نتایج جستجو برای: file fracture

تعداد نتایج: 151799  

Journal: :iranian endodontic journal 0
rudra kaul riyaz farooq vibhuti kaul shafayat ullah khateeb aamir rashid purra roopali mahajan

introduction : the aim of the present study was to comparatively evaluate the physical surface changes and incidence of separation in rotary nickel-titanium (niti) instruments using scanning electron microscope (sem). methods and materials: a total number of 210 freshly extracted human maxillary and mandibular first molars were selected and distributed between three groups. three different syst...

Journal: :Acta odontologica latinoamericana : AOL 2013
Javier L Niño-Barrera Mara C Aguilera-Cañón Carlos J Cortes-Rodríguez

Nickel-Titanium rotary files are a technological development that enables dentists to prepare irregularly shaped root canals without altering them. Unfortunately, these files may fracture without any prior visible warning signs. The aim of this study was to perform a theoretical evaluation of the mechanical behaviour of Mtwo Nickel-Titanium rotary files for endodontics, in order to determine wh...

آل یس, زینب السادات, شهریاری, شهریار, صدیق شمسی, مهدی, عباس زادگان, عباس,

Introduction: Cleaning and shaping of the root canal system with an efficient and safe technique are the major goals of root canal treatment. The aim of this study was to compare the conventional root canal preparation technique by hand instruments and Gates Glidden drills with ProTaper Universal Rotary system on the root susceptibility to vertical fracture. Methods: Thirty extracted human man...

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...

2014
Thanumalayan Sankaranarayana Pillai Andrea C. Arpaci-Dusseau Remzi H. Arpaci-Dusseau

We introduce Fracture, a novel framework that transforms and modernizes the basic process abstraction. By “fracturing” an application into logical modules, Fracture enables powerful and novel run-time configurations that improve run-time testing, application availability, and general robustness, all in a generic and incremental manner. We demonstrate the utility of fracturing via in-depth case ...

Journal: :Journal of endodontics 2005
Nigel J Souter Harold H Messer

A technique utilizing modified Gates Glidden burs and ultrasonics has recently been advocated to remove fractured instruments from root canals. Varying extents of tooth structure are removed during this procedure, potentially leading to complications. This study evaluated the in vitro and in vivo complications associated with fractured file removal. Fractured instrument fragments were removed f...

جلال زاده, سیدمحسن, شهریاری, شهریار ,

Introduction & Objective: Now days a considerable progress in the production of instruments for canal preparation can be seen. Efficiency and resistance of files during canal preparation are very important. The aim of this study was to compare surface defects in Aryatec, Mailifer Stainless-Steel(ss) and Mailifer Nickle-Titanium(Ni-Ti) K-files before and after canal preparation. Materials &...

2017
Kee-Yeon Kum Seok Woo Chang

The aim of this study was to investigate the effect of 50% hydrofluoric acid (HF) surface treatment on the cyclic fatigue resistance (CFR) of K3 NiTi instruments. Twenty as-received and twenty HF-treated K3 NiTi instruments were compared in CFR. The surface texture and fracture surface of two instrument groups were examined with a scanning electron microscope (SEM). Additionally, any change of ...

Journal: :Journal of endodontics 2012
Hyeon-Cheol Kim Sang-Won Kwak Gary Shun-Pan Cheung Dae-Hoon Ko Se-Min Chung WooCheol Lee

INTRODUCTION The use of reciprocating movement was claimed to increase the resistance of nickel-titanium (NiTi) file to fatigue in comparison with continuous rotation. Recently 2 new brands of NiTi files have been marketed for use in a RM mode. The purpose of this study was to compare the cyclic fatigue resistance and torsional resistance of these 2 files, Reciproc and WaveOne. METHODS Cyclic...

Journal: :Journal of clinical and diagnostic research : JCDR 2015
Vijayakumar L Shiraguppi Hema B S Chandu G S Niranjan Desai Antriksh Azad

INTRODUCTION Present study evaluated the fracture resistance of endodontically treated teeth filled with Gutta percha and a new resin based obturating material (Resilon). MATERIALS AND METHODS A total of 150 freshly extracted Mandibular premolar with fully formed apices were selected and decoronated at cemento-enamel junction (CEJ). Teeth were divided into Group A and Group B of 75 teeth each...

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