Revision breast augmentation or enlargement surgery is an operation in which the previosuly operated breasts are improved in appearance by correcting asymmetry, unfavorable scarring, or making changes to the shape or size of the previoslu placed breast implants. It really is a breast augmentation repair. The implants may be saline or silicone. The implant is also known as a mammary prosthesis. It typically takes from one half hour to one and a half hours to place the breast device, depending on such things as pocket location, incision, and the type of implant used.