light vs. peroxide-amine vs. chemical activation with acetone) were systematically evaluated.

    • Main Results:

    • The inhibition depth varied significantly, ranging from 7 to 84 micrometers across different dental resins.
    • Resins utilizing 3,4-xylyl-diethanolamine as an activator exhibited thinner unpolymerized layers compared to those with p-tolyldiethanolamine.
    • Higher resin viscosity correlated with a reduced thickness of the unpolymerized film.
    • UV-light cured resins showed thinner inhibited layers than comparable peroxide-amine initiated systems.
    • The thinnest unpolymerized film was observed in a chemically activated resin system containing acetone.

    Conclusions:

    • The thickness of the unpolymerized surface layer in cured dental resins is demonstrably influenced by the specific chemical composition and the chosen initiating system.
    • Optimizing activator choice, managing resin viscosity, and selecting appropriate curing methods (e.g., UV-light or specific chemical activation) can effectively minimize oxygen inhibition.
    • Understanding these factors is crucial for developing dental polymers with improved surface properties and enhanced clinical performance.