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The 2 main types of breast implants available for decades have been the saline filled an silicone gel filled breast implants. Each has its pros and cons. Silicone gel implants have a more natural feel and look. Unlike silicone gel, implants containing only saline do not blend well with surrounding tissues at the edges of the implants. This is due to the chemical properties of salt water which is chemically charged as positive and negative charges that attract each other as opposed to silicone gel which does not carry a charge. Thus saline is more cohesive than silicone. What this means in clinical terms is that saline implant margins are more visible than silicone gel implant margins, especially when the soft tissue (breast gland and fat) between the outside world and the implant is thinner. Thus, in those patients with smaller breasts (less glandular tissue and/or fat) it is preferable to place saline implants under the chest muscle.
