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A study of physical light screening agents.

T M Macleod, W Frain-Bell

    The British Journal of Dermatology
    |February 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Titanium dioxide offers effective physical light screening for photodermatoses with action spectra above 320 nm. This agent provides broad-spectrum protection and good cosmetic acceptability in various formulations.

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    Area of Science:

    • Dermatology
    • Photobiology
    • Materials Science

    Background:

    • Photodermatoses often involve action spectra beyond short ultraviolet (UV) wavelengths (>320 nm).
    • Chemical light screening agents are less effective against long UV radiation.
    • Physical light screening agents are necessary for photodermatoses with extended action spectra.

    Purpose of the Study:

    • To evaluate the efficacy of titanium dioxide as a physical light screening agent.
    • To assess titanium dioxide's effectiveness across different wavelength ranges.
    • To determine the cosmetic acceptability of titanium dioxide formulations.

    Main Methods:

    • In vitro techniques were employed to study titanium dioxide in various formulations.
    • Effectiveness was tested across the 400-700 nm wavelength range.

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  • Protective capacity was assessed for action spectra peaking at 365 nm and 400 nm.

    • Main Results:

    • Titanium dioxide demonstrated effectiveness throughout the 400-700 nm wavelengths.
    • Satisfactory protection was observed for photodermatoses with action spectra peaking at 365 nm and 400 nm.
    • Cosmetic acceptability was reasonable with the addition of appropriate coloring agents.

    Conclusions:

    • Titanium dioxide is a viable physical light screening agent for photodermatoses with long UV action spectra.
    • Its broad-spectrum efficacy and acceptable cosmetic profile make it suitable for patient use.
    • Formulation adjustments, including coloring agents, can enhance patient compliance.