title: A comparison of the shaping ability of reciprocating NiTi instruments in simulated curved canals.
abstract: OBJECTIVE
  The study was to compare the shaping ability of Reciproc (VDW) and WaveOne (Dentsply Maillefer) instruments compared with ProTaper, Profile and hand instrument during the preparation of simulated root canals.
  
  
  METHODS
  Five groups (n = 5) were established. Reciproc, WaveOne, ProTaper, Profile and K file (K-flexo file) were used to prepare the resin simulated canals. A series of preoperative and postoperative images were taken by a microscope and superimposed in 2 different layers. The amount of resin removed from both the inner and the outer sides of the canal was measured to the level of 10 mm from the apical tip, with a 1 mm increment.
  
  
  RESULTS
  The mean of resin removal from the inner canal wall was not different from the outer canal wall for Reciproc and WaveOne groups at apical third (1 - 3 mm level). There was no difference in the change of working length and maintenance of canal curvature. NiTi instruments are superior to stainless-steel K file in their shaping ability.
  
  
  CONCLUSIONS
  Within the limitation of this present study, Reciproc and WaveOne instruments maintained the original canal curvature in curved canals better than ProTaper and Profile, which tend to transport towards the outer canal wall of the curve in the apical part of the canal.
authors: Department of Conservative Dentistry, Dankook University College of Dentistry, Cheonan, Korea.
authors: Young-Sil
authors: YS
authors: Yoo
authors: Yong-Bum
authors: YB
authors: Cho
keywords: NiTi; Reciproc; Reciprocating; Shaping ability; Single file; WaveOne