β-Dicalcium silicate-based cement: synthesis, characterization and in vitro bioactivity and biocompatibility studies

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Bioceramics

Background:

• Beta-dicalcium silicate (β-Ca₂ SiO₄, β-C₂ S) is a key component in Portland cement and refractories.
• It acts as a hydraulic cement, forming strength-providing hydrated calcium silicate (C-S-H) phases upon reaction with water.

Purpose of the Study:

• To synthesize pure β-C₂ S powder using a sol-gel process at low temperatures.
• To evaluate the in vitro bioactivity and biocompatibility of a cement (CSiC) derived from this β-C₂ S powder.

Main Methods:

• Sol-gel synthesis of β-C₂ S powder.
• Preparation of CSiC cement from the synthesized powder.
• In vitro immersion of CSiC in simulated body fluid (SBF) to assess apatite formation.
• In vitro cytotoxicity testing using human osteoblast cell cultures.

Main Results:

• The sol-gel process successfully produced pure β-C₂ S without chemical stabilizers.
• CSiC cement formed a bone-like apatite layer on its surface after SBF immersion.
• CSiC cement demonstrated compressive strength comparable to human trabecular bone.
• Extracts from CSiC cement showed no cytotoxicity, supporting cell growth and viability.

Conclusions:

• Sol-gel synthesis is a viable method for producing β-C₂ S for cement applications.
• CSiC cement exhibits promising in vitro bioactivity and biocompatibility for potential bone void filling applications.