Instruments Fracture
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Photogrammetry and 3D prototyping: A low-cost resource for training in veterinary orthopedics
RESUMO: A prototipagem rápida (PR) é uma tecnologia inovadora que permite obter o protótipo de um molde com rapidez e precisão a partir de um modelo virtual. Esse estudo objetivou estabelecer o uso da fotogrametria e prototipagem 3D para a produção de biomodelos de ossos da espécie canina, para treinamento em técnicas ortopédicas em Medicina Veteri
Cienc. Rural. Publicado em: 25/11/2019
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2. Torsional fatigue strength of reciprocating and rotary pathfinding instruments manufactured from different NiTi alloys
Abstract To evaluate the torsional properties of engine-driven pathfinding instruments manufactured from different NiTi alloys – R-Pilot (tip size 12.5;.04 taper; M-Wire) and One G (tip size 14;.03 taper; Conventional NiTi). A total of 40 NiTi instruments from engine-driven pathfinding instruments (n = 20) were used. The torsion tests followed ISO 3630-1 (
Braz. oral res.. Publicado em: 28/10/2019
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3. Cyclic fatigue resistance of novel Genius and Edgefile nickel-titanium reciprocating instruments
Abstract: This study aimed to assess the cyclic fatigue resistance of Genius and EdgeFile X1 reciprocating instruments compared with WaveOne Gold Primary. Twenty Genius (Ultradent) 25.04, 20 Genius 30.04, 20 EdgeFile X1 (EdgeEndo) and 20 WaveOne Gold Primary (Dentsply Maillefer) instruments were included in this study and tested in a static cyclic fatigue te
Braz. oral res.. Publicado em: 11/04/2019
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4. Caracterização de lesões bucomaxilofaciais decorrentes de agressão física: diferenças entre gênero
Resumo Em países desenvolvidos, a violência é a principal causa de lesões bucomaxilofaciais (LBMF). No Brasil, há poucas evidências sobre tais lesões. Objetivou-se caracterizar as LBMF resultantes de agressão física em uma capital do nordeste brasileiro e analisar diferenças entre gêneros. Foram investigados 15.847 laudos do Instituto Médico Lega
Ciênc. saúde coletiva. Publicado em: 2019-03
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5. Releasing systems for aerospace industry based upon Shape Memory Alloys: characterization of materials for actuators
ABSTRACT Releasing and deployment maneuvers carried out during space satellites launching are usually performed by utilizing pyrotechnics loads. However, it is considered convenient to replace this technique by others not requiring explosives (Non Explosive Actuators-NEA). This is mainly due to the necessity of reducing high-shock and vibrations induced leve
Matéria (Rio J.). Publicado em: 19/07/2018
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6. The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments
ABSTRACT Torsional overload is a fracture representative parameter for instruments in single-file techniques. Objective The aim of this study was to assess the influence of clinical use, in vivo, on the torsional behavior of Reciproc and WaveOne instruments considering the possibility that they degraded with use. Material and Methods Diameter at each mil
J. Appl. Oral Sci.. Publicado em: 2016-08
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7. Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study
Abstract This study aimed to compare apical transportation, centering ratio, and working time during root canal preparation with Wizard Navigator (WN), WaveOne (WO), or ProTaper Universal (PT) and to describe deformation and fracture of these instruments. Thirty-six mesiobuccal roots from maxillary molars were micro-computed tomography (micro-CT) scanned and
Braz. oral res.. Publicado em: 14/06/2016
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8. A comparison of two reciprocating instruments using bending stress and cyclic fatigue tests
The aim of this study was to comparatively evaluate the bending resistance at 45º, the static and dynamic cyclic fatigue life, and the fracture type of the WaveOne (Dentsply Maillefer, Ballaigues, Switzerland) 25-08 and Reciproc (VDW, Munich, Germany) 25-08 instruments. A total of 60 nickel-titanium (NiTi) instruments (30 Reciproc and 30 WaveOne) from three
Braz. oral res.. Publicado em: 20/10/2015
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9. Cyclic fatigue resistance of two nickel-titanium instruments in different curving angles: a comparative study
The cyclic resistance of ProTaper Universal (size 25/08) and ProTaper Next (size 25/06) instruments was compared in artificial canals with different curvatures in this study. A total of 30 ProTaper Universal and 30 ProTaper Next instruments were divided into 6 groups (n = 10) and were operated into artificial canals with 3 different angles of curvature (45°
Braz. oral res.. Publicado em: 20/10/2015
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10. Effect of different torques in cyclic fatigue resistance of K3 rotary instruments
Aim: To assess the effect of different torque values on cyclic fatigue resistance of K3 rotary nickel-titanium (NiTi) files.
Methods: Eighty K3 files, size 25 mm, taper 0.04 were divided in 4 groups according to different torques (0.5, 1, 2 and 6 Ncm) and were submitted to a cyclic fatigue test. This tes
Braz. J. Oral Sci.. Publicado em: 2015-06
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11. Effect of root canal preparation, type of endodontic post and mechanical cycling on root fracture strength
Objective: To evaluate the impact of the type of root canal preparation, intraradicular post and mechanical cycling on the fracture strength of roots. Material and Methods: eighty human single rooted teeth were divided into 8 groups according to the instruments used for root canal preparation (manual or rotary instruments), the type of intraradicular post
J. Appl. Oral Sci.. Publicado em: 2014-06
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12. Experimental evaluation of cyclic fatigue resistance of four different nickel-titanium instruments after immersion in sodium hypochlorite and/or sterilization
NiTi instruments have a high risk of separation due to torsional or flexural fatigue (cyclic fatigue). Chemomechanical preparation, cleaning procedures, chemical disinfection and sterilization cause the corrosion of endodontic instruments that may weaken the fracture resistance of the instruments. Objective To assess the effects of NaOCl immersion and auto
J. Appl. Oral Sci.. Publicado em: 2013-12