A study of flexibility of ground and twisted K-type reamers and files
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Abstract
Thirty-two twisted and ground reamers and files were tested 1,280 times under different loads, 200, 250, 300, 350, 400, 500 and 600 gm, to evaluate their flexibility. A special instrument was constructed that would accept 25 and 29 mm instruments and also the metal shaft of cut reamers and files.
When the 25 mm twisted reamers and files were tested and compared against the 29 mm ground reamers and files, the ground reamer size 50 and the ground files size 20, 25, 30 and 45 proved to be more flexible than their twisted counterparts.
When the metal shaft of the ground and twisted reamers and files were cut 22 mm from the tip (D1) of the instrument and then tested for flexibility, different results were obtained. Consistently, twisted reamers sizes 15, 25, 35 and 45 proved to be more flexible than the ground ones, while ground reamers sizes 40 and 50 were more flexible than the twisted ones. Twisted file sizes 25, 35, 45 and 50 proved to be more flexible than the ground ones, while ground file size 30 was more flexible than the twisted one.
Although the twisted reamers and files were more flexible 63.4% of the time, they also proved to be thinner in diameter than the ground reamers and files.
Description
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry. Dept. of Endodontics, 1982.
Includes bibliography: leaves 114-116.
Includes bibliography: leaves 114-116.
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This 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.