title: Machining efficiency of nickel-titanium K-type files in a linear motion.
abstract: The purpose of this study was to compare, in vitro, the machining efficiency of four brands of nickel-titanium files and two brands of stainless steel K-type files. Instruments sizes 15 to 40 were tested in a linear motion simulating the clinical motion used to remove a file from the canal. The tips of the loaded files were in contact with a resin block. The load applied increased with file size. An indentation varnish caliper was used to measure the depth of the groove after 100 back-and-forward motions. The stainless steel instruments with a triangular cross-section were more efficient than the stainless steel instruments with a square cross-section. There was a significant discrepancy between the machining ability of the nickel-titanium K files. The Maillefer instruments were the most efficient.
authors.affiliation: Department of Restorative Dentistry and Endodontics, Faculty of Dentistry, Unité IMEB, Marseille, France.
authors.forename: J J
authors.initials: JJ
authors.lastname: Camps
authors.forename: W J
authors.initials: WJ
authors.lastname: Pertot
mesh_terms: D000497:Alloys; D000704:Analysis of Variance; D003722:Dental Alloys; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D008422:Materials Testing; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods; D013193:Stainless Steel; D014025:Titanium
chemical_list: D000497:Alloys; D003722:Dental Alloys; D013193:Stainless Steel; C013616:nitinol; D009532:Nickel; D014025:Titanium