Can dentures be refitted for a different person if they have never been used by the original owner? I have several broken teeth, root tips and missing teeth. The remaining teeth are shifting and I continually fight an infection that wont go away even wit

Definitely, no. Dentures are made after taking a custom impression. It fits only that person. The denture sits on the alveolar ridge in your mouth, and everyone's ridge is shaped differently. People also bite down differently and the height at which they bite all the way down is different as well in relation to orthopedic stability. Because of all these factors you can't reuse someone else dentures.
Good question, NO! Honestly, it's hard enough to make a well fitting, functioning and esthetically pleasing and natural full denture to begin with. Trying to adapt one person's denture to fit another person would take more time, energy, frustration and cost than to simple make a new one. Sorry, good idea but it won't work. See a dentist (reduced fee clinic if necessary or dental school clinic) for consult.
No. Everyone's mouth is different. So another person's denture will not fit your mouth. A new denture will be needed for yourself.
Dentures. Dentures are custom made prosthetics fabricated for one specific patient. A denture made for another individual will not fit you and will not be comfortable no matter what. You'll have to pay for your own set of teeth.
It . It the original owners' detures are customized for their mouth through a number of measuring and fitting stages, the dentures are likely to not have a great fit on you. If you wear dentures that don't fit correctly they can cause sores where that rub against your gums. It could also cause pain when you eat or talk.
No. Your mouth is unique and getting fitted with a set of dentures requires impressions of your mouth, measurements of your bite, and trying in the teeth to see if they're right--and all this before the dentures are made for you. If you have problems with continued infection in your mouth, removing the source of the infection sound like a good idea.
Not really. There is such a variability in patient's oral anatomy it is nearly impossible for this to be considered.