The mechanical and chemical stability of the interfaces in bioactive materials: The substrate-bioactive surface layer and hydroxyapatite-bioactive surface layer interfaces

• DOI: 10.1016/j.msec.2020.111238
• Publication Date: 2020-06-25T06:07:55Z
• Authors: S. Ferraris; S. Yamaguchi; N. Barbani; C. Cristallini; G. Gautier di Con...; J. Barberi; M. Cazzola; M. Miola; E. Vernè; S. Spriano
• Keywords: Bioactive Glass; Surface Modification; Chemical Stability; Simulated body fluid

Bioactive materials should maintain their properties during implantation and for long time in contact with physiological fluids tissues. In the present research, five different bioactive (a glass four chemically treated titanium surfaces) have been studied compared terms of mechanical stability surface layer-substrate interface, term bioactivity, type hydroxyapatite matured hydroxyapatite-surface layer interface. Numerous physical chemical analyses (such as Raman spectroscopy, macro micro scratch tests, soaking SBF, Field Emission Scanning Electron Microscopy equipped Energy Dispersive Spectroscopy (SEM-EDS), zeta potential measurements Fourier Transformed Infra-Red spectroscopy (FTIR) imaging) were used. Scratch evidenced differences among metallic surfaces concerning All surfaces, despite kinetics are covered by a bone like carbonate-hydroxyapatite B-type substitution after 28 days SBF. However, apatite is not same all materials: dissolution occurs at pH around 4 (close to inflammation condition) more pronounced way faster bioactivity together detachment layer. A protocol characterization here suggested predict implant-bone interface stability.