title: Evaluation of the efficiency of a new file removal system in comparison with two conventional systems.
abstract: A novel file-removal system (FRS) was designed to address weak points of conventional file-removal methods. The purpose of this study was to compare file-removal time and dentin removal rates among the FRS, the Masserann kit (Micro-Mega, Besancon, France), and an ultrasonic file-removal method. Ninety extracted mandibular incisors with separated nickel titanium files were divided into 3 groups of 30 teeth each. Groups 1, 2, and 3 had file-removal attempts made by using the Masserann kit, a CPR-7 titanium ultrasonic tip (Obtura-Spartan Corp., Fenton, MO), and the FRS, respectively. Each group had three operators removing the separated files. Pre-/postoperative digital radiographs were downloaded into image analyzing software that calculated the amount of dentin removed. The FRS needed less time and had less dentin loss than the others (p<0.05). There were statistical differences between the experienced operator and less experienced operators regarding the file-removal time and the dentin removal rates (p<0.05).
authors: Pulp Biology and Endodontics Section, Tokyo Medical and Dental University, Tokyo, Japan. terauti@tk.usen.ne.jp
authors: Yoshitsugu
authors: Y
authors: Terauchi
authors: Le
authors: L
authors: O'Leary
authors: Izumi
authors: I
authors: Kikuchi
authors: Mami
authors: M
authors: Asanagi
authors: Takatomo
authors: T
authors: Yoshioka
authors: Chihiro
authors: C
authors: Kobayashi
authors: Hideaki
authors: H
authors: Suda
mesh_terms: D006801:Humans; D007180:Incisor; D018915:Root Canal Preparation / Q000295:instrumentation*; D013997:Time Factors; D014464:Ultrasonic Therapy / Q000295:instrumentation*