Grain boundary corrosion in TiO2 bone scaffolds doped with group II cations

last updated: 2019-01-11
ProjectNORTE45_3Bs - RL1 :: publications list
TitleGrain boundary corrosion in TiO2 bone scaffolds doped with group II cations
Publication TypePapers in Scientific Journals
Year of Publication2018
AuthorsKlemm A., Gómez-Florit M., Carvalho P. A., Wachendörfer M., Gomes M. E., Haugen H. J., and Tiainen H.
Abstract

A pH drop during the inflammatory phase during bone regeneration can cause corrosion in TiO2 bone scaffolds and the loss of compressive strength. Corrosion as ion leaching and dissolution is confined to grain boundaries. Cationic doping of TiO2 showed to increase the compressive strength but increased the amount of impurities in grain boundaries as well. Therefore, this study showed the different grain boundary formation for Ca, Sr and Mg doped scaffolds and their corrosion behavior. After corrosion, the amorphous phase in grain boundaries was dissolved in all doped scaffolds. Differences occurred due to the formation of an additional crystalline phase in Sr doped scaffolds. The presence of an amorphous and crystalline phase led to an inhomogeneous dissolution in grain boundaries and a significant decrease in compressive strength already after 4 h in contact with an acidic environment. Released ions did not show any cytotoxic effect on hASCs. Mg doped TiO2 scaffolds led to sig- nificant increased osteogenic differentiation.

JournalJournal Of The European Ceramic Society
Date Published2018-12-24
PublisherElsevier
ISSN0955-2219
DOI10.1016/j.jeurceramsoc.2018.12.055
URLhttps://www.sciencedirect.com/science/article/pii/S095522191830774X
KeywordsCorrosion, Doped TiO2, Grain boundary, osteogenic differentiation, SrTiO3
RightsembargoedAccess (6 Months)
Peer reviewedyes
Statuspublished

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