When a whole arch has been lost, placing a separate implant for every tooth is neither necessary nor always possible. All-on-Four is built on the idea of carrying a full fixed bridge on four implants.
What makes it work is not the number but the angle. The two rear implants are placed on a tilt, which lets them anchor in the denser bone at the front of the jaw and takes bone loss further back out of the equation.
Who it suits
- Anyone who has lost all, or nearly all, of the teeth in one jaw
- People with removable dentures who are tired of them moving
- Those turned down for conventional implants because of bone loss at the back
- Anyone hoping to avoid many separate implants and a long grafting process
Is “teeth in a day” accurate?
Partly. A temporary fixed bridge is normally fitted straight after surgery, so you do not leave without teeth. But what you walk out with that day is not the final restoration.
The bone still has to grip the implants, the gums change shape as they heal, and the final bridge is made to fit that settled situation. So the result is completed at the end of a process, not in a day. Any promotion that leaves this out is setting the wrong expectation.
The Istanbul stage is planned as four treatment days with a five-night stay, and the surgery itself takes around two hours.
While you are in the temporary bridge you will be asked to avoid very hard foods. That is not because the bridge is fragile, but to keep early load off implants that are still healing.
Are four implants really enough?
In suitable cases, yes — the technique has been in use for a long time and has clinical follow-up behind it. But “suitable” is doing real work in that sentence: your bone volume, jaw shape and bite force are all assessed. For some patients the dentist will recommend more implants, and that is a mechanical necessity rather than an upsell.
How it differs from a denture
A conventional denture rests on the palate and gums, held by suction or adhesive. An All-on-Four bridge is screwed onto the implants: it is fixed in your mouth and you do not take it out.
In daily life that shows up in three ways. Bite force: with a fixed bridge you can chew firm foods, which most denture wearers do not risk. Speech: the shifts in sound caused by a moving denture disappear.
And the palate. In upper dentures, the plate covering the roof of the mouth noticeably dulls taste. An All-on-Four bridge does not need that plate — and this is the difference patients mention most.
How it is cleaned
Because the bridge is fixed you cannot take it out and rinse it; cleaning happens in the mouth, and this is the part that takes getting used to. The critical area is the underside where the bridge meets the gum: plaque gathers there and an ordinary brush struggles to reach it.
- A water flosser — the most practical way to clean the underside
- Superfloss, or floss made for cleaning under a bridge
- An interdental brush for the areas where the implants emerge
- A professional clean every six months — not optional with this treatment
Screw-retained bridges can be removed by the dentist when needed — a real advantage for deep cleaning or repair, which cemented bridges do not offer. Ask whether your bridge will be screw-retained or cemented.
Lower jaw or upper?
The two jaws are not equivalent. The lower jaw is denser, and implants usually achieve stronger initial stability there. The upper jaw is more porous, and the sinus cavities limit the available space.
Planning in the upper jaw is therefore more careful, and in some cases the dentist will recommend six implants rather than four. That is not an upsell but the mechanical reality of the upper jaw. Where bone loss is advanced, zygomatic implants come into consideration.
What happens if the bridge breaks?
It can usually be repaired: the broken part is remade and the implants are left alone. So the bridge material and how repairs are handled should be set out in your guarantee terms. Repeated fractures usually point to grinding, and are prevented with a night guard.
If one implant fails, is the bridge lost too?
No. A failed implant can be replaced and the bridge adapted. All four failing at once is not an expected scenario, which is why regular check-ups matter — they give you the chance to act early.