Reaction to silicone implants in the guinea pig

Area of Science:

• Biomaterials Science
• Plastic Surgery Research
• Immunology

Background:

• Extensive research exists on the biological response to silicone implants.
• Previous studies indicate varying degrees of tissue reaction around these devices.

Purpose of the Study:

• To investigate the presence and characteristics of silicone material within capsules surrounding silicone implants.
• To correlate silicone presence with inflammatory responses and capsule changes in experimental models and human tissues.

Main Methods:

• Analysis of human silicone implants and guinea pig implants (solid silicone, saline-filled, and gel-filled sacs).
• Microscopic examination of capsules for vacuoles, amorphous material, and inflammatory cell infiltration.
• Assessment of silicone fluid loss from intact silicone sacs and solid silicone discs under mechanical stress.

Main Results:

• Silicone fluid loss observed from intact human silicone gel implants and solid silicone discs.
• Vacuoles or amorphous material, identified as silicone, found within capsules surrounding implants in guinea pigs.
• Capsule thickening and inflammatory reactions were associated with the presence of silicone material.

Conclusions:

• Silicone material can migrate from implants, leading to its presence within surrounding capsules.
• The accumulation of silicone within capsules correlates with inflammatory responses and capsule thickening.
• This silicone-associated foreign body reaction may contribute to the firmness experienced by patients post-breast augmentation.