Implant shape

When a tooth is loose or damaged, an implant

It helps, doesn't it?

I'm curious about the shape of molar implants.

Molars are used for chewing more than others.

You do it a lot.

The surface of the touching part is smooth and glossy.

Is it a form?

Or is it shaped like this with a groove?

Are the top and bottom shapes different?

What precautions should I take when getting a molar implant?

I'm also curious about the duration.