title: Effect of rotational speed on nickel-titanium file distortion.
abstract: Separation of instruments while performing root canals is something that has plagued all practitioners. The purpose of this study was to evaluate the effect of rotational speed on nickel-titanium file distortion and separation. Forty extracted human molars were instrumented with Profile (Dentsply Tulsa Dental Products, Tulsa, OK) ISO .04 rotary nickel-titanium instruments at 166.67 or 333.33 rpm. The instruments were evaluated after instrumentation for separation and/or distortion. The results of this study were statistically significant and indicate that file distortion and/or separation is four times as likely to occur at 333.33 rpm vs. 166.67 rpm.
authors.affiliation: University of Detroit Mercy School of Dentistry, MI, USA.
authors.forename: W P
authors.initials: WP
authors.lastname: Gabel
authors.forename: M
authors.initials: M
authors.lastname: Hoen
authors.forename: H R
authors.initials: HR
authors.lastname: Steiman
authors.forename: F E
authors.initials: FE
authors.lastname: Pink
authors.forename: R
authors.initials: R
authors.lastname: Dietz
mesh_terms: D003755:Dental High-Speed Technique; D003762:Dental Instruments; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D009532:Nickel; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D014025:Titanium
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium