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							*Masahiro Kaketani
														
									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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							Kotoyo Enomoto
														
									Department of Crown and Bridge Prosthodontics, Nihon University School of Dentistry
							 
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							Taishi Kojima
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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							Youichi Ishikawa
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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							Kiyomi Miyazaki
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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							Yasumasa Fukase
														
									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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							Minoru Nishiyama
														
									Department of Dental Materials, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry