title: A comparison of dimensional standard of several nickel-titanium rotary files.
abstract: OBJECTIVE
  The aim of this study was to compare the dimensional standard of several nickel-titanium (Ni-Ti) rotary files and verify the size conformity.
  
  
  METHODS
  ProFile (Dentsply Maillefer), RaCe (FKG Dentaire), and TF file (SybronEndo) #25 with a 0.04 and 0.06 taper were investigated, with 10 in each group for a total of 60 files. Digital images of Ni-Ti files were captured under light microscope (SZX16, Olympus) at 32×. Taper and diameter at D1 to D16 of each files were calculated digitally with AnalySIS TS Materials (OLYMPUS Soft Imaging Solutions). Differences in taper, the diameter of each level (D1 to D16) at 1 mm interval from (ANSI/ADA) specification No. 101 were statistically analyzed using one-way ANOVA and Scheffe's post-hoc test at 95% confidence level.
  
  
  RESULTS
  TF was the only group not conform to the nominal taper in both tapers (p < 0.05). All groups except 0.06 taper ProFile showed significant difference from the nominal diameter (p < 0.05).
  
  
  CONCLUSIONS
  Actual size of Ni-Ti file, especially TF, was different from the manufacturer's statements.
authors: Department of Conservative Dentistry, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.
authors: Ki-Won
authors: KW
authors: Kim
authors: Department of Conservative Dentistry, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.
authors: Kyung-Mo
authors: KM
authors: Cho
authors: Department of Conservative Dentistry, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.
authors: Se-Hee
authors: SH
authors: Park
authors: Department of Dental Biomaterials, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.
authors: Ki-Yeol
authors: KY
authors: Choi
authors: Department of Endodontics, University of Pennsylvania, Philadelphia School of Dental Medicine, USA.
authors: Bekir
authors: B
authors: Karabucak
authors: Department of Conservative Dentistry, Gangneung-Wonju National University College of Dentistry, Gangneung, Korea.
authors: Jin-Woo
authors: JW
authors: Kim
keywords: Diameter; Ni-Ti rotary files; Size verification; TF; Taper