Injectable polydimethylsiloxane microfiller coated with zwitterionic polymer for enhanced biocompatibility.

Area of Science:

• Biomaterials Science
• Medical Device Engineering
• Tissue Engineering

Background:

• Silicone-based fillers are widely used in medicine for soft tissue augmentation due to their stability.
• Hydrophobic silicone surfaces can trigger adverse biological responses, including excessive fibrosis and foreign body reactions.
• Developing surface modification strategies is crucial to improve the biocompatibility of silicone medical devices.

Purpose of the Study:

• To evaluate a zwitterionic copolymer as a surface treatment for silicone-based fillers.
• To assess the effectiveness and safety of zwitterion-coated silicone fillers in a preclinical model.
• To investigate the potential of this surface modification to mitigate adverse tissue responses to silicone implants.

Main Methods:

• A zwitterionic copolymer with amphiphilic properties was synthesized to functionalize and stabilize silicone particles.
• The zwitterion-coated silicone fillers underwent preclinical evaluation.
• Histological analysis of peri-implant tissues was performed to score foreign body reactions and fibrosis.

Main Results:

• Zwitterion-coated silicone fillers demonstrated inhibition of protein adsorption on their surfaces.
• The modified silicone fillers significantly attenuated the foreign body reaction in a rat model.
• Histological scoring indicated reduced peri-implant fibrosis compared to unmodified silicone.

Conclusions:

• Zwitterionic copolymer surface treatment offers a facile method to enhance the biocompatibility of silicone fillers.
• The developed zwitterion-coated silicone fillers show potential for reducing adverse tissue reactions, such as fibrosis.
• This surface modification strategy holds promise for broader applications of silicone-based materials in various medical fields.