An investigation of the envelope of motion and its effect on final canal shape
Kaufmann, Robert M.
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The purpose of the study was to investigate the action of the reamer through its envelope of motion and how this action affects the final results in shaped root canals. Root canal models, made from casting acrylic, were used to examine the effects of modification of reamer curvature, and rate of rotation and withdrawal on the post operative shapes of forty curved and forty straight simulated root canals. The canals were shaped according to standard B.U. technique, with modifications made In the area of reamer manipulation. Reamers were used with three types of curvatures, Straight (unmodified), Minor Curvature, and Major Curvature. These reamers were used with two types of motions: (1) The classic Envelope of Motion CE.M.) In which the reamer Is passively placed, and then given one ful I turn while belng rapidly withdrawn from the canal. (2) Rapid rotation and slow withdrawal In which the reamer Is "spun" while being slowly withdrawn from the canal. Each of the canals was photographed and measured, graphed and examined pre- and post-operatively using an optical comparator. The shaped canals were then graded and a composite grade was given for each combination of reamer curvature and motion type. [TRUNCATED]
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 firstname.lastname@example.org.Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1986 (Endodontics)Bibliography: leaves 98-107.
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