Said, Yousri Z.2018-07-102018-07-1019761976https://hdl.handle.net/2144/29798Thesis (D.Sc.D.)-- - Boston University School of Graduate Dentistry, 1976 (Periodontology).Bibliography included.en-USThis work is being made available in OpenBU by permission of its author, and is available for research purposes only. All rights are reserved to the author.Root surfacesThesis/Dissertation