Plastic has two meanings: 1 plastic; Made of plastic.

The dictionary of plastic surgery has a direct explanation: medical surgery to repair or replace damaged skin or improve people's face or body appearance.

Just like cosmetic surgery, there is a direct explanation in the dictionary: cosmetic surgery.

If we must say why, I think it's probably because in the early cosmetic surgery, most of the implants used were plastic or some materials similar to plastic, unlike many polymer materials now.

In fact, many foreigners use words only as a matter of habit. I have read many articles about plastic surgery, but I have not clearly pointed out why it is called. There should be no special story, and some words are more of an understanding.