Instruments Fracture
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Eficiência de corte de instrumentos rotatórios de níquel-titânio para alargamento cervical de canais radiculares : análise em estereomicroscopia, perfilometria e microtomografia computadorizada
This study aimed to: evaluate, using different methods and substrates, the cutting efficiency of nickel-titanium rotary instruments for coronal flaring; investigate the influence of rotational speed and number of uses on the cutting efficiency of such instruments; observe the presence of surface defects. First, bovine dentin blocks (n=20) and acrylic blocks
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/11/2012
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14. EFEITO DO TIPO DE INSTRUMENTO E DA TÉCNICA OBTURADORA NA RESISTÊNCIA À FRATURA DE DENTES RESTAURADOS. / EFFECT OF THE INSTRUMENT TYPE AND ROOT CANAL FILLING TECHNIQUE ON FRACTURE RESISTANCE OF RESTORED ROOTS
O objetivo deste estudo foi avaliar o efeito do tipo de instrumento (limas manuais tipo K e instrumentos rotatórios de NiTi) e da técnica obturadora (condensação lateral ativa e condensação lateral passiva) na resistência à fratura. Para isso, 68 dentes (caninos e pré-molares) foram divididos em 4 grupos (n=17): G1 - instrumentação manual e conden
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2012
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15. Estudo das complicações no tratamento das fraturas transtrocanterianas do fêmur utilizando pino deslizante extramedular com técnica minimamente invasiva, Sistema Minus / Treatment of transtrochanteric fractures of the femur complications associated with the use of extramedullar slidind pin and minimally invasive Minus System techique
INTRODUCTION: The surgical treatment of intertrochanteric fractures is still controversial, resulting in further studies. Many papers have appeared in reference to the advantages of minimal invasive procedures for these fractures. The aim of this study was to evaluate the complications of a minimal invasive procedure using a specific implant and instruments
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2011
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16. Anterograde removal of broken femoral nails without opening the nonunion site: a new technique
OBJECTIVE: We describe a new technique for removing the distal fragments of broken intramedullary femoral nails without disturbing the nonunion site. METHODS: This technique involves the application of an AO distractor prior to the removal of the nail fragments, with subsequent removal of the proximal nail fragment in an anterograde fashion and removal of th
Clinics. Publicado em: 2010
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17. Analise de falhas de instrumentos endodonticos rotatorios de Ni-Ti em odontologia / Failure analysis of rotary endodontic instruments of Ni-Ti in dentistry
Rotary endodontic instruments of Ni-Ti (rotary files) are used in order to prepare endodontic dental conducts and show memory shape, high flexibility, and different designs. Although these characteristics, when used in endodontics clinic, sometimes occur fracture inside the conduct of the tooth and, as a result of that, low life, high cost, and iatrogen. The
Publicado em: 2008
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18. Resistência à fadiga flexural dos sistemas rotatórios k3 e Endosequence em razão do uso / Resistance to flexural fatigue of K3 and Endosequence rotary systems in relation to the use
The aim of this work was to evaluate the cyclic fatigue resistance of two different nickel-titanium rotary systems, K3 (Sybron Endo, EUA) and Endosequence (Brasseler, EUA), based on the number of uses. All rotary files which were selected had their conicity of 0,04, 25mm of length and tip diameter of 25, following ISO standardization. To reach the purposes,
Publicado em: 2008
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19. Influence of the tapering in the mechanical behavior of instruments of nickel-titanium / Influência da conicidade no comportamento mecânico de instrumentos de níquel-titânio
Este trabalho tem como objetivo avaliar a influência da conicidade de instrumentos de níquel-titânio acionados a motor, na flexibilidade; na resistência a fratura por torção à direita e na resistência a fratura por flexão rotativa, analisando ainda por meio de microscopia eletrônica de varredura a superfície de fratura dos instrumentos ocorridas p
Publicado em: 2008
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20. "Resistência à fadiga cíclica flexural de instrumentos rotatórios de Ni-Ti em razão do uso e do torque" / Flexural cyclic fatigue resistance of NiTi rotatory instruments due to number of users and torque.
The aim of the present study was to evaluate the flexural cyclic fatigue resistance of nickel-titanium rotary instruments, number 25, taper 0,04, and length of 25mm (K3, SybronEndo), when submitted to several torque values and number of uses in simulated canal blocks, by using devices appropriated for dynamic tests. It was tried to detect whether, in additio
Publicado em: 2007
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21. AVALIAÇÃO, IN VITRO, DE PREPAROS QUÍMICO-MECÂNICO DE CANAIS RADICULARES QUANTO AO DESVIO, LIMPEZA, MODELAGEM DO TERÇO APICAL E DEFORMAÇÕES MECÂNICAS DE INSTRUMENTOS DE NÍQUEL-TITÂNIO E AÇO INOXIDÁVEL
This study had as main objective to evaluate the apical third of root canals within cleaning, apical displacement, shaping after root canals preparations with both rotatory and alternating mechanized systems associated or not. It still had as objective, the detection of deformations and separations of endodontic flares used in the study. A total of 45 upper
Publicado em: 2007
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22. Resistência à fadiga e comportamento em torção de instrumentos endodônticos de NiTi Profile
A comparative study of the torsion behavior and of the fatigue resistance of rotary NiTi endodontic instruments was performed in this work. ProFile 20/.04, 25/.04, 30/.04, 20/.06, 25/.06 e 30/.06 instruments were analyzed at the following conditions: Control Group 01, containing 10 non-used instruments of each size and taper, tested until rupture in fatigue
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/01/2004
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23. EFEITO DO TRATAMENTO SUPERFICIAL EM LIMAS DE NITI SUBMETIDOS A CARREGAMENTO EM TORÇÃO / THE EFFECT OF SURFACE ON NITI FILES SUBJECTED TO TORSION LOADING
NiTi Profile® 25/.04 files do not undergo surface polishing treatments after machining, and therefore exhibit local stress concentrators and, consequently, areas of cracking and fractures. The effect of different surface conditions on the torsional strength of endodontic files were evaluated. 18 NiTi Profile® 25/.04 rotary files were examined by scanning e
Publicado em: 2004