Laser inactivation of periodontal bacteria using photosensitizing dyes

Paul S. Golding; L. Maddocks; Terence A. King; D. B. Drucker

doi:10.1117/12.260669

3 December 1996 Laser inactivation of periodontal bacteria using photosensitizing dyes

Paul S. Golding, L. Maddocks, Terence A. King, D. B. Drucker

Proceedings Volume 2922, Laser Applications in Medicine and Dentistry; (1996) https://doi.org/10.1117/12.260669
Event: BiOS Europe '96, 1996, Vienna, Austria

Abstract

We demonstrate the killing of the oral bacteria Prevotella nigrescens using a photosensitizer and light from a 10 Hz, frequency doubled, Q-switched Nd:YAG pumped dye laser, with modified oscillator to increase output power. This system produced light at wavelengths close to 620 nm, the absorption maximum of the photosensitizing agent, malachite green isothiocyanate, a wavelength that is not significantly absorbed by tissue. A bacterial reduction of 97.5 percent was achieved at an energy density of 0.67 J/cm² and exposure times of 300 seconds.

Citation Download Citation

Paul S. Golding, L. Maddocks, Terence A. King, and D. B. Drucker "Laser inactivation of periodontal bacteria using photosensitizing dyes", Proc. SPIE 2922, Laser Applications in Medicine and Dentistry, (3 December 1996); https://doi.org/10.1117/12.260669

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