Structure degradation and strength changes of sintered calcium phosphate bone scaffolds with different phase structures during simulated biodegradation in vitro
Language English Country Netherlands Media print-electronic
Document type Journal Article
PubMed
30948091
DOI
10.1016/j.msec.2019.03.027
PII: S0928-4931(18)33971-7
Knihovny.cz E-resources
- Keywords
- Calcium phosphate, Cell response, Compressive strength, Degradation, Phase composition, Scaffold,
- MeSH
- Cell Adhesion MeSH
- DNA metabolism MeSH
- Calcium Phosphates chemistry MeSH
- Ceramics chemistry MeSH
- Hydrogen-Ion Concentration MeSH
- Bone and Bones physiology MeSH
- Humans MeSH
- Mesenchymal Stem Cells cytology MeSH
- Compressive Strength MeSH
- Porosity MeSH
- Tissue Scaffolds chemistry MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- DNA MeSH
- Calcium Phosphates MeSH
The structure degradation and strength changes of calcium phosphate scaffolds after long-term exposure to an acidic environment simulating the osteoclastic activity were determined and compared. Sintered calcium phosphate scaffolds with different phase structures were prepared with a similar cellular pore structure and an open porosity of over 80%. Due to microstructural features the biphasic calcium phosphate (BCP) scaffolds had a higher compressive strength of 1.7 MPa compared with the hydroxyapatite (HA) and β-tricalcium phosphate (TCP) scaffolds, which exhibited a similar strength of 1.2 MPa. After exposure to an acidic buffer solution of pH = 5.5, the strength of the HA scaffolds did not change over 14 days. On the other hand, the strength of the TCP scaffolds decreased steeply in the first 2 days and reached a negligible value of 0.09 MPa after 14 days. The strength of the BCP scaffolds showed a steady decrease with a reasonable value of 0.5 MPa after 14 days. The mass loss, phase composition and microstructural changes of the scaffolds during degradation in the acidic environment were investigated and a mechanism of scaffold degradation was proposed. The BCP scaffold showed the best cell response in the in vitro tests. The BCP scaffold structure with the highly soluble phase (α-TCP) embedded in a less soluble matrix (β-TCP/HA) exhibited a controllable degradation with a suitable strength stability and with beneficial biological behavior it represented the preferred calcium phosphate structure for a resorbable bone scaffold.
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