FRANCISCO JOSE CORREA BRAGA
24 resultados
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Artigo IPEN-doc 23919 Direct manufacture of hydroxyapatite scaffolds using blue laser2015 - MEIRA, CAMILA R. de; GOMES, DANNYLO T.; BRAGA, FRANCISCO J.C.; PURQUERIO, BENEDITO de M.; FORTULAN, CARLOS A.The study deals with the direct manufacturing of hydroxyapatite scaffolds using selective polymerization of the slurry liquid phase. The bovine hydroxyapatite has great similarity with the human bone structure, making it able for a direct connection with the bone tissues. This study aims to obtain scaffolds using a new technique of rapid prototyping, obtained by polymerization of acrylic resin (liquid phase of slurry) by ultraviolet light present in a range of the band spectrum emitted by the blue laser light. Sub-micrometer hydroxyapatite was obtained by the calcination and grinding of bovine bone in a vibratory mill. Mixtures of hydroxyapatite and resin were prototyped in three-dimensional pieces and sintered afterword and subjected to blue laser emission path directed in a CNC equipment. Grounded particles obtained in the grinding vibratory mill, with equivalent diameter of 0.35 microns, were reactive enough to compensate the low green densification bellow 50 vol%. Polymerization tests realized indicated that the incidence of the laser with fluency of 170 mW.s/mm2 promoted the curing of the 0.5 mm diameter pieces in depth about 0.5 mm, which allowed the prototyping of the scaffolds with sufficient mechanical strength for handling.Capítulo IPEN-doc 22707 Evaluation of biomimetic coatings on femtosecond laser treated alumina and alumina-zirconia composite surfaces2016 - AGUIAR, A.A.; LIMA, N.B. de; BRAGA, F.J.C.; ROSSI, W.; COUTO, A.A.; BALDAN, R.The effect of texturing Al2O3 and Al2O3/ZrO2 surfaces using fem- 7 tosecond laser has been evaluated in terms of the roughness, wettability and 8 microstructure of the substrate to increase growth efficiency and adhesion of 9 hydroxyapatite. Femtosecond laser treatment of these materials causes phase 10 transformation from alpha-alumina to gamma-alumina. Heat effects during fem- 11 tosecond laser treatment causes the grains to be in the nanometer scale. Without 12 heat effects, the grains are in the micrometer scale. The use of femtosecond laser 13 permits control of the surface roughness of the alumina specimens. The higher the 14 femtosecond laser energy, the higher is the wettability of the specimen and the total 15 surface energy. Specimens with laser textured surfaces upon immersion in 1.5 SBF 16 for 6 and 15 days revealed apatite layers well bonded to the substrate and without 17 detachment. The adhesion of apatite to surfaces of specimens that were not textured 18 with femtosecond laser was inadequateArtigo IPEN-doc 22522 Artigo IPEN-doc 20512 Dispersed hydroxyapatite and modified bioglass 45S5 composites: sintering behavior of glass matrix ranging from 20 to 30 wt% in calcium oxide investigation2014 - SILVA, A.C.; PARRA-SILVA, J.; SANTOS, S.C.; SETZ, L.F.G.; MELLO CASTANHO, S.R.H.; BRAGA, F.J.C.Capítulo IPEN-doc 16806 Preparo das cerâmicas de cálcio e fosforo2010 - BRAGA, FRANCISCO J.C.Resumo IPEN-doc 10027 Estudo comparativo entre hidroxiapatitas de origem animal e sintetica enxertadas em seios paranasais2004 - BRAGA, F.J.C.; ROGERO, S.O.; YOSHIMOTO, M.; ALLEGRINI JUNIOR, S.; KUONIG JUNIOR, B.Resumo IPEN-doc 18130 Compósitos de hidroxiapatita óssea bovina disperso em biovidro2011 - SALGADO, L.; BRAGA, F.J.C.Resumo IPEN-doc 19831 Biomaterials compositos: hidroxiapatita sintética dispersa em fosfato de cálcio amorfo2013 - SILVA, A.C.; APARECIDA, A.H.; MELLO CASTANHO, S.R.H.; BRAGA, F.J.C.Resumo IPEN-doc 13353 Matriz vitrea com baixo teor de silicio para enxertia ossea2008 - BRAGA, F.J.C.; LIMA, N.B.; SALVADOR, V.L.R.; ROGERO, S.O.; MEIRA, C.R.Resumo IPEN-doc 13958 A comparative study among, compression ring test compression disc test and flexural test from sic doped yag samples2007 - BRAGA, F.J.C.; LIMA, N.B.; SALVADOR, V.L.R.; KONIG JUNIOR, B.
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