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Related Experiment Videos

Compositional, structural, and phase changes in in vitro laser-irradiated human tooth enamel.

S Kuroda, B O Fowler

    Calcified Tissue International
    |July 1, 1984
    PubMed
    Summary

    Laser irradiation of tooth enamel alters its apatite structure, reducing demineralization. This study identified specific structural changes in high-temperature regions using X-ray diffraction and infrared spectroscopy.

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    Area of Science:

    • Biomaterials science
    • Dental research
    • Laser-matter interaction

    Background:

    • Tooth enamel's resistance to demineralization is crucial for oral health.
    • Previous studies indicate laser irradiation can reduce enamel demineralization rates.
    • Understanding laser-induced changes is key to the dissolution rate reduction mechanism.

    Purpose of the Study:

    • To identify laser-induced structural modifications in tooth enamel.
    • To investigate changes occurring in high-temperature regions of laser-irradiated enamel.
    • To correlate structural changes with reduced demineralization rates.

    Main Methods:

    • Utilized X-ray diffraction (XRD) and infrared spectroscopy (IR).
    • Analyzed extracted human teeth subjected to high energy density (10,000 J/cm2) 10.6-micron carbon dioxide laser.

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  • Focused on high-temperature regions of laser interaction.

    • Main Results:

    • Laser irradiance melted enamel apatite, forming a solidified melt.
    • The melt consisted of minor phases (alpha-tricalcium phosphate, tetracalcium phosphate) and a major phase of modified apatite.
    • Modified apatite showed reduced water, protein, carbonate, and chloride content, with possible oxide incorporation and uptake of CO2/cyanate.

    Conclusions:

    • Carbon dioxide laser irradiation significantly alters tooth enamel's apatite structure.
    • Identified structural modifications, including oxide formation, correlate with reduced demineralization.
    • The findings provide insight into the mechanism of laser-induced reduction in enamel dissolution rates.