Effects of silica addition on the chemical, mechanical and biological properties of a new α-Tricalcium Phosphate/Tricalcium Silicate Cement

Materials Research

Loreley Morejón-alonso²  Raúl García Carrodeguas¹  Luis Alberto Dos Santos² 

[1] ,Universidade Federal do Rio Grande do Sul Escola de Engenharia Departamento de MateriaisPorto Alegre RS ,Brazil

关键词: calcium phosphate cements;    hydroxyapatite;    tricalcium silicate;    pozzolan;   

DOI  :  10.1590/S1516-14392011005000072

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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