I've done 8 on top and below and that will be enough to support a full set of teeth on the upper jaw and lower jaw.
I wouldn't go more than 8 implants on top or below.
Sometimes, based on the case, you can even get away with 4 implants or maybe even 2 implants on the bottom.
A lot of factors come into play as well and one of the important factors is the patient's:
- Budget
- Health
- State of remaining bone
- Whether or not the patient is willing to go through extensive bone grafts
There are some many factors that we need to discuss with the patient that could influence the number of implants to place, but in an ideal situation, where budget is not an issue and when there are enough gum and bone and no need for bone grafts, we can maybe even put up to 8 implants on top and below for maximum support.
