What is the variance of silicone vs saline implant? Saline implant, also known as the salt water breast implant, has been in use for quite some time before that. In contrast to saline implants, silicone implants are the second option for women who want to enhance their breasts. Silicone gel has no known human allergies, sensitivities, or reactions. All women over 18 can get saline-filled breast implants.