FRANCISCO JOSE CORREA BRAGA

FRANCISCO JOSE CORREA BRAGA

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Direct manufacture of hydroxyapatite scaffolds using blue laser
2015 - 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.
Effects of femtosecond laser irradiation on the surfaces of alumina and alumina-zirconia composites
2012 - AGUIAR, A.A.; LIMA, N.B.; ROSSI, W. de; SAMAD, R.E.; VIEIRA, N.D.; BRAGA, F.J.C.
Dispersed hydroxyapatite bioglass 45S5 composites: comparative evaluation of the use of bovine bone and synthetic hydroxyapatite
2012 - SILVA, S.C.; APARECIDA, A.H.; BRAGA, F.J.C.
Cytotoxicity test for bioceramics of calcium phosphate
1999 - ROGERO, S.O.; BRAGA, F.J.C.; HIGA, O.Z.