All-on-4 vs All-on-6: Which Full-Arch Solution?
Updated July 2026
The short answer: both All-on-4 and All-on-6 replace a complete arch of teeth with a fixed bridge anchored on dental implants. All-on-4 does it with four implants, tilting the back two so they anchor in the denser bone at the front of the jaw — which is why it often works without bone grafting. All-on-6 uses six implants to spread chewing forces across more supports, but it needs more bone volume, particularly towards the back of the jaw. Neither is automatically better: the right answer comes from a 3D scan of your bone, not from a price list.
All-on-4 vs All-on-6 at a glance
| All-on-4 | All-on-6 | |
|---|---|---|
| Implants per arch | 4 (2 straight front, 2 tilted back) | 6, more evenly distributed |
| Bone needed | Less — uses dense front-of-jaw bone | More, especially towards the back |
| Bone grafting | Often avoidable | More likely if the posterior jaw has shrunk |
| Load distribution | Concentrated on 4 supports | Spread across 6 supports |
| Typical candidate | Moderate to advanced bone loss | Good bone volume, strong bite |
| Relative cost | Lower — fewer implants | Higher — two more implants |
How All-on-4 works
All-on-4 was developed to give patients fixed teeth even after years of bone loss. Four implants are placed per arch: two vertically in the front, two tilted at the back. On these four supports a full bridge of ten to twelve teeth is fixed — no palate plate, no adhesive, nothing removable. In suitable cases a provisional fixed bridge can be attached within the first days after surgery (so-called immediate loading), and the definitive bridge follows once the implants have fused with the bone, typically after 3–6 months.
The clever part is geometry: by angling the rear implants, longer implants can be anchored in the bone that is still present in front of the sinus and the nerve canal. That is what frequently makes grafting unnecessary — and it is why All-on-4 became the standard answer for jaws with significant shrinkage.
What All-on-6 adds
All-on-6 follows the same principle with two extra implants per arch. The chewing load is spread across six supports instead of four, the spans of bridge between implants become shorter, and the sections of bridge extending behind the last implant (cantilevers) can be reduced or eliminated. Some clinicians also value the redundancy: with six supports, the loss of a single implant is less critical for the whole construction.
The trade-off is biological: six implants need more bone, especially in the posterior jaw — exactly the region that shrinks first after tooth loss. If that volume is missing, All-on-6 becomes possible only with additional procedures such as a sinus lift or bone grafting, which add healing time. Published research shows high survival rates for both concepts; the honest difference is not quality but where the support sits and how much bone it requires.
Bone volume decides — not the catalogue
The single most important step before any full-arch treatment is a 3D scan (CBCT). It shows exactly how much bone remains, where the sinus floor and nerve canal run, and how dense the bone is. In the upper jaw, the sinuses naturally enlarge after tooth loss and the bone is softer — which is why upper jaws are commonly restored with six implants when the volume allows it, while lower jaws often do very well on four. Any clinic that quotes you a fixed concept before seeing a 3D scan is guessing.
The restorative perspective: the bridge matters as much as the implants
As a prosthodontist, Dr. Atay plans full-arch cases from the teeth backwards. The final bridge — its tooth positions, bite relationship and material — determines where implants should sit, not the other way round. This prosthetically driven planning weighs:
- Bite forces: heavy bites and grinding favour more supports and stronger bridge materials such as monolithic zirconia.
- Cantilever length: how far the bridge extends behind the last implant — shorter is mechanically safer.
- Opposing teeth: a full-arch bridge biting against natural teeth behaves differently from one biting against another bridge or a denture.
- Hygiene access: the bridge must be shaped so you can actually clean under it — a design decision, not an afterthought.
Seen from this angle, the number of implants is one variable in a larger engineering problem — important, but never the whole story. You can read more about the treatment itself on our All-on-4 implants page.
Which one is right for you?
- All-on-4 tends to suit: patients with moderate to advanced bone loss, those who want to avoid grafting and extra healing stages, and cases where treatment time and cost should stay compact.
- All-on-6 tends to suit: patients with good bone volume, strong bite forces or bruxism, and cases where the scan shows enough posterior bone to place six implants without grafting.
- Often it is both: a common real-world plan is six implants in the softer upper jaw and four in the denser lower jaw — decided per jaw, per scan.
Full-arch treatment in Istanbul: what the timeline looks like
Full-arch implant work from Istanbul typically follows a two-visit pattern. The first visit of around a week covers the 3D scan, any extractions, implant placement and — in suitable cases — fixed provisional teeth. After 3–6 months of healing at home, a second visit of about a week is used to fit the definitive bridge. Costs in Istanbul are typically 60–70% less than in Western Europe for the same international implant brands; ask for the brand documentation as a matter of course. If missing teeth are only part of a larger problem, a full-mouth rehabilitation may be the better frame for planning.
Find out which full-arch solution your jaw actually supports
Send a panoramic X-ray or CT scan if you have one — or simply a few photos. Dr. Atay's team will review your case honestly and without obligation.
WhatsApp Consultation All-on-4 Implants →Frequently asked questions
Is All-on-6 better than All-on-4?
Not universally. All-on-6 spreads chewing load across more implants but needs more bone; All-on-4 makes the most of limited bone by tilting the posterior implants. Both achieve high documented survival rates — the right choice depends on your 3D bone scan, bite forces and jaw shape.
Can four implants really support a whole arch of teeth?
Yes, in suitable cases. The tilted posterior implants anchor in the denser bone at the front of the jaw, and the four supports are positioned so they share the load of a full fixed bridge. The concept has been used and studied internationally for over two decades.
Do I need bone grafting for All-on-4 or All-on-6?
All-on-4 was designed largely to avoid grafting by making the most of the bone you still have. All-on-6 requires more bone volume, so grafting or a sinus lift is more often part of the plan when the posterior jaw has shrunk. A CBCT scan gives the definitive answer.
How long do full-arch implants last?
The implants themselves can last decades with good hygiene and regular check-ups. The bridge is subject to wear and may need maintenance or renewal over the years — material choice and bite protection play a big role. Individual results vary.
How many trips to Istanbul does full-arch treatment take?
Typically two: a first visit of around a week for implant placement, often with fixed provisional teeth in suitable cases, then a second visit after 3–6 months of healing for the final bridge.