Preparation of Laser-Modified Ti-15Mo Surfaces With Multiphase Calcium Phosphate Coatings

Abstract

Multiphasic bioceramic scaffolds has been enhanced for dental and orthopedic applications. In this perspective, the laser surface texturing of metallic surfaces combined to bioactive calcium phosphate coatings have shown to be promising and economically feasible for biomaterial clinical applications. Ti-15Mo alloy samples were irradiated by pulsed Yb: YAG laser beam. The formation of HA and other calcium phosphates phases by biomimetic method should occur in the presence of Ca 2+ , PO 4 3-, Mg 2+ , HCO 3-, K + and Na +. The modified surfaces were submitted to thermal treatment at 380 and 580°C. The results showed the processes of fusion and fast solidification from the laser beam irradiation, inducing the formation of stoichiometric α-Ti, TiO 2 and non-stoichiometric titanium oxides, Ti 3 O and Ti 6 O with different oxide percentages depending on applied fluency (fluency of 0.023, 0.033, 0.040 and 0.048 J/mm 2). The morphological and physicochemical properties have indicated the formation of a multiphase bioceramic coatings. It was observed the formation of amorphous calcium phosphate (ACP), octacalcium phosphate (OCP), and magnesium phosphate (Mg 3 (PO 4) 2) phases at 380°C, whereas β-TCP (tricalcium phosphate), OCP, and substituted β-TCP with Ca 2,589 Mg 0,41 (PO 4) 2 were obtained at 580°C. Therefore, the multiphasic bioceramic modified Ti-15Mo surface could enhance osteointegration for bone regeneration.

Behavior of rat bone marrow stem cells on titanium surfaces modified by laser-beam and deposition of calcium phosphate

“…Similar findings were observed by Bini et al [ 15 ] and Filho et al [ 16 ] after laser irradiation on cpTi surface, Oliveira et al [ 12 , 41 ], Guastaldi et al [ 40 ] and Pires et al [ 13 ] after laser irradiation on Ti-15Mo alloy surface and Queiroz et al [ 18 ] after laser irradiation and HA deposition on cpTi surface. In addition, using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) analysis, it has already been shown the phases and the chemical composition of titanium samples (cpTi and Ti-15Mo) after laser surface modification and deposition of calcium phosphates using the same methodology described in this manuscript (Bini et al [ 15 ]; Filho et al [ 16 ]; Santos et al [ 42 – 44 ]).…”