All on 3

all on 3

What is an all on 3?

All on 3 is the short name for an implant supported prosthesis that is only on 3 implants instead of the traditional minimum of 4. It is definitely more controversial but seems to work well in the lower jaw.

All on 3 (AO3) research

An AO3 works according to Oliva 2012, but this was a small study where all but 1 case was loaded conventionally. Bedrossian JOMI 2019 states AO3 is fine but should use wider diameter implants.

The dental implants seem to hold up with same percentage but the prosthesis may have more issues according to Lima JOMI 2018. Mezzari JOMI 2019  has a 5 year study on the all on 3 showing 97% success at 5 years when done in the mandible.

The example below is from a multi-national study and is showing success. Kenji 2020 JOMI

The all on 3 prosthesis can work
This one is a novel all on 3 design.

A systematic review on the all on 3 finds similar survival rates. Brandão JPros 2021 

All on 2 and all on 1 or fixed-on-1 and fixed-on-2

This can work in the right circumstance. It is very outside the normal treatment regimen though and should be a last effort on a very old patient opposing a denture. Cannizzaro JOI 2019

What are the steps for the AO3?

The steps are the same as any implant supported denture.