Investigation on the shaping ability of nickel-titanium files when used with a reciprocating motion

Vittorio Franco, Cristiano Fabiani, Silvio Taschieri, Augusto Malentacca, Monica Bortolin, Massimo Del Fabbro

Research output: Contribution to journalArticlepeer-review


Introduction: The introduction of nickel-titanium (NiTi) files into clinical practice has improved the quality of canal shaping, but increasing the curvature of the root canal (or the diameter of the master instrument that prepares the full working length) could result in more transportation, straightening, and aberration of the canal. Nickel-titanium instruments are significantly safer and have an extended cyclic fatigue life when used with a reciprocating movement. The purpose of this study was to compare the shaping ability of FlexMaster NiTi instruments when used in either continuous or reciprocating movements. Methods: Thirty-two Endo Training Blocks ISO 15, 2% taper, 10-mm radius of curvature, and 70° angle of curvature were prepared, according to the group, with FlexMaster NiTi instruments either in continuous rotation or in reciprocating (60° clockwise, 40° counterclockwise) movement. Preoperative and postoperative images of the simulated canals were taken under standardized conditions. The preoperative and postoperative images were combined exactly. The amount of resin removed was determined both for the inner (convex) and the outer (concave) sides of the curvature at 10 different points. Results: In the most apical third of the canal, the Continuous group produced the largest enlargement of the canal as compared with the Reciprocating group (P

Original languageEnglish
Pages (from-to)1398-1401
Number of pages4
JournalJournal of Endodontics
Issue number10
Publication statusPublished - Oct 2011


  • Dental instruments
  • dental models
  • instrumentation methods
  • NiTi

ASJC Scopus subject areas

  • Dentistry(all)


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