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Fill: Underfill vs. Overfill

Hint: Always Overfill Saline Implants

On this page, Dr. Loftus will walk you through the issue of saline implant fill and why this is important.

Saline breast implants are filled with air when they arrive from the manufacturer. During surgery, your surgeon will evacuate the air and fill each implant to the desired volume of saline. The amount within each implant can be adjusted by 25-30 ml before concluding the procedure. Overfilling to the recommended volume reduces deflation, rippling, and sloshing. Hence, implant manufacturers encourage overfilling. Filling beyond the recommended overfill volume is not usually advocated by the manufacturers, as doing so might increase deflation. Example: if an implant is described as a 300 ml implant, then it should be optimally overfilled to 325 ml (Mentor) or 330 ml (Allergan). If an implant is described as a 300-325 ml implant, it should be optimally overfilled to 325 ml.


Implants that are not filled to the recommended minimum capacity have a higher risk of deflation than those filled to their recommended maximum capacity (overfill volume). Their edges fold repeatedly and weaken, just as a piece of paper that is folded along the same line repeatedly will tear easily. That is why implant manufacturers recommend that implants be filled to the recommended maximum fill volume, also called the "overfill" volume.

Rippling and Sloshing

If you have a waterbed, you may have noticed that the amount of water in the mattress alters its degree of rippling and sloshing. The same is true for saline breast implants. Both effects can be reduced by overfilling the implants.


There are multiple advantages to overfilling, and no disadvantages.

Dr. Loftus

About Dr. Loftus

Dr. Loftus is a female plastic surgeon who is considered a national authority on plastic surgery, having appeared on numerous talk shows as an expert. Her book has become a best-selling book on plastic surgery and has earned her the reputation as a vocal advocate of patient safety, satisfaction, and education in plastic surgery. No wonder her patients have such great things to say about her…
Dr. Loftus standing by staff
My results are amazing - Dr. Loftus is amazing!
My friends can't believe how natural I look!
I had no pain after surgery and recovery was so easy.
The entire experience was fabulous!
I am a nurse who has worked with many doctors, Dr. Loftus is the best!
The care was exceptional and results are incredible!
My results are better than I ever imagined!
Dr. Loftus is a rare surgeon: highly skilled, personable and compassionate!
My experience from start to finish was completely extraordinary!
Awesome results from a skilled and caring doctor.
I love love love Dr. Loftus and everyone in the office!
I've never felt so comfortable and understood in a doctor's office.
I felt so comfortable and barely had any pain at all.
I never knew I could look this good! Thank you Dr. Loftus!!!
Never met such a warm and caring staff anywhere else.
If only every doctor could be like Dr. Loftus, how very fortunate we would be.

Dr. Loftus
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Dr. Loftus
on The Today Show

Dr. Loftus

Dr. Loftus
on Later Today

Dr. Loftus
on Later Today

Dr. Loftus
on CNN

Cincinnati: The Christ Hospital 2139 Auburn Avenue, Suite 201
Cincinnati, OH 45219
(513) 793-4000
5 minutes from downtown Cincinnati,
At the Christ Medical Office Building

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Northern Kentucky 1881 Dixie Highway, Suite 300
Fort Wright, KY 41011
3 minutes from downtown Cincinnati &
visible from I-71/75

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