What is the difference between the GUMMY BEAR breast implant and SILICONE memory gel implants?

Memory gel and gummy bear both refer to the same class of newer generation silicone gel breast implants.  They offer a stiffer version of gel that helps to keep the form of the implant, with less effect by gravity.  Memory gel is associated with a brand of implants (Mentor), while similar Allergan implants are called 410s.  There are slight differences in the firmness of the implants between the two brands, but are meant to perform the same role. "Gummy bear" is more of a generic term, as is "cohesive gel", and "form stable" implants.  The newest generation of silicone gel implants are much stiffer than those in use 30 years ago, and the implant shell (the outer material) is also thicker as well.  You can learn more about the difference during an in person consultation.  Please seek a plastic surgeon certified by The American Board of Plastic Surgery.

Cohesive gel?…Form stable?...Gummy Bear?…Memory Gel? What do these terms have in common? With the recent introduction and FDA approval of the next generation of devices, the attention of patients, physicians and the media has been focused on these terms. While these devices have certainly captured the public’s attention, an in-depth understanding continues to evade most.
Following the FDA moratorium on the use of silicone gel filled breast in 1992, “cohesive gel implants” were introduced to the market. How do these devices differ from their predecessors? The silicone gel of a cohesive gel implant is firmer (via the addition of proprietary cross-linker). The greater the cross-linking the firmer the device will feel. The result is a filling that doesn’t leak when the shell is compromised in the way that a traditional liquid does. This quality is best illustrated when cutting a device in half…it doesn’t yield a gooey mess but instead two stable halves.

Generally speaking today’s silicone implants are all “cohesive gel implants” to some extent.This broad term has been inappropriately applied to the next generation of “highly cohesive gel implants.” However, the recent media attention on “cohesive gel implants” is not warranted and is in fact misplaced.

These newest devices to reach the market are form stable implants.  These higher strength silicone gel implants were approved by the FDA in March 2012. They contain a more “highly cohesive gel.” This increase confers upon these devices the ability to maintain shape irrespective of position. This quality has earned them the informal nickname of “Gummy Bear” implants. Imagine cutting into a gummy bear candy and the effect is the same.

While these implants are new, “novelty” does not necessarily equal “better.” There is a device for every patient. Form stable implants have both advantages/disadvantages. The advantages are: shape retention, no shell folding/wrinkling, no leakage, decreased capsular contracture. The disadvantages include: increased cost, limitations related to access incision, increased technical difficulty, and potential for device rotation. Additionally, the texturing which has been employed to address potential device rotation has now been associated with BIA-ALCL.
There are currently 3 devices with FDA approval available to the public at large which fall into what could be broadly described as the "Gummy Bear" category. They are the Allergan/Inamed 410, Mentor Memory Shape, Sientra. Each represents a different point along the cohesive gel spectrum, the former being the firmest and the latter the softest.
With regards to your specific question, MemoryGel is a term Mentor has coined for their cohesive gel implants. As I described above "Gummy Bear" is a term which has been loosely applied to a number of different devices but most accurately describes the form stable devices (highly cohesive). 
In general, traditional round silicone implants are preferred over saline implants by many patients and surgeons for their more natural feel. These devices are also more commonly employed in the cosmetic setting relative to the form stable devices. However, as you can see from the offerings described above, there are a myriad of options available to patients.Patients are encouraged to have an in-depth consultation with their board certified plastic surgeon before selecting a particular type of implant. While form stable anatomic implants are newer, they may not be suitable for all patients. 

Hello, "gummy bear" means different things to different people.  Some people use this term to describe teardrop-shaped silicone gel implants, but others use this term to describe any silicone gel implant (round or teardrop) with highly cohesive thick gel inside.

Hello! A ‘gummy bear’ implant is so called because when it is cut in half, the material (usually silicone) inside the implant remains intact, and keeps its shape - much like a gummy bear. ‘Memory Gel’ is the trademarked brand name for an implant range containing cohesive gel, which is a thickened gelatine-like silicone, somewhere between a liquid and a solid. Your surgeon will be able to discuss which type of implant will be best suited to you, and will also be able to advise on his or her experience with each – for example, what specific feedback patients with these implants have given. 

MemoryGel is a term used by Mentor for their newer silicone gel implants. Gummy bear really refers to the shaped, tear drop silicone implants offered by both Mentor and Allergan. The problem is that they (gummies) are all textured. There is a new concern with textured implants causing a rare form of lymphoma called BIA-ALCL. I have always used smooth implants for various reasons, but this is a new reason to use smooth. Sientra makes a great implant and is my preference. Good luck!

Dr Salzman's response posted here on RS is excellent answer. I prefer Mentor but use both Allergen and Mentor gels.

All modern silicone breast implants are filled with polymerized silicone that is properly described as a gel (as opposed to a liquid).  All three US FDA approved manufacturers (Mentor, McGhan, and Silimed) have their own propriety gels, and some manufacturers (notably McGhan) offer different types of gels within their different implant styles.All gels can be described as Gummy Bear or Cohesive; some thicker gels are better termed Form Stable or Memory gel.  These more polymerized gels are typically found in shaped implants and in super-projecting implants (to protect against rippling).The best results derive from solving four equations of balance: top to bottom; left to right; skin vs. volume, and implant dimension vs. breast dimension.  Be sure to consult with a surgeon certified by the American Board of Plastic Surgery who has familiarity with all types of implants and who can show you a comprehensive portfolio of pre- and post-op pictures.

The memory gel name for silicone gel implants is used by the Mentor Corporation to describe their cohesive silicone gel implants. The term gummy bear means different things to different people. It's usually intended to mean that the consistency of the implant feels more like the structure of a gummy bear candy. In my experience, this usually is more related to the feel of an Allergan 410 shaped silicone gel implant. I see online, however, that people use the term gummy bear to describe all cohesive silicone gel implants of all brands. Hope that's helpful.