The three types of saline-filled breast implants are as follows:

• One type is a single lumen implant that is filled during the operation with a fixed volume of saline through a valve. There are no adjustments of the saline volume after the operation.

• A second type is a single lumen implant that is filled during the operation with saline through a valve. This type of implant allows for adjustments of the saline volume after the operation.

• A third type is a single lumen implant that is prefilled by the manufacturer with a fixed volume of saline. There are no valves for filling during the operation or for adjustments of the saline volume after the operation.

The silicone rubber shell for a saline-filled breast implant has the following general composition:

• cured polymeric (large) silicones

• approximately 20% of finely powdered silica th