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).