Silicone cc's vs Saline cc's.. are they equal?

The very short answer is "yes".  Saline and silicone are equivalent in that cubic centimeters of saline and cubic centimeters of silicone are exactly the same volume.  The configuration of the two breast implants are different, and this will have some impact on bra size.  However, the volume increase was only about 180 ccs.  In a woman with a 32 bra, 180 ccs equals one cup size.  If you have a 36 size bra, one cup would equat 240-260 ccs.  Therefore, there is no way you could have increased your bra size by two cups no matter what size band width you have.Also, teardrop breast implants rarely fill out any given cup whereas high profile breast implants tend to fill up a cup, therefore it is possible to wear the same bra before and after your surgery, and just have a different amount of fill of that same bra.

Great question, the short answer is not exactly. Saline cc's indicate the amount of saline placed inside the implants but does not take in account the volume of the shell. Silicone cc's represents the actual volume of the implant - gel and silicone together. 

The difference between the given volume of a saline implant vs a silicone implant with that same given volume is essentially the same.

Thank you for your question.  The cc size of silicone vs saline implants is not exactly the same but close.  The cc's in a saline implant refer to the amount of cc's of saline added to the implant but do not account for the volume of the implant shell.  The cc's of a gel implant refer to the total volume of the implant including the shell.  The shell even if the total volumes of the two were exactly the same there would still be a difference in appearance due to the different properties of gel and saline.  Having said that I would question why you thought that going from 270 to 450, a 180 cc difference would give you a 2 cup size increase in size.  If your surgeon told that it would then you were mislead as a 180 cc increase in most patients would at most be about one cup size.

A two cup size increase is too much to expect from the implant exchange you had. The switch from saline to silicone and to a higher profile implant likely account for your noticing little change in size.