Should I Get 400 Cc's or 425 Cc's Considering Im Changing the Implant Type from a Flat One to a More Protrude One As Well?

Upsizing after previous augmentation, especially years later, is not too uncommon. The size difference you are speaking about is really not all that great. In my experience, unless you go up at least 100cc you may not feel as though you got enough "bang for your buck". Ultimately it also comes down to what your body and tissues can tolerate, as well as your goals. Your tissues have stretched to accommodate the present implant so what would have sounded like a large implant in the beginning will not "behave" so large the second time around. The profile, or projection of the implant, as you have spoken about, is also very important. Discuss all of these things with your surgeon.

The difference between 400 and 425 is maybe a couple of millimeters... it's so tiny you can't tell once they are in.  When my patients ask for an exchange and want to go bigger, I recommend a 75-100cc increase to see a noticeable increase in size.  Best thing for you would be to see your plastic surgeon and have him/her show you your existing implant (sample) and your new implant choice size by size to get an idea of how much of an increase you're getting.

Sincerely,

Martin Jugenburg, MD

Toronto Cosmetic Surgery Institute

   25 cc is not a difference that is perceptible.  75 cc is not a huge change either.  Increasing the profile with that volume change may only increase the projection about 1/2 an inch to 1 inch depending upon starting profile and the profile you are selecting now.  Kenneth Hughes, MD Los Angeles, CA