If you’re looking at full-arch dental implants, you’ve probably run into two options: All-on-4 and All-on-6. The names sound similar. The end result looks similar. But the difference in cost, candidacy requirements, and long-term stability is significant enough that picking the wrong one can mean revision surgery down the road.
Here’s the honest breakdown.
What Is All-on-4?
All-on-4 is a full-arch implant system that supports a complete prosthetic arch using exactly four implants per jaw. Two implants go in vertically at the front of the arch, and two go in at an angle (typically 30 to 45 degrees) toward the back. That angled placement is the key innovation: it distributes bite force across a wider footprint and lets surgeons avoid the posterior region where bone loss is most common.
Nobel Biocare introduced this system, and it became the dominant technique for full-mouth restoration in patients with moderate to severe bone resorption. The angle placement means many patients who previously needed extensive bone grafting can now get implants placed without it.
Four implants supporting 10 to 14 teeth sounds like a lot to ask. It is. The prosthetic design and implant positioning have to be precise, and the long-term success depends heavily on osseointegration quality and occlusal load management.
What Is All-on-6?
All-on-6 uses six implants per arch instead of four, all placed vertically. The two additional implants go in the premolar region, creating a broader support base across the arch. There’s no angled posterior placement.
The trade-off: you need more bone volume to place six vertical implants, so this approach typically requires patients with better bone density or those who have already completed bone grafting. But the payoff is a more stable platform, especially for patients who grind their teeth or need heavier chewing support in the posterior.
Six-implant systems also tend to have slightly better load distribution per implant, which can matter over a 20-year horizon.
Side-by-Side Comparison
| Feature | All-on-4 | All-on-6 |
|---|---|---|
| Implants per arch | 4 | 6 |
| Implant placement | 2 vertical, 2 angled | 6 vertical |
| Avg. cost per arch | $20,000 to $30,000 | $24,000 to $35,000 |
| Bone graft required | Rarely | Sometimes |
| Best candidacy | Moderate-severe bone loss | Adequate bone volume |
| Durability (prosthetic) | High | Very high |
| Typical prosthetic material | Acrylic or zirconia | Acrylic or zirconia |
| Immediate loading | Yes (same-day teeth) | Yes (same-day teeth) |
| Revision complexity | Moderate | Moderate |
Cost Breakdown
All-on-4 dental implants typically run $20,000 to $30,000 per arch in the United States. All-on-6 implants cost a bit more: $24,000 to $35,000 per arch. Full-mouth (upper and lower) cases double those numbers, putting most patients in the $40,000 to $70,000 range depending on the approach.
What drives that cost? It’s not just the extra implants. The surgical complexity, the prosthetic lab fabrication, anesthesia, imaging (cone-beam CT), and your surgeon’s credentials all factor in. A board-certified oral and maxillofacial surgeon in a major metro market charges more than a general dentist with implant training in a rural area. That price difference is real, and it reflects real differences in skill and overhead.
Don’t fixate on the implant count as the cost driver. The prosthetic arch itself (the teeth you actually see) often costs as much as the surgical phase. Zirconia arches run $5,000 to $10,000 more than acrylic, but they’re worth it for most patients who plan to keep them 15+ years.
For a deeper look at what drives implant pricing, see our guide on how much dental implants cost.
Acrylic vs. Zirconia: The Material Decision
Both All-on-4 and All-on-6 cases can use either acrylic (PMMA) or zirconia prosthetics. This choice matters more than most patients realize.
Acrylic (PMMA): Lower upfront cost, easier to repair chairside, better for patients who want to evaluate fit before committing to a permanent restoration. The downside: acrylic wears faster, stains over time, and doesn’t have the fracture resistance of zirconia. Most acrylic arches need replacement or significant repair within 5 to 7 years.
Zirconia: Harder, more stain-resistant, and visually superior. Milled zirconia or layered zirconia bridges look closer to natural teeth and hold up better under heavy occlusal loads. The catch: if a zirconia arch chips or cracks, it usually requires full replacement rather than a simple repair. And the initial cost is higher.
For younger patients (under 60) or anyone who expects to get 20 years out of their restoration, zirconia is the better long-term investment. For older patients or those who want flexibility, acrylic is a reasonable starting point, especially as a provisional restoration while osseointegration completes.
Who Is a Better Candidate for Each?
This is where the real decision happens.
All-on-4 is the better fit if you:
- Have significant bone loss in the posterior maxilla or mandible
- Want to avoid bone grafting procedures
- Are looking for the lower end of the cost range
- Have otherwise healthy remaining bone in the anterior region
- Don’t have severe bruxism (grinding)
All-on-6 is the better fit if you:
- Have adequate bone volume throughout the arch
- Have a history of bruxism or heavy occlusal forces
- Want maximum long-term stability from the prosthetic
- Are willing to undergo bone grafting if needed
- Are prioritizing durability over minimizing cost
The honest answer is that most patients don’t self-select their candidacy. A cone-beam CT scan and a thorough consultation with an oral surgeon will determine which approach is actually viable for your anatomy. The surgeon may tell you that four implants are plenty, or they may tell you that your bone density and arch width require six. Trust the imaging over the marketing.
Maintenance: What You’re Signing Up For
Both systems require the same core maintenance regimen: water flossing (a Waterpik is nearly mandatory), soft-bristle brushes or specialized implant brushes, and professional cleanings every 3 to 6 months. The prosthetic screws require periodic torque checks, and most surgeons schedule a screw-tightening appointment at the 1-year mark.
The difference is in how the systems respond to mechanical failure. A single failed implant in an All-on-4 case is a bigger problem than in an All-on-6 case, simply because you’re losing 25% of your support structure instead of 16%. All-on-6 has a bit more redundancy built in.
Neither system is zero-maintenance. Patients who expect “set it and forget it” are setting themselves up for premature prosthetic failure.
For context on types of dental implants and how full-arch systems compare to other implant options, that guide covers the full landscape.
The Mexico and International Cost Factor
A growing number of U.S. patients are getting All-on-4 and All-on-6 work done in Mexico (Tijuana, Los Cabos, Cancun), Colombia, and Costa Rica, where costs can be 50 to 70% lower. All-on-4 cases that run $25,000 per arch domestically often run $8,000 to $12,000 abroad with board-certified surgeons and the same implant brands (Straumann, Nobel Biocare, Zimmer Biomet).
This isn’t a fringe trend. Dental tourism for implants is now a mainstream option, and for full-mouth cases where costs easily hit $50,000 to $70,000 in the U.S., the savings justify the logistics for many patients.
The risks are real too: managing complications from abroad is harder, and not all international providers use the same implant brands or quality controls. Research the provider, verify credentials, and understand the follow-up care plan before committing.
Frequently Asked Questions
Is All-on-4 or All-on-6 more durable?
All-on-6 has a slight edge in long-term stability because the additional implants distribute bite force across a broader base. That said, properly placed All-on-4 restorations have decades of clinical data supporting their durability. For most patients, the difference is less about implant count and more about prosthetic quality, bone integration, and maintenance compliance.
Can I upgrade from All-on-4 to All-on-6 later?
Technically yes, but it’s not a simple upgrade. Adding implants to an existing arch requires additional surgery, and the new implants need to integrate before you can modify the prosthetic. Most surgeons would rather plan for six implants from the start if the anatomy supports it than attempt a retrofit later.
How long do All-on-4 and All-on-6 implants last?
The titanium implants themselves can last a lifetime if they integrate properly and you maintain good oral hygiene. The prosthetic arch is a separate matter: acrylic arches typically last 5 to 10 years before needing replacement, while zirconia arches can last 15 to 20 years or more. Budget for prosthetic replacement when you’re projecting total lifetime cost.
Do I need bone grafting for All-on-6?
Not always, but more often than with All-on-4. The vertical implant placement used in All-on-6 requires adequate bone height and width throughout the arch, which some patients don’t have after years of wearing dentures. Your surgeon will assess this with a CT scan before quoting a treatment plan.
Does insurance cover All-on-4 or All-on-6?
Most dental insurance plans don’t cover implants, and full-arch restoration is almost never covered. Some medical insurance plans will cover implants if tooth loss is connected to a covered medical condition, but this is the exception. Financing through CareCredit, Proceed Finance, or in-office payment plans is how most patients manage the cost.
Ready to Find the Right Provider?
The difference between a great outcome and a painful revision often comes down to provider selection, not just which system you choose. ElectiveCareGuide matches patients with vetted dental implant specialists based on procedure type, location, and budget.
Find a dental implant specialist near you and get matched with providers who offer free consultations for All-on-4 and All-on-6 cases.