Silicone implants that are cohesive can ooze out of the implant shell if ruptured The gummy bears do not.
The new highly cohesive silicone gel (gummy) implants are first and are not a liquid, thus are extremely safe. I recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with and who is a board-certified Plastic Surgeon certified by the American Board of Plastic Surgery.
Harvard Educated, Beverly Hills & Miami Beach Trained, Double-Board Certified Plastic Surgeon
Yes, this is true. The new gel is like "jello" as opposed to the old gel like "honey," and does not leak through the shell (gel bleed), nor leaks out into the tissue if the bag were to break. This makes these implants safer and have fewer complications than the old gel implants.
This is a characteristic of the new generation of Silicone Gel Cohesive Implants. The Gel is harder, more cohesive and not liquid. So when the capsule of the implant breaks the gel goes out under pressure and as soon as pressure stops the gel goes back and get into the shell again making, as you said, a "mushroom effect".It is completely true, they don't leak.
The new generation of silicone breast implants don't leak out of their shell when ruptured. They're much more stable and tend to maintain their shape and integrity . That's one of the reasons that it's very hard to tell that they've even ruptured without doing special studies like an ultrasound or MRI.