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Institution

Instituto Militar de Engenharia

EducationRio de Janeiro, Brazil
About: Instituto Militar de Engenharia is a education organization based out in Rio de Janeiro, Brazil. It is known for research contribution in the topics: Fiber & Catalysis. The organization has 1405 authors who have published 2524 publications receiving 29699 citations. The organization is also known as: IME.


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Journal ArticleDOI
TL;DR: In this article, a statistical study of the effect on the polymerization process of the molar ratio of the component oxides and the water content of the mixture showed the latter to be a critical parameter.

933 citations

Journal ArticleDOI
25 Mar 2008-JOM
TL;DR: In this article, vanadium-and aluminum-free alloys have been introduced for implant applications, which are considered to be the most attractive metallic materials for biomedical applications, but vanadium can have a possible toxic effect resulting from released vanadium and aluminum.
Abstract: Titanium alloys are considered to be the most attractive metallic materials for biomedical applications. Ti-6Al-4V has long been favored for biomedical applications. However, for permanent implant applications the alloy has a possible toxic effect resulting from released vanadium and aluminum. For this reason, vanadium-and aluminum-free alloys have been introduced for implant applications.

798 citations

Journal ArticleDOI
TL;DR: The purpose of this review article is to present a brief discussion of the thermomechanical behavior of SMA and to describe their most promising applications in the biomedical area, including cardiovascular and orthopedic uses, and surgical instruments.
Abstract: Shape memory alloys (SMA) are materials that have the ability to return to a former shape when subjected to an appropriate thermomechanical procedure. Pseudoelastic and shape memory effects are some of the behaviors presented by these alloys. The unique properties concerning these alloys have encouraged many investigators to look for applications of SMA in different fields of human knowledge. The purpose of this review article is to present a brief discussion of the thermomechanical behavior of SMA and to describe their most promising applications in the biomedical area. These include cardiovascular and orthopedic uses, and surgical instruments.

450 citations

Journal ArticleDOI
TL;DR: The in vivo test suggested that, in similar conditions, the surface treatment had a beneficial effect on the implant biocompatibility measured through removal torque, and the anodized dental implant presented the highest removal torque.
Abstract: The biological properties of titanium depend on its surface oxide film. Several mechanical and chemical treatments have been used to modify the surface morphology and properties of titanium dental implants. One possible method of improving dental implant biocompatibility is to increase surface roughness and decrease the contact angle. In the present work, the biological properties of dental implants were investigated through in vivo and in vitro tests. The effects of surface roughness, contact angle and surface morphology on titanium dental implant removal torque were investigated. Machined dental implants and discs made with commercially pure titanium ASTM grade 4 were submitted to sandblasting treatments, acid etching and anodizing. The sample surface morphologies were characterized by SEM, the surface roughness parameters were quantified using a laser non-contact profilometer, and a contact angle measurement was taken. Dental implants were placed in the tibia of rabbits and removed 12 weeks after the surgery. It was found that: (i) acid etching homogenized the surface roughness parameters; (ii) the anodized surface presented the smallest contact angle; (iii) the in vivo test suggested that, in similar conditions, the surface treatment had a beneficial effect on the implant biocompatibility measured through removal torque; and (iv) the anodized dental implant presented the highest removal torque.

398 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the influence of the volumetric fraction of the fibers on the fracture toughness of geopolymeric cement concretes reinforced with basalt fibers, and found that the concretized concrete has better fracture properties than conventional Portland cement.
Abstract: The purpose of this work was to investigate the influence of the volumetric fraction of the fibers on the fracture toughness of geopolymeric cement concretes reinforced with basalt fibers. The values of fracture toughness, critical stress intensity factor and critical crack mouth opening displacement were measured on 18 notched beams tested by three-point bending. The a 0 / h (notch height/beam height) ratio was equal to 0.2 and the L 0 / h (distance between the supports/beam height) ratio was equal to 3. According to the experimental results, geopolymeric concretes have better fracture properties than conventional Portland cement. They are also less sensitive to the presence of cracks.

388 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20234
202229
2021203
2020237
2019218
2018189