The recommended fill levels for all saline filled breast implants are determined by the manufacturer. For example Allergan Natrelle saline style LP-350 implant is a 350cc implant with a suggested fill range of 350cc to 370. It would be possible to fill this implant to 375cc's. These fill sizes are not absolute. Some doctors overfill implants to achieve a desired result.
All saline breast implants have a recommended manufacturers fill range. The general rule is that implants can be filled to 10% above the that range. As you fill an implant beyond these recommendations, you can experience scaffolding along the edge similar to rippling. You never want to under fill an implant. This will increase the rippling and deflation rates.