Effect of CaF2 on densification and properties of hydroxyapatite-zirconia composites for biomedical applications |
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Authors: | Kim Hae-Won Noh Yoon-Jung Koh Young-Hag Kim Hyoun-Ee Kim Hyun-Man |
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Affiliation: | School of Materials Science and Engineering, Seoul National University, South Korea. |
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Abstract: | Hydroxyapatite (HA) composites with zirconia (ZrO2) up to 40 vol% were fabricated with the addition of CaF2. The sinterability of the composites was found to be enhanced markedly by the addition of small amounts of CaF2 (< 5 vol%). Decomposition of HA to beta-TCP was suppressed due to the substitution of F- for OH-, consequently forming fluor-hydroxyapatite (FHA) solid solution. This suppression of decomposition allowed the production of a fully dense body, which retained both high flexural strength and fracture toughness. The osteoblast-like cell (MG63) response to these F- ion-containing composites displayed comparable cell viability to pure-HA by in vitro proliferation test. |
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