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Nanoporosity is known to impact the performance of implants and scaffolds such as bioactive glass (BG) scaffolds, either by providing a higher concentration of bioactive chemical species from enhanced surface area, or due to inherent nanoscale topology, or both. To delineate the role of these two characteristics, BG scaffolds have been fabricated with nearly identical surface area (81 and 83±2 m(2)/g) but significantly different pore size (av. 3.7 and 17.7 nm) by varying both the sintering temperature and the ammonia concentration during the solvent exchange phase of the sol-gel fabrication process. In vitro tests performed with MC3T3-E1 preosteoblast cells on such scaffolds show that initial cell attachment is increased on samples with the smaller nanopore size, providing the first direct evidence of the influence of nanopore topography on cell response to a bioactive structure. Furthermore, in vivo animal tests in New Zealand rabbits (subcutaneous implantation) indicate that nanopores promote colonization and cell penetration into these scaffolds, further demonstrating the favorable effects of nanopores in tissue-engineering-relevant BG scaffolds.

Nanoporosity Significantly Enhances the Biological Performance of Engineered Glass Tissue Scaffolds