# Bioceramics Based on Li-Modified Bioactive Glasses for Bone Tissue Regeneration

## TL;DR

This study develops lithium-modified bioceramics that show promise as bioresorbable bone substitutes with good mechanical and biological properties.

## Contribution

The novel use of lithium in bioglass-ceramics enhances resorbability, mechanical strength, and antimicrobial activity for bone tissue engineering.

## Key findings

- Lithium incorporation led to improved densification and compressive strength with higher sintering temperatures.
- In vitro tests showed increased resorbability and moderate antimicrobial activity with higher lithium content.
- Cell viability assays confirmed the cytocompatibility of the lithium-modified bioceramics.

## Abstract

The development of effective bone substitutes remains a central goal in regenerative medicine. In this study, lithium-modified bioglass-ceramics based on the 47.5S5 silicate oxide system were synthesized using the sol–gel method, followed by calcination and axial pressing to form cylindrical samples. These materials were sintered at 700 and 800 °C and subsequently examined to evaluate their structural, mechanical, and biological performance. Structural and microstructural analyses confirmed the presence of crystalline phases such as combeite (Na6Ca3Si6O18), NaLiSiO4, Li2SiO3, and calcium silicates, indicating the successful incorporation of lithium within the glass-ceramic network. The bioceramics exhibited improved densification, deformability, and compressive strength with increasing sintering temperature. In vitro degradation in simulated body fluid revealed a consistent increase in mass loss with higher lithium content, suggesting enhanced resorbability linked to lithium oxide. Antibacterial testing indicated moderate antimicrobial activity, with slightly better results observed at higher sintering temperatures. Cell viability assays further supported the materials cytocompatibility. Taken together, these findings suggest that lithium substitution contributes positively to both mechanical robustness and biological behaviour, positioning these ceramics as promising bioresorbable bone substitutes with controlled degradation, suitable for bone tissue engineering where durability, bioactivity, and antimicrobial function are required.