title: Machining efficiency of Flex-R, K-Flex, Trio-Cut, and S Files.
abstract: Many root canal instruments with several different designs have been introduced during recent years. This article evaluates the machining properties of four such instruments: the Flex-R, K-Flex, Trio-Cut, and S file. There are large variations in the machining properties of these instruments. The results are comparable to findings when evaluating conventional root canal files which show that the Hedstrom file is much more efficient when considering removal of material than the K file. The Flex-R file, K-Flex file, and Trio-Cut file are similar in design. The two former brands perform in a similar fashion, while the Trio-Cut file is less efficient than any of the evaluated K files. The S file performs as a Hedstrom file which can be expected from its similarity in design to that instrument.
authors.affiliation: Faculty of Odontology, University of Umea, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Stenman
authors.forename: L S
authors.initials: LS
authors.lastname: Spångberg
mesh_terms: D004867:Equipment Design; D008768:Methylmethacrylates; D012390:Root Canal Therapy / Q000295:instrumentation*
chemical_list: D008768:Methylmethacrylates