| Title | Cellulose phosphates as biomaterials. In vivo biocompatibility studies |
| Publication Type | Journal Article |
| 2002 |
| Authors | Fricain, JC, Granja, PL, Barbosa, MA, De Jéso, B, Barthe, N, Baquey, C |
| Journal | BiomaterialsBiomaterials |
| Volume | 23 |
| Issue | 4 |
| Pagination | 971 - 980 |
| Date Published | 2002/// |
| 01429612 (ISSN) |
| animal experiment, Animal implantation, animal tissue, Animalia, Animals, article, Biocompatibility, Biocompatible Materials, biomaterial, Biomaterials, Bone, bone cell, bone mineralization, Bone Regeneration, Calcium, calcium 45, Calcium Compounds, calcium phosphate, Calcium Radioisotopes, cell adhesion, cell proliferation, Cells, Cellulose, Cellulose phosphate, Chemical modification, controlled study, Dehydration, histology, hydrogel, Hydrogels, implant, in vivo study, Inflammation, materials testing, Microscopy, Electron, Scanning, morphometrics, nonhuman, Oryctolagus cuniculus, Osseointegration, Phosphates, Phosphorylation, priority journal, Prostheses and Implants, rabbit, Rabbits, Regenerated cellulose hydrogels |
| Femoral implantation of regenerated cellulose hydrogels revealed their biocompatibility, but a complete osseointegration could not be observed. Phosphorylation was therefore envisaged as the means to enhance cellulose bioactivity. In vitro studies showed that regenerated cellulose hydrogels promote bone cells attachment and proliferation but do not mineralize in acellular simulated physiological conditions. On the contrary, phosphorylated cellulose has shown an opposite behavior, by inducing the formation of a calcium phosphate layer in simulated physiological conditions, but behaving as a poor substrate for bone cells attachment and proliferation. In order to investigate the in vivo behavior of these materials, and assess the influence of mineralization induction ability vs. bone cells compatibility, unmodified and phosphorylated cellulose hydrogels were implanted in rabbits for a maximum period of 6 months and bone regeneration was investigated. Despite the difficulties arising from the retraction of cellulose hydrogels upon dehydration during the preparation of retrieved implants, histological observations showed no inflammatory response after implantation, with bone intra-spongious regeneration of cells and the integration of the unmodified as well as the phosphorylated cellulose implants. After a maximum implantation period of 6 months, histological observations, histomorphometry and the measurement of the amount of 45Ca incorporated in the surrounding tissue indicated a slightly better osseointegration of phosphorylated cellulose, although no significant differences between the two materials were found. © 2001 Elsevier Science Ltd. All rights reserved.
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