FWIW, and I’m only mentioning this because of the phrasing of the question, plastic surgery isn’t named after ‘plastic’ (the noun), but for ‘plastic’ (the verb). Plastic surgery was used as a term decades before plastic (the noun) was even invented!

But anyway, to answer your question, people tend not to use silicone in implants so much nowadays, preferring saline instead (as another person said). The main reason is that it is much less problematic if there is a rupture.

Leaking silicone is not immediately dangerous, but does need to be removed - which is difficult as it can squidge about and under other tissues, causing mischief as it goes. Saline, by comparison, will just get absorbed by the body, usually harmlessly.