The operative word is "safely"

kiokie,

This question really depends on your definition of "safely."  In terms of risks of the implant material to your health, they are the same for all implant sizes, so the largest available implant (800cc) can be used "safely".  In terms of risks to your tissues, breast sensation, breast feeding ability, implant complications, etc., the larger the implants, the greater the risk.  So, the idea of "safely" depends on your tolerance of complications before YOU determine that the procedure is unsafe. 

Silicone gel implants are less projecting than saline implants.  This may account for your 500cc gel implants seeming smaller than your 375cc saline.

To kiokie,

Hi!  You could have 500 cc to 700 cc implants put in (depending on your anatomy) and you would get away with it. But I really don't recommend this.  Huge implants don't look natural, they have more problems (for example, increased risk of loss of nipple sensation), and they don't age well.  If a woman insists on implants that are too big for her, I will not operate on her.

1)  The final decision on implant size should only be made DURING SURGERY, not in advance. ( Of course I must understand what you want and we make a tentative choice before surgery.)  We put the operating table into a sitting position (you are under anesthesia, of course) and we place temporary implant SIZERS into the implant pockets.

  Then we try different amounts of saline inside the sizers until we find the largest size  that looks natural.  This takes the guesswork out.  Then we select the corresponding silicone implant and the sizer is discarded.

2)  A silicone implant will look about 50cc smaller than a saline implant of the same size.

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The largest implant available is an 800 cc implant.  There used to be custom implants available but I believe they are not available anymore.  The same size implant can be put behind the muscle as under the gland.  The shapes now are all different so it definitely effects projection and base width of the implant.

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