An injectable bioactive poly(γ-glutamic acid) modified magnesium phosphate bone cement for bone regeneration

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Materials Chemistry

Background:

• Magnesium phosphate bone cements (MPC) are promising alternatives to calcium phosphate bone cements.
• However, rapid setting, high hydration temperature, and alkaline pH limit their clinical use.
• Developing modified MPC is crucial for enhanced bone regeneration applications.

Purpose of the Study:

• To develop novel poly(γ-glutamic acid) (γ-PGA) modified magnesium phosphate bone cements (MPC).
• To investigate the effects of γ-PGA content on MPC properties and performance.
• To evaluate the potential of modified MPC for bone repair and regeneration.

Main Methods:

• Synthesis of γ-PGA modified MPC with varying γ-PGA content.
• Assessment of injectability, anti-washout ability, setting times, and hydration temperature.
• Evaluation of mechanical compressive strength, in vitro bioactivity, degradation, and cyto-compatibility using MC3T3-E1 cells.

Main Results:

• The 10%PGA-MPC exhibited improved handling characteristics and reduced hydration temperature.
• Enhanced mechanical compressive strength and good in vitro bioactivity were observed.
• The modified MPC demonstrated excellent cyto-compatibility with MC3T3-E1 cells.

Conclusions:

• γ-PGA modification effectively addresses the limitations of traditional MPC.
• 10%PGA-MPC demonstrates superior performance and safety profiles for bone regeneration.
• This novel biomaterial holds significant potential for orthopedic applications.