Cementos biomédicos de fosfato tricálcico reforzados con silicatos y aluminatos de calcio-preparación, caracterización y estudios de biodegradación

Abstract

The combination of in situ self-setting and biocompatibility makes calcium phosphate cements highly promising materials for a wide range of clinical applications. However, its low strength limits its use to only non-stress applications. α-Tricalcium phosphate (α-TCP) cement sets into calcium-deficient hydroxyapatite (CDHA), which is a biocompatible compound and can induce osteointegration. β-Dicalcium silicate (β-C2S) and tricalcium aluminate (C3A) are Portland cement components, these compounds react with water to form hydrated phases that enhance mechanical strength of the end products. In this investigation, were prepared α-TCP cements modified with β-C2S and C3A. α-TCP powder was prepared through acid-base method, β-C2S and C 3A were synthesized by sol-gel method. Materials were characterized chemical and physically. Biodegradability was studied by soaking the materials in simulated body fluid (SBF) at 37°C for 7 days. All cements exhibited long setting times and excellent setting temperature. T (100% α-TCP) and TS10 (10%-β-C2S) were converted to CDHA after 7 days soaking in SBF and their compressive strength were comparable to that of trabecular bone. TA10 (10%-C3A) was only partly converted to CDHA and showed the lowest compressive strength. © 2013 Springer.