Minimally invasive treatment of carious dentin with a nanosecond pulsed laser at 5.8 um wavelength

Katsunori Ishii; Masayuki Saiki; Kazushi Yoshikawa; Kenzo Yasuo; Kazuyo Yamamoto; Kunio Awazu

doi:10.1117/12.907966

16 February 2012 Minimally invasive treatment of carious dentin with a nanosecond pulsed laser at 5.8 μm wavelength

Katsunori Ishii, Masayuki Saiki, Kazushi Yoshikawa, Kenzo Yasuo, Kazuyo Yamamoto, Kunio Awazu

Proceedings Volume 8208, Lasers in Dentistry XVIII; 82080K (2012) https://doi.org/10.1117/12.907966
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

Conventional lasers, Er:YAG laser and Er,Cr:YSGG laser, lack the ability for selective excavation to discriminate carious tissue only because they use the laser tissue interaction derived from a strong absorption of water. Based on the absorption property of carious dentin, characteristic absorption bands around 6 μm are candidate for selective excavation. Our group has already observed the difference of ablation depth between demineralized and normal dentin in the wavelength range from 5.75 to 6.60 μm. Also this study has showed the effectiveness of 5.8 μm. Objective of this study is to determine optimal irradiation parameters of selective excavation by using 5.8 μm. Bovine dentin plates demineralized by soaking in lactic acid solution were used as a carious dentin model. A nanosecond pulsed laser at 5.8 μm wavelength was obtained by difference-frequency generation technique. The laser delivers 5 ns pulse width at a repetition rate of 10 Hz. After irradiation, morphological change and measurement of ablation depth was observed with a scanning electron microscope and a confocal laser microscope, respectively. In 5.8 μm wavelength, high ablation efficiency with a low thermal side effect was observed. 5.8 μm wavelength provides a selective excavation technique for minimal intervention.

Citation Download Citation

Katsunori Ishii, Masayuki Saiki, Kazushi Yoshikawa, Kenzo Yasuo, Kazuyo Yamamoto, and Kunio Awazu "Minimally invasive treatment of carious dentin with a nanosecond pulsed laser at 5.8 μm wavelength", Proc. SPIE 8208, Lasers in Dentistry XVIII, 82080K (16 February 2012); https://doi.org/10.1117/12.907966

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