In vivo bioactivity of titanium and fluorinated apatite coatings for orthopaedic implants: a vibrational study
2003; Elsevier BV; Volume: 651-653; Linguagem: Inglês
10.1016/s0022-2860(02)00662-2
ISSN1872-8014
AutoresPaola Taddei, Anna Tinti, Matteo Reggiani, Patrizia Monti, C. Fagnano,
Tópico(s)Dental materials and restorations
ResumoThe bone integration of implants is a complex process which depends on chemical composition and surface morphology. To accelerate osteointegration, metal implants are coated with porous metal or apatites which have been reported to increase mineralisation, improving prosthesis fixation. To study the influence of composition and morphology on the in vivo bioactivity, titanium screws coated by Plasma Flame Spraying (PFS) with titanium or fluorinated apatite (K690) were implanted in sheep tibia and femur for 10 weeks and studied by micro-Raman and IR spectroscopy. The same techniques, together with thermogravimetry, were used for characterising the pre-coating K690 powder. Contrary to the manufacturer report, the K690 pre-coating revealed to be composed of a partially fluorinated apatite containing impurities of Ca(OH)2 and CaCO3. By effect of PFS, the impurities were decomposed and the crystallinity degree of the coating was found to decrease. The vibrational spectra recorded on the implanted screws revealed the presence of newly formed bone; for the K690-coated screws at least, a high level of osteointegration was evidenced.
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