The objective of this laboratory study was to test whether irradiation with a new 9.3µm microsecond short-pulsed CO2-laser enhances enamel caries resistance with and without additional fluoride applications. 101 human enamel samples were divided into 7 groups. Each group was treated with different laser parameters (Carbon-dioxide laser, wavelength 9.3µm, 43Hz pulse-repetition rate, pulse duration between 3μs to 7μs (1.5mJ/pulse to 2.9mJ/pulse). Using a pH-cycling model and cross-sectional microhardness testing determined the mean relative mineral loss delta Z (∆Z) for each group. The pH-cycling was performed with or without additional fluoride. The CO2 9.3μm short-pulsed laser energy rendered enamel caries resistant with and without additional fluoride use.
Peter Rechmann, Beate M.T. Rechmann, William H. Groves, Charles Le, Marcia L. Rapozo-Hilo, and John D. B. Featherstone, "Enhancing caries resistance with a short-pulsed CO2 9.3 μm laser: a laboratory study (Conference Presentation)," Proc. SPIE 9692, Lasers in Dentistry XXII, 969207 (Presented at SPIE BiOS: February 14, 2016; Published: 28 April 2016); https://doi.org/10.1117/12.2224641.4848636539001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon