Affiliation: | aDepartment of Periodontology, Matsumoto Dental College, Nagano 399-07, Japan;bLaboratory of Oral Structure and Function, Institute for Dental Science, Matsumoto Dental College, Nagano 399-07, Japan;cOffice of Technology Deuelopment, NIDDK, NIH, Bethesda, MD 20892, USA;dDepartment of Oral and Maxillofacial Surgery I, Matsumoto Dental College, Nagano 399-07, Japan;eDepartment of Anatomv, School of Medicine, Fujita Health University, Aichi 470-11, Japan |