Drills
Mostrando 13-24 de 54 artigos, teses e dissertações.
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13. Desempenho de Ferramentas Reafiadas - Furação
The present work evaluated the performance of step drills, new and after regrinding. The way of regrinding the drills after they reached the end of tool life criterion was also varied. The following variables were also considered: type of coatings (uncoated, TiAlN e AlCrN) and the routine of re-coating them after regrinding (no recoating, recoating over the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011
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14. Assessment of simulated mandibular condyle bone lesions by cone beam computed tomography
There are many limitations to image acquisition, using conventional radiography, of the temporomandibular joint (TMJ) region. The Computed Tomography (CT) scan is a better option, due to its higher accuracy, for purposes of diagnosis, surgical planning and treatment of bone injuries. The aim of the present study was to analyze two protocols of cone beam comp
Brazilian Oral Research. Publicado em: 2010-12
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15. Evaluation of the antimicrobial effect of super-oxidized water (Sterilox®) and sodium hypochlorite against Enterococcus faecalis in a bovine root canal model
ABSTRACT Ideally root canal irrigants should have, amongst other properties, antimicrobial action associated with a lack of toxicity against periapical tissues. Sodium hypochlorite (NaOCl) is a widely used root canal irrigant, however it has been shown to have a cytotoxic effect on vital tissue and therefore it is prudent to investigate alternative irrigants
Journal of Applied Oral Science. Publicado em: 2010-10
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16. Stochastic dynamics of a drill-string with uncertain weight-on-hook
A drill-string is a slender structure that turns and drills into the rock in search of oil. There are many sources of uncertainties in this complex dynamical system. However, this article is concerned only with uncertainties in the weight-on-hook, which is the supporting force exerted by the hook at the top. A probabilistic model is constructed for the rando
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-09
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17. Study of the discrepancy between the areas of the initial apical instrument and of the apical foramen in the maxillary incisors / Estudo da discrepância entre as áreas do instrumento apical inicial e do forame apical nos incisivos centrais superiores
The aim of this study was to study the discrepancy between the areas of initial apical instrument (IAI) and major foramen of central maxillary incisives by scanning electronic microscopy. Fifty teeth received cervical preparation with LA Axxess drills. K-files were then introduced in root canal, in gradual increase of diameter, until tactile adjustment one m
Publicado em: 2010
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18. Influence of adhesion between coating and substrate on the performance of coated HSS twist drills
This work analyses the performance of the TiN/TiCN, TiAlN, TiN/TiAlN and TiN/TiAlN/WCC coatings on HSS M2 drills used in the drilling of the aluminium-silicon alloy ISO 3522 AlSi8Cu3Fe, correlating the life of the tools to the coating adhesion characterization experiments. Coating adhesion was characterized using Rockwell C indentation tests and scratch test
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-12
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19. Evaluation of simulated bone lesion in the head of the mandible by using multislice computed tomography
Conventional radiography has shown limitation in acquiring image of the ATM region, thus, computed tomography (CT) scanning has been the best option to the present date for diagnosis, surgical planning and treatment of bone lesions, owing to its specific properties. OBJECTIVE: The aim of the study was to evaluate images of simulated bone lesions at the head
Journal of Applied Oral Science. Publicado em: 2009-10
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20. Burr produced on the drilling process as a function of tool wear and lubricant-coolant conditions
This work shows the resulting height and shape of the burrs produced by drilling holes with ratio L/D = 3. The tool used in the tests was the solid twist HSS drill coated with TiAlN, with diameter of 10 mm, to drill the microalloyed steel DIN 38MnS6. The height of the burr was studied under different lubricant/coolant systems, namely: dry machining, use of M
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-03
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21. Life Twist Drills Used in Implantodology and Influence of the Cutting Conditions / Determinação da vida de brocas utilizadas em implantodontia e influência das condições de corte
O objetivo deste trabalho é determinar a vida de brocas para implantodontia através de furação em tíbia bovina e estudar a influência das condições de corte utilizadas. As variáveis de entrada do trabalho foram o material de ferramenta, a velocidade de avanço e a rotação. E as variáveis de saída monitoradas foram o número de furos realizados,
Publicado em: 2009
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22. PolidorÃdeos (Polychaeta: spionidae) em Crassostrea rhizophorae (Mollusca: bivalvia) de cinco rios da costa pernambucana
The Crassostrea rhizophorae occurs along the coast of Brazil serving as food to coastal communities and its production helps the local socio-economic development. Polydiariosis is one of several diseases in the world oyster culture. This disease is caused by a polychaete which drills the shell and inhabits a mud blister inside the oyster; thus, the oysterâs
Publicado em: 2009
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23. Wittgenstein e a gramática da consciência / Wittgenstein and the grammar of consciousness
The aim of this dissertation is to point out and solve certain difficulties concerning the private-language argument as it is approached in Wittgensteins later philosophy. These difficulties arise because the private-language argument rests upon the view that our learning a language relies on practices that function as drills. Based on this view, when it com
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/01/2008
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24. Adhesive cementation of zirconia posts to root dentin: evaluation of the mechanical cycling effect
This study evaluated the effect of mechanical cycling on the bond strength of zirconia posts to root dentin. Thirty single-rooted human teeth were transversally sectioned to a length of 16 mm. The canal preparation was performed with zirconia post system drills (CosmoPost, Ivoclar) to a depth of 12 mm. For post cementation, the canals were treated with total
Brazilian Oral Research. Publicado em: 2008-09