What is All-on-4, and is it right for me?

What All-on-4 actually is

All-on-4 is a brand-trademarked term (registered by Nobel Biocare) for a specific technique of restoring a complete jaw with a fixed prosthesis on four implants. The technique was developed and published by Paulo Maló and colleagues in the early 2000s.¹ The defining features:

• Four implants per jaw — specifically two placed axially (roughly straight) in the front of the jaw and two placed at a tilt (typically around 30° to 45°) in the back of the jaw. The tilting allows the back implants to use available bone without needing extensive grafting.
• A fixed bridge of replacement teeth (typically 10–14 teeth per arch) is attached to those four implants.
• Often, immediate loading — the bridge is fitted on the same day as the surgery, or within 24–48 hours, so the patient leaves with fixed teeth from day one.

When done according to the protocol, All-on-4 can restore a full set of upper or lower teeth in a single surgical visit. That is the appeal: a patient who arrives with failing teeth or an unsatisfactory denture can leave with fixed teeth the same day.

A systematic review of All-on-4 outcomes reported a cumulative implant survival rate of about 99.8% beyond 24 months of function (Soto-Peñaloza et al., 2017), though follow-up periods varied and most studies were conducted by clinicians familiar with the technique.² As with all implant survival figures, this reflects research-grade cohorts rather than a guarantee for any individual case.

Who All-on-4 suits

The technique tends to be appropriate for patients who:

• Have lost, or are about to lose, most or all of the teeth in an arch.
• Want a fixed (non-removable) replacement, not a removable denture.
• Have adequate bone in the front of the jaw to support the two straight front implants.
• Lack adequate bone in the back of the jaw — but where the tilting protocol can place the back implants in available bone without needing major grafting.
• Are reasonably healthy and not heavy smokers.
• Are committed to the maintenance the prosthesis requires.

The pragmatic reason it is often chosen: it can avoid the need for sinus lifts (in the upper jaw) or significant ridge augmentation (in the lower jaw), both of which add cost, time, and complexity.

Who All-on-4 may not suit

It is not the right answer for everyone:

• Patients with adequate bone everywhere may be better served by five or six implants rather than four — more implants distribute load better and provide a backup if one fails.
• Patients with severe bone deficiency may need significant grafting whichever implant strategy is used; All-on-4 can avoid some grafting, but not all.
• Patients who can tolerate a removable solution may be better served by a high-quality implant-retained overdenture on two or four implants — which is simpler to maintain and significantly less expensive than a fixed bridge.
• Patients with parafunctional habits (severe bruxism / clenching) may put forces on the prosthesis that exceed what four implants can comfortably bear over decades.
• Heavy smokers carry higher peri-implantitis risk; concentrating that risk on four implants per arch may not be the best plan.

What the alternatives are

Two main alternatives for full-arch restoration:

1. An implant-retained overdenture. The patient still wears a removable denture, but the denture clips into two to four implants for stability. Significantly less expensive than a fixed bridge. The patient takes the denture out for cleaning, which is often easier to maintain. The trade-off is that it is removable rather than fixed.
2. A fixed bridge on five, six, or more implants. More implants distribute the load over more anchor points. Slightly more surgical and slightly more expensive than All-on-4, but with redundancy if one implant fails. Sometimes called "All-on-6" or "All-on-X".

The right answer depends on bone, budget, the patient's tolerance for a removable solution, and the patient's expected long-term maintenance commitment.

What the procedure looks like

A typical All-on-4 case has:

1. Planning consultation with CBCT scan, photographs, and impressions.
2. A surgical day: any remaining failing teeth are extracted, four implants are placed, and a fixed temporary bridge is attached (immediate loading).
3. A healing period of four to six months during which the temporary bridge is worn while the implants integrate.
4. The final bridge is then made and fitted — usually milled from a higher-strength material such as zirconia.

Recovery from the surgery is more substantial than from a single-implant placement — patients should plan for a week of soft-food diet and a few days off normal activity. Detailed post-operative instructions are provided.

What it costs

All-on-4 is a significant investment. The total cost includes the four implants, the surgical day, the immediate temporary bridge, the final bridge, and any pre-surgical work (extractions, sometimes grafting). In current South African specialist practice, the total per arch sits well above the cost of a single-tooth implant case; the specific figure for your case is in the written estimate.

Many medical aid plans cover a fraction of the implant component but rarely the full bridge. Pre-authorisation is required for substantially all cases. We help assemble the pre-authorisation pack.

Honest framing

All-on-4 is a real, well-published technique with documented results in suitable patients. It is also one of the most heavily marketed concepts in dentistry — the "teeth in a day" framing has been used by many practices and is sometimes overstated. The right way to think about it: it is one of several options, the suitability of which depends on your specific clinical situation and your priorities.

A specialist consultation will tell you whether All-on-4 is the right choice for you, or whether one of the alternatives is a better fit. If a practice quotes All-on-4 as the only option without discussing alternatives, that's worth a second opinion.

This article is general educational content. Whether All-on-4 is the right treatment for your case depends on a clinical and radiographic examination by a registered specialist.