Breast augmentation -425cc "filled to" 550cc. I'm confused on what it means to "fill" the breasts to a different size?

Thank you for your question.  Silicone gel implants cannot be filled.  They come in 1 particular size for each size range.  Saline implants on the other hand can be filled with saline.  Usually saline implants are filled with 50 cc or more to overfill the implant in an attempt to avoid visible rippling of the saline implant.

When you refer to saline implants, the implants come empty and can be overfilled to a larger size. So a 450 saline implant can be overfilled to 500 cc's.  In fact this is commonly done and the manufacturer even says it's okay.  If you are using silicone, 450 cc's is 450 cc's and the size cannot be altered.  Hope this clears things up.

Those patients had saline implants placed.  With a saline implant the surgeon "fills" the implant the day of surgery out of an IV bag as compared to silicone implants which come prefilled from the factory.  We typically will overfill saline implants a little to help prevent rippling which can sometimes happen easier in this type of implant than with a silicone filled on.  Does that help?