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Related Experiment Videos

[Curing ability of polymerization lights for composite materials].

P R Hotz, S B Peter, H Thomann

    Schweizer Monatsschrift Fur Zahnmedizin = Revue Mensuelle Suisse D'Odonto-Stomatologie = Rivista Mensile Svizzera Di Odontologia E Stomatologia
    |January 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

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    Dental light curing devices degrade over time, leading to insufficient polymerization depth. Newer devices and those with rigid light guides perform better, highlighting the need for regular maintenance and replacement of dental curing equipment.

    Area of Science:

    • Dental Materials Science
    • Biomaterials Engineering

    Context:

    • Evaluation of in-vivo performance of dental light curing devices.
    • Comparison of 38 in-service units from four brands against new light sources.

    Purpose:

    • To assess the curing efficacy and depth of polymerization of dental light activators.
    • To identify factors affecting polymerization performance in clinical settings.

    Summary:

    • Knoop microhardness measurements revealed insufficient polymerization below 2 mm depth, even with 60s exposure.
    • Older light sources exhibited poorer curing properties than new ones.
    • Rigid glass fiber light guides generally outperformed flexible fiber-optic cables.

    Impact:

    • Highlights the degradation of light curing units over time and its impact on composite restoration quality.

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  • Identifies specific failure modes, including light guide contamination, cooling defects, and voltage drops.
  • Suggests implications for dental practice regarding equipment maintenance and replacement schedules for optimal clinical outcomes.