23 March 2005 Increasing pulse number during CO2 laser irradiation of dental enamel extends acid dissolution time
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Abstract
Several prior studies have shown that pretreatment of dental enamel by specific carbon dioxide laser conditions inhibited subsequent acid dissolution of the outer several μm of dental enamel. An initial low dissolution rate was followed by a return to the non-irradiated control dissolution rate from deeper regions. The aim of the present study was to examine the dissolution profiles following irradiation using 60 pulses per spot rather than the previously used 10 or 25. Bovine enamel blocks were irradiated at a wavelength of 9.6 μm at either 20 or 60 pulses per spot with a 20 μs pulse duration carbon dioxide laser using overlapping spots, and a fluence of 1.0 J/cm2. Dissolution profiles were measured in acetate buffer, versus non-irradiated controls. The higher number of pulses per spot produced a similar initial low dissolution rate, but the effect was deeper than with 20 pulses per spot. Supported by NIH/NIDCR grant DE 09958.
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John D. B. Featherstone, Charles Q. Le, Daniel Fried, "Increasing pulse number during CO2 laser irradiation of dental enamel extends acid dissolution time", Proc. SPIE 5687, Lasers in Dentistry XI, (23 March 2005); doi: 10.1117/12.604550; https://doi.org/10.1117/12.604550
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