All-on-4 vs All-on-6: Longevity & Success Rates
'94–98% success' is one of the most repeated figures in full-arch implant marketing, and one of the least examined. Survival, success, prosthesis survival and patient-reported outcomes are four different measurements, not four names for the same thing — and conflating them is how an honest evidence base gets turned into a marketing slogan. This page sets out what each term actually means, and what a fair reading of the literature can and cannot tell you about All-on-4 versus All-on-6.
Written by All-on-4 vs All-on-6 — Editorial · Clinically reviewed by Dr Weaam Elmahi Ballal, GDC 248628 · Last medically reviewed 20 July 2026
Does All-on-6 last longer than All-on-4?
The published evidence does not show that one configuration reliably outlasts the other. Both All-on-4 and All-on-6, when well planned and well placed, are reported with high implant survival across the follow-up periods studied — most commonly 5–10 years. But "survival" is a narrower measurement than "success", and the studies behind each configuration differ in how they define outcomes, how long they follow patients, and how many patients they include, which makes a precise like-for-like comparison genuinely difficult. What the evidence consistently does show is that planning accuracy, hygiene, bite management and clinic follow-up affect longevity more than the raw implant count — see what actually determines how long yours lasts below.
Four different measurements, not one number
Full-arch implant literature reports several distinct outcome measures, and treating them as interchangeable is the single most common way an honest figure gets misused. Before any percentage is worth reading, it helps to know exactly which of these it is describing:
| Measure | What it actually captures |
|---|---|
| Implant survival | The implant fixture is still present in the jaw and has not been removed — a binary, presence-only measure that says nothing about function or comfort. |
| Implant success | A stricter, criteria-based judgement — typically no mobility, no persistent pain or infection, bone loss within an accepted threshold, and no ongoing complications — assessed against a defined published framework. |
| Prosthesis survival | Whether the bridge sitting on top of the implants is still in place and functioning. A prosthesis can be remade even when every implant beneath it remains successful, and can sometimes continue in service after an individual implant is replaced. |
| Patient-reported outcomes (PROMs) | The patient's own rating of chewing ability, comfort, appearance and quality of life, typically captured with a validated questionnaire — a distinct measure from any clinician-assessed figure above it. |
A single implant can, in principle, "survive" for years while never meeting the fuller criteria for "success" — still present, but with bone loss beyond an accepted threshold, or causing intermittent discomfort. Equally, a prosthesis can be remade or adjusted while every implant supporting it remains successful by clinical criteria. None of these measures substitutes for another, and a source that quotes only one — most often survival, because it is the easiest to define and the highest figure — without saying which one it means should be read with that in mind.
Why "94–98% success" is a claim to interrogate, not repeat
A range like this circulates widely in full-arch implant marketing, almost always without a stated source, definition or timeframe attached. Reputable research does report high implant survival for full-arch restorations — systematic reviews of All-on-4 and comparable full-arch protocols have generally reported cumulative implant survival in the low-to-high 90s as a percentage over 5–10 years of follow-up, in well-selected cases placed by experienced surgeons. But that figure varies meaningfully between studies depending on the population studied, the implant system used, how long patients were followed, and — critically — whether the study measured survival or the stricter criteria for success. A number repeated without any of that context is not evidence; it is a slogan borrowed from evidence. Any percentage on this page states, as far as the underlying literature allows, what it is measuring and over what period, rather than presenting a bare figure as an unqualified guarantee.
What the evidence can tell you about All-on-4 vs All-on-6
Read fairly, the published research supports a small number of genuinely evidence-based conclusions:
- Both configurations, in well-selected patients treated by experienced clinicians, are reported with high implant survival across the follow-up periods most commonly studied.
- The original All-on-4 protocol has a comparatively long published follow-up record, reflecting how long it has been in clinical use and studied.
- Mechanical complications (screw loosening, bridge fracture, veneer chipping) are reported more often than true implant loss for full-arch restorations generally, in both configurations.
- Peri-implant disease, smoking, uncontrolled systemic conditions and unmanaged bruxism are consistently associated with poorer long-term outcomes, independent of implant count — see failure & complications for the fuller picture of these risk factors.
What the evidence cannot tell you — and why
Equally important is what a fair reading of the literature does not support, because the studies simply are not designed to answer it cleanly:
- Direct head-to-head comparisons are scarce. Few published studies randomise or directly compare four- versus six-implant full-arch restorations within the same patient population, implant system and follow-up protocol — most of the literature reports one configuration or the other, from different clinics, patient groups and time periods, which makes a precise numerical comparison between them unreliable.
- Definitions of "success" are not standardised across every study. Different research groups have used different criteria over the decades, so a "success rate" from one paper is not always measuring the same thing as a "success rate" from another.
- Follow-up lengths vary widely. A study following patients for 3 years and one following them for 10 years both being summarised as "high success" hides a meaningful difference in how much is actually known about long-term durability.
- Patient populations differ. Bone quality, smoking prevalence, bruxism rates and general health vary between study cohorts, and none of these are held constant between an "All-on-4 study" and an "All-on-6 study" published years apart by different research groups.
- Publication and selection factors. Case series and retrospective reviews — common in this literature — can under-represent patients who were lost to follow-up or who experienced early complications, which tends to bias reported figures toward the more favourable end.
None of this means the evidence is worthless — it means a precise, sourced comparison between All-on-4 and All-on-6 longevity, specifically, is more limited than marketing copy on either side tends to suggest. See research & evidence for a sourced summary of individual studies, their design, follow-up length and how each defined its outcomes, so the strength of any given claim can be judged directly rather than taken on trust.
Implant count and mechanical resilience — a genuine, but limited, factor
Where implant count does have a documented biomechanical basis is load distribution: spreading bite force across more supporting fixtures can, in principle, reduce the stress carried by any one implant, which is relevant for a heavier bite or confirmed bruxism. This is a real mechanical consideration, discussed in the prosthodontic literature, and it is one of the legitimate reasons a clinician might favour six implants for a specific case. It is not, on its own, evidence that a six-implant restoration will demonstrably last longer in general — mechanical theory about load distribution and a comparative longevity claim across the wider patient population are two different things, and the published outcome data does not currently support treating them as equivalent. See who needs which for how bite force and bruxism actually factor into that decision.
If one implant is lost — does implant count act as a safety margin?
Additional implants may add supporting points, but losing any implant — in a four- or a six-implant restoration — still generally requires clinical reassessment: of loading, of the prosthesis, and sometimes of the wider treatment plan. It is not accurate to describe a six-implant case as simply continuing unaffected with "the other five" once one implant is lost; a full-arch bridge is engineered as a single connected structure, and the loss of any one implant changes the mechanical situation for the rest. See failure & complications for the fuller explanation of why implant count is not automatically a built-in safety net.
What actually determines how long your own restoration lasts
Across the literature, the factors most consistently associated with long-term durability — for either configuration — are not primarily about implant count:
- Accurate CBCT-guided planning and precise surgical placement.
- The implant system used and the quality of the prosthesis design and engineering.
- Daily hygiene, and attendance at scheduled professional reviews — see cleaning & maintenance for what this generally involves.
- Smoking status, and whether systemic conditions such as diabetes are well controlled.
- Whether bruxism is identified and actively managed, for example with a night guard.
Put together, these factors are why the choice of clinic and clinician, and a patient's own follow-through with hygiene and reviews, are reported as more consistently influential on long-term outcomes than whether an arch was restored on four or six implants. Our disclosed clinical partner, Taki Dent in Antalya, sets out a written guarantee alongside structured aftercare — details are available directly from the clinic, and any prospective patient should confirm the specific terms in writing before treatment, as with any provider.
Reading a clinic's own success-rate claim
When a clinic quotes its own figure, it is reasonable to ask: is this survival or success, by what definition, over what follow-up period, based on how many patients, and is it an internally tracked figure or one drawn from independently published research? A clinic that can answer these questions specifically is giving you something closer to evidence; a bare percentage with no further detail is not verifiable and should be treated with the same caution as any unsourced statistic.
Frequently asked questions
What is the difference between implant survival and implant success?
Survival simply means the implant fixture is still present in the jaw and has not been removed — it says nothing about how well it is functioning. Success is a stricter, criteria-based judgement: no mobility, no persistent pain or infection, bone loss around the implant within an accepted threshold, and no ongoing complications, usually assessed against a published framework such as the Albrektsson criteria. An implant can survive for years while falling short of every success criterion, which is why the two figures are not interchangeable and a study reporting only survival is not automatically reporting good outcomes.
Does a high survival rate mean the treatment was a success?
Not necessarily. Survival is the lowest bar — the implant is still there. It does not capture whether the surrounding bone and gum are healthy, whether the patient is free of pain or discomfort, or whether the prosthesis on top is functioning well. A full picture needs survival, success criteria, prosthesis survival and, ideally, how the patient rates their own outcome, considered together rather than any single figure taken in isolation.
Do studies show that All-on-6 lasts longer than All-on-4?
The published evidence does not support that as a general rule. Studies of the two configurations differ in patient selection, follow-up length, how survival or success is defined, implant systems used and sample size, and there are very few direct head-to-head studies comparing four- and six-implant full-arch restorations in the same population. Both approaches, when well planned and placed, are reported with high survival in the literature. Claims that one configuration categorically outlasts the other are not something the current evidence base can responsibly support — see how the evidence can and cannot be compared below.
How long can a full-arch implant bridge actually be expected to last?
There is no single answer that applies to every case. Published follow-up periods for full-arch implant-supported restorations most commonly extend to around 5–10 years, with a smaller number of studies reporting longer follow-up; beyond that window the evidence thins out for both configurations. Individual bridges have been reported in clinical practice to remain in service well beyond a study's follow-up period, but that is a case-by-case clinical observation, not a guaranteed figure any page can promise a specific patient.
What affects how long my own restoration lasts more than the implant count?
Accurate CBCT-based planning and precise surgical placement, the implant system and prosthesis design used, daily hygiene and attendance at professional reviews, smoking status, whether conditions such as diabetes are well controlled, and whether bruxism is identified and managed (for example with a night guard) are all reported in the literature as more consistently influential than whether an arch was restored on four or six implants. See failure & complications for how these same factors relate to risk, and cleaning & maintenance for what day-to-day care generally involves.
Where can I check the actual research behind claims like this?
See research & evidence for a sourced summary of the published studies this page draws on, including study type, follow-up length and how each defined survival or success — so you can judge the strength of the evidence for yourself rather than relying on a single quoted percentage.
For the sourced study-by-study evidence behind the general statements on this page, see research & evidence. For how bone, bite and other individual factors decide which configuration a clinician might discuss for your own case, see who needs which. Return to the All-on-4 vs All-on-6 comparison home page for the full overview.