How Much Can Saline Implants Be Overfilled?

That look is best achieved with high profile implants filled to the upper end of their volume range.  It sounds like you have moderate profile implants, which are too wide and flat for the look you are trying to achieve.  I would not overfill a 450 to 700.

                  The
manufacturers of breast implants produce implants that have fill ranges which
are designed to give surgeons latitude in the operating room. These implants
allow adjustments in volume which can help deal with problems such as
asymmetry. These guidelines generally allow implants to have an additional 15%
of volume. Excessive overfill can result in device failure and resultant
deflation. It would be inappropriate to inflate a 450cc implant to 700cc and
this would probably result in implant failure.

                  Since
you had your surgery six months ago, your result won’t change without further
intervention. Your post-operative pictures suggest significant breast sag and
this appears to be your primary problem. This is the origin of your lack of
upper breast fullness. Correction of your breast sag represents the best
solution to your current problem. With a breast lift you might not need new
implants, but this could be accomplished easily in combination with breast lift
if it were necessary.

                  It’s
important that you discuss this issue with your surgeon, so an appropriate
treatment plan can be formulated. If you still have concerns a second opinion
may be necessary. 

Saline implants have a range with which they can be filled. A minimum fill and a maximum fill which varies depending on the implant size.  You can safely overfill an implant above its maximum fill volume by 10 - 15 %. Beyond that, the risk of deformation of the implant edge is high resulting in the look of implant rippling.

Many plastic surgeons routinely overfill saline implants to about 10% of their labeled volume.  There is a range on each implant that the manufacturer has for that particular implant.  The actual fill is up to the surgeon trying to achive the goals that you set out upon to achieve.  In your case, there are a few variables at play  Achieving the significant upper pole fullness that you have in the first photo may be difficult, depending on your skin resilience, how much extra skin you may have, etc.  One would have to examine you to determine this.  Typically one would also remove and replace the implant if you are going significantly larger, again that is for your plastic surgeon to determine.

Hi there-

Based on your photos and the goal you describe, I would think your chances of achieving success are much higher with a new, larger implant.

However, my opinion is that the real problem with the shape of your breasts, and the reason you have not achieved the outcome you desire, is that your breast lift outcome could be a lot better.

Correcting your current breast outcome to the shape and size you want requires a higher level of understanding of breast surgery and implant dynamics...

If your current surgeon is not able to confidently provide you options for achieving your goals, I would recommend you find a surgeon with a great deal of experience and a reputation for excellence in breast surgery and visit for an opinion- these problems can become more difficult to correct after multiple procedures (not to mention that you would probably like to achieve your goal after as few operations as possible).

Overfilling implants by up to 20 % is no problem and lowers the wrinkles and rippling that can occur if it's underfilled.
I once filled a 400cc implant to 2000cc in my office (not in a patient!) just to see what would happen. It became round, hard, and very tight !
If it's increased upper pole fullness you want, I would opt for raising the implant up higher in the breast to get rid of the "bottomed out" look, and using an implant shape that gives you the best projection. Just going bigger is a poor remedy.

Overfilling implants can be done to various extents.  I believe the manufacture's suggested fill volumes should be respected in all cases.  Saline breast implants will have a minimum and maximum suggested fill volume.  The implants are guaranteed and under warrenty if these guidelines are followed.  Overfilling beyond the maximum recommended volume will void the warrenty and should not be done. 
If you want larger implants it is best to choose an implant with a larger base or a higher profile.  However, you need to stay within the base width of your breast or the implant will be too large for your body type.  The largest implant I would ever suggest is a "high profile" implant which falls within the base width of your breast. 

Many surgeons routinely overfill an implant by about 10%. So doing the math, you can overfill a 450 filled to 525 by about 52.5 cc that would come to a total of 577.5. As you can see this is far from 700cc. While your implants are capable of being filled to 700cc, it is not advised and you may have a difficult time convincing a surgeon to do this. Be prepared to sign some waivers.

Each saline implant is different in its ability to be overfilled.  There is always an overfill allowance with each implant, which may range from 25cc to 100cc, depending on the implant.  However, you can overfill the implants past those numbers and still be within the warranty. 
A 450cc implant can probably get to around 600cc, but after that, it will be pretty firm.  If you want to be in that 700cc range, I would go with a 550cc or 600cc saline implant and overfill it.  You could get the 450cc implant to 700cc, but I wouldn't recommend it. 

The size stated for saline implants is the minimal fill volume, and there is an acceptable range of 25-50 cc above that. At the lower end of the range, the implants are softer but tend to ripple more; at the high end, they will be rounder, firmer, and not very natural feeling. In your case, what I see in the pictures is bottoming out, not lack of volume. Larger implants such as you would have by filling to 700 cc will only contribute to making that problem worse because of the additional weight. I would wager that there are very few plastic surgeons who would even consider filling 450 implants to 700 anyway. Additional support such as you would get with the internal bra technique using Strattice is likely to be a better long-term solution.