Many of us older people are familiar with the word "dentures" because many of our parents hand them. And at that time, dental implants were not available technology, so those dentures were "removable."
Nowadays, however, dentures---partial or full---can in fact be "fixed" and are frequently cemented to implants.
Here's a link you might look at: www.ncbi.nlm.nih.gov/pubmed/21119130