All on four treatment is only one option to edentulous and soon-to-be edentulous patients. Its success depends on many factors that must be properly diagnosed before it is recommended.
Though most patients are good candidates, there are some circumstances that have to be taken into consideration since not everyone is a good candidate for an All on 4 denture. In many cases it is advised to have 6 or 8 implants instead of all on four surgery.
Before getting an All on four denture, you are advised to have checked your overall medical condition because there are some diseases that will affect the outcome of the treatment. For example losing your teeth can be caused by undiagnosed diabetes. An uncontrolled diabetic condition is a risk to the success of All on four.
Smoking and other habits
If you are a heavy smoker the risk of failure is higher. This is not a contraindication, but could be a reason for more than four implants to support your final prosthesis.
Amount of jawbone remaining
Remaining jawbone is evaluated with a CBCT scan during your first consultation. If you do not have enough bone you still may be a candidate, however bone grafting may be necessary.