Today’s silicone implants last longer than saline implants. After 2006, all silicone implants in the United States are some degree of semisolid as opposed to liquid silicone, therefore, if they rupture, they don’t leak.
A plastic surgeon in Newport Beach, California has a video on YouTube showing him driving over both a saline and silicone implant with his personal BMW sedan. The saline implant breaks and the silicone implant does not.
The real problem with saline implants is the valve. Since saline implants are filled at the time of surgery, they have a self-sealing valve. These valves from all manufacturers tend to fail over time. Also, the body tends to send scar tissue down the valve. This scar tissue goes down the valve leading to a slow leak of the saline out of the implant.
Therefore, the reason for saline implants not lasting as long as silicone implants is because saline implants rupture more easily, and they tend to leak from the fill valve over time.
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