title: Resistance to cyclic fatigue failure of a new endodontic rotary file.
abstract: BACKGROUND
  A new nickel-titanium (NiTi) rotary file called the ProFile Vortex (PV; Denstply, Tulsa Dental Specialties, Tulsa, OK) has recently been released for endodontic use. The purpose of this study was to compare cyclic fatigue resistance of the new size 30 PV files with size 30 files of other popular brands. Other files tested include Twisted File (TF; Sybron Dental Specialties, Orange, CA), ProFile (PF; Denstply Tulsa Dental Specialties, Tulsa, OK), GTX (GTX, Denstply Tulsa Dental Specialties), and EndoSequence (ES; Brasseler, Savannah, GA).
  
  
  METHODS
  Size 30 files with a constant .06-mm/mm taper were rotated at manufacturer-recommended speed and torque settings in a simulated canal until failure.
  
  
  RESULTS
  Significant differences were found between the various brands of files. The differences between file brands may be because of a different manufacturing process or differences in file design.
  
  
  CONCLUSIONS
  Based on a simulated canal model, the PV, TF, and GTX files appear to offer greater cyclic fatigue resistance than ES and PF files.
authors.affiliation: Department of Endodontics, University of Iowa College of Dentistry, Iowa City, Iowa 52242, USA.
authors.forename: Jason
authors.initials: J
authors.lastname: Bouska
authors.forename: Bruce
authors.initials: B
authors.lastname: Justman
authors.forename: Anne
authors.initials: A
authors.lastname: Williamson
authors.forename: Christopher
authors.initials: C
authors.lastname: DeLong
authors.forename: Fang
authors.initials: F
authors.lastname: Qian
mesh_terms: D003722:Dental Alloys / Q000737:chemistry; D004867:Equipment Design; D004868:Equipment Failure; D006801:Humans; D008422:Materials Testing; D008853:Microscopy; D008953:Models, Anatomic; D009532:Nickel / Q000737:chemistry; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry; D019415:Torque
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium