Orthodontic Alloy
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Chemical analysis and Vickers hardness of orthodontic mini-implants
Orthodontic mini-implants are used in clinical practice to provide efficient and aesthetically-pleasing anchorage. AIM: To evaluate the hardness Vickers hardness and chemical composition of mini-implant titanium alloys from five commercial brands. METHODS: Thirty self-drilling mini-implants, six each from the following commercial brands, were used: Neodent N
Braz. J. Oral Sci.. Publicado em: 2015-03
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2. Retrieval analysis of different orthodontic brackets: the applicability of electron microprobe techniques for determining material heterogeneities and corrosive potential
OBJECTIVE: The objective of this study was to investigate the applicability of micro-analytical methods with high spatial resolution to the characterization of the composition and corrosion behavior of two bracket systems. MATERIAL AND METHODS: The surfaces of six nickel-free brackets and six nickel-containing brackets were examined for signs of corrosion an
J. Appl. Oral Sci.. Publicado em: 2012-08
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3. The effect of electric spot-welding on the mechanical properties of different orthodontic wire alloys
The aim of this study was to test the hypothesis that there is a direct relationship between surface structure and tensile strength of orthodontic alloys submitted to different levels of welding current. Three types of alloys were assessed. One hundred and eight cross-sectional test specimens ("X") were made, 18 for each wire combination, and divided into 6
Materials Research. Publicado em: 29/05/2012
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4. The effect of residence time on the tensile properties of superelastic and thermal activated Ni-Ti orthodontic wires
Since the 1980s, different devices based on superelastic alloys have been developed to fulfill orthodontic applications. Particularly in the last decades several researches have been carried out to evaluate the mechanical behavior of Ni-Ti alloys, including their tensile, torsion and fatigue properties. However, studies regarding the dependence of elastic pr
Materials Research. Publicado em: 05/08/2011
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5. Mechanical evaluation of space closure loops in Orthodontics
This study evaluated the mechanical performance of teardrop-shaped loops and teardrop-shaped loops with helix used in orthodontic space closure. Sixty retraction loops made with 0.019" x 0.025" stainless steel (SS) and beta-titanium (BT) wires were used. They were attached to a testing machine to measure the magnitudes of the sagittal force and the load-defl
Brazilian Oral Research. Publicado em: 21/01/2011
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6. Metallographic analysis of the internal microstructure of orthodontic mini-implants
Effective orthodontic anchorage may be obtained by miniimplants inserted into the maxillary bones. However, the risk of miniimplant failure is one of the most important issues, especially the rupture of its structure referred to as fracture, mainly due to metal deficiencies. This study analyzed the internal microstructure of orthodontic mini-implants, ascert
Brazilian Oral Research. Publicado em: 2010-12
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7. A utilização de fios metálicos em ortodontia / The use of wires in orthodontic
Este trabalho tem por objetivo realizar uma revisão dos conhecimentos existentes sobre os fios metálicos utilizados na especialidade de ortodontia. Serão abordadas as principais características dos diferentes materiais, propriedades, indicações, vantagens e desvantagens das figas. A grande variedade de fios à disposição do ortodontista deixa, muitas
Publicado em: 2010
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8. AVALIAÇÃO DE FORÇAS LIBERADAS POR ALÇAS EM FORMA DE GOTA UTILIZADAS EM MECÂNICA ORTODÔNTICA PARA FECHAMENTO DE ESPAÇOS / EVALUATION OF FORCES DELIVERED BY TEARDROP LOOPS USED IN ORTHODONTIC MECHANICS FOR CLOSING SPACES
O objetivo desta pesquisa foi investigar os efeitos da altura, secção transversal e tipo de liga no desempenho mecânico de alças confeccionadas em forma de gota, indicadas para a retração de incisivos e para a retração em massa de incisivos e caninos, buscando avaliar o comportamento das mesmas em relação às magnitudes de força ótima existentes
Publicado em: 2010
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9. Caracterização termomecânica de compósitos híbridos com memória de forma
The Shape Memory Alloys - SMA - are materials with the ability to recover a certain geometric form previously established upon heating. This singular behavior enables their application in many situations, from orthodontic arches and medical instruments to adaptative structures for shape and vibration control. Due to the complexity of their thermomechanical b
Publicado em: 2008
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10. Análise in vitro da corrosão de branquetes revestidos por nitreto de titânio / In vitro analysis of corrosion from titanium nitrate coated brackets
The metallic alloys used in the manufacture of orthodontic appliances when exposed to the oral environment are subjected to chemical, mechanical and physical alterations, which could lead to a corrosion process. The metallic ions released from this process may induce adverse effects in the organism leading to hypersensitivity and cytotoxicity reactions. With
Publicado em: 2006
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11. EFEITOS CORROSIVOS ENCONTRADOS EM MATERIAIS MAGNÉTICOS EMPREGADOS EM ORTODONTIA
The employment of magnetic alloys have allowed the criation of new options on odontological therapies, specially in orthodontics, where its utilization is already quite outspread. The innovation with the use of magnets came with the introduction of new magnetic alloys based on elements rare earth that belong to the lanthanum family as well as the samarium-co
Publicado em: 2006