I have 700 cc expander. After I reach 700cc, how much more can safely be put in the expander?

You can safely add over 50% the rated volume in an expander, however at 700 cc, you options for gel implants are usually limited to 800 cc so no sense in going much higher than this.  If you plan on saline implant reconstruction, you can go much higher. 

Thanks for your question, Mrsbuckie,As the other answers here address, you can over-expand the tissue expander but there may not be good reason to do so.  As the expanders are filled, the shape and size change fairly dramatically, even if the external shape seems to change slowly.  Once an implant is filled near its capacity, the implant does not expand as fully (the surface area does not change as quickly), and instead it becomes more round, hard, and often uncomfortable.  Since the tissues aren't being expanded as effectively, and most gel implants are not available above this point, it's rare that I would need to continue to expand.  Also remember the old adage, bigger implants=bigger problems (stretched tissues, sagging, rippling, etc).  Hope this helps! Best regards,--Erik Hoy, M.D.

The two stage expander/implant recon allows the opportunity of gradual expansion of the breast. You can easily expand beyond the 700cc, however the largest gel implant is 800cc!   

can easily be 'overfilled' but as Dr. Thomassen notes, the implants to replace the expander don't go over 800 cc's so when you consider the fill and the size of your port, you're nearly there and really don't need anymore filling.  If you have access to custom implants that will exceed 800 cc's, then you can continue to expand.

I have specialized in XL breast implants for many years. I have a special arrangement with a couple of breast tissue expander companies as well as custom XL silicone manufacturer and have offices in California/Miami/Nassau/ANGUILLA AND ITALY. Some of my patients have gone well beyond the size that you wish to be! I woiuld suggest you visit my website specifically for XL patients below.I am available for FACETIME/SKYPE/Whatsup video consultations.