Which is best for All-on-4, acrylic or porcelain?

Hi and thank you for your question.All the cases we do in our office are done with a final prosthesis made out of Zirconia. Acrylic prosthesis are subject to wear ,teeth can certainly break off and will at some point need to be replaced. Zirconia prosthesis are the best solutions, as these are unbreakeable, more esthetic and highly polished, so they won’t accumulate as much plaque as the acrylic prosthesis. So this are more hygienic.Good Luck,Dr. Juan C. Arroyo Oral and Maxillofacial Surgeon 

This is a very common question regarding All-On-4 dental implant treatment.  Some dentists say that porcelain or zirconia is "Always" best while others say that acrylic is always best.  For me, after doing more than 1,000 of these cases, the answer is that these teeth are very patient specific.  Items that must be considered are as follows: 1) what are your opposing teeth (natural, denture, acrylic hybrid, zirconia); 2) are you a grinder; 3) what is your budget; 4) what is your age; 5) are the implants being placed into regenerated bone; 6) what is the anterior-posterior spread of your implants
There are other factors to consider, even in addition to these.  If your dentist says that one type of restoration is "always" better than another, be wary.  One size does not fit all.  This is true for just about anything in life.  If one option was "always" the best, the other options would be eliminated.