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22 April 1998 Surface dissolution kinetics of dental hard tissue irradiated over a fluence range of 1 to 8 J/cm2
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Proceedings Volume 3248, Lasers in Dentistry IV; (1998)
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States
Previous studies have demonstrated that carbon dioxide (CO2) laser treatment of dental enamel can inhibit subsequent sub-surface caries-like progression. Irradiation of dental enamel by specific wavelengths and fluences of CO2 laser light alters the chemical composition of the crystals, decomposing the carbonate component. The present study examined the effects of fluence and number of pulses on the surface dissolution kinetics of dental enamel following laser irradiation of the surface. The initial dissolution rate of dental enamel (5 by 5 mm blocks) in pH 4.5 acetate buffer was determined after laser irradiation by a pulsed CO2 laser at 9.3 micrometer, with a pulse duration of 100 microseconds, and 0-25 pulses per spot, with fluences of 0-8 J/cm2. Maximum inhibition of dissolution occurred at fluences of 3-5 J/cm2 coinciding with maximum carbonate loss, but the beneficial effect was negated at higher fluences as the surface chemistry changed. Irradiation by more than 5 pulses produced minimal further benefit.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John D. B. Featherstone, Daniel Fried, and Clifford W. Duhn "Surface dissolution kinetics of dental hard tissue irradiated over a fluence range of 1 to 8 J/cm2", Proc. SPIE 3248, Lasers in Dentistry IV, (22 April 1998);

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