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Effects of silica addition on the chemical, mechanical and biological properties of a new α-tricalcium phosphate/tricalcium silicate cement

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Effects of silica addition on the chemical, mechanical and biological properties of a new α-tricalcium phosphate/tricalcium silicate cement

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Título Effects of silica addition on the chemical, mechanical and biological properties of a new α-tricalcium phosphate/tricalcium silicate cement
Autor Morejón Alonso, Loreley
García Carrodeguas, Raúl
Santos, Luis Alberto dos
Abstract The addition of tricalcium silicate (C3S) to apatite cements results in an increase of bioactivity and improvement in the mechanical properties. However, adding large amounts raises the local pH at early stages, which retards the precipitation of hydroxyapatite and produces a loss of mechanical strength. The introduction of Pozzolanic materials in cement pastes could be an effective way to reduces basicity and enhance their mechanical resistance; thus, the effect of adding silica on the chemical, mechanical and biological properties of α-tricalcium phosphate/C3S cement was studied. Adding silica produces a reduction in the early pH and a decrease in setting times; nevertheless, the presence of more calcium silicate hydrate (C-S-H) delays the growth of hydroxyapatite crystals and consequently, reduces early compressive strength. The new formulations show a good bioactivity, but higher cytotoxicity than traditional cements and additions higher than 2.5% of SiO2 cause a lack of mechanical strength and an elevated degradability.
Contido em Materials research : ibero-american journal of materials. São Carlos, SP. Vol. 14, no. 4 (Oct./Dec. 2011), p. 475-482
Assunto Cimento de fosfato de cálcio
Hidroxiapatita
Silicato de cálcio
[en] Calcium phosphate cements
[en] Hydroxyapatite
[en] Pozzolan
[en] Tricalcium silicate
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/75871
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