Effects of strontium in modified biomaterials

Area of Science:

• Biomaterials Science
• Bone Biology
• Materials Chemistry

Background:

• Strontium (Sr) is known to influence bone remodeling by stimulating bone formation and reducing resorption.
• Modifying biomaterials with strontium is a strategy to enhance bioactivity and biocompatibility.
• The specific effects of strontium substitution require individual investigation for different material types.

Purpose of the Study:

• To investigate the impact of strontium substitution on the physico-chemical properties and biological performance of hydroxyapatite (Sr-HA), calcium silicate (Sr-CS), and borosilicate (Sr-BS).
• To understand how strontium content affects material degradation and osteoblast responses.
• To identify optimal strontium dosages for biomaterial applications in bone regeneration.

Main Methods:

• Synthesis and characterization of strontium-substituted hydroxyapatite (Sr-HA), calcium silicate (Sr-CS), and borosilicate (Sr-BS).
• Assessment of material solubility and degradation rates in relevant biological environments.
• Evaluation of the effects of released strontium on osteoblast proliferation and alkaline phosphatase activity.

Main Results:

• Strontium substitution did not induce phase transitions in the studied materials.
• Sr-HA exhibited increased solubility, while Sr-CS showed no significant change in degradation rate.
• Sr-BS demonstrated inhibited degradation, and released strontium modulated osteoblast activity, indicating an optimal dose-dependent effect.

Conclusions:

• Strontium substitution significantly alters the physico-chemical properties and biological behavior of HA, CS, and BS biomaterials.
• The effects of strontium are material-specific, influencing degradation and bioactivity differently.
• Understanding these variations is key for advancing the design of strontium-containing biomaterials for bone regeneration.