There are many different types of breast implants available in the United States. Only two companies, Mentor Corp. and Allergan, have received FDA approval for their implants.
Implants come in a variety of shapes, sizes, textures. There are silicone, saline, smooth breast implants, textured breast implants, round breast implants, anatomical breast implants. There are various "profiles", such as moderate profile, high profile, and low profile breast implants. You will want to familiarize yourself with the options available so that you can get an idea of what type of implant you want.
Some surgeons have a preference for a certain type of breast implant, such as smooth round breast implants, for example. Other surgeons don't have a particular preference. You should know the advantages and disadvantages to all of the breast implants currently available. This knowledge will allow you to ask more educated questions at your consult, as well as help you to decide which particular breast implant is right for you.
PIP Breast Implant Specifications (PIP implants are obsolete)
Nagor Breast Implant Specifications (not available in the US)
Eurosilicone Breast Implant Specifications (not available in the US)