I have my metal bridge removed today. My gum was and still is swollen and inflamed underneath. I want to replace it with something that does not contain any metal. The dentist suggested Zirconium.

Zirconium is a metal. He probably meant zirconium dioxide. Specialist language mentions Zirconium frame on the one hand, and metal free replacements on the other hand, describing the same thing.

Is it entirely ceramic or metal covered by ceramic? Does it cause metallic irritation or not?

Is it possible to produce the whole bridge out of plastic?