All-on-4 and All-on-6 are full-arch implant concepts for people who have lost most or all teeth in one jaw, or whose remaining teeth cannot predictably be saved. The names describe how many implants usually support a fixed bridge: four or six. They do not describe a universal package, a particular implant brand or a guarantee of same-day final teeth.
The right choice depends on bone volume and quality, jaw anatomy, bite forces, medical history, smoking, gum condition, available cleaning space and the design of the planned bridge. Six implants may offer more support and redundancy in some cases. Four implants may avoid grafting and make good use of available bone in others. More implants are not automatically better, and fewer implants are not automatically less safe.
Quick answer: choose the plan that is supported by a proper examination and three-dimensional imaging, not the package with the strongest sales claim. Current evidence suggests that both concepts can work well in selected patients, but individual risk assessment and long-term maintenance matter more than the number in the name.
Request a free consultation and send your recent panoramic X-ray or CBCT if available. We can explain what can be estimated remotely and what must be confirmed in Istanbul.
All-on-4 and All-on-6 at a glance
| Question | All-on-4 | All-on-6 |
|---|---|---|
| Implants per jaw | Usually four | Usually six |
| Typical purpose | Supports a fixed full-arch bridge | Supports a fixed full-arch bridge |
| Bone requirements | May use tilted posterior implants to use available bone | Needs suitable space and bone for two additional implants |
| Potential advantage | Can reduce surgical complexity in selected cases | May distribute load and provide additional support in selected cases |
| Potential limitation | Each implant has a larger role in supporting the bridge | Not possible or useful in every jaw; may add surgery and cost |
| Final decision | Clinical examination, CBCT, bite analysis and prosthetic planning | |
Who may be considered for full-arch implants?
A full-arch implant bridge may be considered when a person has no teeth in a jaw, has many failing teeth, or has a removable denture and wants a fixed option. It is not automatically the best answer for every damaged smile. Natural teeth that have a reasonable long-term prognosis should not be removed simply to fit a standard package.
At Dental Institute of Istanbul, our planning philosophy is minimally invasive: preserve useful natural teeth where this is clinically sensible, and replace teeth only when their prognosis justifies it. A full-arch plan should follow diagnosis. It should not replace diagnosis.
Before recommending either concept, the team may need to assess:
- the condition and prognosis of every remaining tooth;
- bone height, width and density on CBCT;
- the location of nerves and sinuses;
- gum health, infection and previous periodontal disease;
- smoking, diabetes, medications and healing risk;
- jaw relationship, clenching or grinding;
- smile line, speech and facial support;
- whether the patient can clean under the bridge;
- the desired bridge material and repair strategy.
When four implants may be appropriate
Four implants can be a sound design when the available bone allows stable placement in useful positions and the planned bridge can be supported without unacceptable cantilever or overload. Tilted posterior implants may help use bone in front of the sinus or nerve and may reduce the need for grafting in selected cases.
This does not mean grafting is never needed. It also does not mean every patient can receive an immediate fixed temporary bridge. Implant stability, bone quality, the bite and the surgical findings determine whether immediate loading is appropriate.
When six implants may be appropriate
Six implants may be useful when anatomy allows good implant distribution and the prosthetic design benefits from additional support. It may offer more options if one implant later develops a problem, although this depends on implant positions and the bridge design. Patients with high bite forces, a long arch or particular restorative needs may be considered for six implants.
Adding implants is not automatically an upgrade. If the fifth or sixth implant would be poorly positioned, require unnecessary grafting or make hygiene harder, the extra surgery may not improve the result. The useful question is not “Can six implants fit?” but “Does the complete plan become more predictable with six?”
What does research say?
Recent reviews report broadly comparable survival and clinical outcomes for four- and six-implant full-arch designs, while also warning that studies differ in patient selection, follow-up, implant systems and prosthetic designs. That means population-level results cannot decide an individual case. A 2026 international consensus also emphasised risk assessment, restorative planning, maintenance and management of complications rather than treating implant number as the only decision.
The practical conclusion is simple: both approaches can be valid. A responsible clinic should be able to show why the chosen number, positions and bridge design fit your anatomy and risks.
What timeline should you expect in Turkey?
The treatment is usually staged, even when temporary teeth are fitted soon after surgery. A common sequence is:
- Remote assessment: dental photos, medical history and available X-rays are reviewed. This produces an estimate, not a final diagnosis.
- In-person records: examination, CBCT, scans, bite records and photographs confirm whether the initial plan is suitable.
- Surgery: failing teeth may be removed and implants placed. Grafting may be added when needed.
- Temporary phase: a fixed or removable temporary restoration may be provided depending on implant stability and risk.
- Healing: the implants and tissues are allowed to heal. The exact period varies by case.
- Final bridge: new records are taken after healing. The final bridge is tried, adjusted and fitted.
- Maintenance: cleaning, gum checks, bite reviews and repairs continue over the long term.
“Teeth in a day” usually refers to provisional teeth, not the final bridge. Ask the clinic to state this clearly in writing. A short trip can be convenient, but the biological timeline should determine the calendar.
Send your case for review. We can outline likely stages, travel needs and which parts remain conditional on examination.
Costs: compare the complete plan
All-on-6 commonly costs more because it uses two additional implants and components. However, a useful comparison must include the whole treatment: scans, extractions, grafting, temporary teeth, implant components, the final bridge, sedation if used, night guard, follow-up and possible return travel.
A very low headline price can become expensive if key components are excluded. Read our guide to hidden costs in cheap dental implant quotes before comparing packages.
Risks and red flags
Implant treatment involves risks such as infection, delayed healing, implant failure, nerve or sinus complications, gum inflammation, bone loss, screw loosening, bridge fracture, wear and hygiene difficulty. Smoking and uncontrolled medical conditions may increase risk. No clinic can remove these risks or guarantee an implant for life.
Be cautious when a provider:
- recommends extraction of all remaining teeth without explaining their prognosis;
- confirms All-on-4 or All-on-6 from a smile photo alone;
- promises final teeth during one short trip before CBCT and examination;
- does not name the implant system or final bridge material;
- cannot explain what happens if an implant does not integrate;
- has no written maintenance or aftercare plan;
- uses “lifetime guarantee” language without clear conditions.
Aftercare is part of the treatment
A fixed full-arch bridge still needs daily cleaning underneath. Patients may need floss threaders, interdental brushes or a water irrigator, depending on the design. Professional hygiene and clinical reviews are essential. The bite and bridge screws may also need periodic checks.
Contact the clinic if you notice movement, a change in bite, persistent bleeding, swelling, bad taste or difficulty cleaning. Seek urgent local care for spreading swelling, fever, uncontrolled bleeding, severe worsening pain or breathing or swallowing difficulty.
A realistic example
Consider two patients with similar-looking missing teeth. One has adequate front bone, limited posterior bone and moderate bite forces. A four-implant design may avoid extra grafting and provide a suitable prosthetic plan. The other has good bone across the arch, strong bite forces and enough restorative space. Six implants may improve distribution. The visible problem looks similar, but anatomy and function change the answer.
Questions to ask before accepting a plan
- Which teeth, if any, can be preserved?
- Why are four or six implants recommended for my jaw?
- Which findings on CBCT support that decision?
- Are my immediate teeth temporary or final?
- What implant system and bridge material will be used?
- What is included, excluded and conditional in the quote?
- How will I clean the bridge?
- What happens if one implant fails?
- Who provides follow-up after I return home?
FAQ
Is All-on-6 always stronger than All-on-4?
No. Six implants can provide additional support in suitable anatomy, but position, bone quality, bite, bridge design and maintenance all affect the result. Poorly placed extra implants do not automatically improve a plan.
Can I have permanent teeth immediately?
Some patients may receive a fixed temporary bridge soon after surgery. The final bridge is usually made after healing and tissue changes. Immediate loading depends on implant stability and individual risk.
Can All-on-4 be used in both jaws?
It can be considered for either jaw, but the upper and lower jaws have different bone and force patterns. Each jaw needs separate assessment.
How many trips to Istanbul are needed?
Many full-arch cases require at least a surgical visit and a later final-restoration visit. Extra visits may be needed for grafting, healing problems or adjustments. Your written plan should state the expected stages.
Sources and further reading
- International consensus on full-arch implant rehabilitation
- Systematic review comparing All-on-4 and All-on-6 outcomes
- NHS patient information on dental implants and aftercare
Get a free consultation for a case-specific explanation of your options. We also help coordinate travel and accommodation after the treatment stages are clear.
Medical disclaimer
This article is educational and is not a diagnosis or personal treatment plan. Final advice requires examination, appropriate imaging, medical review and assessment by a qualified dentist.