نتایج جستجو برای: titanium instruments

تعداد نتایج: 97876  

2005
Yufeng Zheng Chao Li Chen Huang Liancheng Zhao

The torsion property and rotary fatigue fracture behavior of Smart K file and R reamer made of nickel titanium alloy have been studied by means of Shimadzu Autograph DDS-10T universal tester and man-made cyclic system with curved copper tubes as simulated root canal. The instrument surface and the cyclic fatigue fracture surface have been investigated by optical microscope and scanning electro...

Journal: :Australian dental journal 2007
G R Young P Parashos H H Messer

Chemomechanical preparation of the root canal includes both mechanical instrumentation and antibacterial irrigation, and is principally directed toward the elimination of micro-organisms from the root canal system. A variety of instruments and techniques have been developed and described for this critical stage of root canal treatment. Since their introduction in 1988, nickel-titanium (NiTi) ro...

Journal: :Journal of endodontics 2010
Purificación Varela-Patiño Adalce Ibañez-Párraga Berta Rivas-Mundiña Giuseppe Cantatore Xosé Luis Otero Benjamin Martin-Biedma

INTRODUCTION Rotary nickel-titanium instruments have multiple advantages but with the risk of more fractures because of flexure or torsion. Alternating rotation appears to be an alternative to continuous rotary movement. The objective of this study was to determine the influence of the type of instrument rotation on the frequency of fractures or deformation. METHODS Instrumentation was perfor...

Journal: :Journal of endodontics 2006
Xuejun Xu M Eng Yufeng Zheng D Eng

This study investigated the influence of cross-section profile on the mechanical behaviors of six commercial nickel-titanium (NiTi) root canal instruments using the finite element method. The nonlinear mechanical characteristics of the NiTi alloy were taken into account. The six root canal instruments studied were ProTaper, Hero642, Mtwo, ProFile, Quantec, and NiTiflex. Mathematical models for ...

Journal: :Annali dell'Istituto superiore di sanita 2010
Gianluca Gambarini Eugenio Tucci Rossella Bedini Raffaella Pecci Massimo Galli Valerio Milana Massimo De Luca Luca Testarelli

The goal of the study is to evaluate if the use of rotary nickel-titanium (RNT) instruments, as Hedstroem files, is safe. Twelve twisted files (TF) RNT instruments size 06-25 were selected and randomly divided in 2 groups of 6 instruments each. Group A (new instruments) were used as control. Group B (test) instruments were clinically used only as Hedstroem files in a canal that had been previou...

2013
C C Tsao J U Liou P H Wen C C Peng T S Liu

AIM To develop analytical models and analyse the stress distribution and flexibility of nickel-titanium (NiTi) instruments subject to bending forces. METHODOLOGY The analytical method was used to analyse the behaviours of NiTi instruments under bending forces. Two NiTi instruments (RaCe and Mani NRT) with different cross-sections and geometries were considered. Analytical results were derived...

2013
Ramiro Montenegro-Santillán Teresa Alegre-Domingo Vicente Faus-Matoses Vicente Faus-Llácer

OBJECTIVE The aim of this study was to compare the cyclic fatigue resistance of two nickel-titanium (NiTi) endodontic instruments from ProTaper and GT series X files. STUDY DESIGN Cyclic fatigue test was realized with instruments from ProTaper: F1 and F3 (Denstply Maillefer, Ballaigues, Switzerland) and GT-X: 20.06 and 30.08 (Dentsply Tulsa Dental, Tulsa, Oklahoma, United States of America). ...

Journal: :Australian endodontic journal : the journal of the Australian Society of Endodontology Inc 2001
C J Ruddle

The purpose of this paper is to provide useful information that will enable dentists to predictably shape root canals for three-dimensional obturation of the root canal system. The information is intended to help clinicians better understand when and how to safely use Nickel-Titanium (NiTi) rotary shaping instruments. This article is intended to enhance clinical performance for all dentists who...

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