Saline implants are essentially made of a silicone “shell” that has a valve much like a balloon through which sterile saline or salt solution is injected after the implant is in place. They can be filled with different quantities of saline which can impact the shape, suppleness and feel of the breast. If the implant happens to leak, which is rare, the saline will be harmlessly absorbed by the body since it is essentially the same composition as the water in your body. If this happens, the implant can be replaced immediately.
Silicone or “gel” implants are made of the same silicone “shell” but are pre-filled with a silicone gel solution which is an elastic semi-solid material. Silicone gel implants do not have a valve and cannot be adjusted. Silicone gel implants are more pliable and feel more like natural breast tissue compared to saline implants. A leaking silicone implant may not collapse. Because the gel is a solid, it will generally stay confined inside the shell and does not “flow” out like a liquid. You should see your cosmetic surgeon regularly to ensure the implants remain intact. An ultrasound or MRI screening can examine the condition of implants breast augmentation and the time frame of such check-ups may vary.
Implants not only come in different sizes, but also can have different shapes such as "round" or "tear-drop" and can have different “profiles.” The profile of the implant determines its height or projection relative to its width. Your surgeon can recommend the best shape and profile for you based on your anatomy and your measurements.
Implant suppliers or inventors occasionally introduce brand-new designs and types of implants, so there may be extra options available, so be sure to ask your surgeon if this is the case.