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Hiroyasu Koizumi
Department of Dental Materials, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
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Hideyuki Imai
Dental Technician School, Nihon University School of Dentistry
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Yasuhiko Kawai
Department of Removable Prosthodontics, Nihon University School of Dentistry at Matsudo