Vilkin, Barry M.2023-03-242023-03-2419841984https://hdl.handle.net/2144/45948PLEASE 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 (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1984, (Endodontics).Includes bibliography: leaves 319-323.The endodontic community is well aware that the future will produce a substantial number of retreatment cases. Practitioners who face cases requiring retreatment often choose a surgical approach, despite the lack of knowledge within the profession about the efficacy of nonsurgical remedies. A review of the literature produces a scant few articles that focus on nonsurgical retreatment techniques and success. This study was undertaken to evaluate the efficacy of non­ surgical retreatment approaches and, in particular, Schilder's cleaning, shaping and obturating techniques. Cases retreated nonsurgically in the endodontic clinic at Boston University School of Graduate Dentistry between 1975 and 1983 were recalled until a sample of 100 was obtained. The patient's records were reviewed to determine clinical symptomology and radiographic status at the- time of retreatment. Recall data was obtained from the clinical and radiographic examination given at the recall appointment. The study found a significant number (nine percent) of "lateral" rarefactions during the pretreatment radiographic evaluation. Upon recall, all of these cases exhibited complete or partial bone regeneration. In cases involving short-filled canals, the study found that nonsurgical retreatment could significantly improve the verticality of the fill 89 percent of the time. The study found that a high number of unfilled accessory canals exist in endodontic failures and that they can be filled successfully during retreatment. Eighty-three percent of the cases retreated evidenced complete or partial bone regeneration at the time of recall. The author concludes that nonsurgical retreatment can be utilized successfully in many cases where surgery is now employed and that the principles and techniques advocated by Schilder are particularly well­suited towards retreating these failing cases.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