In vitro studies of calcium phosphate silicate bone cements

Area of Science:

• Biomaterials Science
• Nanotechnology
• Bioceramics

Background:

• Calcium phosphate silicate bone cement (CPSC) is a novel biomaterial.
• It is synthesized through an in situ nanocomposite formation process.
• The cement comprises tricalcium silicate (C3S) and calcium phosphate monobasic (CPM).

Purpose of the Study:

• To synthesize and characterize a novel CPSC.
• To evaluate the biocompatibility and bioactivity of CPSC.
• To assess its potential as a biomedical cement.

Main Methods:

• In situ synthesis of CPSC involving C3S hydration and CPM reaction with calcium hydroxide (CH).
• Biocompatibility testing using cell cultures.
• Characterization using X-ray diffraction (XRD) and scanning electron microscopy (SEM).
• In vitro bioactivity assessment via immersion in simulated body fluid (SBF).

Main Results:

• CPSC formation involves in situ precipitation of hydroxyapatite (HAP) within calcium silicate hydrate (C-S-H) gel.
• The synthesis process largely removes CH, enhancing biocompatibility.
• Cell culture tests confirmed improved biocompatibility of CPSC compared to pure C3S.
• XRD and SEM showed HAP layer formation on CPSC after 7 days in SBF, indicating in vitro bioactivity.

Conclusions:

• CPSC exhibits enhanced biocompatibility and bioactivity due to in situ HAP formation and reduced CH content.
• The material demonstrates low/no cytotoxicity.
• CPSC is a promising candidate for biomedical cement applications.