If you have already reached the point of discussing a fixed full-arch implant bridge, you may hear two terms: All-on-4 and All-on-6. Both use implants to support an entire arch of teeth. The fixture count changes how forces are distributed, how much bone is needed, and how the final bridge is planned.
This is a fixture-planning guide. If you are still deciding between removable dentures, implant-retained dentures, and fixed implant bridges, start with our broader missing teeth guide.
How All-on-4 Works
All-on-4 uses four implants per arch. A common concept places anterior fixtures more vertically and posterior fixtures at an angle, but the angles and positions are anatomy-led. This may use available bone and reduce grafting in selected cases; it does not remove that possibility for everyone.
The concept has a substantial published evidence base, but study results depend on selection criteria, follow-up, implant system, prosthetic design, maintenance, and how failures are defined. Population statistics are not a personal outcome forecast.
The fixed bridge is secured to the implants. Some clinically suitable patients may receive a provisional bridge soon after surgery; others need a different loading or healing plan. The final prosthetic stage follows clinical review of healing and integration rather than a guaranteed date.
For some denture wearers, a four-implant concept may be one fixed option to assess. Removable overdentures, a different implant count, conventional dentures, grafting, or no implant treatment may be more appropriate depending on anatomy, health, goals, and budget.
How All-on-6 Differs
All-on-6 adds two more implants per arch, for a total of six. The extra implants are usually placed in the premolar region.
The additional support points distribute biting forces across more fixtures. This can be beneficial in patients with a strong bite, those who grind, or cases where the bone quality in certain areas is softer.
Some clinicians prefer six implants for the upper jaw specifically, because upper jaw bone tends to be less dense than the lower jaw. The extra fixtures provide a wider base of support, which may reduce stress on each individual implant.
An additional fixture count changes the surgical and restorative plan, but it does not translate into a reliable public time estimate. Complexity and appointment length depend on anatomy, extractions, grafting, guidance, access, and the provisional plan.
Bone Requirements and Grafting
One reason angled posterior implants are considered is to use available bone and, in selected upper-jaw cases, reduce the need for a sinus procedure. Only imaging and clinical planning can establish whether this is feasible and safe.
All-on-6 may require more bone volume because of the additional implant sites. If your bone is thin in the premolar region, grafting or a sinus lift might be needed before or during placement.
Clinical examination and 3D imaging, where indicated, help the treating team assess bone volume and nearby anatomy. Those findings, rather than a general preference for four or six implants, guide the recommendation.
Cost Comparison in Brisbane
Full arch implant treatment is a significant investment, and fees vary with the provider, surgical plan, implant number, provisional teeth, final bridge, materials, preparatory care, and maintenance requirements.
Ask for an itemised written quote that identifies the planned components, exclusions, materials, stages, review arrangements, and likely future maintenance costs. A headline package price is not enough to compare two clinically different plans.
Longevity and Maintenance
Both concepts are intended for ongoing use, but neither fixture count guarantees survival or avoids future repair. Ask which evidence is relevant to the proposed implant system, arch, prosthesis, and your risk factors.
The bridge and its components wear differently from the implants. Repair, relining, screw replacement, refurbishment, or replacement may be needed at an unpredictable point depending on materials, bite, complications, and maintenance.
Maintenance matters. Your clinician will set a review and professional-cleaning interval based on risk and teach you how to clean under the bridge. Poor plaque control increases the risk of peri-implant disease, but maintenance does not eliminate all biological or mechanical complications.
How the approach is chosen
Implant number is not selected from a package menu. The treating team considers the clinical examination, 3D imaging where indicated, bone distribution, bite forces, medical risk, hygiene access, prosthetic space, and the proposed bridge.
A four-implant concept may be considered in some anatomies, while six implants or another design may be preferred in others. A clinically appropriate plan may also use a fixture count outside the two branded labels.
Complex fixed full-arch cases require coordinated surgical and restorative planning. Depending on the case and the clinicians involved, referral to or coordination with an appropriately experienced implant team may be recommended.
Questions to Ask at Your Consultation
Before committing to full arch implant treatment, ask your clinician:
- How many implants does my bone support, and why?
- Will I need grafting or a sinus lift?
- What material will the final bridge be made from?
- What does the warranty cover, and what are the conditions?
- What happens if an implant does not integrate?
A thorough implant consultation should answer all five clearly. If you are getting a recommendation for four or six without a 3D scan, consider a second opinion.
Next Steps
Full-arch implants may improve function or denture stability for suitable patients, but they involve surgery, maintenance, cost, and possible complications. The fixture count is a clinical and restorative decision, not a promise attached to a brand label.
Ivy Dental can assess your oral health and discuss missing-tooth options. Complex fixed full-arch cases may need referral to, or coordinated care with, an appropriately experienced implant team. Learn more about the general implant consultation pathway.
