Pit Formation in Human Enamel and Dentin Irradiated using the 2.94 μm LEBRA-Free Electron Laser
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概要
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The ablation effect of laser treatment of dental tissues is mainly determined by : i) wavelength, ii) power fluence, and iii) pulse structure. To evaluate the effect of pulse structure, the 2.94 μm free electron laser (FEL) and the Er:YAG laser were used to irradiate human tooth enamel and dentin. A 2.94 μm FEL of 8-10 μsec excision with 2 Hz was generated by the 80 MeV LINAC-undulater system at LEBRA, Nihon University, with the macro-pulse structure of 20 μsec and with less than 1 pico-second micro-pulses at 350 pico-sec interval. Size and depth of the pits formed by laser irradiation were measured using a profilometer. Only a 3 mJ LEBRA-FEL was sufficient to form a crater in the enamel and dentin, and the depth of the pit formed by laser irradiation was dependent upon the power of laser. Even when the higher-powered FEL was applied, the craters showed no signs of scorching. Conversely, craters with scorching were evident when the Er : YAG laser was used on dentin. In conclusion, heat damage of dental hard tissues can be avoided using a micro-pulse structured laser.
著者
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Nemoto Kimiya
Department Of Dental Biomaterials Nihon University School Of Dentistry At Matsudo
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Okada Hiroyuki
Department Of Cardiology Musashino Red Cross Hospital
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Sakae Toshiro
Department Of Anatomy Ii Nihon University School Of Dentistry At Matsudo
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Sato Yukie
Department Of Oral Pathology Nihon University School Of Dentistry At Matsudo
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Hayakawa Toru
Department Of Biochemistry Akita University School Of Medicine
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Oinuma Hirokazu
Department of Anatomy II, Nihon University School of Dentistry at Matsudo
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Kuwada Takao
Lebra Laboratory For Electron Beam Research And Application Institute Of Quantum Science Nihon Unive
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Tanimoto Yasuhiro
Department Of Dental Biomaterials Nihon University School Of Dentistry At Matsudo
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HAYAKAWA Yasushi
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon Un
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SAKAI Takeshi
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon Un
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NOGAMI Kyoko
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon Un
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TANAKA Toshinari
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon Un
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HAYAKAWA Ken
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon Un
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SATO Isamu
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon Un
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Higa Masanori
Department Of Anatomy Ii Nihon University School Of Dentistry At Matsudo
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Kozawa Yukishige
Department Of Anatomy Ii Nihon University School Of Dentistry At Matsudo
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Mori Akira
Lebra Laboratory For Electron Beam Research And Application Institute Of Quantum Science Nihon Unive
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Yamamoto Hirotsugu
Department of Optical Science and Technology, Faculty of Engineering, The University of Tokushima, 2-1, Minamijosanjima-cho, Tokushima 770-8506, Japan
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Hayakawa Toru
Departments of Dental Biomaterials, Nihon University School of Dentistry at Matsudo
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Hayakawa Yasushi
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon University
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Tanaka Toshinari
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon University
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Higa Masanori
Departments of Histology, Cytology and Developmental Anatomy, Nihon University School of Dentistry at Matsudo
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Hayakawa Ken
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon University
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Nogami Kyoko
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon University
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Kuwada Takao
LEBRA, Laboratory for Electron Beam Research and Application, Institute of Quantum Science, Nihon University
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