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- W2066462893 abstract "Single-crystal hydroxyapatite and OH-carbonated hydroxyapatite have bending strength much higher than that of dense hydroxyapatite ceramic, indicating potential applicability to a load-bearing biomaterial. However, the effects of carbonate on the strength are less clear. The objective of the present study was to determine the bending strength and Young's modulus of these single crystals with carbonate contents from 0 to 0.62 in CO 2 wt%. Three-point bending tests were performed by means of a modified ultramicrohardness tester with a span of 380 μm and a bending direction <210> of the single crystals. The crystals were broken in air, water, and air after immersion in a cell culture medium for 3 wks. The average Young's modulus of the single crystals was from 54 to 79 GPa. The average bending strength of the single crystals in air was 500 ± 184, 468 ± 205, 513 ± 151, and 450 ± 162 MPa for those with 0, 0.09, 0.37, and 0.62 wt% carbonate, respectively. No significant decrease in strength was found for hydroxyapatite single crystals both in water and after the immersion in the medium. However, the strength of OH-carbonated hydroxyapatite single crystals decreased significantly by 23 to 43% in water in proportion to the carbonate content. The strength of single crystals with 0.37 and 0.62 wt% carbonate decreased significantly, even after the immersion in the medium. Therefore, hydroxyapatite single crystals are superior to OH-carbonated hydroxyapatite single crystals as a biomaterial for a load-bearing purpose." @default.
- W2066462893 created "2016-06-24" @default.
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- W2066462893 date "1998-07-01" @default.
- W2066462893 modified "2023-10-17" @default.
- W2066462893 title "Mechanical Properties of Hydroxyapatite and OH-carbonated Hydroxyapatite Single Crystals" @default.
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- W2066462893 doi "https://doi.org/10.1177/00220345980770071201" @default.
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