Three-on-Six Dental Implants: How Do They Compare With All-on-X?

Although both treatments use dental implants to support a fixed set of teeth, the design of the final teeth can be quite different.

At Burleigh Dentistry & Implants, we believe it is important to understand these differences before deciding which treatment approach may be appropriate for you.

What are Three-on-Six dental implants?

Three-on-Six is a full-arch implant treatment concept that generally uses six dental implants to support three separate fixed bridges.

Rather than constructing the entire arch as one continuous bridge, the teeth are divided into three sections.

The aim, where the patient’s bone and gum anatomy allows, is to create teeth that emerge more naturally from the gum rather than having a large amount of artificial pink gum incorporated into the prosthesis.

This can make Three-on-Six particularly interesting to patients who are looking for a fixed implant solution that resembles individual teeth and conventional dental bridges.

How do Three-on-Six dental implants work?

A detailed examination and 3D CBCT scan are required before treatment.

The dentist assesses the available bone, position of the sinuses and nerves, gum levels, smile line, bite and the amount of tooth and gum tissue that has been lost.

If the anatomy is suitable, implants can then be planned at strategic positions around the dental arch.

Once healing and integration have occurred, the implants support three fixed bridge sections that together replace the teeth across the arch.

The exact treatment sequence varies significantly between patients. In some situations additional procedures, including bone or soft-tissue grafting, may be required.

Three-on-Six vs All-on-X dental implants

The biggest difference is not simply the number of implants.

All-on-X usually describes a full-arch restoration in which four or more implants support one connected full-arch prosthesis.

Three-on-Six typically uses six implants supporting three separate bridges.

Another important difference can be the way missing gum tissue is managed.

Some All-on-X restorations replace both teeth and a significant amount of lost gum tissue. These are sometimes referred to as an FP3-style restoration and commonly incorporate pink restorative material to reproduce the missing gum.

With Three-on-Six, the objective is often to preserve or create an appropriate gum architecture so that the final bridges can emerge from the patient’s own gum tissue with less artificial pink material.

However, this is highly dependent upon the patient’s starting anatomy.

Why might someone consider Three-on-Six?

One of the attractions of the concept is the possibility of achieving a restoration that resembles conventional teeth and bridges rather than a single full-arch prosthesis.

Having the restoration divided into three sections may also have practical advantages when it comes to maintenance or repair because one section can potentially be managed independently of the rest of the arch.

The design can also allow spaces between the bridge sections to be created for cleaning.

However, these potential benefits do not mean Three-on-Six is automatically the better treatment.

The correct treatment depends on the individual patient.

What are the limitations of Three-on-Six?

Three-on-Six can be more dependent on having favourable bone and gum anatomy.

Patients who have experienced substantial bone loss may not have enough supporting tissue to create a natural-looking tooth-to-gum transition without additional surgical procedures.

Bone grafting, soft-tissue grafting or changes to the restorative design may therefore be required.

In some patients an All-on-X-style restoration that replaces both teeth and missing gum tissue may provide a more predictable result.

There are also important differences in cost, treatment time, surgical complexity and maintenance that need to be considered.

Who may be suitable for Three-on-Six?

Suitability cannot be determined simply from photographs or a standard dental X-ray.

We assess factors including the amount and quality of available bone, gum architecture and smile line, as well as facial proportions, bite, remaining teeth and the position in which implants can safely be placed.

Your expectations are also important.

Some patients strongly prefer a restoration with minimal artificial gum, while others prioritise a shorter treatment process or wish to avoid extensive grafting.

Understanding these priorities helps us determine which treatment concept is most appropriate.

Why is a CBCT scan important?

Full-arch implant treatment requires three-dimensional planning.

A CBCT scan allows us to assess the height, width and shape of the available jawbone as well as important anatomical structures that cannot be accurately evaluated using a two-dimensional X-ray alone.

This information allows us to determine whether Three-on-Six is realistic and whether grafting or an alternative full-arch approach should be considered.

Three-on-Six, All-on-X or another option?

There is no single full-arch implant technique that is best for every patient.

Three-on-Six may be an excellent option for some patients, while an All-on-X restoration may be more appropriate for others.

Our approach is to first determine what is biologically and mechanically achievable, then discuss the advantages and disadvantages of the different restorative designs with you.

If you are considering full-arch dental implants and would like to know whether Three-on-Six, All-on-X or another implant solution may be appropriate, you are welcome to arrange a consultation with Burleigh Dentistry & Implants.