Mentor Memory Gel Silicone Implants Vs Sientra HIGHLY Cohesive Form-stable Gummy Bear Implants?

I have been researching on silicone implants available. The information I found has not been consistent. How many different types silicone implants are there in terms of cohesive vs. liquid gel vs. form-stable? I know there are 3 companies making the products, just wondering how many types of silicone being use in terms of components and characteristics.

Doctor Answers 16

The Difference Between Breast Augmentation Implants

This is an interesting question. There are a lot of people who are confused about this. I am glad that you’re doing your research however, since it indicates that you are a proactive healthcare consumer who understands that some thought should be given to a decision about what is the best for your body.
There are 3 companies that make and market breast implants in the US. They are Mentor (owned by Johnson and Johnson), Natrelle (owned by Allergan) and Sientra. Mentor and Natrelle offer saline filled implants, as well as silicone gel filled breast implants that are filled with a relatively cohesive gel but they are not so cohesive as to be form stable. Both companies offer these implants in a variety of sizes and projections and both offer smooth as well as textured shells. All three companies offer a third implant type; a form stable cohesive gel filled implant. Mentor’s form stable implant is textured and os called MemoryShape™. Similarly Natrelle has a form stable implant that is textured called the Natrelle® 410 Highly Cohesive Anatomically Shaped Silicone-Filled Breast Implant. Sientra does not offer a saline implant and all of their breast implants are form stable. They have smooth and textured implants that are round and shaped as well as textured and smooth implants.
The three breast implant companies offer very similar products but the there are differences you should be aware of:
  • Sientra offers a 2 year warrantee for capsule contracture. This is important since capsule contracture is the biggest concern that most patients and surgeons have with breast augmentation. If you develop this problem in the first two years Sientra will replace your implants.
  • Sientra has a little flatter back making the edges harder to feel and therefore a little more natural feel.
  • Sientra has a documented lower capsule contracture rate.
  • Sientra has a documented lower rupture rate.
  • Sientra is only available to board certified plastic surgeons.
While the other companies have provided excellent products for years, Sientra has come to the breast augmentation market place and literally changed the game. It is currently the only implant I recommend to my new breast augmentation patients since, for the reasons mentioned above, it is the only implant I would recommend to a member of my family.
I hope that helps.
Best regards.


Kirkland Plastic Surgeon
4.9 out of 5 stars 46 reviews

Sientra gel implants vs Mentor and Allergan

The history behind gel implants is long but the US experience recently has 3 different companies that make implants. These companies are Mentor, Allergan and Sientra. All offer FDA approved silicone gel implants that are safe and well made.
Mentor and Allergan offer a gel implant that has been available in the US for the last 20 years. They also now offer a new form stable implant that is shaped and highly cohesive and were approved by the FDA last year.
Sientra is newer to the US market but has a long and safe experience in Europe and South America. Sientra offers both a newer round cohesive gel implant and a shaped version of their highly cohesive gel implant. It is the Sientra gel implant types that were first referred to as the "gummy bear" implant. Sientra was the first company to get the shaped implant approved for use in the US.
Sientra breast implants are only available from Board Certified Plastic Surgeons. The marketplace can be confusing with all types of doctors calling themselves cosmetic surgeons and even plastic surgeons. One way to know you are being treated by a board certified plastic surgeon is to ask for Sientra breast implants.
As far as the types of implants the companies offer: Mentor and Allergan offer their round silicone implants and their newer shaped (anatomical) implants. Their shaped implants are called Memory Shape by Mentor and Style 410 by Allergan.
Sientra has their round gel implant which is more cohesive (gel sticks together more) than the other companies as well as their shaped gel implants which are a little less firm than the other companies shaped implants. I like the round base shaped silicone implant by Sientra a lot. I use them all however.
I hope this helps you understand what is available in the US market at this time.

Types of Silicone

All manufacturers have two gels and have both round and teardrop implants.

The gel in mentor rounds is called "memory gel" and the gel in mentor teardrop implants is called "memory shape."

The gel in all Allergan round implants is the same and the gel in their teardrop implants (the 410) is more cohesive.  Allergan makes an implant called the Inspira that uses the same gel as the regular implants but more gel is put into any given shell so it ripples less (though outside of the US they make this implant with a more cohesive gel.)

Sienta uses two types of gel: the HSC and HSC+.  It stands for High Strength Cohesive.  The use HSC in round implants, and they have a line of implants (the 105) with a standard degree of fill and a second line with the same gel but a higher degree of file (the 106.)  Unlike the other two, they use the more cohesive HSC+ in a more filled round implants called the 107, and this was released just several weeks ago.

I have used every one of these implants and the differences are subtle but real.  The most cohesive is the 410 followed by MemoryShape, HSC+, HSC, standard Allergan gel, and then standard Mentor Memory Gel.

The less cohesive implants are softest and the more cohesive implants better maintain their shape and tend to ripple less.  The more filled 107 and Inspira also have less of a tendency to ripple than their less filled counterparts.  It is a question of dimensions, trade-offs, and a patient's own breasts and desires.

Steven Teitelbaum, MD
Los Angeles Plastic Surgeon
4.8 out of 5 stars 43 reviews

Shaped form stable breast implants

Shaped-form stable breasts implants are implants that are designed with a lower point of maximal projection, and they are designed with what is considered an anatomic shape. In some patients they provide a more natural appearing breast augmentation result. This is a shaped form-stable implant. They come in a wide variety of sizes and shapes. This one is a little bit taller than it is wide. It has a fairly low point of maximal projection, and it’s an intermediate projection implant. Are shaped form-stable implants the best device for every patient? Well, no. If you have a breast that’s already full in the lower pole and somewhat elongated, you will get a perfectly good result with a round implant in most cases. However, if you have a very small starting breast volume (A or small B), and especially if you need to have the inframammary fold lowered to achieve an ideal implant position on the chest wall then shaped form-stable implants provide a lot of advantages. 

Michael Law, MD
Raleigh-Durham Plastic Surgeon
4.8 out of 5 stars 109 reviews

Mentor Memory Gel Silicone Implants Vs Sientra HIGHLY Cohesive Form-stable Gummy Bear Implants?

Thank you for the question. All currently FDA approved silicone gel breast implants are “cohesive”.  This “cohesiveness” makes it so that the silicone material is less likely to leak, if/when there is a failure of the surrounding shell. The “gummy bear” silicone material is a  more dense material chemically.  The term “gummy bear”  has been  used, almost as a slang term,  to encompass all silicone gel breast implants; thus the confusion. None  of the types of breast implants you mention are necessarily “better”; there are pros/cons associated with each type of implant.  Every patient who presents for breast augmentation surgery has a different body type, different goals/concerns, and potentially a different “mindset” when it comes to the best breast implant for her. It is, therefore very important to individualize each patient's care.

Sientra implants offer certain advantages over Mentor®.

Both Mentor's MemoryShape™ implant and Sientra's breast implants are form stable, meaning they are firmer and anatomically-shaped for the most natural looking results. Either implant type can create beautiful results, but many surgeons and patients prefer Sientra implants due to a few advantages they offer. For one, Sientra implants come with a 2-year warranty providing free implant replacement to any patient who develops a grade 3 or 4 capsular contracture during the first 2 years following breast augmentation. Secondly, with five different anatomically-shaped implants to choose from, Sientra offers a wider variety of form stable implant options than either Mentor or Natrelle. Finally, Sientra implants have a lower documented rupture rate than competitors and are only available to board certified plastic surgeons, making them the new gold standard for form stable implants. As always, it's best to discuss your implant options with your breast augmentation surgeon

Mentor Memory Gel ilicone Implants Vs Sientra Highly Cohesive Form-stable Gummy Bear Implants?

Due to various brand names and lay terms, it can be confusing as to the differences and similarities between the three major  manufacturers of silicone breast implants available in the U.S.  (Natrelle-Allergan, Mentor-Johnson & Johnson, and Sientra-Silimed.)  All companies offer highly cohesive silicone implants which resists leakage as compared to the older style liquid silicone implants.  Some of these implnats have greater cross linking of the silicone and tend to be more form-stable than others (more Gummy Bear-like).  Of the various implants the Allergan style 410 implants tend to be the most form stable (firm) in shape.  This can be an advantage or disadvantage depending on the patient and situation.  In cases of breast reconstruction following mastectomy many surgeons prefer the Allergan 410 implants for their shape holding characteristics but this same situation may be a disadvantage in a breast augmentation in a thinner patient with soft tissues.  Ask your surgeon what implant they would suggest in your particular case and why.  Best wishes, Dr. Lepore.     

Vincent D. Lepore, MD
San Jose Plastic Surgeon
4.9 out of 5 stars 47 reviews

Breast implant options

There are 3 breast implant manufacturers in the US.  Sientra was FDA approved in the US in 2011 though has been in the International market for over 30 years under the name Silimed.  Sientra has the most cohesive or form stable implant on the market and was the first to have their anatomically shaped implant approved by the FDA.  They also ONLY sell to Board Certified Plastic Surgeons, which essentially means they have received the most extensive, inclusive training available and have had to perform a substantial number of plastic surgery procedures. When visiting your plastic surgeon, he should have the implants available for you to see and feel.  You can feel the difference between the different implants.  Sientra has a wide variety of shapes, contours, profiles and textures and is a great implant!

Sientra Form Stable Implants: Best Choice?

In 2014, each of the main companies (Sientra, Mentor, Allergan) is producing high quality silicone implants.  However, Sientra's form-stable implants represent the latest generation of silicone and are often referred to as 'gummy bear' implants due to their stability.  While each of the companies' implants can yield an excellent result it is important to know that Sientra only provides implants to Board Certified plastic surgeons, a detail that can prevent you from being treated by someone without that important qualification.

Types of silicone implants

We use and have used all three companies: Mentor, Allergan and Sientra.  You can get an excellent result with any of them.  One advantage to Sientra is that they are only sold to Board-certified Plastic Surgeons, so if your surgeon offers Sientra, then by definition he or she has met the bar of being a board-certified plastic surgeon.  

The final choice is between you and your surgeon, depending on your chest width, height, weight and desired improvement.  Forget cup size, as it is unreliable. Have a discussion with a board-certified plastic surgeon, look at many before and afters together and rely on your surgeon for the final choice (with your input , of course)

Best of luck
Dr Canales

Heather J. Furnas, MD
Santa Rosa Plastic Surgeon
4.8 out of 5 stars 28 reviews

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.