ALL ON 4, who's an ideal candidate?

A younger patient, such as in their 20s, 30s, and early 40s, may choose an alternate option if available. This is because the typical All on 4 case requires significant bone reshaping in order to make room for the prosthesis. Once this is done, the bone is reshaped for life. As a periodontist, my main objective is to save teeth whenever possible, unless there are ethical reasons not to. There are extreme cases where so much bone atrophy has taken place, that implants would be risky in terms of nerve damage or even fracture of the jaw. In some of these cases, if the All on 4 procedure does not work, the patient may need to accept a removable full denture as an only alternative. 

The candidates to looking for a all on 4 are patients who seek to have a prothesis that is fixes the patient can not remove by itself, this increases the confidence, security and self-esteem of the patient that the prosthesis will not fall.
Talking about the need to make a bone graft or not depends on the need whether the bone is adequate in quality and quantity.
Potencial candidates are those who have total prostheses that fall and patients in which the remaining teeth are very deteriordos and the cost-final result does not provide the expectations of a satisfactory aesthetic change.