Had 350 HP Gel Mentor Implants a Year and Half Ago. Contemplating Getting Revision to 450CC HP Gel Mentors

It's not unusual for patients to come back and wish that they had gone larger once everything has settled from their initial surgery.  My dad, who was also a plastic surgeon, used to tell me that a cup size was about 150-200 cc's.  That was a pretty decent rule of thumb, however, every patient is different.  Most of my patients want to be a full C or small D cup.  Using my dad's rule of thumb, another 100 cc's would probably put you in that range.

What I would tell my patient is that you have to be happy with your result. If you constantly think that you need to be bigger than it is taking up too much of your active thoughts and you just need to go ahead and do it. 100 cc for a 5'6" woman is not an extraordinary leap in size. You may need to change the profile of your implant to a High Profile implant so that the implant is not too wide for your chest. There are always risks involved but nothing out of the ordinary.

Some times the evil of good is better. Going up only 100 cc will change you about 1/2 a cup size.  If this is important to you then consider the change otherwise be happy with your result. 

If you look great and are happy why go bigger?  Certainly you can if you really want, but every surgery carries some risk.

Most women want to look a natural as possible after undergoing breast augmentation.  In order to achieve this look you need adequate amount of soft tissue (skin, fat, breast) to cover the implant.  If you currently look great with saline implants then you may not look very natural going to 450cc saline implants.  Silicone gel implants are kinder to the look as you go larger but you don't want to outstrip your body's ability to cover the implants.  Your surgeon can help with your decision.