Are Natrelle Inspira and Mentor Memory Gel Both Gummy Bear Silicone?

Both brands are made of cohesive silicone gel. This gummy bear type of silicone stays intact if ruptured. Silicone implants aren't lifetime devices but they don't have a defined lifespan either. Some think its ten years but this is not true. It lasts as long as you don't have a problem with them!

This is a common area of confusion for patients researching their options for breast augmentation surgery. It does not help that even some Plastic Surgeon websites perpetuate the confusion. Both Mentor and Allergan offer a family of silicone gel breast implant devices with different features. Cohesive silicone gel implants are available from both companies but only a few should be described as having a  "gummy bear" consistency.

Most of us are familiar with the look and feel of Gummy Bear candies. These popular treats have a firm feel, maintain their shape and would seldom be described as soft or  "gooey". The equal in the silicone gel breast  implant world are those implants  that are "form-stable" and are referred by Plastic Surgeons to be  third generation silicone gel implants. Allergan's family of implants includes the anatomically shaped Natrelle 410 and a round  form-stable Inspira silicone gel implant. Mentor has a shaped form-stable implant known as the CPG.   In Canada, we have had most of  these form-stable, highly cohesive silicone gel and third generation  implants available for breast augmentation surgery since 2002.

The Mentor "Memory Gel" and Allergan "Natrelle" round implants available in North America are considered second generation silicone gel implants. The gel filler used  is more cohesive than older first generation implants which has lowered the rupture rates and reduced the risk of silicone gel leaching outside of the capsule of scar tissue that forms around all implants. These implants have become very popular compared to saline filled implants and have an excellent satisfaction rate. 

Long term studies show that third generation or  form-stable implants (Gummy Bears) have an overall reduced incidence of revisional surgery compared to less cohesive gel filled second generation implants. Unfortunately for patients in the United States, the FDA as not yet approved these third generation implants for elective breast augmentation. They are however approved for reconstructive breast surgery. 

Having more choices as a Plastic Surgeon in Canada, has improved my ability to select implants that match the unique  features and goals of my patients. Until these additional choices are available in the US, we should use all try to use  the term "gummy bear" only with form-stable silicone gel  breast implants and the original chewy and tasty candy!

Dr. Mosher

All silicone breast implants are made with polydimethylsiloxane molecules cross-linked to each other. The fewer crosslinks, the more liquid (oily) the silicone is, and more crosslinking yields more and more cohesive silicone gels. The present fifth generation of silicone gel implants (Memory Gel by Mentor, or Natrelle by Allergan) are both cohesive gels that do not leak or exhibit "silicone bleed" from the implant shell beyond microscopic molecular amounts that are substantially less than in previous generations of silicone gel implants (these were the ones that could rupture, leak, or stimulate inflammatory reaction and capsular contracture.) The present implants were engineered by both implant manufacturers to address and deal with these issues, and are much more cohesive than previous versions.

The "gummy bear" implant is an even more cohesive (more crosslinking), form-stable, teardrop-shaped, textured-surface implant that has been used in several studies that are hoped to lead to FDA approval. They are not yet available to the general population or plastic surgeons outside these studies (which I believe are presently closed). There are pros and cons to these implants that your surgeon can discuss.

At this point in time, both the Mentor Memory Gel and Allergan Natrelle silicone gel implants represent the best FDA-approved implants available, and are comprised of a soft but cohesive gel that does not ooze or leak if these implants are cut or punctured. They are NOT, however, as firm and form-stable as the shaped "gummy bear" study implants that have not yet received FDA approval.

No implant (or any implantable device) is guaranteed to "last a lifetime." However, silicone gel breast implants do not "wear out," nor do they automatically need replacement after any set period of time. The present generation of cohesive silicone gel implants will likely outlast your own anatomic changes or desire for different size or position, which are the most common reasons for re-operation,  NOT implant "failure!"

This is certainly a point of confusion for many patients.  Highly cohesive silicone gel implants are what are referred to as "gummy bear" breast implants because the silicone polymers in these implants have greater cross-linking, which allows them to be form-stable such that if they are cut in half there will be two separate halves like a gummy bear candy.  The older silicone gels had more of a liquid consistency and would spill out when cut, which led to the development of cohesive silicone gel implants followed by highly cohesive silicone gel (gummy bear) breast implants.  
Since your question in 2011, Allergan (Natrelle), Mentor, and Sientra have each received FDA approval and released their version of highly cohesive silicone gel (gummy bear) breast implants in the United States.  Inspira is the name of Allergan's Natrelle round implant with a higher silicone fill percentage.  Inspira now comes in "Responsive" (cohesive but not highly cohesive), "Cohesive" (most form-stable highly cohesive), and most recently "Soft-Touch" (highly cohesive but less form-stable than the "Cohesive").  The greater the cohesivity, the less the deformability and chance of visible rippling.  The quality of implants continues to improve with new advancements every few years.  Most implant companies recommend changing the implants every 10 years, but this does not need to be done if you are not having any problems with your implants.
Ziyad Hammoudeh, MD

This is a topic that is often confusing for patients.  Both the Inspira and Memory Gel implants are considered second generation implants (not gummy bear).  The Inspira is filled with the same gel as the regular Natrelle implants, except that the fill ratio is higher meaning that they have a "fuller" appearance.  These implants are different than the Allergan 410 implant, which is a 3rd generation implant with highly cohesive gel.  This is the "gummy bear" implant that many people refer to.  The 410 implant now comes in two different shapes, anatomic or round.  The silicone on these 410 implants will literally stay in its form even if the implant is cut in half.  My personal opining is that there is no reason to replace an implant if it is not ruptured and there is no capsular contracture.  I would recommend a consultation with a Board Certified Plastic Surgeon who has experience working with a variety of implants to see what you may be a candidate for.  Best of luck!