Can I get All-on-4 implants if I have enough bone?

While waiting 2 years isn't ideal, it is possible there will still be enough bone for implants or All on Four treatment after waiting, especially if the bone was grafted at the time the teeth were extracted.

All-On-4 (TM) style dental implants are sometimes referred to as a "no bone solution".  Now, this can have a few different meanings.  Some call it a "no bone solution" because they do not place bone grafts with this procedure.  They remove the teeth, place implants, do not place bone graft, and then immediately restore.  Concerning bone grafting, this is different than traditional dental implants.  With traditionally placed dental implants, a tooth is often removed, bone is placed and allowed to heal for 3 months, then an implant is placed and allowed to heal for another 3 months before it is used.  
Some call All-On-4 (TM) style dental implants a "no bone solution" because implants can often be placed in situations where patients have been told that they "have no bone".  Oftentimes, patients are told that they have no bone because of bone loss suffered due to periodontal disease.  While it is true that many of these folks have severe bone loss around the actually teeth, there is usually plenty of bone BENEATH the teeth to anchor the dental implants for All-On-4 procedures.  In these situations, the periodontally involved teeth are removed, the infected bone is adjusted away with special instruments, and the implants are placed into the nice healthy strong bone that exists beneath.  
In select rare cases, bone loss is SO severe that bone grafting must be accomplished prior to dental implant placement.  In my experience of over 1,000 completed All-On-4 (TM) style dental implant cases, this only tends to occur when patients have been in dentures for DECADES and it usually only occurs in the upper jaw.  In the lower jaw, if you still have a chin, you typically have enough bone for All-On-4 (TM) style dental implants!  In the upper jaw, if the sinuses have greatly expanded or if the bone beneath your nose has completely disintegrated away, there are still techniques that we can use to get you a full set of implant teeth.
I hope this helps!

It is very likely that you can get implants for the All-on-4 two years, and even longer, after the teeth are removed. This varies from case to case as everyone's bio-type and anatomy differs to a certain degree. There are also cases where patients lose all of their teeth because of advanced periodontal disease and even if done immediately, the All-on-4 treatment can be challenging due to the loss of bone from the disease.