I had 485cc anatomical shaped Mentor implant. Will I be able to redo it again using round silicone? (Photo)

Ok, here's the deal. Your old breasts were droopy and low. You had also features of a "constricted" breast, which in your case is a short distance from the inferior mammary  crease to the nipple. Your surgeon put your implant low and used a shaped implant in order to give the bottom of the breast projection, so you didn't need a lift. And it pretty much worked, except you have a slight ridge and I assume you want to look bigger and higher. My huge advice is to leave it the hell alone. I think the ridge may go away, as the ridge is the old inframammary crease and these things have a "memory" as we say. If you swap to round now the ridge won't ever go away and 700cc is too large unless you are a stripper. Think about it.

I would wait 6-12 months . You could do a round gel implant but will need a breast lift.  You have significant protsis and needed a lift done at your first surgery as seen in your pictures.   Round implants will give you a nice result.  Go to a board certified plastic surgeon.  Good luckAndrew Cohen MD