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Mechanical Properties and In Vitro Bioactivity of Ca 5 (PO 4 ) 2 SiO 4
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Pure Ca
5
(PO
4
)
2
SiO
4
bioceramic was first prepared by a sol–gel method using triethyl phosphate, tetraethoxysilane, and calcium nitrate tetrahydrate as original materials. Simulated body fluid (SBF) immersion tests revealed that Ca
5
(PO
4
)
2
SiO
4
samples had a greater in vitro apatite-forming ability than hydroxyapatite (HA). After soaking Ca
5
(PO
4
)
2
SiO
4
samples in the SBF for 1 day, bone-like apatite precipitated on the surfaces and the apatite layer became thicker with increasing the soaking time. However, few bone-like apatites precipitated on the HA samples even after soaking in the SBF for 7 days. The good in vitro bioactivity of Ca
5
(PO
4
)
2
SiO
4
samples was attributed to the silanol (Si-OH) groups and greater solubility of Ca
5
(PO
4
)
2
SiO
4
. In addition, hot-pressed Ca
5
(PO
4
)
2
SiO
4
ceramic exhibited lower bending strength and elastic modulus than hot-pressed HA, since the former had a lower relative density than the latter. The results have shown that Ca
5
(PO
4
)
2
SiO
4
is a potential candidate material for bone repair.
SAGE Publications
Title: Mechanical Properties and
In Vitro
Bioactivity of Ca
5
(PO
4
)
2
SiO
4
Description:
Pure Ca
5
(PO
4
)
2
SiO
4
bioceramic was first prepared by a sol–gel method using triethyl phosphate, tetraethoxysilane, and calcium nitrate tetrahydrate as original materials.
Simulated body fluid (SBF) immersion tests revealed that Ca
5
(PO
4
)
2
SiO
4
samples had a greater in vitro apatite-forming ability than hydroxyapatite (HA).
After soaking Ca
5
(PO
4
)
2
SiO
4
samples in the SBF for 1 day, bone-like apatite precipitated on the surfaces and the apatite layer became thicker with increasing the soaking time.
However, few bone-like apatites precipitated on the HA samples even after soaking in the SBF for 7 days.
The good in vitro bioactivity of Ca
5
(PO
4
)
2
SiO
4
samples was attributed to the silanol (Si-OH) groups and greater solubility of Ca
5
(PO
4
)
2
SiO
4
.
In addition, hot-pressed Ca
5
(PO
4
)
2
SiO
4
ceramic exhibited lower bending strength and elastic modulus than hot-pressed HA, since the former had a lower relative density than the latter.
The results have shown that Ca
5
(PO
4
)
2
SiO
4
is a potential candidate material for bone repair.
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