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dc.contributor.authorGermain, Lisa P.en_US
dc.date.accessioned2019-09-17T12:54:54Z
dc.date.available2019-09-17T12:54:54Z
dc.date.issued1981
dc.date.submitted1981
dc.identifier.other15360701
dc.identifier.otherb14251061
dc.identifier.urihttps://hdl.handle.net/2144/37808
dc.descriptionBlack and white photographs included.en_US
dc.descriptionThesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1981 (Endodontics)en_US
dc.descriptionBibliography : leaves 293-298.en_US
dc.description.abstractEndodontic instruments are manufactured by many companies throughout the world. Since no evidence exists in the literature concerning the variable quality of the instruments on the market, the following investigation was undertaken with the objective to compare a sample of instruments from some of the various companies. A total of 1,680 files, reamers and hedstrom files representing seven different manufacturing companies were tested. Sizes 15, 30 and 50 were selected to represent the total size range of instruments. The following physical properties were measured: 1) Torsion; 2) Angular Deflection; 3) Stiffness; 4) Dimensional Standardization; 5) Preparation for Delivery; and 6) Corrosion Resistance. The data for each company was compared with the minimum Standard set by the ANSI for the American Dental Association in Specification No. 28 for files and reamers and Specification No. 58 for headstrom files. An analysis of variance and T-tests were also performed on the data to compare and contrast the instruments between companies. The results obtained showed that there was very little uniformity of standardization between manufacturers, as well as within manufacturing companies. The quality of the initial stainless steel wire may determine the quality and strength of the final product of an endodontic instrument. It is difficult to determine whether one instrument is better than another. Each instrument has different physical properties than every other instrument.en_US
dc.language.isoen_US
dc.publisherBoston Universityen_US
dc.rightsThis 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.en_US
dc.subjectDental instrumentsen_US
dc.subjectEndodonticsen_US
dc.titleThe structural and physical properties of endodontic instrumentsen_US
dc.typeThesis/Dissertationen_US
etd.degree.nameMaster of Science in Dentistryen_US
etd.degree.levelmastersen_US
etd.degree.disciplineEndodonticsen_US
etd.degree.grantorBoston Universityen_US


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