PubMed · 5267277
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M H Cossman. 1970. "Endodontically treated teeth not brittle".. https://pubmed.ncbi.nlm.nih.gov/5267277/
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Nine endodontic instruments from different manufacturers (Reamers, K-files, Hedstrom files, K-Flex files, Flexofiles, S-files, Burns Unifiles, Flexicut files and Flex-R files) were used to prepare 180 simulated root canals in resin blocks. The instrument's ability to reproduce a theoretical pre-established ideal canal shape was assessed by comparing the original canal path with the resulting enlarged canal shape by a double exposure photographic method. The individual ability of each instrument to transport debris was also observed during instrumentation under a stereomicroscope. Regardless of the instrument type, none was able to reproduce ideal results; however, clinically acceptable results could be obtained with all of them. The coronal and apical debris transportation characteristics proved to be similar with all instruments.
The authors of this article observed the cross section of different brands of K file and reamer, in order to compare the reality to the square or triangular symbol. On an other hand, they defined the ideal cross section of the endodontic instrument according to the user's requirements, and studied the most approaching one.
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