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8 November 2010 Minimal invasive treatment using 6.02 micrometer DFG laser for carious dentin
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Conventional laser light sources for the treatment of a hard tissue in dental are good for removal of caries. However these lasers cannot achieve to give a selective treatment effect for caries without a side effect for normal tissue. The objective of this study is to develop the minimal invasive treatment technique of carious dentin by selective absorption effect using the laser with a wavelength of 6.02 μm which corresponds to an absorption peak of organic matters called amide 1 band. Mid-infrared nanosecond pulsed laser by difference-frequency generation was used for the experiment of selective treatment. A tunable wavelength range, pulse width and repetition rate is from 5.5 to 10 μm, 5 ns and 10 Hz, respectively. The laser with a wavelength of 6.02 μm and predetermined energy parameters was irradiated to a carious dentin model. After laser irradiation, the surface and cross-sectional surface of samples were observed. Average power density about 15 W/cm2 realized to excavate a demineralized region selectively. In the same energy condition, serious side effect was not observed on the surface of normal dentin. A wavelength of 6.02 μm realizes a selective excavation of carious dentin. Using 6.02 μm is a novel and promising technique toward to next-generation dental treatment procedure for realizing minimal intervention.
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Kunio Awazu, Katsunori Ishii, Masayuki Saiki, Kenzo Yasuo, Kazuyo Yamamoto, and Kazushi Yoshikawa "Minimal invasive treatment using 6.02 micrometer DFG laser for carious dentin", Proc. SPIE 7845, Optics in Health Care and Biomedical Optics IV, 78452V (8 November 2010);

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