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Hideo Ogura
Department of Dental Materials Science, School of Dentistry at niigata, The Nippon Dental University
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*Kiyoshi Kakuta
Department of Dental Materials Science, School of Dentistry at niigata, The Nippon Dental University
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Kazuo Ohkuma
Department of Dental Materials Science, School of Dentistry at niigata, The Nippon Dental University
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Yuuki Sakamoto
GC CORPORATION