Hello 1joel2u,
The most life-like material that we have in dentistry today is porcelain. Remember that porcelain and ceramic are the same for the purposes of our conversation here. A dentist will use the terms interchangeably.
In regards to All-on-4 dental implant treatments, the choices are - Acrylic Teeth, Porcelain Teeth, or Zirconia Teeth or a combination of the above. The strongest of all with the least amount of complications is zirconia. It also comes VERY VERY close to the aesthetics of a porcelain crown that the naked eye cannot discern the difference.
It is also important to keep in mind that one material doesn't solve all problems. Some patients are not zirconia candidates so I highly recommend you see a prosthodontist (prosthetic specialist) for an evaluation and proper planning.
I hope that answers your question.