How long does an All-on-4 denture implant last, in years?

If you require to NEVER fix/replace anything in dentistry, you will be disappointed.  Many things last a very long time, but nothing is permanent.  The average for an All on Four hybrid denture is 10 years, but some last much longer than that.  If it is made out of Prettau Zirconia, it may last longer, but more hybrids are made of acrylic.  Over time the porosity can acquire a taste/smell that requires replacement, so be sure to choose a material that lasts.

Hi and thank you for your question:
There are several factors that will affect the longevity of every dental implant case.
Some of this area:
1-Hygiene habit of the pt. (Frequency of brushing,flossing and water pick)
2-Use of alcohol (how frequent) and smoking.
3- Hereditary factors (medical conditions)
4- Type of diet 
The materials use to finish the All on four case Will also affect the longevity at least of the prosthesis.
1- Plastic teeth and acrylic dentures will wear out quicker depending what it opposes, if it opposes natural teeth, zirconia, porcelain they will wear out quicker. If similar materials are used zirconia vs. zirconia this will last many years as this material is extremely durable.
2- Type of diet will also cause plastic teeth to wear faster as well.
We typically give our patients a occlusal guard to further protect the prosthesis and the implants as well.
I hope this helps you to make a decision,
Dr. Arroyo, Oral Surgeon.

The All on 4 prosthesis could vary in terms of longevity based on different chewing forces, materials used to fabricate the prosthesis, etc. The foundation for the teeth, which are the implants, should be placed by the surgeon with the intention of them lasting a lifetime. This is an important overlooked factor because people are living longer and it is important to factor in longevity up to 40+ years.