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Updated: Apr 25, 2026

Author Spotlight: Advancements in Stem Cell Regenerative Therapy Through Photobiomodulation
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Transdentinal cell photobiomodulation using different wavelengths.

A P S Turrioni, F G Basso, J R L Alonso

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    |August 20, 2014
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    Summary
    This summary is machine-generated.

    Infrared and red LED irradiation significantly enhanced odontoblast-like cell activity and collagen production. These findings suggest optimal parameters for transdentinal photobiomodulation in dental applications.

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    Area of Science:

    • Biomedical Engineering
    • Cell Biology
    • Dental Materials Science

    Background:

    • Odontoblast-like cells are crucial for dentin repair and regeneration.
    • Transdentinal irradiation is a potential therapeutic approach in dentistry.
    • Optimizing light-emitting diode (LED) parameters is key for effective photobiomodulation.

    Purpose of the Study:

    • To investigate the impact of transdentinal LED irradiation with varying parameters on odontoblast-like cells (MDPC-23).
    • To determine the optimal LED wavelengths and energy densities for stimulating cellular responses.

    Main Methods:

    • Human dentin discs were irradiated with LEDs (450, 630, 840 nm) at different energy densities (0, 4, 25 J/cm²).
    • Evaluated cell viability, alkaline phosphatase (ALP) activity, total protein synthesis (TP), and cell morphology.
    • Analyzed collagen type I (Col-I) gene expression using quantitative PCR.

    Main Results:

    • LED irradiation at 630 nm and 25 J/cm² significantly increased cell viability (21.8%).
    • Increased ALP activity was observed across most tested LED parameters, except 450 nm at 4 J/cm².
    • Infrared LED at 4 J/cm² enhanced Col-I gene expression, while higher energy densities promoted cell attachment.

    Conclusions:

    • Infrared LED irradiation (4 J/cm²) and red LED irradiation (25 J/cm²) are effective for transdentinal photobiomodulation.
    • These parameters show promise for stimulating odontoblast-like cell functions in dental regenerative therapies.