Allon4

What Is All-on-4 and Which Patients Is This Technique For?

Introduction

The total loss of teeth in one jaw (complete edentulism) represents a complex clinical situation, with major consequences for chewing function, facial aesthetics, and overall quality of life.
The All-on-4 technique has profoundly transformed the management of these patients by offering a fixed, stable, and rapid solution, often without the need for extensive bone grafting.

What Is the All-on-4 Technique?

All-on-4 is an implant concept that allows a full-arch fixed prosthesis to be supported by only four dental implants, strategically placed within the same jaw.

The principle is based on:

2 straight anterior implants
2 tilted posterior implants (approximately 30–45°)

This configuration makes it possible to:

optimize bone anchorage
avoid anatomical risk areas (maxillary sinus, inferior alveolar nerve)
increase the prosthetic support surface

Why Are the Posterior Implants Tilted?

The angulation of the posterior implants is one of the key features of the All-on-4 concept.

It allows:

use of the anterior bone, which is often better preserved
avoidance of sinus lift procedures in the upper jaw
avoidance of posterior bone grafting
increased effective implant length
improved primary stability

This strategy significantly reduces surgical complexity while maintaining excellent reliability.

Which Patients Are Suitable for All-on-4?

The All-on-4 technique is mainly indicated for:

fully edentulous patients
patients with remaining teeth that cannot be preserved
wearers of unstable complete dentures
patients with moderate to advanced bone resorption

It is particularly suitable when:

posterior bone volume is insufficient
the patient desires a fixed solution
bone grafting should be avoided or is contraindicated

A thorough pre-implant assessment remains essential to confirm suitability.

All-on-4 and Immediate Loading

One of the major advantages of All-on-4 is the possibility, in many cases, of immediate loading.

This means:

the implants are placed
a temporary fixed prosthesis is screwed in place the same day or within 48 hours
the patient leaves with fixed teeth

This approach improves:

psychological comfort
chewing function
treatment acceptance

However, it requires high primary stability and precise control of occlusion.

What Are the Advantages of All-on-4?

The benefits of this technique are numerous:

fixed, stable, and comfortable solution
reduced number of implants
less invasive surgery
shortened treatment time
often no bone grafting required
immediate improvement in facial aesthetics

For many patients, All-on-4 is a reliable alternative to removable dentures, which are often poorly tolerated.

What Are the Limitations and Constraints of All-on-4?

Despite its advantages, All-on-4 is not a universal solution.

Its limitations include:

the need for sufficient anterior bone volume
dependence on highly precise planning
high prosthetic demands
strict maintenance requirements

In addition, incorrect case selection or imprecise execution may lead to:

implant overload
mechanical complications
long-term failures

This highlights the importance of entrusting this type of treatment to an experienced clinical team.

All-on-4 vs. Removable Complete Dentures

Unlike removable dentures:

All-on-4 is fixed
it does not move
it improves chewing efficiency
it limits bone resorption
it offers superior comfort and security

For many patients, this represents a dramatic improvement in quality of life.

All-on-4 and Long-Term Follow-Up

The success of All-on-4 does not end with surgery.

It relies on:

regular follow-up visits
meticulous oral hygiene
appropriate prosthetic maintenance

A definitive prosthesis—often made of zirconia or ceramic—is placed after the healing phase.
At Budapest-implant.fr, long-term follow-up is an integral part of the treatment protocol.