West, John David2019-10-222019-10-221975197516017300b14337915https://hdl.handle.net/2144/38360PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please log in with a valid BU account to access and click Download. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, 1975. Endodontics.Bibliography included.A collection of ninety-five endodontic failures was evaluated with emphasis on the status of the three-dimensional endodontic seal. The investigative methods included data derived from clinical, microscopic, radiographic, photomacrographic and transparent post-Pelikan ink infusion information. While a number of statistical inferences were derived from the results of this investigation, the clinically significant observations were that every failure demonstrated at least one underfilled portal of exit and that no overfill failures were recorded.en-USThis work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Root canal therapyThesis/Dissertation