An in vitro comparison of torsional stress properties of three different rotary nickel-titanium files with a similar cross-sectional design.

Introduction: The purpose of this study was to compare the in vitro torsional stress characteristics of Twisted Files (TFs; SybronEndo, Orange, CA) with 2 milled files of a similar cross-section: EndoSequence (Brasseler USA, Savannah, GA) and ProFile Vortex (DENTSPLY Tulsa Dental, Tulsa, OK).

Methods: File sizes of 25/.06 and 30/.