Quick answer
All-on-4 supports a full-arch fixed restoration with four implants, while All-on-6 uses six. Six implants may provide a broader distribution of support in selected patients, while a four-implant plan can be an efficient full-arch solution when anatomy and prosthetic design are suitable. Clinical evidence indicates that both approaches can achieve high implant and prosthesis survival in appropriately selected cases. More implants are not automatically better, and four implants are not automatically sufficient for every patient.
What is All-on-4?
All-on-4 uses four implants in one jaw to support a fixed full-arch restoration. In many protocols the anterior implants are placed more vertically and the posterior implants may be angled to make efficient use of available bone and avoid anatomical structures. If adequate primary stability and other clinical criteria are achieved, an early or same-day provisional fixed bridge may be possible. This is not guaranteed for every patient.
In selected cases, this approach can reduce the need for bone grafting or sinus procedures, especially when posterior bone is limited. It should not be interpreted as a universally graft-free solution.
What is All-on-6?
All-on-6 uses six implants to support a fixed full-arch restoration. When the bone anatomy allows appropriate positioning, two additional implants may increase the number of support points and distribute forces over a wider area. The plan still depends on having sufficient bone, suitable implant positions and a prosthesis that can be cleaned effectively.
The clinical difference is therefore not simply “two more implants.” Implant position, anteroposterior spread, cantilever length, bite design and framework material can be as important as implant count.
Main differences between All-on-4 and All-on-6
• Number of implants: four per arch for All-on-4 and six per arch for All-on-6.
• Force distribution: six well-positioned implants may spread load across more support points. With four implants, implant angulation and distribution become especially important.
• Bone requirements: All-on-4 may be considered in some patients with limited posterior bone. All-on-6 generally requires more usable implant sites.
• Surgical scope: six implants can mean more components and surgical sites, although anatomical complexity matters more than the number alone.
• Cost: All-on-6 is often more expensive because of two additional implants and components, but the total depends on grafting, implant system, provisional teeth and final prosthetic material.
• Maintenance: both require long-term hygiene, professional maintenance and monitoring of the implants and prosthesis.
Is All-on-6 stronger or more successful?
It is not accurate to judge long-term success by implant count alone. Current clinical research has reported comparable implant and prosthesis survival for full-arch restorations supported by four or six implants in properly selected patients. Some studies have identified differences in technical complications, but these outcomes are influenced by prosthetic design, material, implant position, bruxism, bite forces and follow-up care.
The goal is not to place the highest possible number of implants. It is to create a biologically sound, mechanically stable and maintainable restoration for the individual patient.
Who may be considered for All-on-4?
People who have lost most or all teeth in an arch, or whose remaining teeth have a poor long-term prognosis, may be assessed for fixed full-arch implant treatment. All-on-4 may be considered when the available bone can support four implants in appropriate positions and when the surgical and prosthetic plan fits the concept, including some cases with posterior anatomical limitations.
Who may be considered for All-on-6?
All-on-6 may be considered when there is sufficient bone volume and distribution for six appropriately positioned implants and when a wider support base may be useful. Bone quality, arch length, bite forces, opposing teeth and final prosthetic design all influence the decision. The fact that six implants can be placed does not mean six are always necessary.
How is the decision made?
A reliable plan requires a clinical examination and three-dimensional imaging. CBCT is used to assess bone height and width, sinus anatomy, nerve canals and possible implant sites. Gum health, bite, bruxism, smoking, diabetes control, medications and the patient’s ability to maintain oral hygiene should also be considered.
Full-arch treatment should be prosthetically driven. Implant positions are planned around the intended final teeth so that the bridge can be functional, aesthetic and cleanable.
Can fixed teeth be placed on the same day?
Selected patients may receive a provisional fixed bridge on the day of surgery or during the early healing period when implant stability, bone quality, bite and other clinical conditions are suitable. The provisional bridge is not the final restoration. The definitive prosthesis is usually planned after healing and osseointegration. Immediate loading is a clinical decision, not a standard promise.
Will bone grafting or a sinus lift be needed?
One objective of four-implant full-arch concepts is to use available bone efficiently and, in some patients, reduce the need for additional grafting. Significant bone loss, sinus anatomy, aesthetic requirements or inability to place implants safely may still make grafting necessary. All-on-6 can also require grafting or sinus procedures if ideal implant sites do not have sufficient bone.
Why does the cost differ?
The total treatment cost should not be calculated from implant count alone. Diagnostic imaging, extractions, implants and abutments, provisional restoration, final bridge material, anaesthesia or sedation, bone grafting, sinus procedures, laboratory work and follow-up can all affect the final budget. A written, itemised treatment plan is more useful than comparing headline package prices.
Planning All-on-4 or All-on-6 in Türkiye
International patients considering full-arch implant treatment in Türkiye should look beyond price. Important factors include the clinician’s experience, facility credentials, implant system, prosthetic material, sterilisation standards, written treatment plan, aftercare arrangements and the process for obtaining help after returning home.
Clinicly can help coordinate pre-assessment using available scans, photographs and health information, facilitate communication with suitable hospitals or clinics, and organise treatment, accommodation, transfers and follow-up. Final diagnosis and treatment selection remain the responsibility of the treating dental team after examination.
Risks and long-term maintenance
Possible complications include infection, failure of osseointegration, temporary or persistent sensory changes, swelling, bleeding, screw loosening, prosthetic wear or fracture and peri-implant disease. Smoking, uncontrolled diabetes, poor oral hygiene and missed maintenance visits may increase risk.
A fixed full-arch bridge is not maintenance-free. Daily cleaning under and around the bridge, professional hygiene visits and regular clinical checks are central to long-term function.
Frequently asked questions
• Is All-on-6 always better than All-on-4? No. Two extra implants may be useful in selected cases, but the best plan depends on anatomy, implant distribution, bite forces and prosthetic design.
• Is All-on-4 always cheaper? It may have a lower initial cost because fewer implants are used, but total cost depends on grafting, materials and the complexity of treatment.
• Does All-on-4 eliminate the need for bone grafting? No. It can reduce grafting in some cases, but graft-free treatment is not possible for everyone.
• Does All-on-6 provide more chewing power? It may provide a broader support base in suitable patients, but chewing performance depends on the full prosthetic and occlusal design, not implant count alone.
• Can both treatments provide same-day teeth? Selected patients may be eligible for an immediate provisional bridge if adequate implant stability and other clinical criteria are achieved.
• Which option is right for me? A dependable answer requires examination, CBCT imaging and a prosthetically driven treatment plan.
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Conclusion
The most visible difference between All-on-4 and All-on-6 is the number of implants, but the right choice is more complex. Bone anatomy, implant position, prosthetic design, bite forces, hygiene, medical history and long-term maintenance all matter. In appropriately selected patients, both approaches can be effective options for fixed full-arch rehabilitation. Clinicly aims to make evaluation, provider selection and medical travel coordination in Türkiye clearer and more structured, while the final treatment decision must be made by the treating dental professional after clinical examination and imaging.
