期刊
SURFACE & COATINGS TECHNOLOGY
卷 319, 期 -, 页码 191-199出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.04.012
关键词
Poly(etheretherlcetone); Calcium phosphate; Hydroxyapatite; Strontium; Pulsed electron deposition; Osteoporosis
资金
- Fondazione del Monte di Bologna e Ravenna, Italy [455bis/2014]
Herein the preparation of Sr2+-doped calcium phosphate (CaP) coatings on poly(etheretherketone) (PEEK) substrates by pulsed electron deposition (PED) was investigated. Hydroxyapatites (HA) substituted with tailored amounts of Sr2+ up to 9 wt% were synthesized to generate the deposition targets. Dense and uniform amorphous CaP films having Sr/Ca molar ratios close to that of targets were achieved. The roughness and the wettability of the bare PEEK were significantly enhanced after coating deposition. The presence of Sr2+ led to a slight increase of the particles size while it did not mainly affect the RMS of the coatings that consisted of nanostructured aggregates of globular shape. After a mild annealing treatment at 130 degrees C for 6 h, the amorphous coatings transformed into nanocrystalline HA films incorporating sr(2+) having Sr/Ca molar ratios close to those of the as-deposited films. The annealing did not affect the topography and the roughness of the coatings, while improved the hardness of the films un-doped and doped at low-extent. This study shows that PED is feasible technique to coat PEEK implants with CaP films with control over the Sr/Ca ratio, which could improve bone fixation and in vivo stability especially under osteoporotic conditions thanks to the anabolic effect of Sr2+. (C) 2017 Elsevier B.V. All rights reserved.
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