title: Comparison of the centering ability of Wave·One and Reciproc nickel-titanium instruments in simulated curved canals.
abstract: OBJECTIVE
  The aim of this study was to evaluate the shaping ability of newly marketed single-file instruments, Wave·One (Dentsply-Maillefer) and Reciproc (VDW GmbH), in terms of maintaining the original root canal configuration and curvature, with or without a glide-path.
  
  
  METHODS
  According to the instruments used, the blocks were divided into 4 groups (n = 10): Group 1, no glide-path / Wave·One; Group 2, no glide-path / Reciproc; Group 3, #15 K-file / Wave·One; Group 4, #15 K-file / Reciproc. Pre- and post-instrumented images were scanned and the canal deviation was assessed. The cyclic fatigue stress was loaded to examine the cross-sectional shape of the fractured surface. The broken fragments were evaluated under the scanning electron microscope (SEM) for topographic features of the cross-section. Statistically analysis of the data was performed using one-way analysis of variance followed by Tukey's test (α = 0.05).
  
  
  RESULTS
  The ability of instruments to remain centered in prepared canals at 1 and 2 mm levels was significantly lower in Group 1 (p < 0.05). The centering ratio at 3, 5, and 7 mm level were not significantly different.
  
  
  CONCLUSIONS
  The Wave·One file should be used following establishment of a glide-path larger than #15.
authors.affiliation: Department of Conservative Dentistry, Wonkwang University School of Dentistry, Iksan, Korea.
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Lim
authors.forename: Su-Jung
authors.initials: SJ
authors.lastname: Park
authors.forename: Hyeon-Cheol
authors.initials: HC
authors.lastname: Kim
authors.forename: Kyung-San
authors.initials: KS
authors.lastname: Min
keywords: Centering ratio; Nickel-Titanium instrument; Reciproc; Wave·One