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							*Taishi Kojima
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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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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							Masahiro Saitoh
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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							Terumasa Kaneda
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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							Taro Inoue
														
									Department of Dental Materials, Nihon University School of Dentistry
							 
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							Teiji Shibasaki
														
									Saiseikai Central Hospital
							 
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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