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Your search keyword '"Felipe Augusto de Aguiar Possoli"' showing total 8 results
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8 results on '"Felipe Augusto de Aguiar Possoli"'

1. Fixation of the Anterior Ligament Graft at the Tibial Pole: Biomechanical Analysis of Three Methods

Author

Fernando Pessoa Weiss, Felipe Augusto de Aguiar Possoli, Isabel Ziesemer Costa, Paulo César Borges, Edmar Stieven Filho, and Luiz Fernando Kubrusly

Subjects
anterior cruciate ligament, surgical fixation devices, tibia, Medicine, Orthopedic surgery, RD701-811
Abstract

Abstract Objective Comparative biomechanical analysis of tibial fixation strength for ligament reconstruction with interference screw compared with screw post and washer, and compared with the associated fixation of both methods (hybrid fixation). Method A total of 54 specimens were used (porcine tibias and bovine flexor digital tendons), which were divided into three groups with fixation types similar to those used in anterior cruciate ligament (ACL) reconstruction: 1) fixation with interference screw; 2) fixation with screw post and toothed washer over knot and suture strand; and )- fixation with screw post and washer combined with interference screw (hybrid fixation). The analyses were performed through pull-out biomechanical tensile tests to determine the stiffness and load to system failure (yield load). Results The hybrid fixation group presented a significantly higher final stiffness (59.10 ± 3.45 N/mm) in comparison to the other groups (p < 0.05) and a higher yield load (581.34 ± 33.48 N) compared to the interference screw group (p < 0.05). Conclusion Hybrid fixation had biomechanical advantages over the bovine digital flexor graft fixation system in swine tibia during tensile tests.

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3. Fixação do enxerto do ligamento cruzado anterior no polo tibial: Análise biomecânica de três métodos

Author

Fernando Pessoa Weiss, Edmar Stieven Filho, Luiz Fernando Kubrusly, Paulo César Borges, Isabel Ziesemer Costa, and Felipe Augusto de Aguiar Possoli

Subjects
Orthodontics, 030222 orthopedics, Washer, Materials science, Anterior cruciate ligament, 030229 sport sciences, General Medicine, 03 medical and health sciences, Fixation (surgical), 0302 clinical medicine, medicine.anatomical_structure, Ultimate tensile strength, Ligament, medicine, Orthopedics and Sports Medicine, Surgery, Tibia, Tibial fixation, Graft fixation
Abstract

Resumo Objetivo Análise biomecânica comparativa da resistência da fixação tibial para reconstrução ligamentar com parafuso de interferência, comparada com parafuso do tipo poste com arruela, e com fixação associada entre os métodos (fixação híbrida). Métodos Foram utilizados 54 corpos de prova (tíbia suína e tendão digital bovino), que foram divididos em 3 grupos com tipos de fixação semelhantes àqueles utilizados na reconstrução do ligamento cruzado anterior: 1) fixação com parafuso de interferência; 2) fixação com parafuso do tipo poste com arruela dentada sobre nó e fios de sutura; e 3) fixação com parafuso do tipo poste com arruela combinada com parafuso de interferência (fixação híbrida). Os testes foram realizados por meio de ensaios biomecânicos de tração tipo pull-out para determinação da rigidez e carga para falha (yield load) do sistema. Resultados O grupo com fixação híbrida apresentou maior rigidez final (59,10 ± 3,45 N/mm) do que os demais grupos (p Conclusão A fixação híbrida apresentou vantagens biomecânicas com relação ao sistema de fixação do enxerto de flexor digital bovino em tíbia suína durante os ensaios de tração.

Published
2019
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4. AISI 420 martensitic stainless steel corrosion resistance enhancement by low-temperature plasma carburizing

Author

Felipe Augusto de Aguiar Possoli, Rodrigo Perito Cardoso, Cristiano José Scheuer, Silvio Francisco Brunatto, and Paulo César Borges

Subjects
Materials science, General Chemical Engineering, Metallurgy, 02 engineering and technology, Plasma, Martensitic stainless steel, Atmospheric temperature range, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 0104 chemical sciences, Corrosion, Carburizing, engineering, 0210 nano-technology, Polarization (electrochemistry), Solid solution
Abstract

Corrosion resistance of plasma carburized AISI 420 martensitic stainless steel was evaluated by cyclic polarization test in 3.5% NaCl solution. Two distinct treatment groups were studied with the purpose of evaluating the influence of the carburizing temperature and time on the corrosion behavior of treated material (one at 350–500 °C temperature range for 8, and 12 h times; and other one at 400 °C for 12–48 h time range, and at 450 °C for 4–16 h time range). To support the discussions on electrochemical test results, microstructural characterization was carried out using metallographic analysis and XRD techniques. Microstructural characterization results show that low temperature and short time treatments produce outer layer composed by α′C and Fe3C phases. High temperature and/or long time treatments promote outer layer Cr7C3 and Cr23C6 phases precipitation. Corrosion test results show improved carburized samples resistance, which is related to chromium-carbides precipitation-free outer layer formation. The Cr-carbides formation promotes a reduction on carburized samples corrosion resistance due to depletion of Cr in the solid solution of carburized layer. Finally, by confronting the behavior of untreated and carburized samples, it is verified the potentialities of the low-temperature plasma carburizing to enhance the corrosion resistance of AISI 420 MSS.

Published
2019
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