PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (D.Sc.D.)--Boston University, Henry M. Goldman School Dental Medicine, 1997 (Oral Biology).Includes bibliographical references: (leaves 128-140).