All-on-4 uses four implants per arch and All-on-6 uses six, and neither is automatically better. Six can give more points of support where the bone allows a favorable spread, at the cost of two more surgical sites. Bone, implant spread, prosthesis design, bite and access for cleaning decide, confirmed by clinical exam and CBCT.
Neither All-on-4 nor All-on-6 is automatically better. The right number of implants depends on the bone available, how the implants can be spread, the planned prosthesis, your chewing forces and how easily you can clean the result. Four well-placed implants can make a coherent plan; six implants do not make up for poor positioning or a disease that is not under control. The final decision needs a clinical examination and 3D imaging.
If you are weighing a full-arch offer, whether from a dentist near you or from a clinic in Istanbul, this guide sets out the criteria that separate four from six implants, the questions to put to your surgeon, and the situations where another route, or waiting, is the wiser choice.
What “All-on-4” and “All-on-6” actually mean
“All-on-4” and “All-on-6” are the common names for a fixed full-arch prosthesis supported by four or six implants. On their own, the names say nothing about the brand, the material, the loading schedule or the quality of the treatment. All-on-4 is not a lighter version of All-on-6, either: each configuration answers a particular anatomy and a particular prosthetic plan.
In both approaches, an arch of missing or non-restorable teeth is replaced by a prosthesis attached to several implants. The implants can be placed straight or tilted, to make use of the favorable areas of bone and to avoid certain anatomical structures. A fixed temporary prosthesis can sometimes be delivered quickly if stability and biological conditions allow it; it must not be confused with the final prosthesis. Our guide to immediate loading explains those conditions.
The number also says nothing about which of your own teeth could be kept. Before any full extraction, ask which teeth have a reasonable prognosis, what alternatives exist and why a full-arch implant solution is being proposed.
This guide is about choosing between four and six implants, not about price. The process, the stays and the listed prices are covered in All-on-4 dental implants in Turkey and All-on-6 dental implants in Turkey. The cost items of a full arch are covered in the guide to what a full-mouth package includes.
Decision table: four or six implants
The table summarizes the medical criteria that tip the decision. No row names a winner: read each one with your own CBCT scan and clinical examination.
| Criterion | All-on-4 | All-on-6 | What matters more than the number |
|---|---|---|---|
| Number of supports | Four implants spread across the arch | Six implants, if the anatomy allows | Position, stability and how the implants line up for the prosthesis |
| Bone required | Can use front areas of bone and tilted implants | Needs additional favorable sites | CBCT scan and examination of the tissues |
| Force distribution | Depends heavily on a good spread of the implants | Can offer more points of support | Prosthesis design, bite and the length of the extensions (cantilevers) |
| Surgery | Fewer implant sites, but not “light” surgery | Two more sites, sometimes different bone preparation | General health, operating time and the team’s experience |
| If an implant fails | May compromise the overall plan more quickly | How it is managed depends on the position and timing of the failure | No system can promise that a prosthesis will stay usable |
| Maintenance | Cleaning under the whole arch | Cleaning under the whole arch | Hygienic shape of the prosthesis and regular check-ups |
| Cost | Depends on the whole plan, not only the number | May include more components | An itemized quote: temporary, final and follow-up |
When four implants make sense, and when six do
When can four implants be reasonable?
A reconstruction on four implants can be discussed when their anchorage and spread suit the planned prosthesis, the available space is adequate for the planned prosthesis and the risk factors are acceptable. Tilting the back implants can sometimes reduce the need for bone reconstruction, without making the technique universal or “graft-free” in every case. Our guide to dental implants without a bone graft goes into this point.
Four implants can also limit the number of surgical sites. Even so, the choice should never rest only on a panoramic X-ray or a commercial package.
What does All-on-6 offer, and when is it considered?
Six implants can be proposed when the bone volume allows a favorable spread and the prosthetic plan benefits from extra supports. The potential benefit is more points of support, which can make sense for certain anatomies, certain functional profiles or a particular maintenance strategy. The trade-off is two more surgical sites and, sometimes, different bone preparation. Placing six implants in unfavorable positions does not make the result automatically safer.
Your surgeon should explain what the two extra implants change in your case: distribution of forces, prosthesis length, loading protocol, repairability or backup plan. An answer that stops at “six is always stronger” is not enough.
Checks to complete before you choose
- a medical interview: illnesses, medications, allergies, smoking and previous surgery;
- an examination of the mouth and gums (periodontal examination), including a search for infection;
- a CBCT scan, read together with the clinical examination;
- an analysis of the teeth still present and of the opposing arch;
- a plan for the future teeth: appearance, speech, space and access for cleaning;
- an assessment of your bite, of teeth grinding (bruxism) and of your ability to follow instructions.
A remote estimate can help guide the process, but your consent should allow for the plan to change after the in-person examination.
Limits, risks, alternatives and when to postpone
Risks shared by both options
Both options carry the risks of implant surgery: pain, swelling, bleeding, infection, injury to an anatomical structure, failure of osseointegration (the implant does not bond with the bone) and the need to change the plan. Over the longer term there may be inflammation or bone loss around the implants (peri-implant), a loosened or fractured component, wear of the prosthesis, difficulty cleaning and a change in the bite.
A fixed prosthesis is not maintenance-free. It needs specific daily hygiene, described in our guide to caring for full-arch dental implants, and professional check-ups. Smoking, earlier gum disease, insufficient hygiene, some uncontrolled illnesses and teeth grinding can all change the risk; see smoking, diabetes, bruxism and dental implants for what is at stake.
Alternatives to compare
Depending on your teeth and the bone available, the alternatives include
- keeping strategic teeth;
- several segmented implant bridges;
- a removable overdenture stabilized by implants;
- a conventional complete denture;
- a bone graft with delayed implants;
- an advanced technique for a severely atrophic upper jaw.
Our guide to removable dentures in Istanbul covers the denture, the overdenture and the move to fixed teeth on implants.
When to postpone treatment
Not treating immediately can also be an option while the mouth is being brought back to health or a medical condition is being stabilized. In some situations it is wiser to treat an infection, stabilize gum disease or bring a general illness under control with the doctor who follows it before starting the reconstruction.
Checklist before you accept a plan
- [ ] The diagnosis and prognosis of each remaining tooth are written down.
- [ ] The surgeon explains why four or six implants are proposed.
- [ ] A backup plan is defined in case a site lacks stability.
- [ ] Temporary and final teeth are clearly distinguished.
- [ ] The material and the repair arrangements are specified.
- [ ] You have been shown how to clean the prosthesis.
- [ ] The quote itemizes surgery, components, prostheses and check-ups.
- [ ] Follow-up after you return home, and emergencies, are organized.
- [ ] You have been told you will receive an implant passport.
Sources
- ITI (International Team for Implantology): consensus statements and resources on full-arch implant rehabilitation.
- European Association for Osseointegration (EAO): clinical recommendations on implant rehabilitation.
- Systematic reviews comparing full-arch reconstructions on four and six implants.
Next step: ask for a first opinion
You can send your recent X-rays, medical history, current treatments and expectations to Dr. Türker Clinic in Istanbul on WhatsApp at +90 531 818 02 87 or through the contact page; see it for current opening hours. The team can give you initial guidance in English, along with the questions worth exploring further. At Dr. Türker Clinic, full-arch implant surgery is handled by the oral and maxillofacial surgeon, Assoc. Prof. Dr. Türker Yücesoy.
This remote review does not replace a clinical examination: it confirms neither your eligibility for four or six implants nor the possibility of immediate loading. No decision is expected at this stage.
Frequently asked questions
What is the difference between All-on-4 and All-on-6?
Both names describe a fixed full-arch prosthesis carried by implants: four for All-on-4, six for All-on-6. Six implants need additional favorable bone sites and two more surgical sites, but can offer more points of support. The position of the implants and the design of the prosthesis matter more than the number.
What are the benefits of All-on-6 compared with All-on-4?
Where the bone allows a favorable spread, six implants can offer more points of support, which may suit certain anatomies, functional profiles or maintenance strategies. The trade-off is two more surgical sites. It is not automatically better: ask your surgeon what the extra implants change in your case.
How many implants do I need for a full arch, four or six?
There is no single number. Four implants can be discussed when their anchorage and spread suit the planned prosthesis, the available space is adequate and the risk factors are acceptable. Six may be proposed when the bone allows a favorable spread. This is never settled from a panoramic X-ray or a package alone, only after a clinical exam and CBCT.
Do six implants last longer than four?
Not necessarily. The number of implants alone does not predict how long a restoration lasts. Diagnosis, implant position, prosthesis design, hygiene, mechanical load and follow-up all weigh heavily. Six implants placed in unfavorable positions are not automatically safer.
Does All-on-4 mean I will not need a bone graft?
No. Tilting the back implants can avoid some grafts in some cases, but the technique is not graft-free for everyone. Only an anatomical assessment on CBCT and a clinical exam can show whether bone reconstruction is still needed in your case.
Does the choice between All-on-4 and All-on-6 change if I have treatment in Istanbul?
The medical criteria are the same wherever you are treated: available bone, spread of the implants, prosthesis design, bite and access for cleaning. Traveling adds practical questions: how temporary and final teeth are distinguished, the backup plan if a site lacks stability, and follow-up once you are home. Dr. Türker Clinic's All-on-4 and All-on-6 pages set out the process and stays.
What happens if one implant fails?
It depends on the timing, the position of the implant, the cause and the stability of the whole restoration. With four implants a failure may compromise the overall plan more quickly; with six, how it is managed varies with the position and timing of the failure. The backup plan should be discussed before surgery.
Should price decide between All-on-4 and All-on-6?
No. Compare equivalent plans and what they include: surgery, components, temporary and final prostheses, check-ups. An itemized quote issued after a CBCT scan and clinical exam makes that possible. Dr. Türker Clinic's listed prices appear on its All-on-4 and All-on-6 pages, together with what each covers.
This guide informs; it does not replace a consultation or an individual diagnosis. Every case needs a clinical examination and 3D imaging.
